Alert archive / Minnesota / Flash Flood Warnings in 2012

Flash Flood Warning 13, NWS Sioux Falls, SD

May 27, 2012Jackson County, Nobles County, Minnesota; Lyon County, Osceola County, Iowa

NWS Sioux Falls, SD issued this flash flood warning at May 27, 2012, 8:19 PM CDT for Jackson County, Nobles County, Minnesota; Lyon County, Osceola County, Iowa. It was in force for 7 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: May 27, 2012, 8:19 PM CDT (01:19 UTC)
Expired: May 28, 2012, 3:30 AM CDT
In force: 7 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: None

Counties Lyon County, IA, Osceola County, IA, Jackson County, MN, Nobles County, MN

The radar

The Sioux Falls radar (KFSD), 97 km from the middle of the area, began a volume at 01:21 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 27, 10:00 PM CDT	FLASH FLOOD	Adrian, MN	SMALL CREEK OVERFLOWED INTO CAMPGROUND ON NORTHWEST SIDE OF ADRIAN. STILL SOME STANDING WATER THIS MORNING.

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 00:00Z, 1.3 hours before the alert went out and 214 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: 1850 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 1669 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 285 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 17.0

Open this sounding in Storm Lab

The text

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

155 
WGUS53 KFSD 280119
FFWFSD
IAC119-143-MNC063-105-280730-
/O.NEW.KFSD.FF.W.0013.120528T0119Z-120528T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
819 PM CDT SUN MAY 27 2012

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN LYON COUNTY IN NORTHWEST IOWA
  NOBLES COUNTY IN SOUTHWEST MINNESOTA
  OSCEOLA COUNTY IN NORTHWEST IOWA
  WESTERN JACKSON COUNTY IN SOUTHWEST MINNESOTA

* UNTIL 230 AM CDT MONDAY

* AT 812 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. 
  RADAR ESTIMATES OF 1 TO 3 INCHES OF RAINFALL HAS ALREADY OCCURRED 
  ACROSS THE AREA. ADDITIONAL RAINFALL AMOUNTS OF AN INCH TO INCH 
  AND A HALF WILL BE LIKELY OVER THE NEXT COUPLE OF HOURS.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  WORTHINGTON...ADRIAN...ASHTON...BREWSTER...ELLSWORTH...GEORGE...
  HARRIS...HERON LAKE...LITTLE ROCK...OCHEYEDAN...ROUND LAKE...
  RUSHMORE AND SIBLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.

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 9536 4350 9539 4344 9538 4335 9541
      4328 9606 4373 9603 4385 9525

$$
WEISSER

2 follow-up statements

416 
WGUS53 KFSD 280330
FFWFSD
IAC119-143-MNC063-105-280830-
/O.EXT.KFSD.FF.W.0013.000000T0000Z-120528T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1030 PM CDT SUN MAY 27 2012

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  EASTERN LYON COUNTY IN NORTHWEST IOWA
  NOBLES COUNTY IN SOUTHWEST MINNESOTA
  OSCEOLA COUNTY IN NORTHWEST IOWA
  WESTERN JACKSON COUNTY IN SOUTHWEST MINNESOTA

* UNTIL 330 AM CDT

* AT 1025 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR 
INDICATED   THUNDERSTORMS WITH VERY HEAVY RAINFALL CONTINUE ACROSS 
THE WARNED AREA. AN ADDITIONAL INCH OF RAINFALL IS EXPECTED OVER THE 
WARNED AREA. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  WORTHINGTON...ADRIAN...ASHTON...BREWSTER...ELLSWORTH...GEORGE...
  HARRIS...HERON LAKE...LITTLE ROCK...OCHEYEDAN...ROUND LAKE...
  RUSHMORE AND SIBLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.

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 9536 4350 9539 4344 9538 4335 9541
      4328 9606 4373 9603 4385 9525

$$

151 
WGUS73 KFSD 280822
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
322 AM CDT MON MAY 28 2012

IAC119-143-MNC063-105-280837-
/O.EXP.KFSD.FF.W.0013.000000T0000Z-120528T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
OSCEOLA IA-LYON IA-JACKSON MN-NOBLES MN-
322 AM CDT MON MAY 28 2012

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NOBLES...WESTERN
JACKSON...EASTERN LYON AND OSCEOLA COUNTIES WILL BE ALLOWED TO EXPIRE
AT 330 AM 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 4350 9536 4350 9539 4344 9538 4335 9541
      4328 9606 4373 9603 4385 9525

$$

CHENARD

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 7:54 PM CDT	Severe Thunderstorm Warning	FSD	Nobles, Rock	36 min
May 27, 8:54 PM CDT	Severe Thunderstorm Warning	FSD	Cottonwood, Jackson	36 min
May 27, 7:11 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Sioux	34 min
May 27, 7:22 PM CDT	Flash Flood Warning	FSD	Lyon, Plymouth, Sioux	7 hr
May 27, 7:31 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Plymouth, Sioux	29 min
May 27, 9:18 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	27 min
May 27, 9:42 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Woodbury	10 min
May 28, 5:35 AM CDT	River Flood Warning	FSD	Lyon	52 hr
May 28, 5:35 AM CDT	River Flood Warning	FSD	Clay	71 hr
May 28, 5:35 AM CDT	River Flood Warning	FSD	Clay	8 days
May 28, 5:35 AM CDT	River Flood Warning	FSD	Buena Vista, Clay	9 days

Nearby

Flash Flood Warnings in Minnesota, 2012 Flash Flood Warnings in Iowa, 2012 Every flash flood warning in 2012

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.