Flash Flood Warning 23, NWS Denver/Boulder, CO

Issued

Jul 14, 2011, 1:00 PM MDT (19:00 UTC)

Expired

Jul 14, 2011, 4:00 PM MDT

In force

3 hr

Issued by

NWS Denver/Boulder, CO

Area

Storm-based polygon

Flood severity

None

County Boulder County, CO

The Denver radar (KFTG), 77 km from the middle of the area, began a volume at 19:00 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.

874 
WGUS55 KBOU 141900
FFWBOU
COC013-142200-
/O.NEW.KBOU.FF.W.0023.110714T1900Z-110714T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
100 PM MDT THU JUL 14 2011

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  FOURMILE BURN AREA IN CENTRAL BOULDER COUNTY IN NORTHEAST COLORADO

* UNTIL 400 PM MDT

* AT 1259 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM NEAR WALLSTREET...OR 31 MILES
  NORTHWEST OF DENVER. THIS STORM WAS MOVING NORTHEAST AT 10 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  WALLSTREET...SUNSHINE...SUMMERVILLE...SALINA...CRISMAN AND GOLD
  HILL.

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.

HEAVY RAINFALL WILL CAUSE FLASH FLOODING OF CREEKS...STREAMS...AND
DITCHES IN THE FOURMILE BURN AREA. SOME DRAINAGE BASINS AFFECTED BY
EXCESSIVE RUNOFF INCLUDE FOURMILE CREEK...GOLD RUN...AND FOURMILE
CANYON CREEK. WATER WILL BE FLOWING DOWN ROADWAYS. ROCK SLIDES OR
DEBRIS FLOWS CAN ALSO BE EXPECTED.

&&

LAT...LON 4007 10539 4008 10535 4005 10534 4004 10537
      4002 10540 4005 10543

$$

470 
WGUS75 KBOU 141932
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
132 PM MDT THU JUL 14 2011

COC013-142200-
/O.CON.KBOU.FF.W.0023.000000T0000Z-110714T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BOULDER CO-
132 PM MDT THU JUL 14 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 PM MDT FOR THE 
FOURMILE BURN AREA IN CENTRAL BOULDER COUNTY...

AT 125 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT ONE THUNDERSTORM WITH HEAVY RAIN HAD MOVED OUT OF THE BURN 
AREA.  HOWEVER...ANOTHER THUNDERSTORM WITH HEAVY RAIN MAY REACH THE 
FOURMILE BURN AREA BETWEEN 145 AND 200 PM.  

THE FIRST STORM PRODUCED ANYWHERE FROM ONE TENTH TO FOUR TENTHS OF 
AN INCH OF RAIN...WITH SIMILAR AMOUNTS POSSIBLE FROM THE SECOND 
STORM.  THE STORMS WERE MOVING NORTHEAST AT 15 MPH.

LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
WALLSTREET...SUNSHINE...SUMMERVILLE AND SALINA.  THIS WARNING ALSO 
INCLUDES FOURMILE CREEK DOWNSTREAM TO THE CONFLUENCE WITH BOULDER 
CREEK. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL WILL CAUSE FLASH FLOODING OF CREEKS...STREAMS...AND
DITCHES IN THE FOURMILE BURN AREA. SOME DRAINAGE BASINS AFFECTED BY
EXCESSIVE RUNOFF INCLUDE FOURMILE CREEK...GOLD RUN...AND FOURMILE
CANYON CREEK. WATER WILL BE FLOWING DOWN ROADWAYS. ROCK SLIDES OR
DEBRIS FLOWS CAN ALSO BE EXPECTED.

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 4007 10539 4008 10535 4005 10534 4004 10537
      4002 10540 4005 10543

$$
BARJENBRUCH

Flash Flood Warnings in Colorado, 2011Every flash flood warning in 2011

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.