Alert archive / Minnesota / Flash Flood Warnings in 2011

Flash Flood Warning 22, NWS Sioux Falls, SD

July 1, 2011Lyon County, Murray County, Minnesota

NWS Sioux Falls, SD issued this flash flood warning at Jul 1, 2011, 4:02 PM CDT for Lyon County, Murray 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
Jul 1, 2011, 4:02 PM CDT (21:02 UTC)
Expired
Jul 1, 2011, 7:00 PM CDT
In force
3 hr
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Flood severity
None

Counties Lyon County, MN, Murray County, MN

The radar

The Sioux Falls radar (KFSD), 111 km from the middle of the area, began a volume at 21:05 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

TimeReportWhereRemark
Jul 1, 5:00 PM CDTFLASH FLOODMarshall, MNSTREET FLOODING ON BRUCE STREET

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, 9.0 hours before the alert went out and 186 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2011-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3970 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2011-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
3970 J/kg
Mixed-layer CIN
-245 J/kg
Mixed-layer LCL
1089 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
21 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.7

Open this sounding in Storm Lab

The text

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

419 
WGUS53 KFSD 012102
FFWFSD
MNC083-101-020000-
/O.NEW.KFSD.FF.W.0022.110701T2102Z-110702T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
402 PM CDT FRI JUL 1 2011

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  LYON COUNTY IN SOUTHWEST MINNESOTA
  NORTHWESTERN MURRAY COUNTY IN SOUTHWEST MINNESOTA

* UNTIL 700 PM CDT

* AT 401 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS WILL MOVE INTO THE 
  WARNED AREA. RAINFALL AMOUNTS OF 2 TO 3 INCHES OF RAINFALL WILL BE 
  POSSIBLE IN ONE HOUR AS THE STORMS PASS.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MARSHALL...BALATON...CAMDEN STATE PARK...COTTONWOOD...FLORENCE...
  GHENT...MINNEOTA...RUSSELL AND TRACY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

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.

&&

LAT...LON 4454 9558 4421 9559 4420 9553 4419 9553
      4412 9606 4419 9606 4420 9608 4434 9608
      4435 9609 4454 9608 4457 9609 4463 9560

$$
2 follow-up statements
037 
WGUS73 KFSD 012223
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
523 PM CDT FRI JUL 1 2011

MNC083-101-020000-
/O.CON.KFSD.FF.W.0022.000000T0000Z-110702T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LYON MN-MURRAY MN-
523 PM CDT FRI JUL 1 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHWESTERN MURRAY AND
LYON COUNTIES UNTIL 700 PM CDT...

AT 517 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. 
DOPPLER RADAR ESTIMATED AROUND TWO INCHES OF RAIN FELL IN AN HOUR OR 
LESS. ADDITIONAL SHOWERS AND THUNDERSTORMS MAY BRING ANOTHER HALF TO 
THREE QUARTERS OF AN INCH OF RAIN THROUGH 700 PM CDT.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO 
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING 
INCLUDE...MARSHALL...BALATON...CAMDEN STATE 
PARK...COTTONWOOD...CURRENT 
LAKE...FLORENCE...GHENT...MINNEOTA...RUSSELL AND TRACY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE MINOR FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 4454 9558 4421 9559 4420 9553 4419 9553
      4412 9606 4419 9606 4420 9608 4434 9608
      4435 9609 4454 9608 4457 9609 4463 9560

$$

WEISSER
385 
WGUS73 KFSD 012352
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
652 PM CDT FRI JUL 1 2011

MNC083-101-020007-
/O.EXP.KFSD.FF.W.0022.000000T0000Z-110702T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LYON MN-MURRAY MN-
652 PM CDT FRI JUL 1 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHWESTERN MURRAY
AND LYON COUNTIES WILL BE ALLOWED TO EXPIRE AT 700 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 4454 9558 4421 9559 4420 9553 4419 9553
      4412 9606 4419 9606 4420 9608 4434 9608
      4435 9609 4454 9608 4457 9609 4463 9560

$$

WEISSER

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 3:13 PM CDTSevere Thunderstorm WarningFSDLincoln, Pipestone62 min
Jul 1, 3:31 PM CDTTornado WarningFSDLincoln, Pipestone29 min
Jul 1, 3:41 PM CDTFlash Flood WarningFSDLincoln, Pipestone100 min
Jul 1, 3:51 PM CDTSevere Thunderstorm WarningFSDLincoln, Lyon, Murray39 min
Jul 1, 3:53 PM CDTTornado WarningFSDLincoln21 min
Jul 1, 4:13 PM CDTSevere Thunderstorm WarningFSDLyon32 min
Jul 1, 5:05 PM CDTSevere Thunderstorm WarningFSDMurray, Nobles, Pipestone, Rock25 min
Jul 1, 5:44 PM CDTSevere Thunderstorm WarningFSDCottonwood, Jackson, Murray, Nobles46 min
Jul 1, 6:27 PM CDTSevere Thunderstorm WarningFSDCottonwood16 min

Nearby

Flash Flood Warnings in Minnesota, 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.