Alert archive / Iowa / Flash Flood Warnings in 2011
Flash Flood Warning 8, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood warning at Jul 15, 2011, 5:49 PM CDT for Howard County, Mitchell County, Iowa. It was in force for 3 hr. 3 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
- Jul 15, 2011, 5:49 PM CDT (22:49 UTC)
- Expired
- Jul 15, 2011, 9:00 PM CDT
- In force
- 3 hr
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Flood severity
- None
Counties Howard County, IA, Mitchell County, IA
The radar
The La Crosse radar (KARX), 127 km from the middle of the area, began a volume at 22:49 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 |
|---|---|---|---|
| Jul 15, 6:15 PM CDT | HEAVY RAIN 2.83 | St. Ansgar, IA | 2 HOUR RAINFALL TOTAL. |
| Jul 15, 7:00 PM CDT | HEAVY RAIN 4.25 | St. Ansgar, IA | RAINFALL TOTAL IS 2 AND A HALF HOUR TOTAL. WIDESPREAD RURAL FLOODING OCCURING. |
| Jul 15, 7:55 PM CDT | HEAVY RAIN 3.85 | Osage, IA | RAINFALL TOTAL IS 3 HOUR AMOUNT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 10.8 hours before the alert went out and 180 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
- 1183 J/kg
- Mixed-layer CIN
- -78 J/kg
- Mixed-layer LCL
- 585 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 101 m²/s²
- 0-3 km storm-relative helicity
- 135 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.9
The text
As transmitted, in the capitals the NWS used until 2016.
830 WGUS53 KARX 152249 FFWARX IAC089-131-160200- /O.NEW.KARX.FF.W.0008.110715T2249Z-110716T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LA CROSSE WI 549 PM CDT FRI JUL 15 2011 THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A * FLASH FLOOD WARNING FOR... HOWARD COUNTY IN NORTHEAST IOWA... MITCHELL COUNTY IN NORTH CENTRAL IOWA... * UNTIL 900 PM CDT * THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUE TO FALL ACROSS FAR NORTHERN IOWA. RAINFALL OF 3 INCHES IS POSSIBLE WHICH WILL LEAD TO WATER RELATED PROBLEMS. ROADS COULD BE WASHED OUT AND PONDING IN FIELDS IS EXPECTED. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... CRESCO...OSAGE...ELMA...LIME SPRINGS...PROTIVIN...RICEVILLE... ST ANSGAR AND STACYVILLE. LAT...LON 4350 9303 4350 9209 4322 9208 4321 9302 $$ SHEA
3 follow-up statements
239 WGUS73 KARX 160005 FFSARX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 705 PM CDT FRI JUL 15 2011 IAC089-131-160200- /O.CON.KARX.FF.W.0008.000000T0000Z-110716T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MITCHELL IA-HOWARD IA- 705 PM CDT FRI JUL 15 2011 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR HOWARD AND MITCHELL COUNTIES UNTIL 900 PM CDT... AT 701 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. TWO AND ONE HALF INCHES OF RAIN HAS BEEN REPORTED SO FAR IN OSAGE. LOOK FOR ANOTHER 1 TO 2 INCHES OF RAINFALL THROUGH 800 PM AS ADDITIONAL THUNDERSTORMS MOVE ACROSS THE WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... CRESCO...OSAGE...ELMA...LIME SPRINGS...RICEVILLE...ST. ANSGAR AND STACYVILLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. && LAT...LON 4350 9303 4350 9209 4322 9208 4321 9302 $$ JW
042 WGUS73 KARX 160058 FFSARX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 758 PM CDT FRI JUL 15 2011 IAC089-131-160200- /O.CON.KARX.FF.W.0008.000000T0000Z-110716T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MITCHELL IA-HOWARD IA- 758 PM CDT FRI JUL 15 2011 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR HOWARD AND MITCHELL COUNTIES UNTIL 900 PM CDT... AT 751 PM CDT...WEATHER SPOTTERS REPORTED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. TRAINED SPOTTERS REPORTED 4 AND A QUARTER INCHES OF RAINFALL IN 2 AND A HALF HOURS IN ST. ANSGAR. THE THUNDERSTORMS HAVE TAPERED OFF WITH LIGHT ADDITIONAL RAINFALL AMOUNTS EXPECTED THROUGH 900 PM. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... CRESCO...OSAGE...ELMA...LIME SPRINGS...RICEVILLE...ST. ANSGAR AND STACYVILLE. 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. && LAT...LON 4350 9303 4350 9209 4322 9208 4321 9302 $$ JW
663 WGUS73 KARX 160155 FFSARX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 855 PM CDT FRI JUL 15 2011 IAC089-131-160210- /O.EXP.KARX.FF.W.0008.000000T0000Z-110716T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MITCHELL IA-HOWARD IA- 855 PM CDT FRI JUL 15 2011 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR HOWARD AND MITCHELL COUNTIES WILL BE ALLOWED TO EXPIRE AT 900 PM CDT... EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA AND PREVIOUS STREET FLOODING HAS IMPROVED. IF FLOODING HAS BEEN OBSERVED...PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY. LAT...LON 4350 9303 4350 9209 4322 9208 4321 9302 $$
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 3:57 AM CDT | Excessive Heat Watch | ARX | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 36 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.