Alert archive / Iowa / Flash Flood Warnings in 2011
Flash Flood Warning 5, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at May 11, 2011, 4:42 PM CDT for Adams County, Taylor County, Iowa. It was in force for 6 hr. 2 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, 4:42 PM CDT (21:42 UTC)
- Expired
- May 11, 2011, 10:30 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), 134 km from the middle of the area, began a volume at 21:42 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, 5:32 PM CDT | FLASH FLOOD | 4 Wnw Lenox, IA | ADAMS COUNTY LAW ENFORCEMENT REPORTED ADAMS-TAYLOR COUNTY LINE ROAD WAS IMPASSIBLE BETWEEN POPLAR AVE AND ORANGE AVE. |
| May 11, 6:15 PM CDT | FLASH FLOOD | 4 N Gravity, IA | 10 MILES NORTH OF BEDFORD ALONG HIGHWAY 148 NEAR 150TH ST. BRIDGE SCOUR. DOT REPORTS HIGHWAY 148 CLOSED BETWEEN CORNING AND BEDFORD. |
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, 9.7 hours before the alert went out and 147 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.
410
WGUS53 KDMX 112142
FFWDMX
IAC003-173-120330-
/O.NEW.KDMX.FF.W.0005.110511T2142Z-110512T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
442 PM CDT WED MAY 11 2011
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EASTERN ADAMS COUNTY IN SOUTHWEST IOWA...
TAYLOR COUNTY IN SOUTHWEST IOWA...
* UNTIL 1030 PM CDT
* AT 441 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
WARNED AREA. RAINFALL RATES OF 2 TO 3 INCHES PER HOUR WILL OCCUR
WITHIN THE WARNED AREA.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
BEDFORD...CORNING AND LENOX.
LAT...LON 4057 9491 4079 9494 4079 9479 4116 9476
4116 9447 4058 9448
$$
PODRAZIK5 follow-up statements
378
WGUS73 KDMX 112251
FFSDMX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
551 PM CDT WED MAY 11 2011
IAC003-173-120330-
/O.CON.KDMX.FF.W.0005.000000T0000Z-110512T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TAYLOR IA-ADAMS IA-
551 PM CDT WED MAY 11 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR EASTERN ADAMS AND TAYLOR
COUNTIES UNTIL 1030 PM CDT...
AT 550 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.
RAINFALL RATES OF 2 TO 3 INCHES PER HOUR WILL CONTINUE ACROSS
EASTERN PORTIONS OF ADAMS COUNTY AND NORTHEAST TAYLOR COUNTY.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
BEDFORD...CORNING AND LENOX.
AT 530 PM CDT...LOCAL LAW ENFORCEMENT REPORTED THE ADAMS TAYLOR
COUNTY LINE ROAD WAS IMPASSIBLE FROM ORANGE TO POPLAR AVENUE.
LAT...LON 4057 9491 4079 9494 4079 9479 4116 9476
4116 9447 4058 9448
$$
PODRAZIK087
WGUS73 KDMX 120004
FFSDMX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
704 PM CDT WED MAY 11 2011
IAC003-173-120330-
/O.CON.KDMX.FF.W.0005.000000T0000Z-110512T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TAYLOR IA-ADAMS IA-
704 PM CDT WED MAY 11 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR EASTERN ADAMS AND TAYLOR
COUNTIES UNTIL 1030 PM CDT...
AT 703 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED THAT FLASH
FLOODING WAS OCCURRING THROUGHOUT PORTIONS OF SOUTHEAST ADAMS COUNTY
AND NORTHEAST TAYLOR COUNTY. THE HEAVY RAIN HAS PUSHED OFF TO THE
NORTHEAST...SO CONDITIONS ARE EXPECTED TO IMPROVE OVER THE NEXT
COUPLE OF HOURS.
SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
BEDFORD...CORNING AND LENOX.
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 9491 4079 9494 4079 9479 4116 9476
4116 9447 4058 9448
$$
PODRAZIK332
WGUS73 KDMX 120022
FFSDMX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
722 PM CDT WED MAY 11 2011
IAC003-173-120330-
/O.CON.KDMX.FF.W.0005.000000T0000Z-110512T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TAYLOR IA-ADAMS IA-
722 PM CDT WED MAY 11 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR EASTERN ADAMS AND
NORTHEASTERN TAYLOR COUNTIES UNTIL 1030 PM CDT...
AT 700 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED THAT FLASH
FLOODING WAS OCCURRING IN THROUGHOUT PORTIONS OF SOUTHEAST ADAMS
COUNTY AND NORTHEAST TAYLOR COUNTY. THE HEAVY RAIN HAS PUSHED OFF TO
THE NORTHEAST...SO CONDITIONS ARE EXPECTED TO IMPROVE OVER THE NEXT
COUPLE OF HOURS.
SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...CORNING
AND LENOX.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. FLOOD WATERS ARE USUALLY DEEPER THAN THEY APPEAR AND THE
WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. TURN
AROUND...DONT DROWN.
&&
LAT...LON 4072 9448 4072 9473 4079 9479 4116 9476
4116 9447
$$
PODRAZIK420
WGUS73 KDMX 120251
FFSDMX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
951 PM CDT WED MAY 11 2011
IAC003-173-120330-
/O.CON.KDMX.FF.W.0005.000000T0000Z-110512T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TAYLOR IA-ADAMS IA-
951 PM CDT WED MAY 11 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR EASTERN ADAMS AND
NORTHEASTERN TAYLOR COUNTIES UNTIL 1030 PM CDT...
AT 947 PM CDT...FLOODING MAY CONTINUE FROM PREVIOUS HEAVY RAINS
EARLIER THIS EVENING. NATIONAL WEATHER SERVICE DOPPLER RADAR
ESTIMATES INDICATED THAT TWO TO FIVE INCHES OF RAIN MAY HAVE FALLEN
IN THE WARNED AREA. THE IOWA DEPARTMENT OF TRANSPORTATION REPORTED
THAT HIGHWAY 148 WAS CLOSED BETWEEN CORNING AND BEDFORD DUE TO A
BRIDGE BEING SCOURED OUT NEAR 150TH STREET.
SOME LOCATIONS THAT MAY EXPERIENCE FLASH FLOODING INCLUDE THE WEST
BRANCH OF THE 102 RIVER...MIDDLE BRANCH 102 RIVER AND THEIR SMALLER
TRIBUTARIES.
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 4072 9448 4072 9473 4079 9479 4116 9476
4116 9447
$$
SMALL028
WGUS73 KDMX 120324
FFSDMX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1024 PM CDT WED MAY 11 2011
IAC003-173-120340-
/O.EXP.KDMX.FF.W.0005.000000T0000Z-110512T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TAYLOR IA-ADAMS IA-
1024 PM CDT WED MAY 11 2011
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR EASTERN ADAMS AND
NORTHEASTERN TAYLOR COUNTIES WILL BE ALLOWED TO EXPIRE AT 1030 PM
CDT...
EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.
LAT...LON 4072 9448 4072 9473 4079 9479 4116 9476
4116 9447
$$
SMALLThe 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, 2:43 PM CDT | Flash Flood Warning | DMX | Adams, Taylor | 6 hr |
| 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, 4:50 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.