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2013 Season Summary

Meteorological support services for 2013 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
1.54"
2.40"
> 2.85"
 Table Map
Map2

Message 1 issued at 1352 for Arapahoe, Douglas and Jefferson Counties including the City of Aurora.

Message 1 issued at 1526 for Broomfield and Adams Counties.

Message 1 issued at 1601 for Boulder and Denver Counties including the City of Boulder and the Four Mile Burn Area (FMBA) and DIA.

Moderate to heavy rain showers and thunderstorms moved through the District from east to west. Heavy rainfall observed in Douglas County and Boulder County. Not a great correlation between ALERT, CoCoRAHS and radar rainfall.

X
X
X
X
 
X
X
X
2
0.75"
0.58"
> 1.33"
 Table  Map

Message 1 issued at 1600 for Adams, Denver and Arapahoe Counties including DIA and the City of Aurora.

Message 1 issued at 1630 for Jefferson and Broomfield Counties.

Moderate rain showers and thunderstorms moved through the northeast and central portions of the District. Heavy rainfall observed just outside the District boundary to the northeast. Much better correlation during this event between ALERT, CoCoRAHS and radar rainfall.

X
X
X
X
X
X
X
X
3
0.79"
0.75"
> 0.92"
   

Message 1s issued for Boco, Jeffco and Dougco at 0758 valid until 2000. 0.40 to 1.10 in 10-30 minutes. Up to 1.50 due to training thunderstorm cells.

Message 1s issued for Brmco, Denco, DIA, Arapaco, Aurora and Adco at 0828 valid until 2000. 0.40 to 1.10 in 10-30 minutes. Up to 1.50 due to training thunderstorm cells.

Moderate storms occurred in the District and in eastern Douglas County. Good correlation occurred between ALERT, CoCoRAHS and radar rainfall in the thunderstorm bands although some CoCoRAHS stations measured higher precipitation compared to radar in the southern portion of the district.

 
X
X
X
 
X
X
X
4
0.20"
0.23"
> 0.96"
   

Morning HPO issued with Moderate Message Potential at 0956

Message 1s Issued for Jefferson, Denver, Douglas, Arapahoe, Aurora, Adams at 1532

Message 1s Issued for Boulder/Broomfield 1551

Severe Thunderstorm Warning issued for far eastern areas at 1847 until 1915

Moderate rain showers and thunderstorms developed east of the District and in eastern Douglas County. A good correlation occurred between ALERT, CoCoRAHS and radar rainfall in the thunderstorm bands.

There was not any heavy rainfall that developed within the District boundaries.

 
X
       
X
 
5
0.91"
0.35"
> 1.95"
   

Morning HPO issued with Moderate Message Potential at 0950

Message 1s Issued for Denver, DIA, Douglas, Arapahoe, Aurora, Adams at 1407

Tornado Warning Issued for central Arapahoe County at 1413 until 1430


Tornado Warning issued for Denver/DIA at 1421 until 1445

Strong storms developed in the eastern portion of the district centering near DIA. A tornado touched down on DIA property. Large hail and heavy rainfall also accompanied the strong and severe thunderstorm cells. Heaviest precipitation in the District occurred over an area with minimal gauge or spotter coverage. Good correlation occurred between ALERT, CoCoRAHS and radar rainfall in the thunderstorm bands where gages existed.

Strong storms occurred in eastern Douglas County. Good correlation occurred between ALERT gages and the highest rainfall indicated by radar.

Highest UDFCD Gauge total: 0.91 West Cherry Creek SE Douglas County

X
X
X
   
X
X
X
6
0.71"
0.95"
> 1.92"
   

Message 1s issued for Douglas, Arapahoe, Aurora at 1836 valid to 2200. 0.40" to 0.90" expected in 10-30 minutes. Up to 1.5" in thunderstorm cells.

Message update issued at 2157. Message 1s issued for Jeffco, Broomfield. Message 1's extended to 2330.

