Alert archive / Iowa / Flash Flood Warnings in 2011
Flash Flood Warning 8, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at May 25, 2011, 3:53 PM CDT for Decatur County, Lucas County, Wayne 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
- May 25, 2011, 3:53 PM CDT (20:53 UTC)
- Expired
- May 25, 2011, 6:55 PM CDT
- In force
- 3 hr
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Decatur County, IA, Lucas County, IA, Wayne County, IA
The radar
The Des Moines radar (KDMX), 109 km from the middle of the area, began a volume at 20:55 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, 8.9 hours before the alert went out and 238 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
- 159 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 565 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- -2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
993
WGUS53 KDMX 252053
FFWDMX
IAC053-117-185-260300-
/O.NEW.KDMX.FF.W.0008.110525T2053Z-110526T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
353 PM CDT WED MAY 25 2011
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
* FLASH FLOOD WARNING FOR MINOR FLOODING OF POOR DRAINAGE AREAS IN...
DECATUR COUNTY IN SOUTH CENTRAL IOWA...
SOUTHERN LUCAS COUNTY IN SOUTH CENTRAL IOWA...
WAYNE COUNTY IN SOUTH CENTRAL IOWA...
* UNTIL 1000 PM CDT
* AT 352 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
WARNED AREA. DOPPLER RADAR INDICATES 1 TO 2 INCHES OF RAIN HAS
OCCURRED IN PARTS OF THE AREA.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
LAMONI...CORYDON...LEON AND SEYMOUR.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
ADDITIONAL RAINFALL AMOUNTS OF AROUND AN INCH ARE POSSIBLE IN THE
WARNED AREA.
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 4057 9401 4076 9401 4090 9356 4111 9310
4059 9309
$$3 follow-up statements
866
WGUS73 KDMX 252157
FFSDMX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
457 PM CDT WED MAY 25 2011
IAC053-117-185-260300-
/O.CON.KDMX.FF.W.0008.000000T0000Z-110526T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE IA-LUCAS IA-DECATUR IA-
457 PM CDT WED MAY 25 2011
...FLASH FLOOD WARNING FOR MINOR FLOODING OF POOR DRAINAGE AREAS
REMAINS IN EFFECT FOR DECATUR...SOUTHERN LUCAS AND WAYNE COUNTIES
UNTIL 1000 PM CDT...
AT 453 PM CDT...WEATHER SPOTTERS REPORTED THUNDERSTORMS WITH VERY
HEAVY RAINFALL ACROSS THE WARNED AREA. RAINFALL OF THREE QUARTERS TO
ONE AND ONE HALF INCHES HAS BEEN REPORTED IN MANY PARTS OF THE AREA.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
LAMONI...CORYDON...LEON AND SEYMOUR.
SPOTTERS OVER CENTRAL AND NORTH CENTRAL SECTION OF WAYNE COUNTY
REPORTED MINOR FLOODING. DITCHES WERE FILLED WITH WATER AND
CONSIDERABLE PONDING WAS REPORTED IN THE FARM FIELDS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THE HEAVIEST STORMS HAVE MOVED NORTHWEST OF THE AREA. SOME
ADDITIONAL RAINFALL IS LIKELY...HOWEVER ADDITIONAL HEAVY RAINFALL IS
NOW LIKELY.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. FLOOD WATERS ARE USUALLY DEEPER THAN THEY APPEAR AND THE
WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. TURN
AROUND...DONT DROWN.
&&
LAT...LON 4057 9401 4076 9401 4090 9356 4111 9310
4059 9309
$$977
WGUS73 KDMX 252256
FFSDMX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
556 PM CDT WED MAY 25 2011
IAC053-117-185-260300-
/O.CON.KDMX.FF.W.0008.000000T0000Z-110526T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE IA-LUCAS IA-DECATUR IA-
556 PM CDT WED MAY 25 2011
...FLASH FLOOD WARNING FOR MINOR FLOODING OF POOR DRAINAGE AREAS
REMAINS IN EFFECT FOR DECATUR...SOUTHERN LUCAS AND WAYNE COUNTIES
UNTIL 1000 PM CDT...
AT 556 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL HAVE ENDED ACROSS THE WARNED
AREA. HOWEVER...IT WILL TAKE TIME FOR THE EARLIER HEAVY RAINS TO
DRAIN AND FOR CREEKS AND RIVERS TO RECEDE.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
LAMONI...CORYDON...LEON AND SEYMOUR.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. FLOOD WATERS ARE USUALLY DEEPER THAN THEY APPEAR AND THE
WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. TURN
AROUND...DONT DROWN.
&&
LAT...LON 4057 9401 4076 9401 4090 9356 4111 9310
4059 9309
$$
LEE701
WGUS73 KDMX 252355
FFSDMX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
655 PM CDT WED MAY 25 2011
IAC053-117-185-260009-
/O.CAN.KDMX.FF.W.0008.000000T0000Z-110526T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE IA-LUCAS IA-DECATUR IA-
655 PM CDT WED MAY 25 2011
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR DECATUR...SOUTHERN
LUCAS AND WAYNE COUNTIES IS CANCELLED...
EXCESS RUNOFF FROM HEAVY RAIN HAS LARGELY ENDED OVER THE WARNED
AREA. STREAMS AND CREEKS IN THE WARNED AREA ARE BEGINNING TO SLOWLY
RECEDE...BUT IT WILL TAKE SOME TIME FOR RESIDUAL FLOODING TO CEASE
ESPECIALLY IN LOW LYING AREAS. IF FLOODING HAS BEEN
OBSERVED...PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.
LAT...LON 4057 9401 4076 9401 4090 9356 4111 9310
4059 9309
$$
LEEThe 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, 12:38 AM CDT | Flash Flood Warning | DMX | Clarke, Union | 6 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, 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.