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2019 Flood Season Summary

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Select desired 'Date' to see corresponding 24-hour rainfall map ending at 7AM the following day.

 

 

 

 

 

 

 

 

> 0.6" RADAR ESTIMATE OR 0.5" GAUGED IN FORECAST AREA

Event

Date

Max ALERT

Max CoCoRaHS

QPE STP

ALERT

Alarms

ALERT

Rain

Alarms

Note

ADAM

ARAP

AURA

BLDR

BROM

DENV

DOUG

JEFF

1
0.63"
0.75"
>1.08"
Moderate HPO issued at 1004. M1 issued for Adams County 1854. M1 issued for the remainder of the District at 2011. A cold front moved in during the pre-dawn hours. Showers and thunderstorms started in early afternoon. Starting around 1700 a thunderstorm producing showers and hail tracked along the Jefferson/Boulder County line and moved across Adams County. Storms continued to occur in the District until 2200.
X
X
X
X
X

X
X
2
0.75"
0.96"
>0.94"
Moderate HPO issued at 1050. M1 issued for the entire District at 1137. Low pressure and an upper level disturbance moved into the District in the late morning. Storms developed in the foothills between 1130 and 1300 and moved across the District. A second round occurred between 1300 and 1800 producing moderate rainfall and continued overnight.  Rainfall reports and alarms for station 600 are likely erroneous.
X
X


X
X
X
3
0.20"
0.31"
>1.10"
Low HPO issued at 0946. M1 issued for the entire District at 1139. An upper level disturbance moved into the District setting the stage for strong storm potential. Storms developed NW of the District at 1000.  Multiple waves of showers and weak thunderstorms moved into the District in the afternoon and early eventing but the strongest storms that developed were north into Larimer and Weld Counties.
X

X
X


X
4
0.71"
0.79"
>2.56"
Moderate HPO issued at 1028. M1 issued at 1532 for the entire District. Conditions were favorable for strong to severe thunderstorms.  A tornado watch was posted for Adams, Arapahoe and Denver counties. Showers and thunderstorms began to develop at 1500 producing a wave of storms. Another round of storms developed at 1700. Strong to severe storms tracked NE across the District. Another round of storms developed at 2100 producing heavy rainfall and hail over the SE portions of the District.
X
X
X
X
X
X
X
5
0.87"
1.10"
>2.76"
Moderate HPO issued at 1006. M1 issued at 1234 for the entire District. For the second straight day, wind and moisture profiles were favorable for strong to severe thunderstorms, prompting issuance of an NWS Tornado Watch for Adams, Arapahoe, and Denver Counties until 2100. Showers were slow to develop util a strong cell formed SE of DIA at 1300. Additional light to moderare thunderstorms tracked across the District at 1800.  
X
X
X
X
X
X

X
6
0.63"
0.60"
>1.17"
Low HPO issued at 1008. M1 issued at 1442 for the entire District. A trough of low pressure was centered over Colorado. Showers were quick to develop at 1200 but were weak and short-lived. A final wave of storms arrived from the N at 0100 in the morning producing brief, moderate rainfall.
X

X
X
X
7
0.91"
1.31"
>1.85"
Moderate HPO issued at 1004 for Adams, Arapahoe, Denver, Douglas and low HPO for rest of District. M1 issued at 1303 for the entire District. A low over S California and a weak cold front from NE Colorado increased moisture across the District producing a strong wave of showers and thunderstorms in the afternoon. Storms developed over N Jefferson at 1300 moving ESE over the District producing moderate to heavy rainfall, large hail and strong winds. The strongest storm in SE Denver and west central Arapahe produced hail up to 1.75" in diameter and 2" of hail accumulation.
X
X
X
X
X
X
8
0.35"
0.52"
>1.20"
High HPO issued at 1023 for the entire District. M1 issued for the entire District at 1156. An upper level low and high instability resulted in an elevated threat for severe thunderstorms across the District. Thunderstorms developed before noon in Boulder and Jefferson foothills. Storm development west of the District spread cloud cover over the District reducing surface heating. Numerous storms developed over the District between 1300-1530 but were weaker than expected, only producing light to moderate rainfall and no severe weather.
X
X
X
X
X
X

