Alert archive / Minnesota / Areal Flood Advisories in 2011

Areal Flood Advisory 37, NWS Twin Cities, MN

July 27, 20114 counties in Minnesota

NWS Twin Cities, MN issued this areal flood advisory at Jul 27, 2011, 5:24 AM CDT for 4 counties in Minnesota. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Jul 27, 2011, 5:24 AM CDT (10:24 UTC)
Expired
Jul 27, 2011, 9:00 AM CDT
In force
4 hr
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon

Counties Blue Earth County, MN, Faribault County, MN, Martin County, MN, Watonwan County, MN

The radar

The Minneapolis radar (KMPX), 126 km from the middle of the area, began a volume at 10:26 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, 10.4 hours before the alert went out and 125 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 00:00Z on 2011-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2011-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1713 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
98 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 Jul 27, 4:16 AM CDT, 1 hour 8 minutes earlier.

Area forecast discussion, Jul 27, 4:16 AM CDT, 1 hour 8 minutes before
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Hazardous weather outlook, Jul 27, 1:06 AM CDT, 4 hours 18 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
106 AM CDT WED JUL 27 2011

MNZ041>045-047>070-073>078-082>085-091>093-WIZ014>016-023>028-
271100-
DOUGLAS-TODD-MORRISON-MILLE LACS-KANABEC-STEVENS-POPE-STEARNS-
BENTON-SHERBURNE-ISANTI-CHISAGO-LAC QUI PARLE-SWIFT-CHIPPEWA-
KANDIYOHI-MEEKER-WRIGHT-HENNEPIN-ANOKA-RAMSEY-WASHINGTON-
YELLOW MEDICINE-RENVILLE-MCLEOD-SIBLEY-CARVER-SCOTT-DAKOTA-
REDWOOD-BROWN-NICOLLET-LE SUEUR-RICE-GOODHUE-WATONWAN-BLUE EARTH-
WASECA-STEELE-MARTIN-FARIBAULT-FREEBORN-POLK-BARRON-RUSK-
ST. CROIX-PIERCE-DUNN-PEPIN-EAU CLAIRE-
106 AM CDT WED JUL 27 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL AND
SOUTHERN MINNESOTA... AND WEST CENTRAL WISCONSIN.

.DAY ONE...OVERNIGHT

SEVERE THUNDERSTORMS ARE STILL POSSIBLE OVER PORTIONS OF SOUTHERN
AND CENTRAL MINNESOTA OVERNIGHT AS LOW PRESSURE MOVES TOWARD
WESTERN MINNESOTA. STRONG WINDS WOULD BE THE MAIN SEVERE WEATHER
THREAT. IN ADDITION...HEAVY RAIN IS LIKELY WITH THE STRONGER
STORMS...WHICH COULD CAUSE FLOODING. AREAS UNDER THE GREATEST
THREAT OF HEAVY RAIN WOULD BE PORTIONS OF CENTRAL MINNESOTA.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THUNDERSTORMS WILL LINGER OVER PARTS OF SOUTH CENTRAL AND EAST
CENTRAL MINNESOTA AND WEST CENTRAL WISCONSIN WEDNESDAY
MORNING...WITH HEAVY RAIN STILL POSSIBLE.

THERE IS A SLIGHT RISK FOR SEVERE WEATHER FROM SOUTH CENTRAL
MINNESOTA INTO WEST CENTRAL WISCONSIN...MAINLY DURING THE
AFTERNOON AND EVENING. THE NEXT THREAT FOR THUNDERSTORMS ACROSS THE
OUTLOOK AREA WILL BE SUNDAY AND MONDAY.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION MAY BE NEEDED.

In the hours before

Special weather statement, Jul 27, 2:22 AM CDT, 3 hours 2 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
222 AM CDT WED JUL 27 2011

MNZ044-045-052-053-061-WIZ014-270745-
ANOKA-CHISAGO-ISANTI-KANABEC-MILLE LACS-POLK-
222 AM CDT WED JUL 27 2011

...HEAVY RAIN DEVELOPING OVER ANOKA...CHISAGO...ISANTI...KANABEC...
MILLE LACS AND POLK COUNTIES THROUGH 245 AM CDT...

AT 217 AM CDT...WEATHER SERVICE RADAR WAS TRACKING STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 4 MILES NORTH OF ISLE TO
LEWIS LAKE TO 3 MILES NORTHEAST OF EAST BETHEL. THESE STORMS WERE
MOVING EAST AT 30 MPH.

WINDS UP TO 50 MPH ARE EXPECTED WITH THESE STORMS.

* LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
  BODUM.
  WARMAN.
  WYOMING.
  QUAMBA.
  HARRIS.

LAT...LON 4616 9342 4615 9304 4598 9304 4597 9313
      4574 9314 4573 9287 4565 9287 4565 9284
      4537 9275 4528 9329 4577 9349 4626 9359
      4626 9344
TIME...MOT...LOC 0721Z 262DEG 25KT 4621 9341 4578 9335
          4536 9311
Local storm report, Jul 27, 2:41 AM CDT, 2 hours 43 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
241 AM CDT WED JUL 27 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0239 AM     HAIL             ST FRANCIS              45.38N 93.36W
07/27/2011  M0.75 INCH       ANOKA              MN   TRAINED SPOTTER

&&

AZ
Special weather statement, Jul 27, 3:16 AM CDT, 2 hours 8 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
316 AM CDT WED JUL 27 2011

MNZ073>075-083-270915-
BLUE EARTH-BROWN-NICOLLET-REDWOOD-
316 AM CDT WED JUL 27 2011

...THUNDERSTORMS MOVING OVER BLUE EARTH...BROWN...NICOLLET AND
REDWOOD COUNTIES THROUGH 415 AM CDT...

AT 312 AM CDT...WEATHER SERVICE RADAR WAS TRACKING A CLUSTER OF
STRONG THUNDERSTORM NEAR SPRINGFIELD. THESE STORMS WERE MOVING EAST
AT 35 MPH.

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

* LOCATIONS IN OR NEAR THE PATH OF THES STORMS INCLUDE...
  SPRINGFIELD.
  MORGAN.
  COBDEN.
  EVAN.
  SLEEPY EYE.
  NEW ULM.

LAT...LON 4441 9514 4446 9432 4445 9427 4415 9432
      4414 9511
TIME...MOT...LOC 0814Z 256DEG 31KT 4427 9498
Special weather statement, Jul 27, 3:49 AM CDT, 1 hour 35 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 26, 8:56 PM CDTSpecial Weather StatementMPXDouglas, Stevens64 min
Jul 26, 9:36 PM CDTSevere Thunderstorm WarningMPXChippewa, Lac qui Parle, Pope, Stevens, Swift54 min
Jul 26, 10:26 PM CDTSevere Thunderstorm WarningMPXChippewa, Douglas, Lac qui Parle, Pope, Stevens, Swift79 min
Jul 26, 11:59 PM CDTSevere Thunderstorm WarningMPXKandiyohi, Pope, Stearns, Swift61 min
Jul 27, 12:04 AM CDTFlash Flood WatchMPXAnoka, Benton, Carver, Chippewa, Chisago, Dakota and 20 more9 hr
Jul 27, 2:22 AM CDTSpecial Weather StatementMPXChisago, Isanti, Kanabec23 min
Jul 27, 3:16 AM CDTSpecial Weather StatementMPXBrown59 min
Jul 27, 3:49 AM CDTSpecial Weather StatementMPXBrown, McLeod, Nicollet, Sibley56 min

Nearby

Areal Flood Advisories in Minnesota, 2011Every 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.