Alert archive / Colorado / Flash Flood Warnings in 2011
Flash Flood Warning 11, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 8, 2011, 10:33 PM MDT for Washington County, Colorado. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 8, 2011, 10:33 PM MDT (04:33 UTC)
- Expired
- Jul 9, 2011, 2:30 AM MDT
- In force
- 4 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Washington County, CO
The radar
The Goodland radar (KGLD), 106 km from the middle of the area, began a volume at 04:35 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 4.6 hours before the alert went out and 39 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 112 J/kg
- Mixed-layer CIN
- -123 J/kg
- Mixed-layer LCL
- 2514 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- -124 m²/s²
- 0-3 km storm-relative helicity
- 12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted, in the capitals the NWS used until 2016.
824 WGUS55 KBOU 090433 FFWBOU COC121-090830- /O.NEW.KBOU.FF.W.0011.110709T0433Z-110709T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DENVER CO 1033 PM MDT FRI JUL 8 2011 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTHEASTERN WASHINGTON COUNTY IN NORTHEAST COLORADO * UNTIL 230 AM MDT * AT 1032 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM 5 MILES SOUTHWEST OF COPE...OR 40 MILES SOUTH OF AKRON. THIS STORM WAS MOVING NORTHEAST AT 15 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO COPE. DOPPLER RADAR ESTIMATES THAT AROUND 4 INCHES OF RAIN HAS FALLEN OVER EXTREME SOUTHEASTERN WASHINGTON COUNTY NEAR COPE THE PAST 90 MINUTES. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES AND ARROYOS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY AS THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE. TURN AROUND...DO NOT DROWN. && LAT...LON 3971 10280 3957 10281 3957 10300 3968 10297 $$
3 follow-up statements
324 WGUS75 KBOU 090512 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1112 PM MDT FRI JUL 8 2011 COC121-090830- /O.CON.KBOU.FF.W.0011.000000T0000Z-110709T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WASHINGTON CO- 1112 PM MDT FRI JUL 8 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 AM MDT FOR SOUTHEASTERN WASHINGTON COUNTY... AT 1108 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED HEAVY RAIN FROM A THUNDERSTORM NEAR COPE...OR ABOUT 38 MILES SOUTHEAST OF AKRON. THIS STORM WAS MOVING NORTHEAST AT 15 MPH. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO COPE. DOPPLER RADAR ESTIMATES THAT OVER 6 INCHES OF RAIN MAY HAVE FALLEN OVER EXTREME SOUTHEASTERN WASHINGTON COUNTY SINCE 9 PM NEAR COPE. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING ALONG THE ARIKAREE RIVER...HIGHWAY 36...SMALL CREEKS AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES AND ARROYOS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY AS THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE. TURN AROUND...DO NOT DROWN. && LAT...LON 3971 10280 3957 10281 3957 10300 3968 10297 $$
031 WGUS75 KBOU 090643 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1243 AM MDT SAT JUL 9 2011 COC121-090830- /O.CON.KBOU.FF.W.0011.000000T0000Z-110709T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WASHINGTON CO- 1243 AM MDT SAT JUL 9 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 AM MDT FOR SOUTHEASTERN WASHINGTON COUNTY... AT 1240 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SCATTERED THUNDERSTORMS MOVING EASTWARDS TOWARDS COPE. THESE THUNDERSTORMS COULD PRODUCE ADDITIONAL HEAVY RAIN OVER SOUTHEAST WASHINGTON COUNTY THROUGH 2 AM. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO COPE. DOPPLER RADAR ESTIMATES THAT OVER 6 INCHES OF RAIN MAY HAVE FALLEN EARLIER TONIGHT OVER SOUTHEAST WASHINGTON COUNTY NEAR COPE. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM PREVIOUS HEAVY RAINS WILL CAUSE FLASH FLOODING ALONG THE ARIKAREE RIVER...HIGHWAY 36...SMALL CREEKS AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES AND ARROYOS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY AS THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE. TURN AROUND...DO NOT DROWN. && LAT...LON 3971 10280 3957 10281 3957 10300 3968 10297 $$
192 WGUS75 KBOU 090838 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 238 AM MDT SAT JUL 9 2011 COC121-090848- /O.EXP.KBOU.FF.W.0011.000000T0000Z-110709T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WASHINGTON CO- 238 AM MDT SAT JUL 9 2011 ...THE FLASH FLOOD WARNING HAS EXPIRED FOR SOUTHEASTERN WASHINGTON COUNTY...HOWEVER A FLOOD ADVISORY HAS BEEN ISSUED UNTIL 530 AM MDT. LAT...LON 3971 10280 3957 10281 3957 10300 3968 10297 $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 6:04 PM MDT | Severe Thunderstorm Warning | BOU | Phillips, Sedgwick | 56 min |
| Jul 8, 6:10 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 31 min |
| Jul 8, 6:42 PM MDT | Areal Flood Advisory | BOU | Phillips, Sedgwick | 93 min |
| Jul 8, 7:04 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Broomfield, Denver, Jefferson | 45 min |
| Jul 8, 7:18 PM MDT | Areal Flood Advisory | BOU | Adams, Boulder, Broomfield, Jefferson, Weld | 3 hr |
| Jul 8, 8:11 PM MDT | Severe Thunderstorm Warning | BOU | Phillips, Sedgwick | 34 min |
| Jul 8, 9:03 PM MDT | Areal Flood Advisory | BOU | Phillips, Sedgwick | 61 min |
| Jul 8, 10:02 PM MDT | Flash Flood Warning | BOU | Phillips, Sedgwick | 6 hr |
| Jul 8, 11:49 PM MDT | River Flood Advisory | BOU | Weld | 5 hr |
| Jul 9, 12:02 AM MDT | Areal Flood Advisory | BOU | Larimer | 66 hr |
| Jul 9, 2:34 AM MDT | Areal Flood Advisory | BOU | Washington | 3 hr |
| Jul 9, 4:12 PM MDT | Special Weather Statement | BOU | Boulder | 63 min |
Nearby
Flash Flood Warnings in Colorado, 2011Every flash flood warning in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.