Multiple waves of strong storms moved across the District from 6pm to midnight. Moderate to heavy rainfall occurred in counties and cities that had Message 1's issued. Good correlation occurred between ALERT, CoCoRAHS and radar where highest rainfall occurred in south eastern portion of the District.

A large area of much heavier rain was indicated by radar east and northeast of the District.


X
X
X
   
X
X
X
7
0.83"
1.06"
> 1.37"
 Table
 Map

Morning HPO issued with Low Message Potential at 1034

Message 1s issued for Boulder, Four Mile Burn Area, Jefferson, Broomfield counties at 1758.

Message 1s issued for Douglas, Arapahoe counties at 1916.

Message 1s issued for remainder of district at 1928.

Severe thunderstorm warnings for specific areas issued starting at 1751

Small Stream Flood Advisory issued for Four Mile Burn Area at 2219.

Moderate to heavy rain occurred in bands throughout the District in the evening, with highest rainfall in the northwest and southeast portion of the District. One narrow band of higher rainfall occurred in the centeral part of the District. Storms were generally brief, less than 20 minutes. 24-hour rainfall totals varied from 0.01 to 1.06 inches. Good correlation occurred between radar and CoCoRAHS/Alert gages.

A large area of heavy rain was indicated by radar east and southeast of the District.


X
X
X
X
X
X
X
X
830JUN0.67"0.57"> 0.76"    

Morning HPO issued with High Message Potential at 1034

Message 1s issued for Adams, Denver/DIA, Douglas, Jefferson and Arapahoe Counties at 1910

Fast moving storms began around 7PM. Rainfall occurred along a band in the central District. Highest rainfall fell in Northern Douglas County. Good correlation of radar and ALERT data. One CoCoRAHS station measured high precipitation in an area of low total rainfall as indicated by radar.

An area of higher precipitation occurred SE of the District.

            X  
910JUL0.83"0.97"> 0.99"TableMap

Message 1s issued for Arapahoe, Aurora, Douglas, Jefferson, Boulder Counties and Four Mile Burn Areas at 1235

Message 1's issued for Denver, DIA, Broomfield and Adams County at 1258

Slow moving storms began around 1PM and occurred throughout the afternoon. Rainfall occurred along a narrow band in the west and southwest portion of the District. Highest rainfall fell in near Red Rocks Park.

Good correlation of radar and ALERT data near the peak rainfall area. One CoCoRAHS station in the central portion of the District reported higher precipitation than detected by radar. Radar quantification in Douglas County were in general larger than measured by ground stations..

More intense storms and more widespread rainfall occurred east and southeast of the District.
XX         XX
1011JUL 1.14" 0.86" > 1.35"    

Moderate rainfall occured in Jefferson County and in western portions of the District. The heaviest rainfall remained west of the District's forecast area in Park County and Clear Creek County.

X
X
       
X
X
1112JUL 0.91" 1.61" >1.67" TableMap
Map2

Moderate to heavy rainfall was observed in Boulder County including the FMBA and Douglas County. Rain alarms were triggered in Boulder County at Gold Hill, Sunshine and Lee Hill. Gold Hill recorded more than 0.5" in 30 minutes.

     
X
   
X
 
1213JUL 2.68" 3.49" >2.23" TableMap

Extreme rainfall was observed in Jefferson County and Denver County with heavy rainfall in Adams County, Arapahoe County, Boulder County and Douglas County. Rain alarms of 0.5 inch/10 min and 1.0 inch/1 hr were exceeded at numerous stations in Jefferson and Denver Counties.

Heavy rainfall resulted in 27 rainfall alarms and 31 water level alarms.

Significant flooding occurred in the Lakewood Gulch and Lena Gulch watershed affecting Lakewood, Wheat Ridge and Denver.

