Alert archive / Iowa / Flash Flood Warnings in 2011
Flash Flood Warning 7, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at May 25, 2011, 12:38 AM CDT for Clarke County, Union County, Iowa. It was in force for 6 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
- May 25, 2011, 12:38 AM CDT (05:38 UTC)
- Expired
- May 25, 2011, 6:30 AM CDT
- In force
- 6 hr
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Clarke County, IA, Union County, IA
The radar
The Des Moines radar (KDMX), 86 km from the middle of the area, began a volume at 05:39 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 00:00Z, 5.6 hours before the alert went out and 189 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
- 208 J/kg
- Mixed-layer CIN
- -192 J/kg
- Mixed-layer LCL
- 889 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 28 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
312
WGUS53 KDMX 250538
FFWDMX
IAC039-175-251130-
/O.NEW.KDMX.FF.W.0007.110525T0538Z-110525T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1238 AM CDT WED MAY 25 2011
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CLARKE COUNTY IN SOUTH CENTRAL IOWA...
UNION COUNTY IN SOUTH CENTRAL IOWA...
* UNTIL 630 AM CDT
* AT 1237 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
WARNED AREA. RAINFALL RATES OF UP TO AN INCH IN A 15 TO 20 MINUTE
PERIOD HAVE OCCURRED IN UNION COUNTY WITH ADDITIONAL THUNDERSTORMS
MOVING INTO THE AREA.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
CRESTON AND OSCEOLA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.
&&
LAT...LON 4106 9448 4116 9413 4116 9355 4096 9356
4090 9433 4090 9447
$$4 follow-up statements
992
WGUS73 KDMX 250640
FFSDMX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
140 AM CDT WED MAY 25 2011
IAC039-175-251130-
/O.CON.KDMX.FF.W.0007.000000T0000Z-110525T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
UNION IA-CLARKE IA-
140 AM CDT WED MAY 25 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR CLARKE AND UNION
COUNTIES UNTIL 630 AM CDT...
AT 138 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.
DOPPLER RADAR INDICATED THAT PART OF THE WARNED AREA HAVE RECEIVED 2
TO 3 INCHES OF RAINFALL. OBSERVATIONS INDICATED THAT OVER 1.5
INCHES OF THIS FELL IN UNDER AN HOUR. THE HEAVY THUNDERSTORMS HAVE
MOVED NORTHEAST OF THE AREA...HOWEVER ADDITIONAL LIGHTER RAINFALL IS
EXPECTED THROUGH THE BALANCE OF THE MORNING.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
CRESTON AND OSCEOLA.
LAW ENFORCEMENT REPORTED THAT ONLY URBAN FLOODING HAS OCCURRED THUS
FAR WITH TYPICAL LOW SPOTS BEING FLOODED.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
&&
LAT...LON 4106 9448 4116 9413 4116 9355 4096 9356
4090 9433 4090 9447
$$749
WGUS73 KDMX 250728
FFSDMX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
228 AM CDT WED MAY 25 2011
IAC039-175-251130-
/O.CON.KDMX.FF.W.0007.000000T0000Z-110525T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
UNION IA-CLARKE IA-
228 AM CDT WED MAY 25 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR CLARKE AND UNION
COUNTIES UNTIL 630 AM CDT...
AT 226 AM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED
THUNDERSTORMS WITH VERY HEAVY RAINFALL MOVED ACROSS THE AREA. SO
FAR...FLOODING HAS BEEN RESTRICTED TO LOW CROSSING AREAS AND URBAN
ROADWAYS.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
CRESTON AND OSCEOLA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THE HEAVY STORMS HAVE MOVED TO THE NORTHEAST OF THE AREA.
ADDITIONAL RAINFALL AMOUNTS OF UP TO ONE HALF INCH ARE EXPECTED
THROUGH THE REST OF THE NIGHT IN THE WARNED AREA.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
&&
LAT...LON 4106 9448 4116 9413 4116 9355 4096 9356
4090 9433 4090 9447
$$391
WGUS73 KDMX 251010
FFSDMX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
510 AM CDT WED MAY 25 2011
IAC039-175-251130-
/O.CON.KDMX.FF.W.0007.000000T0000Z-110525T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
UNION IA-CLARKE IA-
510 AM CDT WED MAY 25 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR CLARKE AND UNION
COUNTIES UNTIL 630 AM CDT...
AT 507 AM CDT...THUNDERSTORMS WITH VERY HEAVY RAINFALL MOVED ACROSS
THE AREA OVERNIGHT HOWEVER THE HEAVY RAINFALL HAS ENDED. THUS
FAR...FLOODING HAS BEEN RESTRICTED TO LOW CROSSING AREAS AND URBAN
ROADWAYS. DAYLIGHT THIS MORNING MAY REVEAL ADDITIONAL PROBLEM AREAS.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
CRESTON AND OSCEOLA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
&&
LAT...LON 4106 9448 4116 9413 4116 9355 4096 9356
4090 9433 4090 9447
$$
DONAVON404
WGUS73 KDMX 251129
FFSDMX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
629 AM CDT WED MAY 25 2011
IAC039-175-251144-
/O.EXP.KDMX.FF.W.0007.000000T0000Z-110525T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
UNION IA-CLARKE IA-
629 AM CDT WED MAY 25 2011
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR CLARKE AND UNION
COUNTIES WILL BE ALLOWED TO EXPIRE AT 630 AM CDT...
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 4106 9448 4116 9413 4116 9355 4096 9356
4090 9433 4090 9447
$$
DONAVONThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 24, 9:45 PM CDT | Flash Flood Watch | DMX | Adair, Adams, Appanoose, Cass, Clarke, Davis and 11 more | 24 hr |
| May 25, 1:05 AM CDT | River Flood Warning | DMX | Decatur | 57 hr |
| May 25, 4:22 AM CDT | Wind Advisory | DMX | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more | 17 hr |
| May 25, 6:04 AM CDT | River Flood Warning | DMX | Madison, Warren | 27 hr |
| May 25, 6:22 AM CDT | River Flood Warning | DMX | Madison, Warren | 22 hr |
| May 25, 6:22 AM CDT | River Flood Warning | DMX | Warren | 9 hr |
| May 25, 6:53 AM CDT | River Flood Warning | DMX | Appanoose, Wayne | 30 hr |
| May 25, 7:25 AM CDT | River Flood Warning | DMX | Lucas, Wayne | 24 hr |
| May 25, 7:58 AM CDT | River Flood Warning | DMX | Wapello | 23 hr |
| May 25, 3:04 PM CDT | River Flood Warning | DMX | Boone, Hamilton, Webster | 7 days |
| May 25, 3:18 PM CDT | River Flood Warning | DMX | Mahaska, Marion | 18 hr |
| May 25, 3:53 PM CDT | Flash Flood Warning | DMX | Decatur, Lucas, Wayne | 3 hr |
| May 25, 4:34 PM CDT | Flash Flood Warning | DMX | Appanoose, Davis, Wapello | 4 hr |
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.