Alert archive / Colorado / Flash Flood Warnings in 2011
Flash Flood Warning 20, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 13, 2011, 8:08 PM MDT for Boulder County, Colorado. It was in force for 103 min. 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 13, 2011, 8:08 PM MDT (02:08 UTC)
- Expired
- Jul 13, 2011, 9:51 PM MDT
- In force
- 103 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Boulder County, CO
The radar
The Denver radar (KFTG), 73 km from the middle of the area, began a volume at 02:09 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, 2.1 hours before the alert went out and 180 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
- 856 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 2153 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- -31 m²/s²
- 0-3 km storm-relative helicity
- 110 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.0
The text
As transmitted, in the capitals the NWS used until 2016.
013
WGUS55 KBOU 140208
FFWBOU
COC013-140500-
/O.NEW.KBOU.FF.W.0020.110714T0208Z-110714T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
808 PM MDT WED JUL 13 2011
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL BOULDER COUNTY IN NORTHEAST COLORADO
* UNTIL 1100 PM MDT
* AT 806 PM MDT...FLASH FLOODING WAS OBSERVED ALONG FOURMILE CREEK.
THE CREST OF THE FLOOD WATERS WAS REACHING BOULDER CREEK...WITH
A RAPID SURGE AND INCREASE OF AT LEAST 4 FEET OF WATER.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WALLSTREET...SUNSHINE...SUMMERVILLE...SALINA...ORODELL...CRISMAN...
AND GOLD HILL.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A LIFE THREATENING SITUATION. HEAVY RAINFALL WILL CAUSE
EXTENSIVE AND SEVERE FLASH FLOODING OF CREEKS...STREAMS...AND DITCHES
IN THE FOURMILE BURN AREA. SOME DRAINAGE BASINS IMPACTED INCLUDE
FOURMILE CREEK...GOLD RUN...AND FOURMILE CANYON CREEK. SEVERE DEBRIS
FLOWS CAN ALSO BE ANTICIPATED ACROSS ROADS. ROADS AND DRIVEWAYS MAY
BE WASHED AWAY IN PLACES.
THIS WARNING ALSO INCLUDES BOULDER CREEK FROM FOURMILE CREEK
DOWNSTREAM TO THE CANYON MOUTH WEST OF BOULDER.
IF YOU ENCOUNTER FLOOD WATERS...CLIMB TO SAFETY.
&&
LAT...LON 4009 10536 4008 10530 4007 10527 4004 10527
4000 10525 4000 10532 4002 10540 4005 10544
$$
BARJENBRUCH2 follow-up statements
360
WGUS75 KBOU 140259
FFSBOU
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
859 PM MDT WED JUL 13 2011
COC013-140500-
/O.CON.KBOU.FF.W.0020.000000T0000Z-110714T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BOULDER CO-
859 PM MDT WED JUL 13 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 PM MDT FOR
CENTRAL BOULDER COUNTY...
SIGNIFICANT FLASH FLOODING WAS OBSERVED EARLIER THIS EVENING IN THE
FOURMILE BURN AREA AND ALONG FOURMILE CREEK DOWN TO BOULDER CREEK.
THE CREST OF THE FLOOD WATERS WAS NOW MOVING EASTWARD THROUGH THE
CITY OF BOULDER...WITH A SLOW DECREASE IN FLOWS EXPECTED THROUGH THE
COURSE OF THE EVENING. WHILE NO SIGNIFICANT FLASH FLOODING WAS
OBSERVED IN BOULDER...SOME TRAILS AND BIKE PATHS ALONG BOULDER CREEK
MAY BE FLOODED IN TOWN.
THERE WERE REPORTS FROM EARLIER THIS EVENING OF 3 TO 4 FEET OF WATER
RUNNING OVER THE ROAD NEAR THE JUNCTION OF FOURMILE CANYON ROAD AND
GOLD RUN ROAD. SOME HOMES HAD WATER UP TO THE WINDOWS AT THAT
LOCATION AS WELL. THOSE FLOOD WATERS HAVE SUBSIDED. HOWEVER...MANY
ROADS AND DRIVEWAYS MAY BE WASHED OUT.
LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WALLSTREET...SUNSHINE...SUMMERVILLE...SALINA...ORODELL...CRISMAN...
AND GOLD HILL.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A LIFE THREATENING SITUATION. HEAVY RAINFALL HAS CAUSED
EXTENSIVE AND SEVERE FLASH FLOODING OF CREEKS...STREAMS...AND DITCHES
IN THE FOURMILE BURN AREA. SOME DRAINAGE BASINS IMPACTED INCLUDE
FOURMILE CREEK...GOLD RUN...AND FOURMILE CANYON CREEK. SEVERE DEBRIS
FLOWS CAN ALSO BE ANTICIPATED ACROSS ROADS. ROADS AND DRIVEWAYS HAVE
BEEN WASHED AWAY IN PLACES...AND TRAVEL MAY BE IMPOSSIBLE IN THE
FOURMILE BURN AREA.
