Flash Flood Prediction Program - 2013 Summary

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2014 Season Summary

Meteorological support services for 2014 are provided by Genesis Weather Solutions and Skyview Weather.

Click on the date hyperlink to see gauge and radar derived precipitation estimates for each event.

 

 

 

 

 

 

 

 

> 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
0.28"
0.61"
>3.52"
   

Message 1 issued at 0608 for Arapahoe, Aurora, Adams and Denver.

A moderate thunderstorm developed and remained nearly stationary causing moderate rainfall on the eastern side of the District from just south of DIA into Adams and Arapahoe Counties. The heaviest rainfall occurred in rural areas on the eastern side of the District.

X
X
X
   
X
   
2
1.02"
0.86"
>2.29"

Table

Map

Message 1 issued at 1143 for the entire District. Waves of moderate, strong and severe thunderstorms moved through the District from SSW to NNE. Rain with embedded thunderstorms developed late at night and continued into the morning.

X
X
X
X
X
X
X
X
3
1.38"
1.11"
>2.96"

Table

Map

Message 1 issued for Boulder County, Jefferson County and Douglas County at 1322. Message 1 issued for the entire District at 1400. Rainfall alarms of 0.5 inches in 10 minutes and 1.00 inch per hour were exceeded in Aurora. Heavy rainfall was recorded on the plains.

X
X
X
   
X
 
X
4
1.38"
2.22"
>2.59"

Table

Map

Message 1 issued for Boulder, Jefferson and Douglas Counties at 1129. Message 1 issued for the remainder of the District at 1200. Rainfall alarms of 0.5 inches in 10 minutes and 1.00 inch per hour were exceeded in Aurora, Adams County and Brighton. Heavy rain was again recorded in the plains.

X
X
X
X
X
X
X
X
5
1.85"
1.50"
>2.20"

Table

Map

Message 1 issued for the entire District at 1134. Rainfall alarms of 0.5 inches in 10 minutes and 1.00 inch per hour were exceeded in Jefferson County, Adams County, Denver County, Brighton, Aurora and Arapahoe County.

X
X
X
   
X
X
X
6
1.65"
1.56"
>2.63"

Table

Map

Message 1 issued for the entire District at 1200. Rainfall alarms of 0.5 inches in 10 minutes and 1.00 inch per hour were exceeded in Boulder County, Douglas County and Denver County. Rainfall alarms of 0.25 inches in 10 minutes and 0.50 inches in 30 minutes were exceed in the Fourmile Burn area.

X
X
X
X
X
X
X
X
7
1.22"
1.65"
>1.85"

Table

Map

Message 2 issued for the entire District at 0951. Message 3 issued for Fourmile Burn area at 1925. Rainfall alarms of 0.5 inches in 10 minutes and 1.00 inch per hour were exceeded in Jefferson County.

 
X
 
X
 
X
X
X
8
0.98"
1.06"
>1.64"

Table

Map

Message 1 issued for Boulder, Jefferson and Douglas Counties at 1203. Message 1 issued for the entire District at 1300. No rainfall alarms recorded on this day.

     
X
 
X
X
X
9
0.91"
0.61"
>0.59"
   

Message 1 issued for Boulder, Jefferson and Douglas Counties at 1346. Rainfall alarms exceeding 0.5 inches in 30 minutes were exceeded in Boulder County in the Fourmile Burn area.

             
X
10
0.83"
0.71"
>1.39"
   

Message 1 issued for Douglas County, Arapahoe County and Aurora at 1435. Message 1 issued for Adams County at 1708. No rainfall alarms recorded on this day.

X
         
X
X
11
1.18"
1.59"
>1.52"

Table

Map

Message 2 issued for Boulder County, Jefferson County and Douglas County at 0859. Message 2 issued for the remainder of the District at 0908. District rainfall alarms exceeding 0.5 inches in 10 minutes and 1 inch in 1 hour were exceeded in Boulder County and Jefferson County. Rainfall alarms exceeding 0.25"/10 min and 0.5"/30 min were exceeded in the Boulder County Fourmile Burn area.

X
   
X
   
X
X
12
0.94"
0.29"
>1.38"

Table

Map

Message 1 issued for Boulder County, Jefferson County and Douglas County at 1315. Message 1 issued for the remainder of the District at 1415. No rainfall alarms recorded on this day.