X
9
0.71"
0.74"
>2.44"
Moderate HPO issued at 937. M1 issued for the entire District at 1337. Weak thunderstorms developed at mid-day but most rain fell as virga. As these storms moved eastward, a gust front developed triggering strong storms inside the District. Storms also developed in the foothills and moved into the District. Storm development ended with the loss of daytime heating.
X
X
X
X
X
X
10
0.43"
0.67"
>1.37"
Moderate HPO issued at 1035. M1 issued for the entire District at 1256. Storms developed over the foothills at 1300. Two rounds of thunderstorms moved across the District. Storm activity ended by 1800.
X
X
X
X
X
X
X
11
0.28"
0.59"
>1.57"
HPO issued at 0943 indicating NONE. Low HPO issued at 1544. M1 issued for the entire District at 1556. A back-door cold front moved into the region bringing E/NE winds and low-level moisture. Storms developed at the plains/foothills interface. Storms developed in Boulder County at 1500 with cold air aloft producing large hail. These storms produced a gust front that initiated storm development to the South, producing more large hail. A cluster of super cell storms moved to the SE and a land spout tornado occurred over Elbert County. Storms pushed E after 1900. Storms were observed to "split" with one piece moving NE with the other moving SE resulting in linear patterns on the rain distribution map.
X
X
X
X
X
X
X
X
12
0.43"
0.55"
>1.15"
Moderate HPO issued at 1017. M1 issued for the entire District at 1448. A weak disturbance from the 4-Corners region caused an increase in thunderstorm activity. Storms developed over S Jefferson and Palmer Divide in the early afternoon. An outflow boundary pushed N into the District in mid afternoon producing short storms with moderate to heavy brief rainfall. Storm activity ended by 2100.
X
X
X
X

X
X
13
0.87"
1.06"
>2.03"
Moderate HPO issued at 1006. M1 issued for the entire District at 1353. An active upper level pattern produced multiple rounds of storms across the District. Storms developed over the foothills at midday producing strong storms over Douglas County, The next round of storms moved into Jefferson County and strengthened as they moved W to E across the District. Another round of storms developed over NW portions of the District at 2100 tracking E/SE before exiting the District at 2300. Storms weakened at 2300.
X
X
X
X

