Alert archive / Colorado / Flash Flood Warnings in 2011
Flash Flood Warning 25, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 14, 2011, 3:22 PM MDT for Arapahoe County, Denver County, Jefferson County, Colorado. It was in force for 2 hr. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 14, 2011, 3:22 PM MDT (21:22 UTC)
- Expired
- Jul 14, 2011, 5:32 PM MDT
- In force
- 2 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Arapahoe County, CO, Denver County, CO, Jefferson County, CO
The radar
The Denver radar (KFTG), 34 km from the middle of the area, began a volume at 21:23 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 14, 3:30 PM MDT | FLOOD | 4 W Centennial, CO | SIGNIFICANT STREET FLOODING AND STANDING WATER OVER LOW LYING AREAS OF OVER ONE FOOT. |
| Jul 14, 3:35 PM MDT | FLOOD | 5 Se Denver, CO | CARS STRANDED IN STANDING WATER OVER TWO FEET OF WATER AT THE INTERSECTIONS OF COLORADO AND YALE AND COLORADO AND MAXWELL. |
| Jul 14, 3:38 PM MDT | FLOOD | 3 Ese Denver, CO | ONE FOOT OF WATER ON THE INTERSECTION OF ALEMEDA AND HOLLY OVERFLOWING FROM NEARBY DITCH. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 9.4 hours before the alert went out and 147 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
- 255 J/kg
- Mixed-layer CIN
- -304 J/kg
- Mixed-layer LCL
- 1170 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
733
WGUS55 KBOU 142122
FFWBOU
COC005-031-059-150015-
/O.NEW.KBOU.FF.W.0025.110714T2122Z-110715T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
322 PM MDT THU JUL 14 2011
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EAST CENTRAL JEFFERSON COUNTY IN NORTHEAST COLORADO
WESTERN ARAPAHOE COUNTY IN NORTHEAST COLORADO
SOUTHERN DENVER COUNTY IN NORTHEAST COLORADO
* UNTIL 615 PM MDT
* AT 320 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM A THUNDERSTORM NEAR ENGLEWOOD...OR 5 MILES
SOUTH OF DENVER. THIS STORM WAS MOVING NORTH AT 5 MPH.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SHERIDAN...
GREENWOOD VILLAGE...WESTERN CENTENNIAL...LITTLETON...SOUTHEASTERN
LAKEWOOD...ENGLEWOOD...DENVER AND WESTERN AURORA.
DOPPLER RADAR ESTIMATES THAT THIS STORM WILL PRODUCE UP TO 2 INCHES
OF RAIN IN A 30 TO 45 MINUTE PERIOD. AN AUTOMATED RAIN GAUGE IN
LITTLETON HAS ALREADY REPORTED 1 INCH OF RAIN IN 20 MINUTES.
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.
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
&&
LAT...LON 3956 10514 3963 10512 3979 10493 3978 10491
3980 10490 3980 10478 3977 10479 3977 10485
3976 10485 3975 10488 3974 10481 3960 10490
3956 10509
$$
BARJENBRUCH3 follow-up statements
259
WGUS75 KBOU 142157
FFSBOU
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
357 PM MDT THU JUL 14 2011
COC059-142201-
/O.CAN.KBOU.FF.W.0025.000000T0000Z-110715T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JEFFERSON CO-
357 PM MDT THU JUL 14 2011
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EAST CENTRAL
JEFFERSON COUNTY...
THE STORM HAS MOVED JUST EAST OF JEFFERSON COUNTY.
LAT...LON 3959 10506 3964 10504 3979 10493 3978 10491
3980 10490 3980 10478 3977 10479 3977 10485
3976 10486 3975 10488 3974 10481 3960 10490
3957 10504
$$
COC005-031-150015-
/O.CON.KBOU.FF.W.0025.000000T0000Z-110715T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ARAPAHOE CO-DENVER CO-
357 PM MDT THU JUL 14 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR
CENTRAL DENVER AND WESTERN ARAPAHOE COUNTIES...
AT 351 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY
HEAVY RAIN FROM A THUNDERSTORM NEAR ENGLEWOOD...OR ABOUT 6 MILES
SOUTH OF DENVER. THIS STORM WAS MOVING NORTHEAST AT 10 MPH.
LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
SHERIDAN...GREENWOOD VILLAGE...WESTERN CENTENNIAL...LITTLETON...
ENGLEWOOD...EASTERN DENVER AND WESTERN AURORA.
DOPPLER RADAR AND RAIN GAUGE ESTIMATES THAT 1.5 INCHES OF RAIN HAS
FALLEN IN THE SOUTHEAST PART OF DENVER WITH THE HEAVIEST RAINFALL
CENTERED AROUND COLORADO AND HAMPDEN.
DENVER COUNTY EMERGENCY OPERATIONS CENTER REPORTED THAT SOME CARS
WERE STRANDED NEAR THE INTERSECTIONS OF COLORADO AND YALE...AS WELL
AS COLORADO AND MAXWELL.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
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 3959 10506 3964 10504 3979 10493 3978 10491
3980 10490 3980 10478 3977 10479 3977 10485
3976 10486 3975 10488 3974 10481 3960 10490
3957 10504
$$
BARJENBRUCH999
WGUS75 KBOU 142301
FFSBOU
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
501 PM MDT THU JUL 14 2011
COC005-031-150015-
/O.CON.KBOU.FF.W.0025.000000T0000Z-110715T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ARAPAHOE CO-DENVER CO-
501 PM MDT THU JUL 14 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR
CENTRAL DENVER AND WESTERN ARAPAHOE COUNTIES...
AT 440 PM MDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED CARS HAD
BEEN IMPACTED BY FLOODING ON ARAPAHOE ROAD EAST OF UNIVERSITY
BLVD...UNIVERSITY BLVD NORTH OF ARAPAHOE ROAD ...DRY CREEK FROM
BROADWAY TO MONACO PARKWAY...AND HAMPDEN AVENUE IN CHERRY HILLS.
AUTOMATED GAUGES INDICATE THAT THE POWERS PARK DETENTION POND IN
LITTLETON ROSE TO 11.81 FEET AT 428 PM MDT. AT 11 FEET...WATER FLOWS
FROM THE DETENTION POND INTO THE WEST END OF POWERS PARK AND AT 12
FEET THE INTERSECTION OF SOUTH HURON STREET AND WEST BERRY AVENUE
FLOODS.
NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT ADDITIONAL
THUNDERSTORMS WITH MODERATE TO HEAVY RAIN ARE APPROACHING THE AREA.
THESE STORMS WERE MOVING NORTHEAST AT 10 MPH. THESE STORMS MAY
PRODUCE 0.5 TO 1 INCH OF RAINFALL IN 30 TO 60 MINUTES.
LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
SHERIDAN...GREENWOOD VILLAGE...WESTERN CENTENNIAL...LITTLETON...
ENGLEWOOD...EASTERN DENVER AND WESTERN AURORA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS
BRIDGES...DIPS...OR OTHER LOW SPOTS IF WATER COVERS THE ROADWAY.
NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO
ESCAPE RISING WATER CLIMB TO HIGHER GROUND.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT
THURSDAY EVENING FOR NORTHEASTERN COLORADO.
&&
LAT...LON 3959 10506 3964 10504 3979 10493 3978 10491
3980 10490 3980 10478 3977 10479 3977 10485
3976 10486 3975 10488 3974 10481 3960 10490
3957 10504
$$128
WGUS75 KBOU 142332
FFSBOU
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
532 PM MDT THU JUL 14 2011
COC005-031-142340-
/O.CAN.KBOU.FF.W.0025.000000T0000Z-110715T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ARAPAHOE CO-DENVER CO-
532 PM MDT THU JUL 14 2011
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL DENVER AND
WESTERN ARAPAHOE COUNTIES...
FLASH FLOODING IS NO LONGER EXPECTED.
LARGE STREAMS INCLUDING CHERRY CREEK...SAND CREEK...AND THE SOUTH
PLATTE RIVER WILL CONTINUE TO RUN HIGH FOR THE NEXT COUPLE HOURS.
SOME TRAILS AND BIKE PATHS MAY BE CLOSED.
LAT...LON 3959 10506 3964 10504 3979 10493 3978 10491
3980 10490 3980 10478 3977 10479 3977 10485
3976 10486 3975 10488 3974 10481 3960 10490
3957 10504
$$
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, 8:08 PM MDT | Flash Flood Warning | BOU | Boulder | 103 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, 3:28 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.