           
X
 
13
0.87"
1.27"
>1.93"
   

Message 1 issued for the entire District at 1358. No rainfall alarms were recorded for this day.

X
X
X
   
X
X
X
14
0.35"
0.32"
>1.30"
   

Message 1 issued for the entire District at 1122. No rainfall alarms were recorded for this day.

           
X
X
15
2.17"
1.97"
>2.60"

Table

Map

Message 1 issued for the entire District at 1024. Rainfall alarms exceeding 1-inch/1-hr were recorded in Aurora, Arapahoe County and Douglas County.

X
X
X
X
X
X
X
X
16
0.08"
0.15"
>0.50"
   

Message 1 issued for Boulder County, Jefferson County, and Douglas County at 1344. No rainfall alarms were recorded for this day.

               
17
0.67"
0.76"
>1.35"
   

Message 1 issued for Adams County, Denver County, Arapahoe County and Aurora at 1527. Message 1 issued for Douglas County at 1617. No rainfall alarms were recorded for this day.

X
X
X
 
X
X
X
 
18
0.59"
0.64"
>1.50"
   

Message 1 issued for Adams, Denver, Arapahoe/Aurora, Jefferson and Douglas County at 1813. No rainfall alarms were recorded on this day.

X
   
X
X
X
X
X
19
0.47"
0.73"
>1.46"
   

Message 1 issued for Adams, Denver, Arapahoe/Aurora and Douglas County at 1430. 3 tornado warnings issued by NWS for Adams/Arapahoe counties at 1441-1545. No rainfall alarms were recorded on this day.

X
X
     
X
 
X
20
0.39"
0.42"
>1.20"

Table

Map

Message 1 issued for entire district at 1255. One rainfall alarm for 0.25" in 10 min in Boulder county was recorded on this day.

X
   
X
   
X
 
21
0.28"
0.51"
>1.51"

Table

Map

Message 1 issued for entire district at 1354. Two rainfall alarms were recorded on this day: Hayman 0.5" in 30 minutes and Plains 0.5" in 10 minutes.

X
X
X
   
X
X
X
22
0.91"
1.99"
>1.49"

Table

Map

Message 1 issued for Adams, Douglas and Arapahoe Counties and Aurora at 1929. Message 1 issued for Denver County and DIA at 1942. Heavy rainfall including rainfall alarms exceeding 0.5 inch/10 min were recorded in Arapahoe County.

X
X
X
   
X
X
 
23
0.35"
0.28"
>0.65"
   

Message 1 issued for the entire District at 1149. No rain alarms were recorded on this day.

           
X
 
24
0.47"
1.39"
>0.95"
   

Message 1 issued for Boulder, Jefferson, Broomfield, Adams and Denver Counties at 1242. Message 1 issued for Arapahoe County and the City of Aurora at 1304. No rain alarms were recorded on this day.

X
X
X
X
 
X
 
X
25
0.31"
0.34"
>0.94"
   

Message 1 issued for Boulder County and Fourmile Burn Area at 1659. No rain alarms were recorded on this day.

           
X
X
26
0.71"
1.08"
>1.43"

Table

Map

Message 1 issued for Boulder County, Broomfield, Adams County, Denver County and Jefferson County at 1342. Message 1 issued for Denver County to include DIA at 1352. Rainfall rate alarms exceeding 0.5 inches in 10 minutes were recorded for Jefferson County.

X
     
X
 
X
X
27
2.32"
2.22"
>3.03"

Table

Map

Message 1 issued for Arapahoe County and City of Aurora at 1909. Message 1 issued for Adams County at 1930. Message 1 issued for Boulder County at 1959. Message 1 issued for Broomfield and Jefferson County at 2012. Message 1 issued for Denver County and DIA at 2024. Message 1 issued for Douglas County at 2052. Message 3 issued for small portion of Arapahoe County near the eastern District boundary at 2120. Rainfall rate alarms exceeding 0.5 inches in 10 minutes and 1.0 inch in 1 hour were recorded for Boulder County, Jefferson County, Denver County and Arapahoe County. A total of 16 rainfall alarms were recorded on this day. Twenty-four hour rainfall totals exceeding 2 inches were recorded in Jefferson County at West Woods and Brook Forest.

