Alert archive / Colorado / Flash Flood Warnings in 2011
Flash Flood Warning 8, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 7, 2011, 6:27 PM MDT for Boulder County, Gilpin County, Jefferson County, Colorado. It was in force for 3 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 7, 2011, 6:27 PM MDT (00:27 UTC)
- Expired
- Jul 7, 2011, 9:30 PM MDT
- In force
- 3 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Boulder County, CO, Gilpin County, CO, Jefferson County, CO
The radar
The Denver radar (KFTG), 73 km from the middle of the area, began a volume at 00:27 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, 0.5 hours before the alert went out and 183 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
- 259 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 1195 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
133 WGUS55 KBOU 080027 FFWBOU COC013-047-059-080330- /O.NEW.KBOU.FF.W.0008.110708T0027Z-110708T0330Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DENVER CO 627 PM MDT THU JUL 7 2011 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHWESTERN JEFFERSON COUNTY IN NORTHEAST COLORADO NORTHEASTERN GILPIN COUNTY IN CENTRAL COLORADO SOUTH CENTRAL BOULDER COUNTY IN NORTHEAST COLORADO * UNTIL 930 PM MDT * AT 624 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM 3 MILES NORTH OF PINECLIFFE...OR 29 MILES NORTHWEST OF DENVER. THUNDERSTORMS CONTINUE TO DEVELOP OVER THE AREA AND ADDITIONAL RAINFALL IS EXPECTED. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ORODELL... PINECLIFFE AND ASPEN SPRINGS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. TURN AROUND...DO NOT DROWN. RADAR ESTIMATES INDICATES 1.5 TO 2.5 INCHES OF RAIN HAS FALLEN SINCE 4 PM...HEAVIEST 2 MILES SOUTHWEST OF ROLLINS AND 4 MILES NORTHEAST OF NEDERLAND. THE HEAVY RAINS COULD ALSO TRIGGER ROCK SLIDES OR DEBRIS FLOWS IN STEEP TERRAIN. && LAT...LON 4003 10529 3983 10533 3982 10549 4002 10546 $$
1 follow-up statement
826 WGUS75 KBOU 080326 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 926 PM MDT THU JUL 7 2011 COC013-047-059-080334- /O.EXP.KBOU.FF.W.0008.000000T0000Z-110708T0330Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ JEFFERSON CO-GILPIN CO-BOULDER CO- 926 PM MDT THU JUL 7 2011 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 930 PM MDT FOR SOUTH CENTRAL BOULDER...NORTHEASTERN GILPIN AND NORTHWESTERN JEFFERSON COUNTIES... THE STORM THAT PROMPTED THE WARNING HAS EXITED THE AREA. THERE WILL STILL BE SCATTERED SHOWERS AND THUNDERSTORMS UNTIL MIDNIGHT...BUT OVERALL RAINFALL RATES WILL BE UP TO A THIRD OF AN INCH PER HOUR OR LESS. THE STORMS ARE ALSO MOVING QUICKLY ENOUGH TO RESULT IN A LOWER THREAT OF FLASH FLOODING. LAT...LON 4003 10529 3983 10533 3982 10549 4002 10546 $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 6:07 PM MDT | Areal Flood Advisory | BOU | Boulder, Gilpin, Jefferson | 83 min |
| Jul 7, 6:18 PM MDT | Flash Flood Warning | BOU | Boulder | 3 hr |
| Jul 7, 6:35 PM MDT | Areal Flood Advisory | BOU | Larimer | 85 min |
| Jul 7, 7:28 PM MDT | Areal Flood Advisory | BOU | Boulder | 2 hr |
| Jul 7, 7:38 PM MDT | Areal Flood Advisory | BOU | Adams, Arapahoe, Denver | 2 hr |
| Jul 7, 8:02 PM MDT | Flash Flood Warning | BOU | Clear Creek, Gilpin | 97 min |
| Jul 7, 10:05 PM MDT | Areal Flood Advisory | BOU | Adams, Arapahoe, Denver | 4 hr |
| Jul 7, 10:27 PM MDT | River Flood Advisory | BOU | Adams | 14 hr |
| Jul 8, 1:21 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Broomfield, Denver, Jefferson | 39 min |
| Jul 8, 1:46 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Denver | 44 min |
| Jul 8, 2:07 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 34 min |
| Jul 8, 4:11 PM MDT | Severe Thunderstorm Warning | BOU | Elbert, Lincoln | 49 min |
| Jul 8, 4:39 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 24 min |
| Jul 8, 4:57 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 16 min |
| Jul 8, 5:11 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 21 min |
| Jul 8, 5:20 PM MDT | Areal Flood Advisory | BOU | Summit | 4 days |
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.