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2011 Season Summary

Meteorological support services for 2011 were 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

11-MAY

1.73"

1.89"

3.88"

 Table
 Map

M-2 issued for Boulder County and Fourmile Burn area at 0752. Precipitation occured as rain and snow with snow at elevation 6,500 feet. Precipitation occured across the entire District.

 

Rainfall alarms exceeding 0.25" in 1 hour occured at 4110 Betasso at 05/11/2011 at 15:22 and 4230 Golden Age at 05/12/2011 13:50.

 X

 X

 X

 X

2

18-MAY

2.17"

2.86"

3.62"

Table
 Map

M-2 issued for Fourmile Burn area at 0735. M-1 issued for the entire District at 1246. Red Flood Alert issued for Adams County, Arapahoe County, Aurora and DIA.

 

NWS issued tornado warning at 1322 for NW Adams County and Eastern Broomfield County. NWS issued tornado warning at 1430 for West Central Adams County.

 

Rainfall alarms exceeding 0.50" in 10 minutes occured at 1480 Third Creek at DIA in Denver County.

 

Rainfall alarms exceeding 1.00" in 1 hour occured at 210 Leyden Confluence and 320 Sports Complex. Both in Jefferson County.


  X

  X

  X

  X

  X

 X

 

  X

3

20-MAY 1.14" 0.76" 0.50" Table
Map

M-1 issued for the entire District at 1159. Moderate rainfall amounts reported throughout the District.

FMC specific rainfall alarms exceeding 0.25" in 1 hour occured in Boulder County.

No rainfall alarms exceeding the District default thresholds of 0.50" in 10 min or 1.00" in 1 hour occured.

 

 

 

  X

 

 

 

  X

4

23-MAY 0.55" 0.31" 0.90"    

M-1 issued for the entire District at 1103. Minimal rainfall accumulation reported throughout the District.

No FMC alarms exceeding 0.25" in 1 hour were reported.

No District alarms exceeding 0.50" in 10 minutes or 1.00" in 1 hour were reported.

 

X

 

 

X

 

5

24-MAY 0.63" 0.72" 1.81"    

M-1 issued for the entire District at 941. Moderate rainfall accumulation reported throughout the District.

No FMC alarms exceeding 0.25" in 1 hour were reported.

No District alarms exceeding 0.50" in 10 minutes or 1.00" in 1 hour were reported.

X X X        

6

11-JUN 0.20" 0.20" 0.74"    

M-1 issued for the entire District at 1249. Moderate rainfall observed within the District. Heavy rainfall observed in Elbert and Eastern Arapahoe Counties.

No District alarms were reported.

           

X
 

7

13-JUN 0.71" 0.85" 1.57"    

M-1 issued for Jefferson County, Douglas County, Adams County, Denver County, DIA, Arapahoe County and the City of Aurora at 811 PM.

Red Flood Alert issued for Denver County and Arapahoe County at 843 PM.

Red Flood Alert issued for the City of Aurora at 858 PM.

Red Flood Alert issued for Adams County and DIA at 927 PM.

Heavy rainfall recorded at station 1640 (SPR at Union) of approximately 0.71 inches in an hour.

No District alarms were triggered.

X X X     X    

8

17-JUN 1.22" 1.15" 1.29"  Table
 Map

M-1 issued for Jefferson County, Douglas County, Arapahoe County and the City of Aurora at 1220 PM.

M-1 issued for Denver County, Adams County, and DIA at 1235 PM.

Red Flood Alert issued for Douglas County, Arapahoe County and Aurora at 1255 PM.

Rainfall alarms activated in Douglas County: 2840 Sulphur Gulch 0.51"/10-min, 2860 Cherry Creek at Stroh 0.51"/10-min, 2820 Haskins Gulch 0.51"/10-min, 2860 Cherry Creek at Stroh 1.02"/1-hr.

  X X       X  

9

19-JUN 2.28" 2.58" 2.70" Table  Map

M-1's issued for entire District at 1424 PM

NWS Small Stream Flood Advisory issued for Fourmile burn area at 1100 PM.

Moderate and heavy rainfall was observed across the entire District.