X
X
X
14
1.46"
1.48"
>2.10"
Moderate HPO issued at 0949. M1 issued for the entire District at 1156. Low pressure moved across Colorado causing storms to develop over the foothills in late morning moving into the District by 1500. Areas W of Boulder and Four Mile burn were impacted and alarms were issued. Additional thunderstorms developed in Douglas County moving NE in N Douglas and Arapahe Counties triggering rainfall alarms. NWS flash flood warning was issued for Arapahoe Country and southern Aurora. Storms began to weaken by 1700.
X
X
X
X
X
X
X
X
15
0.87"
1.20"
>1.79"
High HPO issued at 0947. M1 issued at 1036 for the entire District. An active pattern continued across Colorado. Morning clouds broke by mid-morning. Showers and storms developed over the mountains and foothills by noon. Storms entered the District at 1100. An embedded stronger storm impacted N central Douglas from 1130-1230. At 1300 a strong storm formed over W Adams County.  A cluster of storms pushed into the District from the N impacting Adams, Arapahoe and DIA until 1800. Isolated showers persisted until 2200.
X
X
X
X
X
X
X
16
0.31"
0.74"
>1.20"
Low HPO issued at 1001. M1 issued for all areas 1455. A weak disturbance ahead of an unseasonably strong and cold upper level trough triggered isolated storms over the District. Weak thunderstorms initiated over the foothills by 1400. By 1430-1500 storms blossomed over the E District and DIA. Several storms merged causing a severe cell with large hail exiting the District by 1600. The strongest storm of the day did not pass over any gages or CoCoRaHS stations in rural eastern areas of the District.
X
X
X
X
17
1.93"
1.94"
>2.21"
Moderate HPO issued at 0959. M1 issued for Adams, Arapahoe, Aurora, Denver, DIA and Douglas at 1411. An unseasonably cold upper level trough moved into Colorado. Moisture increased during the day causing rain showers to develop in the District around noon. Storms developed over Douglas County at 1300 with training storms strengthening between 1400-1500. Showers and storms impacted the S, central and E portions of the District between 1500-2100.
X
X
X
X
X
X
X
X
18
1.61"
1.42"
>1.43"
Low HPO issued at 1008.  M1 issued for the entire District at 1329. An unseasonably cold upper-level trough stalled over western Colorado. Thunderstorm activity started to develop over SW portions of the District by 1400 moving NE. Light to moderate showers and storms would continue over the District in the afternoon and early evening. A second surge of moisture produced moderate to heavy rainfall in N Douglas and W Arapahoe Counties around 1800. Storms decreased about 2200.
X
X
X
X
X
19
0.91"
1.83"
>2.46"
Moderate HPO issued at 0952. M1 issued for entire District at 1330. High pressure with elevated temperatures and elevated surface moisture caused stationary storm development. Initial storms formed just west of Boulder over the Four Mile burn area. Other storms developed in central Douglas county foothills and pushed to the southern District boundary. These storms produced nearly 2" per hour rainfall.
X
X
X
X
X
X
X
20
2.13"
1.73"
>3.55"
Moderate HPO issued at 1009. M1 issued for the entire District at 1251. High pressure over Texas caused upper-level moisure to stream N over Colorado. Showers and storms developed over the Palmer Divide and Cheyenne Ridge at 1200 expanding to Douglas and Jefferson Counties by 1400. Storms strengthened as they built into the District over the next 1-2 hours. Additional storms developed over Boulder County through roughly 2000. By 2400 storms had moved E of the District.
X
X
X
X
X
X
X
X
21
0.98"
0.86"
>1.67"
High HPO issued at 1040. M1 issued for the entire District at 1328 until 2200. Significant moisture remained in place across the District. Storms formed over higher terrain W of the District 1130-1330. These storms remained nearly stationary. Outflow from the foothills storms resulted in storm development across Adams and E Douglas Counties at 1430. These storms were very slow moving causing locally heavy rainfall. Storms diminished after 1700.
X
X
X
X
X
X
22
0.75"
0.84"
>3.04"
Moderate HPO issued at 1032. M1 issued for the entire District at 1531 until 2200. Southwest upper level flow dominated the region. Storms initiated by 1500 in S Douglas County and severe storms entered the District at 1700. With cold air aloft, strong to severe storms produced abundant hail (>1" diameter), which limited rainfall rates. As storms moved N and E out of the District several outflow boundaries created new storm developments producing mostly hail. By 1900 scattered showers occurred and storms would start to weaken after midnight.
X
X
X
X
X
X
X
X
23
2.05"
1.61"
