Flash Flood Warning 32, NWS Omaha, NE

Issued

Aug 18, 2011, 5:41 PM CDT (22:41 UTC)

Expired

Aug 18, 2011, 10:30 PM CDT

In force

5 hr

Issued by

NWS Omaha, NE

Area

Storm-based polygon

Flood severity

None

Counties Harrison County, IA, Pottawattamie County, IA, Douglas County, NE, Washington County, NE

The Omaha radar (KOAX), 41 km from the middle of the area, began a volume at 22:40 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.

246 
WGUS53 KOAX 182241
FFWOAX
IAC085-155-NEC055-177-190330-
/O.NEW.KOAX.FF.W.0032.110818T2241Z-110819T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
541 PM CDT THU AUG 18 2011

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DOUGLAS COUNTY IN EAST CENTRAL NEBRASKA
  EASTERN WASHINGTON COUNTY IN EAST CENTRAL NEBRASKA
  SOUTHWESTERN HARRISON COUNTY IN SOUTHWEST IOWA
  WESTERN POTTAWATTAMIE COUNTY IN SOUTHWEST IOWA

* UNTIL 1030 PM CDT

* AT 535 PM CDT...FLOODING WAS REPORTED IN THE EASTERN PART OF 
OMAHA. SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL MOVED
ACROSS THE WARNED AREA. OTHER STORMS MAY MOVE INTO THE WARNED AREA 
THIS EVENING.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  EASTERN OMAHA...BLAIR...COUNCIL BLUFFS...FORT CALHOUN...MISSOURI
  VALLEY AND UNDERWOOD.

THE WARNED AREA INCLUDES INTERSTATE 80 IN NEBRASKA BETWEEN MILE 
MARKERS 452 AND 454.

THE WARNED AREA INCLUDES INTERSTATE 80 IN IOWA BETWEEN MILE MARKERS
17 AND 8.

THE WARNED AREA INCLUDES INTERSTATE 29 IN IOWA BETWEEN MILE MARKERS
43 AND 75.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. USE ALTERNATE
ROUTES AROUND FLOOD PRONE AREAS.

&&

LAT...LON 4150 9568 4117 9561 4117 9583 4119 9585
      4119 9595 4140 9601 4150 9616 4164 9618

$$

MILLER

002 
WGUS73 KOAX 190035
FFSOAX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
735 PM CDT THU AUG 18 2011

IAC085-155-NEC055-177-190330-
/O.CON.KOAX.FF.W.0032.000000T0000Z-110819T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
POTTAWATTAMIE IA-HARRISON IA-DOUGLAS NE-WASHINGTON NE-
735 PM CDT THU AUG 18 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR EASTERN WASHINGTON...
DOUGLAS...SOUTHWESTERN HARRISON AND WESTERN POTTAWATTAMIE COUNTIES
UNTIL 1030 PM CDT...

AT 730 PM CDT...THE PUBLIC REPORTED THUNDERSTORMS WITH VERY HEAVY 
RAINFALL ACROSS THE WARNED AREA. THIS COMBINED WITH PAST RAINFALL 
EXCEEDING TWO AND A HALF INCHES OVER THE PAST 5 HOURS WILL CONTINUE 
THE THREAT FOR FLOODING.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
OMAHA...BLAIR...COUNCIL BLUFFS...FORT CALHOUN...MISSOURI VALLEY AND
UNDERWOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE MINOR FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 4150 9568 4117 9561 4117 9583 4119 9585
      4119 9595 4140 9601 4150 9616 4164 9618

$$

PEARSON

Flash Flood Warnings in Iowa, 2011Flash Flood Warnings in Nebraska, 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.