Alert archive / Minnesota / Areal Flood Advisories in 2011

Areal Flood Advisory 51, NWS Twin Cities, MN

August 13, 20114 counties in Minnesota

NWS Twin Cities, MN issued this areal flood advisory at Aug 13, 2011, 1:36 AM CDT for 4 counties in Minnesota. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Aug 13, 2011, 1:36 AM CDT (06:36 UTC)
Expired: Aug 13, 2011, 4:30 AM CDT
In force: 3 hr
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon

Counties Carver County, MN, Hennepin County, MN, Ramsey County, MN, Scott County, MN

The radar

The Minneapolis radar (KMPX), 7 km from the middle of the area, began a volume at 06:39 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.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 6.6 hours before the alert went out and 10 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: 225 J/kg
Mixed-layer CIN: -102 J/kg
Mixed-layer LCL: 1194 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Twin Cities, MN wrote its last area forecast discussion before this areal flood advisory went out at Aug 13, 12:26 AM CDT, 1 hour 10 minutes earlier.

Area forecast discussion, Aug 13, 12:26 AM CDT, 1 hour 10 minutes before

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Hazardous weather outlook, Aug 13, 12:33 AM CDT, 1 hour 3 minutes before

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In the hours before

Special weather statement, Aug 12, 7:42 PM CDT, 5 hours 54 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
742 PM CDT FRI AUG 12 2011

MNZ041-047-048-054>056-064-130245-
CHIPPEWA-DOUGLAS-LAC QUI PARLE-POPE-STEVENS-SWIFT-YELLOW MEDICINE-
742 PM CDT FRI AUG 12 2011

...THUNDERSTORMS MOVING INTO CHIPPEWA...DOUGLAS...LAC QUI
PARLE...POPE...STEVENS...SWIFT AND YELLOW MEDICINE COUNTIES THROUGH
945 PM CDT...

AT 741 PM CDT...WEATHER SERVICE RADAR WAS TRACKING STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 10 MILES NORTHWEST OF ELBOW
LAKE TO DONNELLY TO 3 MILES SOUTH OF ASTORIA. THESE STORMS WERE
MOVING EAST AT 20 MPH.

ONE HALF INCH DIAMETER HAIL AND WINDS UP TO 40 MPH ARE EXPECTED WITH
THESE STORMS.

* LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
  BELLINGHAM.
  DONNELLY.
  LOUISBURG.
  MADISON.
  BURR.
  APPLETON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO THE
STORM TO BE STRUCK BY LIGHTNING. SEEK SAFE SHELTER.

&&

LAT...LON 4500 9646 4526 9635 4522 9611 4540 9613
      4542 9625 4577 9617 4577 9577 4612 9576
      4611 9515 4547 9513 4541 9514 4541 9526
      4490 9525 4488 9548 4476 9549 4469 9537
      4455 9536 4454 9560 4462 9562 4463 9645
TIME...MOT...LOC 0042Z 276DEG 19KT 4611 9608 4569 9603
          4452 9654

Special weather statement, Aug 12, 8:50 PM CDT, 4 hours 46 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
850 PM CDT FRI AUG 12 2011

MNZ041>043-048-049-054>057-064-065-073-130300-
CHIPPEWA-DOUGLAS-KANDIYOHI-LAC QUI
PARLE-MORRISON-POPE-REDWOOD-RENVILLE-STEARNS-SWIFT-TODD-YELLOW
MEDICINE-
850 PM CDT FRI AUG 12 2011

...THUNDERSTORMS MOVING INTO/DEVELOPING OVER CHIPPEWA...DOUGLAS...
KANDIYOHI...LAC QUI PARLE...MORRISON...POPE...REDWOOD...RENVILLE...
STEARNS...SWIFT...TODD AND YELLOW MEDICINE COUNTIES THROUGH 1000 PM
CDT...

AT 840 PM CDT...ALONG A LINE EXTENDING FROM 3 MILES EAST OF PARKERS
PRAIRIE TO 5 MILES SOUTH OF DANVERS TO 5 MILES NORTHEAST OF HAZEL RUN
TO 5 MILES WEST OF RUSSELL. WERE MOVING EAST AT 30 MPH.

