Alert archive / Minnesota / Flash Flood Warnings in 2011

Flash Flood Warning 6, NWS Sioux Falls, SD

June 14, 2011Cottonwood County, Minnesota

NWS Sioux Falls, SD issued this flash flood warning at Jun 14, 2011, 1:35 PM CDT for Cottonwood County, Minnesota. It was in force for 3 hr. 1 report 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: Jun 14, 2011, 1:35 PM CDT (18:35 UTC)
Expired: Jun 14, 2011, 4:30 PM CDT
In force: 3 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: None

County Cottonwood County, MN

The radar

The Sioux Falls radar (KFSD), 133 km from the middle of the area, began a volume at 18:38 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
Jun 14, 2:00 PM CDT	FLASH FLOOD	9 N Westbrook, MN	5 COUNTY ROADS UNDERWATER IN NORTHWEST PORTION OF COUNTY

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, 6.6 hours before the alert went out and 156 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1476 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 45 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.

640 
WGUS53 KFSD 141835
FFWFSD
MNC033-142130-
/O.NEW.KFSD.FF.W.0006.110614T1835Z-110614T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
135 PM CDT TUE JUN 14 2011

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  COTTONWOOD COUNTY IN SOUTHWEST MINNESOTA

* UNTIL 430 PM CDT

* AT 125 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. ONE
  TO TWO INCHES OF RAIN HAS ALREADY FALLEN IN THE WARNED AREA IN A  
  VERY SHORT PERIOD OF TIME AND ANOTHER ONE OR TWO INCHES OF
  RAINFALL ARE EXPECTED.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  WINDOM...BINGHAM LAKE...JEFFERS...MOUNTAIN LAKE...STORDEN AND
  WESTBROOK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

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 4385 9546 4419 9546 4419 9511 4411 9510
      4411 9487 4386 9485

$$
BUSS

2 follow-up statements

501 
WGUS73 KFSD 141937
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
237 PM CDT TUE JUN 14 2011

MNC033-142130-
/O.CON.KFSD.FF.W.0006.000000T0000Z-110614T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COTTONWOOD MN-
237 PM CDT TUE JUN 14 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR COTTONWOOD COUNTY UNTIL
430 PM CDT...

AT 229 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. 
DOPPLER RADAR ESTIMATED 2 TO 4 INCHES OF RAIN FELL OVER MUCH OF 
COTTONWOOD COUNTY. AT 2 PM THE EMERGENCY MANAGER FOR COTTONWOOD 
COUNTY REPORTED 5 COUNTY ROADS UNDERWATER IN THE NORTHWEST CORNER
OF THE COUNTY.

SLOW MOVING THUNDERSTORMS ARE PRODUCING VERY HEAVY RAINFALL IN THE
WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH
FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING
INCLUDE...WINDOM...BINGHAM LAKE...JEFFERS...MOUNTAIN LAKE...STORDEN
AND WESTBROOK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLOODING OF SMALL CREEKS
AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS
AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING
AREAS ARE ALSO SUBJECT TO FLOODING.

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 4385 9546 4419 9546 4419 9511 4411 9510
      4411 9487 4386 9485

$$
BUSS

712 
WGUS73 KFSD 142133
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
433 PM CDT TUE JUN 14 2011

MNC033-142147-
/O.EXP.KFSD.FF.W.0006.000000T0000Z-110614T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COTTONWOOD MN-
433 PM CDT TUE JUN 14 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR COTTONWOOD COUNTY
HAS BEEN ALLOWED TO EXPIRE...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. IT 
APPEARS THE STRONGEST STORMS WILL REMAIN SOUTH OF COTTONWOOD COUNTY. 
STREAMS AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING 
TO RECEDE. IF FLOODING HAS BEEN OBSERVED...PLEASE REPORT IT TO YOUR 
LOCAL LAW ENFORCEMENT AGENCY. THE SITUATION WILL BE MONITORED 
CLOSELY...AND IF STORMS REDEVELOP...MORE FLASH FLOOD WARNINGS MAY 
HAVE TO BE ISSUED.

LAT...LON 4385 9546 4419 9546 4419 9511 4411 9510
      4411 9487 4386 9485

$$

MJF

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 14, 9:21 AM CDT	Flash Flood Warning	FSD	Nobles, Rock	2 hr
Jun 14, 11:24 AM CDT	Severe Thunderstorm Warning	FSD	Pipestone, Rock	36 min
Jun 14, 1:19 PM CDT	Flash Flood Warning	FSD	Murray, Pipestone	3 hr
Jun 14, 1:41 PM CDT	Flash Flood Warning	FSD	Rock	3 hr
Jun 14, 3:01 PM CDT	Flash Flood Warning	FSD	Jackson, Murray, Nobles	3 hr
Jun 14, 4:25 PM CDT	Flash Flood Warning	FSD	Pipestone, Rock	3 hr

Nearby

Flash Flood Warnings in Minnesota, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.