Rising water levels were observed along East Toll Gate Creek, Sable Ditch at Colfax, Guldsmith Gulch, Harvard Gulch, Expo Park, Montviwe Park, Sports Complex, Sand Creek, Cherry Creek, South Platte River, Slaughterhouse Gulch and Lena Gulch. High water levels were observed in Maple Grove Reservoir and Englewood Dam.

X
X
 
X
 
X
X
X
1314JUL 1.93" 2.48" >2.33" Table

Heavy rainfall was observed in Boulder County, Jefferson County and Douglas County. Rain alarms of 0.5 inch/10 min and 1.0inch/1 hr were exceeded at numerous stations in Boulder County including Taylor Mountain, Gold Lake, Winiger Ridge, St. Antons, Riverside, Fling's and Sunset. Rain alarms of 0.25 inch/10 min were exceeded at numerous stations in the FMBA.

Heavy rainfall resulted 20 rainfall alarms and 4 water level alarms.

     
X
 
X
X
X
1415JUL 1.73" 1.30" >1.63" TableMap

Heavy rainfall was observed in Adams County, Arapahoe County, Denver County, the City of Aurora and Boulder County including the FMBA. Rain alarms of 0.5 inch/10 min and 1.0 inch/1 hr were exceeded at numerous stations in Adams County, Denver County and Arapahoe County including Sand Creek, Aurora Town Hall, East Toll Gate at Buckley, Goldsmith at Eastman and Sable Ditch. FBMA rain alarms of 0.25 inch/10 min were exceeded at Logan Mill and Gold Hill.

Heavy rainfall for the third day in a row resulted in 12 rainfall alarms and 31 water level alarms.

X
X
X
X
X
X
 
X
1518JUL 0.87" 0.70" >1.06" Table

Moderate rainfall was observed in southern Douglas County. Heavy rainfall was observed in Boulder County including the FMBA. Rain alarms of 0.75 inch/1 hr were exceeded at Gold Hill.

Moderate rainfall resulted in 3 rainfall alarms.

X
   
X
   
X
 
1619JUL 0.00" 0.32" > 0.26"     Very little rainfall observed on this day throughout the District.                
1720JUL 0.51" 0.50" >1.21"     Moderate rainfall was observed in Arapahoe County, Adams County, Broomfield County and eastern Boulder County. The heaviest rainfall occured east of the District in Elbert County.
X
X
X
X
X
X
X
X
18 24JUL 0.59" 0.57" >1.37"  Table Map  Moderate rainfall was observed in southern Douglas County including the Hayman Burn area. A total of 5 rainfall alarms were triggered at West Creek, Trail Creek and Horse Creek in the Hayman Burn area.            
X
 
19 25JUL 0.63" 0.92" >0.64" Table  Moderate rainfall was observed in Boulder County triggering 2 rainfall alarms at Whispering Pines and Sunshine.      
X
     
X
20 27JUL 1.69" 1.31" >1.80"  Table Map 

Heavy rainfall was observed in Douglas County triggering 6 rainfall alarms at Tallman Gulch, Cherry Creek at Stroh Road, Salisbury Park, Bingham Lake Park and East Cherry Creek at Russelville Road.

Heavy rainfall was also observed in Adams County and Denver County where stream levels exceeded alarm conditions at Sable Ditch at Colfax, Harvard Gulch, SPR at 19th Street and Expo Park.

X
       
X
X
X
21 28JUL 0.75" 0.27" >0.83"     Minor rainfall was observed throughout the District. Some moderate rainfall was recorded in southern Douglas County.          
X
   
22 29JUL 0.69" 0.88" > 1.38" Table Moderate rainfall was observed in Jefferson County and Douglas County. Localized heavy rainfall was observed in Boulder County. One rain alarm at Porphory Mountain was triggered in Boulder County in the FMBA of 0.5 inch in 30 minutes.      
X
 
