Alert archive / Colorado / Flash Flood Warnings in 2011
Flash Flood Warning 18, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 13, 2011, 12:16 AM MDT for Weld 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 13, 2011, 12:16 AM MDT (06:16 UTC)
- Expired
- Jul 13, 2011, 3:15 AM MDT
- In force
- 3 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Weld County, CO
The radar
The Cheyenne radar (KCYS), 53 km from the middle of the area, began a volume at 06:17 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, 6.3 hours before the alert went out and 143 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
- 596 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 1449 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 256 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.2
The text
As transmitted, in the capitals the NWS used until 2016.
145
WGUS55 KBOU 130616
FFWBOU
COC123-130915-
/O.NEW.KBOU.FF.W.0018.110713T0616Z-110713T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
1216 AM MDT WED JUL 13 2011
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHERN WELD COUNTY IN NORTHEAST COLORADO
* UNTIL 315 AM MDT
* AT 1211 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM A THUNDERSTORM 7 MILES EAST OF PAWNEE
BUTTES...OR 36 MILES WEST OF STERLING. THIS STORM WAS MOVING
NORTHEAST AT 30 MPH.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NATURAL
FORT...ROCKPORT...PURCELL...PIERCE...PAWNEE BUTTES...NUNN...
KEOTA...HEREFORD...GROVER...CARR...BRIGGSDALE AND AULT.
DOPPLER RADAR ESTIMATES THAT BETWEEN 2 AND 5 INCHES OF RAIN HAS
FALLEN ACROSS MOST OF NORTHERN WELD COUNTY...WITH THE HEAVIEST
RAINFALL EAST OF HIGHWAY 85 AND NORTH OF HIGHWAY 14.
A CITIZEN REPORTED WATER WASHING OVER A ROAD NEAR COUNTY ROAD 100
AND COUNTY ROAD 27 NORTHWEST OF NUNN. EARLIER...FLOODING WAS ALSO
REPORTED AT COUNTY ROAD 100 AND COUNTY ROAD 77.
THIS FLASH FLOOD WARNING ALSO INCLUDES THE FOLLOWING STREAMS...
COAL BANK CREEK...WILD HORSE CREEK...WILLOW CREEK...CROW
CREEK...NORTH PAWNEE CREEK...SPRING CREEK...AND TWO MILE CREEK.
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.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY
IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
&&
LAT...LON 4100 10358 4067 10358 4052 10454 4056 10495
4066 10495 4067 10494 4075 10494 4099 10493
$$
BARJENBRUCH2 follow-up statements
708
WGUS75 KBOU 130715
FFSBOU
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
115 AM MDT WED JUL 13 2011
COC123-130915-
/O.CON.KBOU.FF.W.0018.000000T0000Z-110713T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WELD CO-
115 AM MDT WED JUL 13 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM MDT FOR
NORTHERN WELD COUNTY...
AT 113 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE
HEAVIEST RAIN WAS MOVING OUT OF NORTHERN WELD COUNTY.
DOPPLER RADAR ESTIMATES THAT BETWEEN 2 AND 5 INCHES OF RAIN FELL
ACROSS MOST OF NORTHERN WELD COUNTY EARLIER TONIGHT...WITH THE
HEAVIEST RAINFALL EAST OF HIGHWAY 85 AND NORTH OF HIGHWAY 14.
A CITIZEN REPORTED WATER WASHING OVER A ROAD NEAR COUNTY ROAD 100
AND COUNTY ROAD 27 NORTHWEST OF NUNN. EARLIER...FLOODING WAS ALSO
REPORTED AT COUNTY ROAD 100 AND COUNTY ROAD 77.
LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
NATURAL FORT...ROCKPORT...PURCELL...PIERCE...PAWNEE
BUTTES...NUNN...KEOTA...HEREFORD...GROVER...CARR...BRIGGSDALE AND
AULT.
THIS FLASH FLOOD WARNING ALSO INCLUDES THE FOLLOWING STREAMS...COAL
BANK CREEK...WILD HORSE CREEK...WILLOW CREEK...CROW CREEK...NORTH
PAWNEE CREEK...SPRING CREEK...AND TWO MILE CREEK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY
IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS
BRIDGES...DIPS...OR OTHER LOW SPOTS IF WATER COVERS THE ROADWAY.
NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO
ESCAPE RISING WATER CLIMB TO HIGHER GROUND.
&&
LAT...LON 4100 10358 4067 10358 4052 10454 4056 10495
4066 10495 4067 10494 4075 10494 4099 10493
$$
BARJENBRUCH296
WGUS75 KBOU 130915
FFSBOU
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
315 AM MDT WED JUL 13 2011
COC123-130919-
/O.EXP.KBOU.FF.W.0018.000000T0000Z-110713T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WELD CO-
315 AM MDT WED JUL 13 2011
...THE FLASH FLOOD WARNING WILL EXPIRE AT 315 AM MDT FOR NORTHERN
WELD COUNTY...
