Alert archive / Iowa / Flash Flood Warnings in 2011
Flash Flood Warning 34, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Aug 4, 2011, 5:55 PM CDT for Clarke County, Lucas County, Warren County, Iowa. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 4, 2011, 5:55 PM CDT (22:55 UTC)
- Expired
- Aug 4, 2011, 9:07 PM CDT
- In force
- 3 hr
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Clarke County, IA, Lucas County, IA, Warren County, IA
The radar
The Des Moines radar (KDMX), 70 km from the middle of the area, began a volume at 22:55 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.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 10.9 hours before the alert went out and 241 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 116 J/kg
- Mixed-layer CIN
- -165 J/kg
- Mixed-layer LCL
- 949 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
422 WGUS53 KDMX 042255 FFWDMX IAC039-117-181-050500- /O.NEW.KDMX.FF.W.0034.110804T2255Z-110805T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 555 PM CDT THU AUG 4 2011 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHEASTERN CLARKE COUNTY IN SOUTH CENTRAL IOWA... NORTHWESTERN LUCAS COUNTY IN SOUTH CENTRAL IOWA... SOUTH CENTRAL WARREN COUNTY IN SOUTH CENTRAL IOWA... * UNTIL MIDNIGHT CDT FRIDAY * AT 554 PM CDT...STORMS OVER WESTERN LUCAS COUNTY HAVE PRODUCED A RADAR INDICATED 3 TO 5 INCHES OF RAIN OVER THE WARNED AREA. RAINFALL IS EXPECTED TO CONTINUE. * FLASH FLOODING IS EXPECTED TO OCCUR OVER MAINLY RURAL AREAS OF NORTHEASTERN CLARKE...NORTHWESTERN LUCAS AND SOUTH CENTRAL WARREN COUNTIES...INCLUDING THE TOWNS OF CHARITON AIRPORT...LACONA...LUCAS AND OSCEOLA AIRPORT. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. && LAT...LON 4121 9336 4097 9336 4104 9370 4121 9370 $$ AW
3 follow-up statements
242 WGUS73 KDMX 042359 FFSDMX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 659 PM CDT THU AUG 4 2011 IAC039-117-181-050500- /O.CON.KDMX.FF.W.0034.000000T0000Z-110805T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WARREN IA-LUCAS IA-CLARKE IA- 659 PM CDT THU AUG 4 2011 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHEASTERN CLARKE... NORTHWESTERN LUCAS AND SOUTH CENTRAL WARREN COUNTIES UNTIL MIDNIGHT CDT... AT 658 PM CDT...HEAVY RAINFALL ACROSS THE WARNED AREA HAS COME TO AN END...WITH LIGHTER PRECIPITATION PERSISTING. RADAR ESTIMATES OF 3 TO 5 INCHES OF RAINFALL ACROSS THE AREA COULD LEAD TO AREAS OF FLASH FLOODING. FLASH IS EXPECTED TO OCCUR OVER MAINLY RURAL AREAS OF NORTHEASTERN CLARKE...NORTHWESTERN LUCAS AND SOUTH CENTRAL WARREN COUNTIES... INCLUDING THE TOWNS OF CHARITON AIRPORT...LACONA...LUCAS AND OSCEOLA AIRPORT. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS... AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. && LAT...LON 4121 9336 4097 9336 4104 9370 4121 9370 $$ AW
305 WGUS73 KDMX 050057 FFSDMX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 757 PM CDT THU AUG 4 2011 IAC039-117-181-050500- /O.CON.KDMX.FF.W.0034.000000T0000Z-110805T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WARREN IA-LUCAS IA-CLARKE IA- 757 PM CDT THU AUG 4 2011 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHEASTERN CLARKE... NORTHWESTERN LUCAS AND SOUTH CENTRAL WARREN COUNTIES UNTIL MIDNIGHT CDT... AT 756 PM CDT...HEAVY RAINFALL ACROSS THE WARNED AREA HAS COME TO AN END...WITH LIGHTER PRECIPITATION PERSISTING ACROSS EASTERN CLARKE AND LUCAS COUNTIES. RADAR ESTIMATES OF 3 TO 5 INCHES OF RAINFALL ACROSS THE AREA COULD LEAD TO AREAS OF FLASH FLOODING. FLASH IS EXPECTED TO OCCUR OVER MAINLY RURAL AREAS OF NORTHEASTERN CLARKE...NORTHWESTERN LUCAS AND SOUTH CENTRAL WARREN COUNTIES... INCLUDING THE TOWNS OF CHARITON AIRPORT...LACONA...LUCAS AND OSCEOLA AIRPORT. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS... AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. && LAT...LON 4121 9336 4097 9336 4104 9370 4121 9370 $$ AW
557 WGUS73 KDMX 050207 FFSDMX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 907 PM CDT THU AUG 4 2011 IAC039-117-181-050223- /O.CAN.KDMX.FF.W.0034.000000T0000Z-110805T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WARREN IA-LUCAS IA-CLARKE IA- 907 PM CDT THU AUG 4 2011 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHEASTERN CLARKE...NORTHWESTERN LUCAS AND SOUTH CENTRAL WARREN COUNTIES IS CANCELLED... EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED... PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY. LAT...LON 4121 9336 4097 9336 4104 9370 4121 9370 $$
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 3:14 PM CDT | Severe Thunderstorm Warning | DMX | Warren | 31 min |
Nearby
Flash Flood Warnings in Iowa, 2011Every flash flood warning in 2011
Sources
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.