X
 
X
23 30JUL 0.28" 0.63" > 0.54"     Minor rainfall accumulations observed throughout the District. Rising water levels observed in Sable Ditch at Colfax and Louisville Dowdy Draw.                
24 01AUG 0.55" 0.49" > 0.77"  Table Moderate rainfall was observed in Boulder County, Jefferson County and Douglas County. One rain alarm triggered at Betasso of 0.5 inch/10 min. Rising water levels were observed in Lower Left Hand Creek and in Boulder Creek at Broadway.      
X
       
25 03AUG 2.56" 3.40" > 2.70" Table 

Heavy rainfall observed in the central and eastern portions of the District. A total of 34 rain alarms were triggered on this day. Rainfall accumulations exceeded 0.5 inch/10 min and 1.0 inch/1 hour in Adams, Denver, Arapahoe and Douglas Counties at the following sitess; Aurora Fire Station 12, Sand Creek at Colfax, SPR at 3rd Ave, Flying J Truck Plaza, Harvard Gulch Park, Murphy Creek Golf Course, Side Creek Park, Sable Ditch at Colfax, Pump Station No. 3, Granby Ditch at 6th, Aurora Reservoir, Sulphur Gulch, Cherry Creek at Cottonwood Park and Tallman Gulch.

Boulder County also received heavy rain as rain alarms exceeding 0.5 inch/10 min were triggered at Red Hill, Geer Canyon, Fling's, and Gunbarrel. Gunbarrel also exceeded 1 inch/1 hour.

Horse Creek in the Hayman Burn area of Douglas County received more than 1.3 inch/1 hour.

Rising water levels observed in many streams within the District. High flows were observed on East Toll Gate Creek, Sable Ditch, No Name, Goldsmith Gulch, Harvard Gulch, Expo Park, Montview Park, Sports Complex, Niver Detention, Sand Creek, Cherry Creek, South Platte River, Slaughterhouse Gulch, Englewood Dam, Lakewood Gulch, Lena Gulch.

A total of 30 water level alarms were triggered on this day.

X
X
X
X
X
X
X
X
26 04AUG 0.55" 0.64" >1.07"    

Moderate rainfall fell in Douglas County and Denver County. Rising water levels were observed in Sable Ditch at Colfax, Expo Park, Sand Creek and South Platte River at Henderson.

         
X
X
 
27 05AUG 0.55" 0.34" >0.96"  Table Map  Moderate rainfall observed in Boulder County including the FMC burn area. Lazy Acres rain gage triggered an alarm of 0.5 inch/30 min. That was the only alarm observed on this day.
X
X
 
X
 
X
   
28 06AUG 0.24" 0.62" >1.51"     Moderate rainfall observed in Jefferson County. No alarms triggered this day.          
X
 
X
29 07AUG 0.47" 0.10" >0.74"     Moderate rainfall was observed in Boulder County with accumulations of 0.5". Interesting to note that the QPE data showed nothing in Boulder County. Otherwise minimal rainfall was observed throughout the District.          
X
   
30 08AUG 2.91" 2.75" >2.56"  Table Map 

Heavy rainfall was observed in Arapahoe County, Denver County, Douglas County. Rainfall alarms exceeding 1 inch/ 1 hr were triggered at Utah Park, Expo Park, Virginia Court, Aurora Town Hall, Jewell Detention and Iliff Pond. In Douglas County more than 1 inch/1 hr was detected at Happy Canyon at North Surrey Drive.

Rising water levels were detected along the South Platte River, Cherry Creek, Utah Park, Englewood Dam, Sand Creek, Expo Park, Montview Park, Havana Park, Goldsmith Gulch, Harvard Gulch, Sable Ditch and Slaughterhouse Gulch.

X
X
X
 
X
X
X
X
31 09AUG 0.79" 1.44" >1.83" Table   Map

Heavy rainfall was observed in Arapahoe County and Douglas County. Rainfall alarms exceeding 0.5 inch/10 min were triggered at Confluence Pond and Murphy Creek Golf Course. Four Mile Creek also triggered a rain alarm in the Hayman Burn Area.

