Flash Flood Warning 16, NWS Denver/Boulder, CO

Issued

Jul 12, 2011, 10:48 PM MDT (04:48 UTC)

Expired

Jul 13, 2011, 1:45 AM MDT

In force

3 hr

Issued by

NWS Denver/Boulder, CO

Area

Storm-based polygon

Flood severity

None

County Weld County, CO

The Cheyenne radar (KCYS), 66 km from the middle of the area, began a volume at 04:49 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.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

551 
WGUS55 KBOU 130448
FFWBOU
COC123-130745-
/O.NEW.KBOU.FF.W.0016.110713T0448Z-110713T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
1048 PM MDT TUE JUL 12 2011

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN WELD COUNTY IN NORTHEAST COLORADO

* UNTIL 145 AM MDT

* AT 1042 PM MDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH 
  FLOODING WITH WATER 2 FEET DEEP NEAR COUNTY ROAD 100 AND COUNTY
  ROAD 77 NORTH OF BRIGGSDALE.  THUNDERSTORMS CONTINUED TO MOVE
  OVER THE AREA...WITH ADDITIONAL HEAVY RAINFALL EXPECTED THROUGH 
  MIDNIGHT.  THESE STORMS WILL PRODUCE ANOTHER 1 TO 2 INCHES OF
  RAIN IN 30 MINUTES...ON TOP OF THE 2 TO 4 INCHES OF RAIN THAT HAS
  ALREADY FALLEN NORTH OF BRIGGSDALE.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PURCELL...
  PAWNEE BUTTES...KEOTA...HEREFORD...GROVER AND BRIGGSDALE.

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 4101 10371 4068 10369 4052 10454 4060 10471
      4100 10470

$$

644 
WGUS75 KBOU 130546
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1146 PM MDT TUE JUL 12 2011

COC123-130745-
/O.CON.KBOU.FF.W.0016.000000T0000Z-110713T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WELD CO-
1146 PM MDT TUE JUL 12 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 AM MDT FOR
NORTHERN WELD COUNTY...

AT 1143 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
VERY HEAVY RAIN FROM A THUNDERSTORM 7 MILES NORTHWEST OF KEOTA...OR 
ABOUT 37 MILES NORTHEAST OF GREELEY. THIS STORM WAS MOVING NORTHEAST 
AT 25 MPH.

LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
PURCELL...PAWNEE BUTTES...KEOTA...HEREFORD...GROVER AND BRIGGSDALE.

DOPPLER RADAR ESTIMATES THAT 2 AND 4.5 INCHES OF RAIN HAS FALLEN 
OVER A LARGE AREA OF NORTHERN WELD COUNTY.  MOST OF THIS HEAVIER 
RAIN HAD FALLEN NORTH OF HIGHWAY 14 AND EAST OF HIGHWAY 85.

HEAVY RAIN IS EXPECTED TO GRADUALLY DECREASE FROM WEST TO EAST 
ACROSS THE WARNING AREA THROUGH 1 AM.  HOWEVER...UNTIL THEN... 
ANOTHER INCH OF RAIN CAN STILL BE EXPECTED FROM THE STRONGEST STORMS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES AND
ARROYOS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

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 4101 10371 4068 10369 4052 10454 4060 10471
      4100 10470

$$
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.