Rainfall alarms activated in Boulder County: 4090 Magnolia 0.28"/1-hr, 4240 Sunset 0.28"/1-hr, 4090 Magnolia 0.51"/10-min, 4730 Sugarloaf 0.28"/1-hr, 4090 Magnolia 0.79"/1-hr, 4110 Betasso 0.28"/1-hr.

X X X X X X X X

10

20-JUN 0.59" 0.90" 0.99"    

M-1's issued for entire District on 6/19 extended through 0200 AM 6/20.

Red Flood Alert issued for Northern Jefferson County and Arvada at 0024 AM.

NWS extends Small Stream Flood Advisory for Fourmile burn area at 0031 AM.

Red Flood Alert issued for Jefferson County, Wheat Ridge, and Lakewood at 0024 AM.

NWS extends Small Stream Flood Advisory for Fourmile burn area at 0324 AM.

Red Flood Alert issued for Douglas County, central Arapahoe County, and southeast Aurora at 0350 AM.

Red Flood Alert issued for Denver County (Cherry Creek bike paths) at 0942 AM.

Rainfall alarms activated in Jefferson County: 200 Leyden Res 0.51"/10-min, 200 Leyden Res 1.02"/1-hr.

Rainfall alarms activated in Douglas County: 5720 Four Mile Creek 0.51"/30-min, 2840 Sulphur Gulch 1.02"/1-hr, 2840 Sulphur Gulch 0.55"/10-min, 2730 Salisbury Park 0.51"/10-min, 5720 Four Mile Creek 0.79"/1-hr.

Rainfall alarms activated in Arapahoe County: 940 Sampson Gulch 0.51"/10-min.

Rainfall alarms activated in Boulder County: 4170 Pine Brook 0.31"/1-hr, 4230 Golden Age 0.28"/1-hr, 4160 Sunshine 0.28"/1-hr, 4190 Slaughterhouse 0.28"/1-hr, 4180 Golden Lake 0.28"/1-hr, 4130 Swiss Peak 0.28"/1-hr, 4850 Porphyry Mt 0.25"/1-hr, 4140 Logan Mill 0.28"/1-hr, 4080 Twin Sisters 0.28"/1-hr, 4150 Gold Hill 0.28"/1-hr, 4240 Sunset 0.28"/1-hr, 4090 Magnolia 0.28"/1-hr, 4010 Crescent 0.28"/1-hr.

X X X       X  

11

30-JUN 0.47" 0.70" 1.33"    

Message 1 issued for Douglas County, Arapahoe County, Aurora and Adams County at 2148.

NWS issued Severe Thunderstorm Warning at 2211 for southeast portion of the District.

No rainfall alarms activated.

X
X
X
X
X

12

02-JUL 0.24" 0.25" 1.56"    

Message 1 issued for entire District at 1428.

No rainfall alarms activated.

X
X

13

05-JUL 0.24" 0.45" 0.52"    

Message 2 issued for Fourmile Burn area at 0759. Message 2 issued for entire District at 1112.

NWS issued Flash Flood Watch for Fourmile Burn and District.

No District rainfall alarms were triggered.

               

14

06-JUL 1.42" 2.05" 1.56"  Table  Map

Message 2 issued for Fourmile Burn area at 0755. Message 1 issued for entire District at 1253.

RFA issued for Adams Co at 1708. RFA issued for Douglas Co at 1801. RFA issued for Arapahoe Co and Aurora at 1809.

NWS issued Flash Flood Watch for Fourmile Burn. NWS issued Severe Thunderstorm Warning for northeast portion of the District at 1727.

Rainfall alarms triggered at 0.5"/10-min in Douglas County (3050, 3090) and in the Hayman Burn area (5810).

Rainfall alarms triggered at 1.0"/1-hr in Douglas County (3070, 3090).

X
X
X
 
X
 
X
X

15

07-JUL 3.39" 3.39" 3.23"  Table  Map

Message 1 issued for entire District at 1212.

RFA issued for Boulder County, Jefferson County, Broomfield County, Arvada, Lakewood, Denver County, Douglas County, Adams County, Wheat Ridge, Arapahoe County, Aurora at between 1610 and 1652. RFA issued for DIA at 1713.

Message 3 issued for Denver County, southwest Adams County, northwest Adams County and central Arapahoe County at 1721.

RFA issued for Boulder County at 1748. RFA issued for Fourmile Burn area at 1823.

