Alert archive / Iowa / Flash Flood Warnings in 2011

Flash Flood Warning 9, NWS Des Moines, IA

May 25, 2011Appanoose County, Davis County, Wapello County, Iowa

NWS Des Moines, IA issued this flash flood warning at May 25, 2011, 4:34 PM CDT for Appanoose County, Davis County, Wapello County, Iowa. It was in force for 4 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, 4:34 PM CDT (21:34 UTC)
Expired: May 25, 2011, 8:30 PM CDT
In force: 4 hr
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Flood severity: None

Counties Appanoose County, IA, Davis County, IA, Wapello County, IA

The radar

The Des Moines radar (KDMX), 144 km from the middle of the area, began a volume at 21:37 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, 9.6 hours before the alert went out and 331 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

121 
WGUS53 KDMX 252134
FFWDMX
IAC007-051-179-260330-
/O.NEW.KDMX.FF.W.0009.110525T2134Z-110526T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
434 PM CDT WED MAY 25 2011

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN APPANOOSE COUNTY IN SOUTH CENTRAL IOWA...
  NORTHERN DAVIS COUNTY IN SOUTHEAST IOWA...
  SOUTHERN WAPELLO COUNTY IN SOUTHEAST IOWA...

* UNTIL 1030 PM CDT

* AT 431 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE      
  WARNED AREA. DOPPLER RADAR INDICATED RAINFALL RATES OF OVER 2      
  INCHES PER HOUR OVER PARTS OF THE AREA.  AN ADDITIONAL 1 TO 2      
  INCHES POSSIBLE IN THE NEXT 90 MINUTES.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  BLOOMFIELD AND ELDON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4070 9218 4076 9273 4090 9271 4090 9264
      4098 9264 4099 9218

$$

4 follow-up statements

419 
WGUS73 KDMX 252225
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
525 PM CDT WED MAY 25 2011

IAC007-051-179-260330-
/O.CON.KDMX.FF.W.0009.000000T0000Z-110526T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAPELLO IA-APPANOOSE IA-DAVIS IA-
525 PM CDT WED MAY 25 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHERN DAVIS...
NORTHEASTERN APPANOOSE AND SOUTHERN WAPELLO COUNTIES UNTIL 1030 PM
CDT...

AT 522 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED 
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. 
TRAINED SPOTTERS REPORTED RAINFALL OF 2 TO 3 INCHES IN THE PAST TWO 
HOURS NEAR AND SOUTH OF ELDON IN WAPELLO COUNTY.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH  FLOODING INCLUDE...
BLOOMFIELD AND ELDON.

NO FLASH FLOODING HAS BEEN REPORTED...HOWEVER REPORTS OF FULL 
DITCHES AND CONSIDERABLE PONDING OF WATER IN FARM FIELDS HAVE BEEN 
RECEIVE.  SMALL CREEKS WERE REPORTED NEAR BANKFULL WITH A FEW JUST 
BEGINNING TO FLOOD.

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 4070 9218 4076 9273 4090 9271 4090 9264
      4098 9264 4099 9218

$$

152 
WGUS73 KDMX 252332
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
632 PM CDT WED MAY 25 2011

IAC007-051-179-260330-
/O.CON.KDMX.FF.W.0009.000000T0000Z-110526T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAPELLO IA-APPANOOSE IA-DAVIS IA-
632 PM CDT WED MAY 25 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHERN DAVIS...
NORTHEASTERN APPANOOSE AND SOUTHERN WAPELLO COUNTIES UNTIL 1030 PM
CDT...

AT 630 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS WITH VERY HEAVY RAINFALL HAD ENDED ACROSS THE AREA. 
HOWEVER...LIGHT TO MODERATE RAIN WILL CONTINUE FOR SOME TIME AND 
WILL ADD TO THE ESTIMATED 2 TO 4 INCHES OF RAIN THAT FELL IN THE 
EARLIER STORMS.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO 
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH  FLOODING INCLUDE...
BLOOMFIELD AND ELDON.

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 4070 9218 4076 9273 4090 9271 4090 9264
      4098 9264 4099 9218

$$

LEE

415 
WGUS73 KDMX 260026
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
726 PM CDT WED MAY 25 2011

IAC007-051-179-260330-
/O.CON.KDMX.FF.W.0009.000000T0000Z-110526T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAPELLO IA-APPANOOSE IA-DAVIS IA-
726 PM CDT WED MAY 25 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHERN DAVIS...
NORTHEASTERN APPANOOSE AND SOUTHERN WAPELLO COUNTIES UNTIL 1030 PM
CDT...

AT 725 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT THUNDERSTORMS WITH VERY HEAVY RAINFALL HAVE LARGELY ENDED 
ACROSS THE WARNED AREA. HOWEVER...LIGHT TO MODERATE RAIN CONTINUES 
TO FALL ACROSS THE AREA AND IT WILL TAKE SOME TIME FOR RUNOFF FROM 
THE EARLIER HEAVY RAIN TO CEASE.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH  FLOODING INCLUDE...
BLOOMFIELD AND ELDON.

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 4070 9218 4076 9273 4090 9271 4090 9264
      4098 9264 4099 9218

$$

LEE

642 
WGUS73 KDMX 260130
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
830 PM CDT WED MAY 25 2011

IAC007-051-179-260145-
/O.CAN.KDMX.FF.W.0009.000000T0000Z-110526T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAPELLO IA-APPANOOSE IA-DAVIS IA-
830 PM CDT WED MAY 25 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHERN DAVIS...
NORTHEASTERN APPANOOSE AND SOUTHERN WAPELLO 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 4070 9218 4076 9273 4090 9271 4090 9264
      4098 9264 4099 9218

$$

LEE

The 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, 3:53 PM CDT	Flash Flood Warning	DMX	Decatur, Lucas, Wayne	3 hr

Nearby

Flash Flood Warnings in Iowa, 2011 Every 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.