Rising water levels were detected along the South Platte River, Confluence Pond, Slaughterhouse Gulch, No Name at Quincy, Sable Ditch, Englewood Dam, Holly Dam and East Toll Gate Creek.

X
X
X
   
X
 
X
32 10AUG 0.71" 0.80" >1.27"     Heavy rainfall was again observed in Arapahoe County and Adams County. Rainfall alarms were not triggered on this day, however rising water levels were detected along Harvard Gulch, No Name at Quincy and Montview Park.
X
X
X
   
X
X
X
33 11AUG 0.39" 0.45" >0.78"     Moderate to heavy rain was observed in a narrow band across the central and SW portion of the District. Rainfall alarms were only triggered at Harvard and Goldsmith Gulches.            
X
X
34 12AUG 1.85" 1.42" >1.58" Table  Moderate to heavy rain occurred throughout the District. 23 ALERT alarms were triggerred. Precipitation alarms were triggerred for Boulder, Douglas, Jefferson county ALERT gages, including the gages in the Fourmile Canyon and Hayman Burn areas. Stage alarms occurred for Bear Creek, Boulder Creek, Harvard Gulch, Sable Ditch and Slaughterhouse Gulch.
X
X
X
X
   
X
X
35 13AUG 0.71" 0.47" >1.14" Table  High message potential was indicated early in the day, but thunderstomed weakened over the District resulting in rainfall primarily near and outside of the District boundary. Rainfall alarms occurred at Sunset and West Cherry Head only. Stage rise alarms occurred for Slaughterhouse Gulch and SPR at Henderson.
X
   
X
   
X
 
36 18AUG 0.08" 0.06" >1.05"     Moderate rain occurred only in three isolated areas near the District boundary. No rainfall or stage rise alarms were triggered.
X
             
37 21AUG 0.98" 1.59" >1.59" Table  Map  Heavy rain occured along an East-West band through the central District. One rainfall alarm for Upper Leyden occurred, which corresponded with the maximum ALERT-measured rainfall. One stage rise alarm was triggered at Niver Detention Basin.
X
 
X
X
X
X
 
X
38 22AUG 1.97" 2.48" >3.17 Table   Map Thunderstorms producing heavy rain and hail occurred over the foothills and SW, S and NE portions of the District. The largest areas of precipitation inside the District occurred over Douglas County. Precipitation alarms were triggered at EPC at Columbine Open Space, West Metro Fire Station and West Creek in the Hayman Area. Rising water level alarms were triggered at Lakewood Gulch, Gross Reservoir and Boulder Falls. A large area of precipitation occurred south of the District.
X
X
X
   
X
X
X
39 23AUG 0.51" 0.70" >1.45"     Thunderstorms producing widespread heavy rain and hail occurred over the foothills and western side of the District with smaller areas of precipitation in the NE, central and southern portions of the District. Two stage rise alarms were triggered at Sable Ditch at Colfax. More intense rainfall fell on the foothills W of the District.
X
   
X
 
X
X
X
40 24AUG 0.91" 0.81" >1.40"     Scattered thunderstorms began in the afternoon throughout the District. The largest bands of precipitation occurred west of the District boundary and south of the District in Douglas county. Only 1 rainfall alarm was triggered at Rampart Range Road.      
X
   
X
X
41 25AUG 0.24" 0.13" >0.28"     Only light rain was observed across the District. No rainfall or stage rise alarms were triggered.                
42 26AUG 1.34" 1.63" >0.91" Table Thunderstorms developed over the mountains. Rainfall occurred primarily over the Fourmile Burn Area. 8 precipitation alarms were triggered at 5 stations: Twin Sisters, Swiss Peaks, Sunshine, Whispering Pines and Lee Hill.      
X
       