>3.69"
Moderate HPO issued at 0955. M1 issued for the entire District at 1435. Very moist and unstable conditions were in place over the District. Storms developed over the foothills and Palmer Divide at 1200 but a capping inversion suppressed storm development during the afternoon. At 1800 the cap eroded over the District and a severe storm developed over Denver and Aurora. This formed into a cluster of stationary storms producing large hail and heavy rainfall. At 1900 this cluster of storms built northward into W Adams, N Jefferson, Broomfield and Boulder Counties producing large hail and heavy rainfall. After 2000 this cluster slowly moved N out of the District.
X
X
X
X
X
X
X
X
24
0.35"
0.28"
>1.59"
High HPO issued at 958. M1 issued for the Entire District at 1105. Moist SW flow aloft remained in place over the Central Rockies. Storms initiated just W of the Jefferson County foothills at 1300 and exploded into Jefferson County by 1400. This early, rapid development caused temperature reductions across the District hindering most additional storm development for the day. Although some additional storms moved through Central Douglas County during the afternoon.
X
X
25
0.67"
1.00"
>2.91"
Low HPO issued at 0943. M1 for the entire District issued at 1440. Moisture that had been in place for several days was stubborn to mix out. Storms developed over the foothills 1100-1400 but did not reach lower elevations. A wind convergence boundary set up across SE portions of the District causing storms to develop at 1430 producing nearly stationary moderate storms. 
X
X
X
X
X
X
X
X
26
0.24"
0.29"
>0.75"
Low HPO issued at 0950 for Adams, Boulder, Broomfield and the Boulder, Jefferson and Douglas Country foothills with moderate for the rest of the District. M1 issued at 1149 for the entire district. Moist SW flow aloft remained in place with a few limiting factors as well. Storms developed over Jefferson County foothills at 1130 but dissipated. A second round formed but also dissipated. A third round formed at 1600 and moved into lower elevations of the Palmer Divide.
X
27
0.28"
0.43"
>2.02"
Low HPO issued at 922. M1 issued for all areas at 1425. High pressure to the SW moved moisture into NE Colorado. Storms developed over the foothills and Palmer Divide by early afternoon. Elbert Country storms sent a gust front/outflow boundary that moved into the District between 1400-1500. This boundary triggered stronger storms in the E side of the District until about 1800.
X
X
X
X
28
1.22"
1.45"
>2.76"
Moderate HPO issued at 1000. M1 issued at 1626 for the entire District. High pressure over New Mexico caused a plume of moisture to stream NE over Colorado. Storms formed over the foothills by 1400 but were slow to move E to lower elevations. By 1600, showers and weak storms moved to the plains of N Douglas County. Nearly stationary storms formed and reformed over central portions of the District. Storm activity began to weaken by 2200.
X
X
X
X
X
X
X
X
29
0.67"
0.46"
>0.67"
High HPO issued at 1039. M1 issued for the entire District at 1243. Deep moisture remained in place across the District. A subtle upper lever disturbance triggered an early round of storms across Jefferson foothills around 1200. Storms were slow moving and weakened as the entered the District between 1300-1500. Showers and storms were weak and scattered throughout the District before ending by 2230.
X
30
2.05"
1.03"
>2.10"
High HPO issued at 1026. M1 issued for all areas at 1401. High pressure to the SE pushed moisture into NE Colorado. High temperatures were also in place. Storms developed over higher terain and the Palmer Divide before 1200. Storms first developed over Jefferson County moving along I-70 and strengthening into Douglas County by 1600. Additional storms developed NW of the District in Boulder County between 1500-1800.
X
X
X
31
2.28"
1.61"
>2.99"
High HPO issued at 951. M1 issued for all areas at 1245. M3 issued at 1754 for Jefferson County, Arvada, Lakewood, Wheat Ridge. M3 issued 1814 for Adams and Denver Counties. The heat wave came to an end with a strong cold front moving though during the morning resulting in cooler temperatures and increasing moisture. The first wave of storms initiated in the foothills 1300-1400 with storms moving into the plains and the District between 1400-1600. A second round of storms resulted in M3 being issued with high rainfall rates. Lena Gulch and along 6th Avenue into Denver saw the strongest storms. The majority of rainfall exited the District by 2100.
X
X
X
X
X
X
X
32
1.61"
2.39"
>3.14"