NWS issued Severe Thunderstorm Warning for northwest portion of the District at 1612 and for central portion of the District at 1710. NWS issued Flash Flood Warning for central portion of the District at 1716. NWS issued Flash Flood Warning for Fourmile Burn area at 1819.

Rainfall alarms exceeding 0.5"/10-min: Jefferson County (2280, 200, 320, 100), Denver County (1360, 1330, 1460, 530, 540, 1720, 1480), Adams County (400, 1310, 1300, 500, 800), Arapahoe County (700, 420, 510, 430, 520, 810, 820, 440, 710, 920, 830), Boulder County (4570, 4080, 4130, 4730, 4340).

Rainfall alarms exceeding 1.0"/1-hr: Jefferson County (200), Denver County (1360, 1330, 1460, 1320, 1420, 1700, 530, 1320, 540, 1480,1720), Adams County (400, 500, 1310, 800, 1300, 1800, 860, 850), Arapahoe County (700, 420, 510, 920, 430, 810, 820, 520, 710), Boulder County (4570, 4730, 4130)

More than 70 rainfall alarms were triggered District-wide.

Interesting to note that the radar rainfall estimates were less than observed on the ground.

X
X
X
X
X
X
X
X

16

08-JUL 1.73" 2.41" 2.23"  Table  Map

Message 1 issued for the entire District at 1252.

RFA issued for Jefferson County, Broomfield County, Adams County, Denver County, Arvada, Lakewood and Wheat Ridge at 1325. RFA issued for DIA at 1358.

RFA issued for Jefferson County, Broomfield County, Adams County, Arvada, Lakewood and Wheat Ridge at 1900. RFA issued for DIA at 1945.

NWS issued Severe Thunderstorm Warning for central and north central portion of the District at 1326 and for northeast portion of the District at 1349. NWS issued Severe Thunderstorm Warning for eastern portion of the District at 1410.

NWS issued Severe Thunderstorm Warning for central and north central portion of the District at 1905.

Rainfall alarms exceeding 0.5"/10-min: Boulder County (1200), Adams County (1900), Jefferson County (2240) and Denver County (1330).

Rainfall alarms exceeding 1.0"/1-hr: Boulder County (1200) and Jefferson County (2240).

X
X
X
X
X
X
X
X

17

09-JUL 1.26" 1.29" 1.33"  Table  Map

Message 1 issued for the entire District at 1544.

NWS issued Severe Thunderstorm Watch for central and eastern portion of the District at 1752.

Rainfall alarms exceeding 0.5"/10-min occured in Boulder County (1100-Louisville Dwy D and 4750-Louisville Lake).

     
X
X
 
X
X

18

10-JUL 0.63" 0.85" 0.93"  Table  Map

Message 1 issued for Boulder Co, Jefferson Co, Douglas Co and Fourmile Burn at 1358.

NWS issues Severe Thunderstorm Warning at 1422 for northern portion of the District and at 1530 for extreme southeast portion of the District.

RFA issued for Boulder Co at 1725.

Rainfall alarms exceeding 0.5"/10-min occured in Boulder County (4350).

     
X
X
 
X
X

19

11-JUL 1.22" 1.36" 2.05"  Table  Map

Message 1 issued for Boulder Co, FMC, Jefferson Co, Douglas Co at 1253. Message 1 issued for entire District at 1333.

Red Flood Alert issued for Douglas Co at 1426.

NWS issues Severe Thunderstorm Warning at 1454 for northeast Douglas Co.

Rainfall alarms exceeding 0.5"/10-min occured in Boulder Co (4520) and Douglas Co (2750).

Rainfall alarms exceeding 1.0"/1-hr occured in Boulder Co (4520).

X
X
X
X
X
X
X
X

20

12-JUL 1.46" 1.97" 2.53"  Table  Map

Message 2 issued for entire District at 0804.

NWS issues Flash Flood Watch for entire District at 0350.

Red Flood Alert issued for: Arapahoe Co, Aurora and Adams Co at 1704, Douglas Co at 2045, Central Jefferson Co, Lakewood and Wheat Ridge at 2051, Denver Co at 2102.

Rainfall alarms exceeding 0.5"/10-min occured in Arapahoe Co, Denver Co, Jefferson Co, Douglas Co, Adams Co, Boulder Co and Weld Co.