X
X
X
X
X
X
X
X
28
0.43"
0.08"
>0.44"
   

Message 1 issued for Boulder County, Jefferson County and Douglas County at 2100. No rain alarms were recorded on this day.

               
29
0.47"
0.54"

>1.58"

   

Message 1 issued for Boulder County, Jefferson County and Douglas County at 1413. Message 1 issued for the remainder of the District at 1618. No rain alarms were recorded on this day.

X
         
X
X
30
1.50"
2.54"
>1.94"

Table

Map

Message 1 issued for the entire District at 1236. Heavy rain with rainfall alarms exceeding both 0.5 inches in 10 minutes and 1 inch in 1 hour were recorded in Douglas County and Jefferson County.

X
X
 
X
X
X
X
X
31
3.07"
2.70"
>3.14"

Table

Map

Message 2 issued for the entire District at 1057. Message 3 issued for Douglas County at 1915. Largest storm of the year to date with heavy rainfall occuring in Jefferson County, Douglas County and Arapahoe County. Rainfall alarms exceeding both 0.5 inches in 10 minutes and 1 inch in 1 hour were recorded in these areas. Rainfall totals exceeding 3 inches were recorded in northwestern Douglas County. The area between Chatfield Reservoir and Castle Rock experienced rainfall totals exceeding 2 inches.

X
X
X
   
X
X
X
32
0.35"
0.63"
>1.42"
   

Message 1 issued for Boulder, Jefferson and Douglas counties at 1513, Message 1 issued for the remainder of the District at 1601. The ingredients for strong storms existed but only weak storms developed and moved NW to SE across the District. Only a few reports of greater than 0.5" occurred. No rainfall rate or stage change alarms were triggered.

     
X
   
X
X
33
1.77"
1.71"
>1.64"

Table

Map

Message 1 issued for Boulder, Broomfield, Adams at 1606. Message 1 issued for DIA at 1719, Message 1 issued for Jefferson, Denver, Arapahoe and Douglas counties and Aurora at 2134. Storms moved NW to SE across the District from 5PM to 11:30PM. Widespread, heavy rainfall was observed across Boulder, Broomfield, Adams, Denver, Arapahoe and Douglas counties. Eight rainfall rate alarms were issued. Stage change alarms were issued for 15 stations.

X
X
X
X
X
X
X
X
34
0.55"
0.60"
>0.87"

Table

Map

Message 1 issed for Boulder, Jefferson and Douglas Counties at 1329. Message 1 issued for the remainder of the District at 1410. Fast moving thunderstorms moved NW to SE across the District from 4PM to 11PM. Moderate to heavy rainfall occurred in the W and NW areas of the District. Two Rainfall rate alarms near the Fourmile Burn area were issued. One stream rise alarm at Lena Gulch was issued.      
X
     
X
35
1.85"
1.11"
>2.27"

Table

Map

Message 1 issued for all counties at 1306. Thunderstorms developed after 1330 with several lulls until 730PM, with rain continuing until 1030pm. Storms moved quickly from NW to SE. Widespread rain occurred across the District with highest measured rainfall in Boulder, Jefferson and Douglas Counties. Rainfall rate alarms were issued for several gages in the Hayman burn area. Five stations within the District including Lena, Harvard and Slaughterhouse Gulches, Havan Park and Sable Ditch issued stage rise alarms.
X
X
X
X
   
X
X
36
0.16"
0.63"
>1.73"
    Message 1 issued for Boulder, Jefferson and Douglas Counties at 1354. Moderate thunderstorms moved across the District beteen 2PM and 5PM, with only light rain reported. No rainfall rate or stage change alarms were issued.            
X
X
37
0.51"
0.47"
>1.45"

Table

 

Message 1 issued for Boulder, Jefferson and Douglas Counties at 1204 followed by Denver, Arapahoe, Aurora at 1225 and Broomfield at 1248. Three waves of thunderstorms moved across the District between 12:30PM and 8:00PM producing moderate rainfall. One rainfall alarm 0.2" in 30 minutes was issued in the Hayman Area at the Rampart Range Road station. No stage change alarms were issed.