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 4009 10536 4008 10530 4007 10527 4004 10527
4000 10525 4000 10532 4002 10540 4005 10544
$$
BARJENBRUCH194
WGUS75 KBOU 140351
FFSBOU
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
951 PM MDT WED JUL 13 2011
COC013-140357-
/O.CAN.KBOU.FF.W.0020.000000T0000Z-110714T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BOULDER CO-
951 PM MDT WED JUL 13 2011
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL BOULDER
COUNTY...
ALL STREAMS INCLUDING FOURMILE CREEK AND BOULDER CREEK WERE RECEDING
QUICKLY AND RETURNING TO NORMAL FLOWS.
BOULDER COUNTY EMERGENCY MANAGEMENT REPORTED NUMEROUS ROADS AND
DRIVEWAYS IN THE FOURMILE BURN AREA AND ALONG FOURMILE CREEK WERE
WASHED OUT EARLIER THIS EVENING. NUMEROUS DEBRIS FLOWS HAVE ALSO
OCCURRED. TRAVEL MAY BE IMPOSSIBLE IN THE BURN AREA AND IS NOT
RECOMMENDED.
THERE IS STILL A CHANCE OF THUNDERSTORMS INTO THE EARLY MORNING
HOURS...SO RESIDENTS AND EMERGENCY OFFICIALS ARE URGED TO REMAIN
ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS.
LAT...LON 4009 10536 4008 10530 4007 10527 4004 10527
4000 10525 4000 10532 4002 10540 4005 10544
$$
BARJENBRUCHThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 6:17 PM MDT | Flash Flood Warning | BOU | Boulder | 3 hr |
| Jul 13, 6:32 PM MDT | Areal Flood Advisory | BOU | Adams, Arapahoe, Denver, Jefferson | 43 min |
| Jul 13, 6:40 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver, Jefferson | 19 min |
| Jul 13, 6:54 PM MDT | Areal Flood Advisory | BOU | Grand | 22 hr |
| Jul 13, 7:13 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Larimer | 34 min |
| Jul 13, 7:34 PM MDT | Severe Thunderstorm Warning | BOU | Larimer | 26 min |
| Jul 13, 7:59 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 28 min |
| Jul 13, 8:37 PM MDT | Areal Flood Advisory | BOU | Boulder | 75 min |
| Jul 13, 9:01 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Jefferson | 44 min |
| Jul 13, 9:05 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 55 min |
| Jul 13, 9:28 PM MDT | Areal Flood Advisory | BOU | Adams, Arapahoe, Broomfield, Denver, Douglas, Jefferson | 77 min |
| Jul 13, 9:55 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 33 min |
| Jul 13, 10:58 PM MDT | Areal Flood Advisory | BOU | Arapahoe, Douglas | 92 min |
| Jul 13, 11:15 PM MDT | Flash Flood Warning | BOU | Boulder | 3 hr |
| Jul 13, 11:16 PM MDT | Flash Flood Warning | BOU | Boulder | 3 hr |
| Jul 13, 11:48 PM MDT | Areal Flood Advisory | BOU | Adams, Morgan, Washington | 87 min |
| Jul 14, 12:35 AM MDT | Areal Flood Advisory | BOU | Adams, Arapahoe, Morgan, Washington | 81 min |
| Jul 14, 5:25 AM MDT | Flash Flood Watch | BOU | Adams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver and 10 more | 16 hr |
| Jul 14, 11:03 AM MDT | Areal Flood Advisory | BOU | Morgan, Weld | 71 hr |
| Jul 14, 1:00 PM MDT | Flash Flood Warning | BOU | Boulder | 3 hr |
| Jul 14, 1:10 PM MDT | Special Weather Statement | BOU | Jefferson | 35 min |
| Jul 14, 1:48 PM MDT | Areal Flood Advisory | BOU | Douglas | 87 min |
| Jul 14, 1:57 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Elbert | 48 min |
| Jul 14, 2:09 PM MDT | Flash Flood Warning | BOU | Boulder | 2 hr |
| Jul 14, 2:40 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Denver, Douglas | 50 min |
| Jul 14, 3:02 PM MDT | Areal Flood Advisory | BOU | Arapahoe, Denver | 26 min |
| Jul 14, 3:22 PM MDT | Flash Flood Warning | BOU | Arapahoe, Denver, Jefferson | 2 hr |
| Jul 14, 3:28 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 47 min |
| Jul 14, 4:00 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 22 min |
| Jul 14, 4:16 PM MDT | Areal Flood Advisory | BOU | Arapahoe, Elbert | 89 min |
| Jul 14, 4:31 PM MDT | Areal Flood Advisory | BOU | Grand | 71 hr |
| Jul 14, 5:10 PM MDT | Areal Flood Advisory | BOU | Boulder | 55 min |
| Jul 14, 5:21 PM MDT | Special Weather Statement | BOU | Adams | 24 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.