Rainfall alarms exceeding 1.0"/1-hr occured in Douglas Co, Denver Co, Adams Co and Jefferson Co.

X
X
X
X
X
X
X
X

21

13-JUL 1.61" 2.00" 2.68"  Table  Map

Message 1 issued for Jefferson Co and Douglas Co at 1635. Message 1 issued for entire District at 1721.

Red Flood Alert issued for: central Jefferson Co, Lakewood, Wheat Ridge and Denver Co at 1755, Adams Co at 2042, Arapahoe Co and Aurora at 2052, central Jefferson Co, Lakewood, Wheat Ridge and Denver Co at 2105, Douglas Co and Adams Co at 2115, Denver Co and DIA at 2124.

NWS issues Severe Thunderstorm Warning at 1757 for central portion of the District. NWS issues Flash Flood Warning for FMC at 1818. NWS issues Severe Thunderstorm Warning for south central portion of the District at 2106.

Message 3 issued for FMC at 1819.

Rainfall alarms exceeding 0.5"/10-min occured in Arapahoe Co, Jefferson Co, Douglas Co and Boulder Co.

Rainfall alarms exceeding 1.0"/1-hr occured in Douglas Co, Boulder Co, Arapahoe Co and Weld Co.

X
X
X
X
X
X
X
X

22

14-JUL 1.69" 1.63" 2.91"  Table  Map

NWS issues Flash Flood Watch for entire District at 0526. NWS issues Flash Flood Warning for FMC at 1300. NWS issues Severe Thunderstorm Warning for central District at 1441 and northern District at 1529.

Message 2 issued for entire District at 0841.

Message 3 issued for FMC at 1303 and for central portion of the District at 1530.

Rainfall alarms exceeding 0.5"/10-min occured in Jefferson Co, Arapahoe Co, Denver Co, Douglas Co and Boulder Co.

Rainfall alarms exceeding 1.0"/1-hr occured in Jefferson Co, Arapahoe Co and Denver Co.

X
X
X
X
 
X
X
X

23

15-JUL 0.47" 0.47" 0.79"    

Message 1 issued for Jefferson Co, Denver Co, DIA, Adams Co, Broomfield Co, Boulder Co and FMC at 1941.

No rainfall alarms exceeding 0.5"/10-min or 1.0"/1-hr.

X
             

24

16-JUL 0.45" 0.38" 0.53"  Table  Map

Message 1 issued for Boulder Co and FMC at 1452.

Messate 3 issued for FMC at 1551.

No rainfall alarms exceeding 0.5"/10-min or 1.0"/1-hr.

               

25

17-JUL 0.83" 1.48" 1.55"  Table  Map

Message 1 issued for Boulder Co, Jefferson Co, Douglas Co, and FMC at 1201.

NWS issues Flash Flood Warning for south central Boulder Co at 1744.

Rainfall alarms exceeding 0.5"/10-min did occur in Boulder Co.

     
X
       

26

18-JUL 0.04" 0.07" 0.35"    

Message 1 issued for FMC at 1402.

No rainfall alarms were recorded.

               

27

19-JUL 1.38" 1.40" 1.56"  Table  Map

Message 2 issued for FMC at 1130. NWS issues Flash Flood Watch for FMC at 1114.

Message 1 issued for Boulder Co, Jefferson Co, Douglas Co at 1309, Broomfield Co and Adams Co at 1536, Denver Co, DIA, Arapahoe Co and Aurora at 1556.

Message 3 issued for FMC at 1530.

Red Flood Alert issued for Jefferson Co, Arvada and Adams Co at 1632, Broomfield Co at 1701, Lakewood, Wheat Ridge and Douglas Co at 1717, and Denver Co, Arapahoe Co and Aurora at 1753.

Rainfall alarms exceeding 0.5"/10-min were recorded at Marston Lake and in Boulder Co and Adams Co.

X
   
X
 
X
X
X

28

26-JUL 0.75" 0.98" 1.04"  Table  Map

Message 1 issued for Boulder Co, Broomfield Co, Adams Co at 1848.

Red Flood Alert issued for northern Jefferson Co, and Arvada at 1848.

Rainfall alarms exceeding 0.5"/10-min were recorded in Douglas County and Teller County.

