Alert archive / Minnesota / Special Weather Statements in 2009
Special Weather Statement, NWS Twin Cities, MN
NWS Twin Cities, MN issued this special weather statement at Aug 25, 2009, 2:42 AM CDT for Blue Earth County, Martin County, Watonwan County, Minnesota. It was in force for 63 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 25, 2009, 2:42 AM CDT (07:42 UTC)
- Expired
- Aug 25, 2009, 3:45 AM CDT
- In force
- 63 min
- Issued by
- NWS Twin Cities, MN
Counties Blue Earth County, MN, Martin County, MN, Watonwan County, MN
The radar
The Minneapolis radar (KMPX), 139 km from the middle of the area, began a volume at 07:43 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
Omaha, NE (KOAX), launched 00:00Z, 7.7 hours before the alert went out and 315 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.
- Mixed-layer CAPE
- 2098 J/kg
- Mixed-layer CIN
- -282 J/kg
- Mixed-layer LCL
- 1196 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 138 m²/s²
- 0-3 km storm-relative helicity
- 200 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at Aug 24, 10:51 PM CDT, 3 hours 51 minutes earlier.
Area forecast discussion, Aug 24, 10:51 PM CDT, 3 hours 51 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 1051 PM CDT MON AUG 24 2009 .AVIATION... /06Z TAF ISSUANCE/ A COLD FRONT WILL BE NEAR KAXN AT THE START OF THE PERIOD. THE FRONT WILL BE MOVING SLOWLY ESE OVERNIGHT AND PASS KMSP AROUND 14Z AND KEAU BY 18Z. WARM LAYER ALOFT STILL INHIBITING CONVECTIVE ACTIVITY. HOWEVER...AS THE NIGHT PROGRESSES HEIGHT FALLS AND COOLER TEMPERATURES WILL SPREAD IN WITH SHOWERS AND A FEW THUNDERSTORMS BECOMING MORE WIDESPREAD. MAIN CONCERN OVERNIGHT AND TUESDAY MORNING WILL BE MVFR CEILINGS IN THE WAKE OF THE FRONT. THIS HAS BEEN SHOWN WELL IN THE GFS LAMP GUIDANCE. AS A RESULT...HAVE KEPT THE TREND FROM EARLIER FORECAST ON CEILINGS IN THE 020-025 FOOT RANGE FOR A TIME IN THE WAKE OF THE FRONT. NORTHWEST WINDS WILL TURN NORTH TUESDAY AFTERNOON AND BECOME LIGHT NE TUESDAY NIGHT. && .DISCUSSION... /ISSUED 332 PM CDT MON AUG 24 2009/ A COLD FRONT STRETCHING FROM EASTERN ND THROUGH WESTERN NE AT MID AFTERNOON WILL PUSH INTO WEST CENTRAL MN THIS EVENING AND REACH THE TWIN CITIES AROUND DAYBREAK TUESDAY. THE FRONT WILL PASS ACROSS WEST CENTRAL WI AND SOUTH CENTRAL MN TUESDAY MORNING. MOISTURE IS INCREASING AHEAD OF THE FRONT WITH WV IMAGERY SHOWING A TROPICAL PLUME FROM MEXICO TO THE WESTERN DAKOTAS. A STRONG INCREASE IS SEEN IN THE 850 MB THETA-E EARLY TONIGHT ACROSS WESTERN MN. WEST CENTRAL MN IS THE AREA OF CONCERN THROUGH 25/06Z FOR A FEW SEVERE STORMS. SHEAR PARAMETERS COME TOGETHER AROUND 03Z ALONG WITH AMPLE CAPE. THE MID LEVEL WARM POCKET OF 15 DEG C OVER FAR EASTERN SD WILL ALSO SLOWLY PUSH EAST THIS EVENING WITH BETTER MID LEVEL LAPSE RATES DEVELOPING. THE OVERALL PRECIPITATION PATTERN TONIGHT LOOKS MUCH LIKE THE FORECAST FROM THE 24/00Z 4KM WRF-NMM. THEREFORE...CONTINUED THE TREND OF LIKELY POPS FOR WEST CENTRAL MN LATER THIS EVENING AND THEN SPREADING INTO THE TWIN CITIES AND SW AREAS AFTER MIDNIGHT. KEPT LIKELY POPS AS WELL TUESDAY MORNING TO THE EAST AND SOUTH OF THE TWIN CITIES AS THE FRONT WILL BE SLOW TO MOVE AS THE FLOW ALOFT BEGINS TO PARALLEL THE FRONT. AIDING THE PRECIPITATION CHANCES ARE SEVERAL SHORT WAVES RIDING NORTHWARD IN THE TROPICAL FLOW. THE GFS AND ECMWF ARE IN PRETTY GOOD AGREEMENT THAT THE FRONT WILL SINK SOUTH OF THE FA TUESDAY NIGHT AND WEDNESDAY WITH HIGH PRESSURE BUILDING IN FROM ONTARIO. THE NAM WAS AN OUTLIER AND APPEARED TOO FAR NORTH. KEPT THE FORECAST DRY ATTM BUT THIS WILL NEED TO BE WATCHED. AN STRONG