Moderate HPO issued at 0948. M1 issued at 1716 for the entire District. M3 issued for Douglas County at 2126. Mid and upper level moisture was set to increase throughout the day. Storms developed over the mountains and higher foothills at 1200. Despite favorable conditions for storm development, the atmosphere remained capped for much of the afternoon and early evening. A strong cell hear Aurora Reservoir produced heavy rainfall and another near Sedalia prompted a flash flood warning. A line of storms formed over Boulder, Jefferson and Douglas County foothills at 2100 eventually becoming a single cell over SE Boulder County by 2200. Light to moderate rainfall impacted the District overnight.
X
X
X
X
X
X
X
33
1.42"
1.34"
>1.96"
High HPO issued at 957. M1 issued at 1641 for the entire District. Significant moisture remained in place. Storms developed over the foothills 1300-1600. Storms in Larimer and Weld Counties produced a gust front that moved S into the District. Two lines of strong storms developed between 1600-1645. These lines converged into a cluster of stationary storms 1700-1730 producing heavy rainfall, large hail and severe wind before weakening and exiting the District around 1900.
X
X
X
X
X
X
X
34
0.51"
0.79"
>1.45"
Moderate HPO issued at 0943. M1 issued for all areas at 1726. Hot and dry conditions persisted over the District. After 1700, a gust front from storms over northern Colorado pushed into the District. Widely scattered storms impacted the District through 1900-2000. Most storms produced gusty winds and brief but moderate rainfall. Stronger storms in SE areas of the District produced areas of heavy rain. Rainfall decreased after 2000.
X
X
X
X
35
0.94"
0.84"
>1.00"
Moderate HPO issued at 958. M1 issued for all areas at 1230. Sunny and hot conditions started the day. An upper level disturbance moved over the Denver area resulting in quick storm development along the W side of the District at 1200. Slow moving storms in NE Douglas County produced moderate to heavy rainfall. Additional storms developed NW of the District. Storms weakened and moved E SE by 1700.
X
X
X
36
0.79"
1.78"
>1.28"
High HPO issued at 922. M1 issued for all areas at 1315. An upper level low and a plume of subtropical monsoon moisture moved over the District. Storms developed over mountains and foothills W of the Distict before 1200. Storms pushed east over the Palmer Divide S of the District producing heavy rains at 1400. Widely scattered weak storms developed 1400-2000. Stronger storms developed NE and SE of the District.
X
X
X
X
X
37
1.38"
1.14"
>2.85"
Low HPO issued for Arapahoe, Denver, Douglas, Jefferson at 1120. None issued for Adams, Boulder, Broomfield. M1 issued for Jefferson, Douglas, Denver, Arapahoe including Aurora, Arvada, Wheat Ridge and Lakewood at 1323. Sunny and hot conditions persisted over the District. Storm activity began in the soutwestern portions of the District by 1330. Storms began strong but nearly stationary, then faster storms began moving off the foothills into central Douglas County producing moderate to heavy showers moving southward. Heavy rain in the District diminished by 1400.
X
X
38
0.47"
0.95"
>1.39"
Low HPO issued at 949. M1 issued for the entire District at 1818. Sunny and hot conditions persisted over the District. Some storm activity in the SW portion of the District in early afternoon but any storms moving eastward dissipated. Around 2000 a line of storms formed along western Adams County producing moderate rainfall then moved E NE out of the District. Storms ended by 2200.
X
X
X
X
X
X
39
1.02"
0.60"
>2.08"
High HPO issued at 922. M1 issued for all areas at 1141. Monsoon moisture and an upper level disturbance were in place and expected to produce showers and storms during the afternoon and evening. By noon storms developed over higher terrain in Boulder County. Between 1300-1400 strong storms began to initiate over the plains. Most of the strong storms remained near or outside District boundaries. Scattered activity continued into the evening. In general, rainfall was light dispite the favorable conditions for heavy rainfall.
X
X
X
X
X
X
40
0.51"
0.56"
>1.49"
Low HPO issued at 943. M1 issued for the entire District at 1851. Monsoonal moisture gradually increased across the District during the day. Storms initially developed over the foothills by early afternoon. A capping inversion limited storm activity on the plains for most of the day. A gust front from storms in N colorado moved into the District between 1800-1830. As the gust front reached higher terrain S of Denver, storms developed across Jefferson County. These storms produced moderate but brief rainfall before falling apart 1930-2000. A round of moderate storms developed over Boulder County 2030-2100. Weak storms moved across the District 2200-2300 before dissipating.