HAIL UP TO DIME SIZE AND WINDS BETWEEN 40 AND 50 MPH ARE POSSIBLE
WITH THIS LONG LINE OF STORMS.

* LOCATIONS IN OR NEAR THE PATH OF INCLUDE...
  GRANITE FALLS.
  WILLMAR.
  WOOD LAKE.
  BENSON.
  LONG PRAIRIE.
  MILTONA.
  LONG BEACH.
  ROSE CITY.
  SWIFT FALLS.
  EAGLE BEND.
  GILCHRIST.

&&

LAT...LON 4516 9488 4475 9488 4421 9519 4423 9560
      4462 9561 4464 9590 4481 9576 4521 9582
      4612 9540 4611 9516 4626 9515 4627 9444
TIME...MOT...LOC 0145Z 273DEG 23KT 4616 9523 4520 9568
          4481 9562 4433 9600

CLF

Special weather statement, Aug 12, 9:44 PM CDT, 3 hours 52 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
944 PM CDT FRI AUG 12 2011

MNZ065>067-073>075-130330-
BROWN-MCLEOD-NICOLLET-REDWOOD-RENVILLE-SIBLEY-
944 PM CDT FRI AUG 12 2011

AT 940 PM CDT...WEATHER SERVICE RADAR WAS TRACKING STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 4 MILES SOUTHWEST OF DANUBE
TO 3 MILES NORTH OF NORTH REDWOOD TO 3 MILES SOUTHEAST OF WABASSO.
THESE STORMS WERE MOVING EAST AT 30 MPH.

HAIL UP TO DIME SIZE AND WINDS UP TO 50 MPH ARE EXPECTED WITH THESE
STORMS.

* LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
  NORTH REDWOOD.
  MORTON.
  CLEMENTS.
  FRANKLIN.
  MORGAN.
  FAIRFAX.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE GUSTY WINDS WILL BE CAPABLE OF KNOCKING DOWN SMALL TREES...TREE
LIMBS...AND POWERLINES. SEEK SAFE SHELTER UNTIL THE STORM HAS PASSED.

&&

LAT...LON 4475 9448 4457 9442 4430 9459 4437 9530
      4462 9518 4471 9524
TIME...MOT...LOC 0243Z 274DEG 28KT 4474 9511 4461 9504
          4438 9517

CLF

Special weather statement, Aug 12, 11:11 PM CDT, 2 hours 25 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1111 PM CDT FRI AUG 12 2011

MNZ058-059-066-068-130500-
CARVER-MCLEOD-MEEKER-WRIGHT-
1111 PM CDT FRI AUG 12 2011

AT 1108 PM CDT...WEATHER SERVICE RADAR WAS TRACKING A STRONG
THUNDERSTORM 4 MILES SOUTHWEST OF COKATO. THIS STORM WAS MOVING EAST
AT 30 MPH.

HAIL UP TO DIME SIZE AND WINDS UP TO 50 MPH ARE EXPECTED WITH THIS
STORM.

* LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...
  STOCKHOLM.
  SMITH LAKE.
  HOWARD LAKE.
  WAVERLY.
  MONTROSE.
  WATERTOWN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

&&

LAT...LON 4512 9382 4490 9383 4495 9433 4509 9434
TIME...MOT...LOC 0411Z 276DEG 27KT 4503 9420

CLF

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 12, 7:42 PM CDT	Special Weather Statement	MPX	Chippewa, Douglas, Lac qui Parle, Pope, Stevens, Swift and 1 more	2 hr
Aug 12, 8:50 PM CDT	Special Weather Statement	MPX	Chippewa, Douglas, Kandiyohi, Pope, Redwood, Renville and 2 more	70 min
Aug 12, 9:44 PM CDT	Special Weather Statement	MPX	Redwood, Renville	46 min
Aug 12, 11:11 PM CDT	Special Weather Statement	MPX	Wright	49 min
Aug 13, 2:02 PM CDT	Special Weather Statement	MPX	Anoka, Benton, Chisago, Hennepin, Isanti, Kanabec and 4 more	88 min
Aug 13, 3:46 PM CDT	Special Weather Statement	MPX	Anoka, Chisago, Dakota, Isanti, Kanabec, Mille Lacs and 2 more	89 min

Nearby

Areal Flood Advisories in Minnesota, 2011 Every areal flood advisory 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.