UPPER LOW IS FORECAST TO DROP SOUTHEAST ACROSS THE UPPER MISSISSIPPI VALLEY FRIDAY AND SATURDAY AND THEN SIT OVER THE AREA ON SUNDAY. A VERY COOL PERIOD IS FORECAST. INDICATIONS FROM THE GFS AND ECMWF ARE FOR 850 MB TEMPERATURES TO BE NEAR 0 DEG C DURING PART OF THE WEEKEND. HAVE LOWERED HIGHS ON SATURDAY INTO THE MID TO UPPER 60S WITH MID 60S EAST TO AROUND 70 WEST ON SUNDAY. SHOWERS CHANCES IN PLACE ACROSS THE EASTERN AND SOUTHERN CWA ON SATURDAY. LOOKS LIKE A BRISK NORTH WIND MAY OCCUR AS WELL IF THIS SYSTEM MATURES AS FORECAST. RATHER CHILLY HIGH PRESSURE WILL FOLLOW TO BEGIN SEPTEMBER. && .MPX WATCHES/WARNINGS/ADVISORIES... MN...NONE. WI...NONE. && RAH/RAH
Hazardous weather outlook, Aug 25, 1:03 AM CDT, 1 hour 39 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 103 AM CDT TUE AUG 25 2009 MNZ041>045-047>070-073>078-082>085-091>093-WIZ014>016-023>028- 251000- 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- 103 AM CDT TUE AUG 25 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL AND SOUTHERN MINNESOTA...AND WEST CENTRAL WISCONSIN. .DAY ONE...TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TO EXPAND OVERNIGHT ACROSS PARTS OF CENTRAL AND SOUTH CENTRAL MINNESOTA...AND WEST CENTRAL WISCONSIN. THE GREATEST RISK OF STRONG THUNDERSTORMS WOULD BE OVER SOUTH CENTRAL MINNESOTA AHEAD OF THE APPROACHING COLD FRONT. SMALL HAIL...GUSTY WINDS AND LOCALIZED HEAVY RAINFALL ARE POSSIBLE WITH SOME OF THE STRONGER STORMS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY SCATTERED THUNDERSTORMS ARE EXPECTED TO BE ONGOING ON TUESDAY MORNING ACROSS SOUTH CENTRAL MINNESOTA AND PARTS OF WEST CENTRAL WISCONSIN. A FEW STRONGER STORMS WILL STILL BE POSSIBLE ACROSS FAR SOUTHERN MINNESOTA...WITH THE POSSIBILITY OF SMALL HAIL...GUSTY WINDS AND LOCALIZED HEAVY RAINFALL. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTER ACTIVATION WILL NOT BE NEEDED.
In the hours before
Special weather statement, Aug 25, 2:42 AM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
242 AM CDT TUE AUG 25 2009
MNZ074-075-082-083-091-092-250845-
BLUE EARTH-BROWN-FARIBAULT-MARTIN-NICOLLET-WATONWAN-
242 AM CDT TUE AUG 25 2009
AT 240 AM CDT...WEATHER SERVICE RADAR WAS TRACKING STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM ST JAMES TO 14 MILES SOUTH
OF CEYLON. THESE STORMS WERE MOVING NORTHEAST AT 40 MPH.
HAIL UP TO DIME SIZE AND WINDS UP TO 40 MPH ARE EXPECTED WITH THESE
STORMS.
* LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
ST JAMES.
LA SALLE.
WILBERT.
HANSKA.
NORTHROP.
GRANADA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THESE THUNDERSTORMS COULD INTENSIFY QUICKLY...SO BE READY TO ACT IF A
WARNING IS ISSUED.
&&
LAT...LON 4350 9476 4405 9471 4441 9400 4364 9403
4349 9428
TIME...MOT...LOC 0741Z 231DEG 35KT 4402 9461 4334 9467The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 2:58 AM CDT | Severe Thunderstorm Warning | MPX | Blue Earth, Brown, Martin, Nicollet, Sibley, Watonwan | 47 min |
| Aug 25, 3:32 AM CDT | Special Weather Statement | MPX | Swift | 58 min |
| Aug 25, 3:46 AM CDT | Special Weather Statement | MPX | Dakota, Faribault, Le Sueur, Rice, Steele, Waseca | 59 min |
| Aug 25, 5:44 AM CDT | Areal Flood Advisory | MPX | Dakota, Goodhue | 3 hr |
| Aug 25, 4:41 AM CDT | Special Weather Statement | MPX | Pierce | 64 min |
| Aug 25, 6:19 AM CDT | Special Weather Statement | MPX | Barron | 41 min |
| Aug 25, 7:15 AM CDT | Areal Flood Advisory | MPX | Barron, Polk | 4 hr |
Nearby
Special Weather Statements in Minnesota, 2009Every special weather statement in 2009
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.