Alert archive / Iowa / Flash Flood Warnings in 2011
Flash Flood Warning 4, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at May 11, 2011, 2:43 PM CDT for Adams County, Taylor County, Iowa. It was in force for 6 hr. 4 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 11, 2011, 2:43 PM CDT (19:43 UTC)
- Expired
- May 11, 2011, 8:30 PM CDT
- In force
- 6 hr
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Adams County, IA, Taylor County, IA
The radar
The Des Moines radar (KDMX), 130 km from the middle of the area, began a volume at 19:47 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 11, 4:30 PM CDT | FLASH FLOOD | 1 Wsw Nodaway, IA | ADAMS COUNTY LAW ENFORCEMENT REPORTED RAILROAD TRACKS WASHED OUT BETWEEN TRACK MILE MARKERS 423 AND 424. |
| May 11, 4:30 PM CDT | FLASH FLOOD | 2 Ne Nodaway, IA | WATER OVER CHESTNUT AVE BETWEEN 240TH AND 250TH STREET. |
| May 11, 4:30 PM CDT | FLASH FLOOD | Nodaway, IA | SEVERAL PLACES THROUGHOUT NODAWAY WITH 6 INCHES OF WATER FLOWING OVER ROADS AND INUNDATING HOUSES AND BUSINESSES. |
| May 11, 5:00 PM CDT | FLASH FLOOD | Nodaway, IA | WATER UP TO THE RAILROAD TRACKS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 7.7 hours before the alert went out and 133 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
- 909 J/kg
- Mixed-layer CIN
- -95 J/kg
- Mixed-layer LCL
- 1123 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 177 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.2
The text
As transmitted, in the capitals the NWS used until 2016.
797 WGUS53 KDMX 111943 FFWDMX IAC003-173-120130- /O.NEW.KDMX.FF.W.0004.110511T1943Z-110512T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 243 PM CDT WED MAY 11 2011 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHWESTERN TAYLOR COUNTY IN SOUTHWEST IOWA... WESTERN ADAMS COUNTY IN SOUTHWEST IOWA... * UNTIL 830 PM CDT * AT 243 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. FLASH FLOODING IS EXPECTED TO OCCUR OVER MAINLY RURAL AREAS OF NORTHWESTERN TAYLOR AND WESTERN ADAMS COUNTIES...INCLUDING THE TOWNS OF CARBON AND NODAWAY. 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. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. TURN AROUND...DONT DROWN. && LAT...LON 4079 9493 4116 9494 4116 9475 4079 9479 $$ COGIL
4 follow-up statements
786 WGUS73 KDMX 112056 FFSDMX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 356 PM CDT WED MAY 11 2011 IAC003-173-120130- /O.CON.KDMX.FF.W.0004.000000T0000Z-110512T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ TAYLOR IA-ADAMS IA- 356 PM CDT WED MAY 11 2011 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR WESTERN ADAMS AND NORTHWESTERN TAYLOR COUNTIES UNTIL 830 PM CDT... AT 355 PM CDT...WEATHER SPOTTERS REPORTED THAT THERE IS NO LONGER WATER OVER ROADS BUT FIELDS AND DITCHES HAVE STANDING WATER IN THEM. ADDITIONAL THUNDERSTORMS ARE HEADED INTO THE WARNED AREA AND MAY CAUSE ADDITIONAL FLOODING IF HEAVY RAIN MOVES OVER THE SAME AREAS. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. FLASH IS EXPECTED TO OCCUR OVER MAINLY RURAL AREAS OF NORTHWESTERN TAYLOR AND WESTERN ADAMS COUNTIES...INCLUDING THE TOWNS OF CARBON AND NODAWAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WARNING MEANS THAT FLASH FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA...MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. && LAT...LON 4079 9493 4116 9494 4116 9475 4079 9479 $$ BOKSA