THE STORMS THAT PROMPTED THE WARNING HAVE EXITED THE AREA.
THUNDERSTORMS THAT FORMED TUESDAY AFTERNOON AND EVENING PRODUCED
BETWEEN 2 AND 5 INCHES OF RAINFALL ACROSS NORTHERN WELD COUNTY.
THERE HAVE BEEN SEVERAL REPORTS OF FLOODED OR DAMAGED ROADS AROUND
RURAL NORTHERN WELD COUNTY. AREAS THAT WERE HARDEST HIT BY THE HEAVY
RAIN STRETCHED FROM NUNN NORTHEAST TO GROVER AND TO THE NORTH OF NEW
RAYMER.
MOTORISTS SHOULD CONTINUE TO USE CAUTION IF THEY ENCOUNTER ROADWAYS
UNDER WATER. ROAD BEDS MAY BE WASHED OUT AND IT WILL BE DIFFICULT TO
ESTIMATE THE DEPTH OF STANDING OR FLOWING WATER.
LAT...LON 4100 10358 4067 10358 4052 10454 4056 10495
4066 10495 4067 10494 4075 10494 4099 10493
$$The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 6:34 PM MDT | Flash Flood Warning | BOU | Arapahoe, Elbert | 2 hr |
| Jul 12, 6:39 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Elbert | 51 min |
| Jul 12, 7:03 PM MDT | Tornado Warning | BOU | Elbert | 42 min |
| Jul 12, 7:19 PM MDT | Flash Flood Warning | BOU | Arapahoe, Elbert | 91 min |
| Jul 12, 7:23 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 52 min |
| Jul 12, 7:27 PM MDT | Tornado Warning | BOU | Elbert | 48 min |
| Jul 12, 7:34 PM MDT | Tornado Warning | BOU | Weld | 41 min |
| Jul 12, 7:45 PM MDT | Tornado Warning | BOU | Elbert | 45 min |
| Jul 12, 7:48 PM MDT | Areal Flood Advisory | BOU | Weld | 87 min |
| Jul 12, 8:05 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 40 min |
| Jul 12, 8:17 PM MDT | Tornado Warning | BOU | Elbert | 43 min |
| Jul 12, 8:21 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 54 min |
| Jul 12, 8:33 PM MDT | Flash Flood Warning | BOU | Arapahoe, Elbert | 3 hr |
| Jul 12, 8:44 PM MDT | Flash Flood Warning | BOU | Weld | 2 hr |
| Jul 12, 9:00 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 60 min |
| Jul 12, 9:04 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 56 min |
| Jul 12, 9:10 PM MDT | Tornado Warning | BOU | Weld | 34 min |
| Jul 12, 9:15 PM MDT | Areal Flood Advisory | BOU | Adams, Arapahoe, Denver, Jefferson | 90 min |
| Jul 12, 9:30 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 44 min |
| Jul 12, 9:40 PM MDT | Areal Flood Advisory | BOU | Boulder | 95 min |
| Jul 12, 9:59 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 61 min |
| Jul 12, 10:35 PM MDT | Areal Flood Advisory | BOU | Larimer, Weld | 115 min |
| Jul 12, 10:48 PM MDT | Flash Flood Warning | BOU | Weld | 3 hr |
| Jul 12, 10:54 PM MDT | Flash Flood Warning | BOU | Larimer | 2 hr |
| Jul 12, 11:19 PM MDT | Areal Flood Warning | BOU | Arapahoe, Elbert | 6 hr |
| Jul 13, 12:04 AM MDT | River Flood Advisory | BOU | Adams | 10 hr |
| Jul 13, 12:32 AM MDT | River Flood Advisory | BOU | Weld | 47 hr |
| Jul 13, 12:37 AM MDT | Areal Flood Advisory | BOU | Weld | 83 min |
| Jul 13, 1:11 AM MDT | Areal Flood Advisory | BOU | Logan | 94 min |
| Jul 13, 2:01 PM MDT | Special Weather Statement | BOU | Elbert | 29 min |
| Jul 13, 2:22 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 38 min |
| Jul 13, 2:42 PM MDT | Areal Flood Advisory | BOU | Elbert | 93 min |
| Jul 13, 2:58 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 38 min |
| Jul 13, 3:52 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 38 min |
| Jul 13, 4:22 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 16 min |
| Jul 13, 5:08 PM MDT | Special Weather Statement | BOU | Jefferson | 52 min |
| Jul 13, 5:53 PM MDT | Areal Flood Advisory | BOU | Boulder | 82 min |
| Jul 13, 5:56 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver, Douglas, Jefferson | 49 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.