       
X
 
X
X
38
0.63"
0.56"
>0.82"

Table

Map

Message 1 issued for Boulder, Jefferson and Couglas Counties at 1337 and the remainder of the District at 1429. Two waves of showers and thunderstorms moved across the District from 4PM to 8PM producing rainfall over the southern portion of the District. One rainfall alarm occurred over the Hayman Burn area. Stage change alarms were issued at four stations: Expo Park, Sable, Holly Dam and Harvard Gulch.

 
X
X
   
X
X
X
39
0.87"
1.42"
>2.05"

Table

Map

Message 1 issued for Boulder, Jefferson, Douglas county and Aurora at 1619. Storms developed late in the day producing only scattered areas of precipitation, the heaviest occurred primarily outside the District boundary. The SE portion of the District received the heaviest rainfall. Two Hayman stations issued rainfall rate alarms. No stage change alarms were issued.

X
X
X
X
 
X
X
X
40
1.10"
1.01"
>1.23"

Table

Map

Message 1 issued for Boulder, Jefferson, Douglas county at 1242 and the remainder of the District at 1404. Thunderstorms developed in the central and northern part of the District and moved to the SE. Moderate to heavy rainfall was measured along a line through the District. Rainfall also occurred to the W of the District. 2 stations issued rainfall alarms: Sand Creek Park and Big Dry Creek at Heritage Regional Park (2 Hayman gages issued rainfall alarms also). 5 stations issued stage change alarms: Sand Creek Park, Montview Park, Expo Park, Havana Park and Sable Ditch.

X
X
X
   
X
X
 
41
2.24"
2.28"
>2.19"

Table

Map

Message 2 issued for the entire District at 1113 valid until 7/30 at 1800. A large area of moisture moved over the District resulting in widespread rainfall and embedded thunderstorms. 0.5" - 2.2" of rain was measured over the entire District. SE Boulder county and S Denver received the most rainfall. Only 1 station (Hardvard Gulch) issued rainfall alarms (1 Hayman gage issued rainfall alarms also). 13 stations issued stage change alarms.
X
X
X
X
X
X
X
X
42
3.35"
2.53"
>2.08"

Table

Map

Message 2's continued from previous day. Continued widespread rainfall occurred. 0.4" - 3.35" was measured by ALERT stations throughout the District. SE Boulder county and areas just W of Denver received the most rainfall. The atmosphere was too cool for thunderstorm development. Only 1 station (Bear Creek at Lowell) issued rainfall alarms. 17 stations issued stage change alarms.
X
X
X
X
X
X
X
X
43
1.38"
0.59"
>1.60"

Table

Map

Message 1 issued for Boulder, Jefferson and Douglas Counties at 1349. Thunderstorms developed between 4-5PM with strongest storms outside of the District to the W and S. The District did not receive heavy rainfall. Douglas County experienced the heaviest rainfall with three stations issuing rainfall rate alarms. No stage change alarms were issued.            
X
X
44
1.02"
1.37"
>1.33"

Table

Map

Message 1 issued for all Counties and Cities between 1113 and 1241. Two waves of thunderstorms produced strong storms resulting in moderate to heavy rainfall over the District. 6 stations issued rainfall rate alarms, 14 stations issued stage change alarms.
X
X
X
   
X
X
X
45
0.63"
0.31"
>0.98"
    Message 1 issued for Boulder, Jefferson and Douglas counties at 1333, for Adams County at 1411 and for the remainder of the District at 1635. Storms did not materialize as expected resulting in only isolated storms in the S portion of the District. One rainfall rate alarm in the Hayman area was issued. No stage change alarms were issued.
X
         
X
X
46
0.24"
0.32"
>0.80"

Table

Map

Message 1 issued for Boulder, Jefferson and Douglas counties at 1106 and the remainder of the District at 1302. Storms occurred mainly in the foothills, with isolated but strong storms in SW Boulder County and in Aurora. 1 rainfall rate alarm was triggered in the Hayman burn area.  
X
       
X
X
47
1.46"
0.78"
>1.50"

Table

Map

Message 1 issued for Boulder, Jefferson and Douglas counties at 1305 and Arapahoe, Adams, Aurora and DIA at 1612. Moderate rain occured in areas surrounding the District. 4 stations issued rainfall rate alarms, no stage change alarms were issued.
X
   