 
X
       
X
X

29

27-JUL 1.14" 0.97" 1.03"  Table  Map

Message 1 issued for Boulder Co, Jefferson Co, Broomfield Co, Douglas Co, Adams Co, Denver Co, DIA, Arapahoe Co, Aurora and FMC at 1748.

Rainfall alarms exceeding 0.5"/10-min and 1"/1-hr were recorded in Douglas County.

     
X
   
X
X

30

31-JUL 0.28" 0.38" 0.40"    

Message 1 issued for Boulder Co and FMC at 1904.

Rainfall alarms were not triggered on this day.

               

31

02-AUG 0.79" 0.87" 1.83"  Table  Map

Message 2 issued for FMC, Boulder Co, Jefferson Co, and Douglas Co at 0830.

Message 1 issued for the remainder of the District at 1225.

Message 3 issued for southeast Jefferson Co and west Douglas Co at 1418.

Rainfall alarms exceeding 0.5"/10-min were recorded in west Douglas County.

 
X
X
X
   
X
X

32

03-AUG 0.91" 1.92" 1.82"  Table  Map

Message 1 issued for the entire District at 1608.

Red Flood Alert issued for Douglas Co, south central Jefferson Co, and western Arapahoe Co at 1714.

Red Flood Alert issued for Adams Co and DIA at 1905.

Rainfall alarms exceeding 0.5"/10-min were recorded in Denver Co, DIA and the Hayman Burn area.

X
       
X
X
X

33

04-AUG 0.83" 0.44" 1.39"  Table  Map

Message 1 issued for Douglas Co at 1540.

Message 1 issued for Boulder Co and FMC at 1635.

Red Flood Alert issued for Boulder Co and FMC at 1658.

Rainfall alarms exceeding 0.5"/10-min were recorded in Douglas County.

           
X
 

34

14-AUG 0.35" 0.46" 0.61"  Table  Map

Message 1 issued for FMC at 1454.

Rainfall alarms exceeding 0.25"/1-hour were recorded in Boulder County.

           
X
 

35

16-AUG 0.91" 0.94" 1.51"  Table  Map

Message 1 issued for Douglas Co at 1440.

Message 1 issued for FMC, Boulder Co, Jefferson Co and Broomfield at 1554.

Rainfall alarms exceeding 0.5"/10-min were recorded in Douglas County.

     
X
   
X
X

36

20-AUG 0.87" 1.15" 2.14"  Table  Map

Message 1 issued for Douglas Co at 2044.

Rainfall alarms exceeding 1"/90-min were recorded in the Hayman Burn region of Douglas County.

X
         
X
 

37

21-AUG 0.28" 0.30" 1.36"    

Message 1 issued for Jefferson Co, Douglas Co, Boulder Co and FMC at 1450.

Message 1 issued for Adams Co, Arapahoe Co and City of Aurora at 1555.

Red Flood Alert issued for Adams Co at 1659.

Rainfall alarms exceeding 0.5"/10-min were recorded in Douglas County. Rainfall alarms exceeding 0.3"/1-hour were recorded in Boulder County. Rainfall alarms exceeding 1"/90-min were recorded in the Hayman Burn area of Douglas County.

X

 

 

 

 

 

 

X

 

 

38

29-AUG 0.28" 0.18" 0.81"    

Message 1 issued for Douglas Co and Jefferson Co at 1252.

Message 1 issued for Denver Co at 1752.

Rainfall alarms were not triggered for this event.

 

 

 

 

 

 

X

 

 

39

02-SEP 0.71" 0.68" 2.07"  Table  Map

Message 1 issued for Adams Co, Denver Co, DIA at 451.

Message 1 issued for Arapahoe Co and Aurora at 718.

Message 1 issued for Douglas Co at 729.

Rainfall alarms exceeding 0.5"/10-min were recorded in Douglas County.

X
X
X

 

 

X
X
X

40

14-SEP

Basin Average Sample

1.65" 1.67" 2.68" Table   Map

Message 1 issued for Boulder Co and FMC at 728.

Rainfall alarms exceeding 0.25"/1-hr were recorded in Boulder County.

X
X
X
X
X
X
X
X

 

 

Maximum 24-hour value

Maximum 24-hour value

Maximum

Radar

estimated

24-hour

precip

   

 

ADAM

ARAP

AURA

BLDR

BROM

DOUG

DENV

JEFF