43 27AUG 0.16" 0.12" >0.32"     Thunderstormed developed over the foothills and produced light rain over the District. No rain or stage alarms were triggered. Heavy rainfall was observed over NW Boulder County.                
44 30AUG 0.51" 0.35" >0.62"     Thunderstorms developed and moderate to heavy ran occurred on the SW boundary of the District. 1 stage alarm was triggered at Bear Creek below Cub.              
X
45 03SEP 0.59" 0.87" >1.01"     Slow moving thunderstorms produced small areas of moderate and brief heavy rainfall. No rain or stage alarms were triggered.          
X
X
X
46 04SEP 2.01" 1.38" >2.65"     Slow moving thunderstorms produced areas of heavy rainfall in the E and SE portion of the District. 3 rain and 1 stage alarms were triggered.
X
X
X
   
X
X
 
47 05SEP 0.24" 0.43" >1.15"     Short-lived thunderstormed occurred along a wind convergence line from SW to NE across the district. 3 stage alarms were triggered.
X
X
       
X
 
48 09SEP 2.44" 3.26" >2.14"     Three lines of moderate and strong thunderstorms moved W to E across the District producing moderate to heavy rain across the District. The heaviest rain was in the NW portion of the District. 29 rain and 53 stage alarms were triggered.
X
   
X
X
X
X
X
49 10SEP 1.81" 2.13" >1.66"     Two waves of moderate and strong thunderstorms moved from SW to NE across the District producing widespread rainfall across the District. 21 rain and 55 stage alarms were triggered. Large areas of precipitation also ocurred E of the District. These storms were the beginning of the MONUMENTAL RAINFALL EVENT that continued through 9/13.
X
X
X
X
X
X
X
X
50 11SEP 8.03" 8.67" >3.47"     MONUMENTAL RAINFALL EVENT. 94 rain and 210 stage alarms were triggered. Total rainfall over 5 days: 2.26" at DIA to 16.06" south Boulder (ALERT gage 4870) and 18.31" (CoCoRaHS BO-33 in south Boulder). Highest rainfall in the District occurred in the NW.
X
X
X
X
X
X
X
X
51 12SEP 6.89" 7.31" >5.06"     MONUMENTAL RAINFALL EVENT. 32 rain and 248 stage alarms were triggered. Highest rainfall in the District occurred over Arora and the NW portion of the District.
X
X
X
X
X
X
X
X
52 13SEP 0.91" 1.09" >1.09"     Continued rain with thunderstorms in the afternoon. 1 rain and 47 stage and 2 flasher alarms were triggered. Storm activity ended in the evening.
X
           
X
53 14SEP 2.76" 3.31" >3.78"     After a lull in storm activity for an evening and most of the day, strong thunderstorms occurred again. Most rainfall ocurred in the E and S portions of the District. 52 rain and 164 stage and 2 flasher alarms were triggered. Storms would continue overnight.
X
X
X
X
 
X
X
X
54 15SEP 2.09" 2.81" >2.04"     A cold front moved in the during the morning producing showers and thunderstorms. Rain continued until the afternoon. Heaviest rainfall occurred in the N and NW portion of the District. 11 rain and 122 stage alarms were triggered.
X
X
X
X
X
X
X
X
55 16SEP 0.24" 0.20" >0.56"     Foothills thunderstorms occurred resulting in weak showers over the District. 0 rain and 64 stage alarms were triggered.                
56 18SEP 0.16" 0.18" >0.85"     Thunderstorms occurred, but most were fast moving with one slow moving storm in eastern Boulder County. Rainfall over the District was very light. 0 rain and 11 stage alarms were triggered.      
X
       
57 22SEP 1.50" 2.10" >2.07     Two waves of strong and severe thunderstorms moved from SW to NE across the district. Storms were fast moving but produced heavy rain across the District. 0 rain and 33 stage and 2 flasher alarms were triggered.
X
X
X
X
X
X
X
X
58 23SEP 0.12" 0.20" >0.18"    

TBD

0 rain and 5 stage alarms were triggered.

               

 

 

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