Flash Flood Warning 4, NWS Denver/Boulder, CO

Issued

Jun 9, 2011, 12:19 AM MDT (06:19 UTC)

Expired

Jun 9, 2011, 3:15 AM MDT

In force

3 hr

Issued by

NWS Denver/Boulder, CO

Area

Storm-based polygon

Flood severity

None

County Larimer County, CO

The Cheyenne radar (KCYS), 77 km from the middle of the area, began a volume at 06:21 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.

558 
WGUS55 KBOU 090619
FFWBOU
COC069-090915-
/O.NEW.KBOU.FF.W.0004.110609T0619Z-110609T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
1219 AM MDT THU JUN 9 2011

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL LARIMER COUNTY IN NORTH CENTRAL COLORADO FOR THE CRYSTAL   
  BURN AREA

* UNTIL 315 AM MDT

* AT 1215 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR            
  INDICATED ANOTHER BAND OF HEAVY RAIN MOVING INTO THE CRYSTAL BURN  
  AREA. AN ADDITIONAL HALF OF AN INCH OF RAIN MAY FALL IN LESS THAN  
  30 MINUTES. THIS IS IN ADDITION TO THE INCH OF RAIN WHICH HAD      
  FALLEN FROM EARLIER STORMS. 

* THE STORM PRODUCING VERY HEAVY RAIN WILL REMAIN OVER MAINLY RURAL
  AREAS OF THE WARNED COUNTY.

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 CREEKS
AND STREAMS...ROADS...AND ROADSIDE CULVERTS IN THE CRYSTAL BURN AREA.
THE HEAVY RAINS COULD ALSO TRIGGER ROCK SLIDES OR DEBRIS FLOWS IN THE
CRYSTAL BURN AREA. SOME DRAINAGE BASINS AFFECTED BY EXCESSIVE RUNOFF
INCLUDE BUCKHORN CREEK...FISH CREEK...LAWRENCE CREEK AND REDSTONE
CREEK.

&&

LAT...LON 4060 10526 4054 10520 4052 10534 4054 10540

$$

070 
WGUS75 KBOU 090742
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
142 AM MDT THU JUN 9 2011

COC069-090915-
/O.CON.KBOU.FF.W.0004.000000T0000Z-110609T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LARIMER CO-
142 AM MDT THU JUN 9 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM MDT FOR
CENTRAL LARIMER COUNTY...

AT 140 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
RAIN HAD ENDED OVER THE CRYSTAL BURN AREA...BUT THERE IS THE 
POTENTIAL FOR MORE RAIN TO DEVELOP THROUGH 5 AM.  

DOPPLER RADAR INDICATED RAINFALL ESTIMATES OF 1 TO 2 INCHES OF RAIN 
MAY HAVE ALREADY FALLEN OVER THE BURN AREA. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF CREEKS
AND STREAMS...ROADS...AND ROADSIDE CULVERTS IN THE CRYSTAL BURN AREA.
THE HEAVY RAINS COULD ALSO TRIGGER ROCK SLIDES OR DEBRIS FLOWS IN THE
CRYSTAL BURN AREA. SOME DRAINAGE BASINS AFFECTED BY EXCESSIVE RUNOFF
INCLUDE BUCKHORN CREEK...FISH CREEK...LAWRENCE CREEK AND REDSTONE
CREEK.

&&

LAT...LON 4060 10526 4054 10520 4052 10534 4054 10540

$$

309 
WGUS75 KBOU 090919
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
319 AM MDT THU JUN 9 2011

COC069-090927-
/O.EXP.KBOU.FF.W.0004.000000T0000Z-110609T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LARIMER CO-
319 AM MDT THU JUN 9 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR CENTRAL LARIMER COUNTY...

SCATTERED RAIN SHOWERS WILL CONTINUE OVER THE CRYSTAL BURN AREA 
THROUGH DAYBREAK BUT ANY ADDITIONAL RAINFALL WILL BE MORE 
MANAGEABLE...GENERALLY UNDER A QUARTER OF AN INCH PER HOUR. 

NO REPORTS OF FLOODING HAVE BEEN REPORTED BY LOCAL OFFICIALS. 

LAT...LON 4060 10526 4054 10520 4052 10534 4054 10540

$$

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.