X
   
X
X
48
0.51"
0.48"
>0.60"
    Message 1 issued for Jefferson County at 1542 for a strong isolated thunderstorm cell over Jefferson County, which produced moderate rainfall in the W and SW portion of the District. No rainfall rate or change stage alarms were issued.              
X
49
0.67"
0.62"
>0.75"
    Message 1 issued for Douglas and Arapahoe Counties and Aurora at 1523. Thunderstorms developed over the S and SE portions of the District producing moderate to heavy rainfall. No rainfall rate or change stage alarms were issued.  
X
       
X
X
50
0.94"
0.56"
>1.20"

Table

Map

Message 1 issued for all counties at 1333. Thunderstorms developed by 2PM but quickly weakened. Some additional storms developed, but did not produce heavy rainfall over the District. No rainfall rate or change stage alarms were issued for the District.  
X
         
X
51
0.51"
0.84"
>0.82"

Table

Map

Message 1 issued for all areas except Douglas county at 1327. One round of thunderstorms developed with moderate rainfall over the N and E portions of the District. Two rainfall alarms occurred at Brighton ETO. Two stage change alarms occurred (Boulder Ck at Broadway, Louisvill Dwy).
X
X
X
X
       
52
1.93"
2.09"
>1.84"

Table

Map

Message 1 issued for Douglas, Arapahoe, Aurora at 1641, Adams at 1652, DIA at 1727. Thunderstorms developed late in the day producing moderate to heavy rainfall throughout the District. 10 rainfall alarms, 27 stage change alarms were issued.
X
X
X
   
X
X
X
53
0.94"
0.93"
>0.96"

Table

Map

Message 1 issued for entire District at 1229. Message 2 issued for Douglas County at 1652, then downgraded to message 1. Thunderstorms developed and moved quickly across the central portion of the District. 2 rainfall alarms and 2 stage change alarms were issued.
X
X
X
   
X
 
X
54
0.71"
0.75"
>1.55"
    Message 1 issued for entire District at 1419. Several rounds of thunderstorms occurred over the District. Some storms were severe with large hail. No rainfall alarms were issued, 5 stage change alarms were issued.
X
   
X
   
X
X
55
0.91"
1.10"
>0.85"

Table

Map

Message 1 issued for Douglas, Arapahoe, Aurora and Jefferson Counties at 1413, Boulder at 1417. Thunderstorms with moderate to heavy rainfall occurred primarily in the central and southern portion of the District. 1 rainfall and 4 stage change alarms were issued.            
X
 
56
0.98"
0.95"
>0.91"

Table

Map

Message 1 issued for entire District at 1412. Storms producing moderate to heavy rainfall occurred primarily in the W portion of the District. 3 rainfall alarms and 3 stage change alarms were issued.
X
   
X
 
X
 
X
57
0.39"
0.62"
>0.97"
    Message 1 issued for Douglas, Arapahoe, Aurora and Jefferson Counties at 2012. A large storm containing embedded thunderstorms developed over the mountains and moved into the SW portion of the District and Douglas County. Moderate to heavy rainfall was produced in the S and SW portions of the District. No rainfall rate or stage change alarms occurred.            
X
X
58
0.91"
1.72"
>2.52"

Table

  Message 1 issued for Douglas, Jefferson and Boulder Counties at 1229, and Arapahoe and Aurora at 2001. Thunderstorms developed over the mountains and moved slowly over the District, producing moderate to heavy rainfall in the central and SW portion of the District. 1 rainfall rate alarm occurred in the Hayman Burn area. 7 stage change alarms were issued.            
X
X
59
0.31"
0.54"
>0.46"
    Message 1 issued for Douglas, Jefferson and Boulder Counties at 1245, and Arapahoe and Aurora at 1537. Thunderstorm cells developed in the foothills and produced brief, heavy rains in the central and SW portion of the District. A line of strong storms developed E of the District. No rainfall alarms were issued, 2 stage change alarms were issued.                
60
1.85"
2.64"
2.80"

Table

Map

Message 1 issued for all counties and cities 1320. A strong upper level low pressure system moved into Colorado. Thuderstorms developed over higher terrain and moved into the District starting at noon. Strong storms produced damaging hail. Storms re-developed in the early evening producing continued rainfall. 13 stations produced rainfall alarms. 26 stations produced stage change alarms.
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