Flash Flood Warning 17, NWS Denver/Boulder, CO

Issued

Jul 12, 2011, 10:54 PM MDT (04:54 UTC)

Expired

Jul 13, 2011, 12:59 AM MDT

In force

2 hr

Issued by

NWS Denver/Boulder, CO

Area

Storm-based polygon

Flood severity

None

County Larimer County, CO

The Cheyenne radar (KCYS), 45 km from the middle of the area, began a volume at 04:57 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.

730 
WGUS55 KBOU 130454
FFWBOU
COC069-130800-
/O.NEW.KBOU.FF.W.0017.110713T0454Z-110713T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
1054 PM MDT TUE JUL 12 2011

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN LARIMER COUNTY IN NORTH CENTRAL COLORADO

* UNTIL 200 AM MDT

* AT 1053 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM CENTERED OVER NORTHERN FORT
  COLLINS. MORE STORMS WITH HEAVY RAIN EXTENDED NORTHWARD FROM THIS
  AREA TO THE WYOMING BORDER.  STORM WAS MOVING NORTHEAST AT 25 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  WELLINGTON...TIMNATH...TEDS PLACE...MASONVILLE...BELLVUE AND FORT
  COLLINS.

THESE STORMS WILL PRODUCE UP TO 2 INCHES OF RAIN IN 30 TO 45 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 4100 10494 4052 10496 4045 10532 4100 10514

$$
BARJENBRUCH

170 
WGUS75 KBOU 130625
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1225 AM MDT WED JUL 13 2011

COC069-130800-
/O.CON.KBOU.FF.W.0017.000000T0000Z-110713T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LARIMER CO-
1225 AM MDT WED JUL 13 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 AM MDT FOR
EASTERN LARIMER COUNTY...

AT 1221 AM MDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED MOSTLY 
MINOR FLOODING HAD OCCURRED IN THE FORT COLLINS AREA.  THERE WERE 
SEVERAL INTERSECTIONS UNDER STANDING WATER UP TO 10 INCHES DEEP.  
MEANWHILE...SOME SMALL ROCKSLIDES WERE REPORTED IN THE HIGHER 
TERRAIN WEST OF FORT COLLINS AROUND HORSETOOTH RESERVOIR.  LARGER 
STREAMS SUCH AS THE CACHE LA POUDRE WERE NOT SHOWING LARGE WATER 
RISES AT THIS TIME.

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE HEAVIEST 
RAIN HAD SHIFTED EAST OF LARIMER COUNTY AT THIS TIME.

LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
WELLINGTON...TIMNATH...TEDS PLACE...MASONVILLE...BELLVUE AND FORT 
COLLINS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS...CITY STREETS AND UNDERPASSES.
ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS
AND STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

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 10494 4052 10496 4045 10532 4100 10514

$$
BARJENBRUCH

987 
WGUS75 KBOU 130659
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1259 AM MDT WED JUL 13 2011

COC069-130708-
/O.CAN.KBOU.FF.W.0017.000000T0000Z-110713T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LARIMER CO-
1259 AM MDT WED JUL 13 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EASTERN LARIMER
COUNTY...

RAIN HAD DECREASED TO JUST A FEW LIGHT SHOWERS.  THE LARIMER COUNTY 
SHERIFF REPORTED THAT ALL FLOODING ISSUES HAVE PASSED.

LAT...LON 4100 10494 4052 10496 4045 10532 4100 10514

$$
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.