X
X
X
X
X
X
41
1.69"
3.30"
>3.57"
High HPO issued 1019. M1 issued at 1139 for the entire District. Storms developed over the mountains and foothills by noon. A strong line of storms extended from S Jefferson County to Limon producing heavy rainfall in the foothills and NE Douglas County. Between 1500-1700, weak storms developed inside the District. After 1700, storms developed outside the District.
X
X
X
X
X
X
X
42
0.63"
1.12"
>1.88"
Moderate HPO issued at 944. M1 issued at 1230 for the entire District. Storms initially developed over S Jefferson County foothills and N Douglas County. By 1300 these storms intensified as two distinct cells and moved SW to ENE producing high rain intensities. More widespread storms developed in the District by 1500.  Storms transitioned out of the District by 1700.
X
X
X
X
X
43
0.59"
0.14"
>0.89"
Low HPO issued at 1043. M1 issued for all areas at 1924. Conditions were quiet all day until storms rapidly began developing about 2100 N of the District in Larimer and N Boulder Counties. Two cells developed with one moving NE and another moving SE.  These cells became severe with heavy rainfall and large hail. The southern cell moved into the far NE portion of the District before weakening
X
X
X
X
44
0.24"
0.50"
>0.79"
Low HPO issued at 1330, updated to Moderate/High at 1729. M1 issued at 1831 for the entire District. Hot and dry conditions started the day resulting in no storm activity through mid-afternoon. A strong gust front from storms N and NE moved into the District at 1700. Strong, slow moving storms developed behind this front but storms remained weak over the District. The heaviest rainfall occurred E of the District.
X
X
X
X
X
45
1.89"
1.88"
>3.07"
High HPO issued at 1010. M1 issued for the entire District at 1625. M3 issued for Adams, Arapahoe, Denver, Jefferson including Aurora, Arvada, Wheat Ridge and Lakewood at 1846. A cold front dropped out of the northern plains resulting in cooler temperatures and cloud cover in the morning. Easterly winds and a plume of subtropical moisure resulted in several ingredients favoring heavy rainfall across the area. Storms initiated at 1300 over foothills of Teller and El Paso Counties. By 1600 storms formed over Larimer, Boulder and Jefferson foothills. Storms merged over Denver Metro at 1830 forming a large, severe-warned, nearly stationary cluster of storms.  This cluster produced heavy rainfall through 1930, diminishing by 2000. Storms with locally heavy rainfall developed over W Douglas around 2100, transitioning E of the District by 2200.
X
X
X
X
X
X
X
X
46
0.18"
0.32"
>1.46"
Low HPO issued at 946. M1 issued at 1350 for the Entire District, including Four Mile Burn area. Low level moisture and clouds remained in place following the previous active day. Conditions limited rapid heating but weak storms developed over the foothills around noon.  A gust front outflow boundary caused storm development over N Douglas. Quick, pulse-like storm cells developed causing only brief, locally heavy rainfall. Storms dimished by sunset.
X
X
X
47
2.72"
2.73"
>3.28"
Moderate to high HPO issued at 1001. M1 issued for all areas at 1344. M3 issued at 1605 for Arapahoe and Douglas Counties. A cold front moved into NE Colorado overnight producing clouds and rain showers in the morning. A strong upper level disturbance moved through in the afternoon causing numerous strong storms. Early storms developed at 1300 over the foothills. Between 1400-1500, a strong storm producing heavy rainfall and hail moved into the W side of the District in Jefferson County. This storm combined with another cell to produce heavy rainfall. Additional storms developed to produce heavy rainfall over Aurora and S of DIA, resulting in an M3 to be issued just after 1600. Storm activity weakened over the District after 1700. At 1800 another storm developed over the Four Mile Burn Area producing heavy rainfall, but only light rainfall over lower elevations.
X
X
X
X
X
X
X
X
48
0.87"
1.41"
>2.30"
High HPO issued at 1003. M1 issued for entire District at 1356. A cold front moved through the District overnight. A potent low pressure system moved through the region in the late afternoon producing moderate to severe storms over the District. Between 1600-1700 storms produced small hail, strong winds and brief moderate to heavy rainfall but moved quickly across the District. Another round of fast moving storms developed around 2300.
X
X
X
X
X
X
X
X

 

 

Maximum 24-hour value

Maximum 24-hour value

Maximum

Radar

estimated

24-hour

precip

Alarm Log

Rainfall

Rate Alarm

 

ADAM

ARAP

AURA

BLDR

BROM

DENV

DOUG

JEFF