150 WGUS73 KDMX 112206 FFSDMX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 506 PM CDT WED MAY 11 2011 IAC003-173-120130- /O.CON.KDMX.FF.W.0004.000000T0000Z-110512T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ TAYLOR IA-ADAMS IA- 506 PM CDT WED MAY 11 2011 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR WESTERN ADAMS AND NORTHWESTERN TAYLOR COUNTIES UNTIL 830 PM CDT... AT 500 PM CDT...WEATHER SPOTTERS REPORTED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. RAINFALL RATES OF 2 TO 3 INCHES PER HOUR CAN BE EXPECTED THROUGH THE NEXT 1 TO 2 HOURS. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. FLASH IS EXPECTED TO OCCUR OVER MAINLY RURAL AREAS OF NORTHWESTERN TAYLOR AND WESTERN ADAMS COUNTIES...INCLUDING THE TOWNS OF CARBON AND NODAWAY. AT ABOUT 5PM CDT...A STORM SPOTTER REPORTED WATER UP TO RAILROAD TRACKS JUST NORTH OF NODAWAY IN WESTERN ADAMS COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WARNING MEANS THAT FLASH 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. && LAT...LON 4079 9493 4116 9494 4116 9475 4079 9479 $$ PODRAZIK
879 WGUS73 KDMX 120001 FFSDMX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 701 PM CDT WED MAY 11 2011 IAC003-173-120130- /O.CON.KDMX.FF.W.0004.000000T0000Z-110512T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ TAYLOR IA-ADAMS IA- 701 PM CDT WED MAY 11 2011 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR WESTERN ADAMS AND NORTHWESTERN TAYLOR COUNTIES UNTIL 830 PM CDT... AT 659 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. FLASH IS EXPECTED TO OCCUR OVER MAINLY RURAL AREAS OF NORTHWESTERN TAYLOR AND WESTERN ADAMS COUNTIES...INCLUDING THE TOWNS OF CARBON AND NODAWAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS... AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. AT 7 PM CDT...ADAMS COUNTY LAW ENFORCEMENT REPORTED FLOODING ISSUES CONTINUE WITHIN THE TOWN OF NODAWAY AND THROUGHOUT OTHER PORTIONS OF THE ADAMS COUNTY. A FLASH FLOOD WARNING MEANS THAT FLASH FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA...MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. && LAT...LON 4079 9493 4116 9494 4116 9475 4079 9479 $$ PODRAZIK
030 WGUS73 KDMX 120130 FFSDMX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 830 PM CDT WED MAY 11 2011 IAC003-173-120145- /O.EXP.KDMX.FF.W.0004.000000T0000Z-110512T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ TAYLOR IA-ADAMS IA- 830 PM CDT WED MAY 11 2011 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR WESTERN ADAMS AND NORTHWESTERN TAYLOR COUNTIES HAS BEEN ALLOWED TO EXPIRE... 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 4079 9493 4116 9494 4116 9475 4079 9479 $$ SMALL
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 12:43 PM CDT | Severe Thunderstorm Warning | DMX | Adams, Cass | 47 min |
| May 11, 2:05 PM CDT | Severe Thunderstorm Warning | DMX | Adams, Taylor | 55 min |
| May 11, 2:22 PM CDT | Tornado Warning | DMX | Adams | 23 min |
| May 11, 2:51 PM CDT | Severe Thunderstorm Warning | DMX | Adams, Taylor | 39 min |
| May 11, 4:01 PM CDT | Severe Thunderstorm Warning | DMX | Adams, Taylor | 44 min |
| May 11, 4:11 PM CDT | Tornado Warning | DMX | Adams, Taylor | 49 min |
| May 11, 4:42 PM CDT | Flash Flood Warning | DMX | Adams, Taylor | 6 hr |
| May 11, 4:50 PM CDT | Tornado Warning | DMX | Adams, Union | 40 min |
| May 11, 4:57 PM CDT | Severe Thunderstorm Warning | DMX | Adams, Taylor | 38 min |
| May 11, 5:32 PM CDT | Severe Thunderstorm Warning | DMX | Adams, Ringgold, Taylor, Union | 43 min |
| May 11, 5:42 PM CDT | Tornado Warning | DMX | Union | 33 min |
| May 11, 5:44 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Lucas, Madison, Ringgold, Warren | 46 min |
| May 11, 6:03 PM CDT | Flash Flood Warning | DMX | Union | 6 hr |
| May 11, 6:06 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Clarke, Madison, Union | 54 min |
| May 11, 6:37 PM CDT | Severe Thunderstorm Warning | DMX | Dallas, Madison, Polk, Warren | 53 min |
| May 11, 6:42 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Lucas, Warren | 48 min |
| May 11, 6:46 PM CDT | Severe Thunderstorm Warning | DMX | Wayne | 44 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.