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 Jul 31, 2009, 6:27 PM CDT for 6 counties in Minnesota. It was in force for 48 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
- Jul 31, 2009, 6:27 PM CDT (23:27 UTC)
- Expired
- Jul 31, 2009, 7:15 PM CDT
- In force
- 48 min
- Issued by
- NWS Twin Cities, MN
Counties Chippewa County, MN, Douglas County, MN, Lac qui Parle County, MN, Pope County, MN, Swift County, MN, Yellow Medicine County, MN
The radar
The Aberdeen radar (KABR), 189 km from the middle of the area, began a volume at 23:28 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
Aberdeen, SD (KABR), launched 12:00Z, 11.5 hours before the alert went out and 195 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
- 2 J/kg
- Mixed-layer CIN
- -101 J/kg
- Mixed-layer LCL
- 1565 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 141 m²/s²
- 0-3 km storm-relative helicity
- 167 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jul 31, 2:48 PM CDT, 3 hours 39 minutes earlier.
Area forecast discussion, Jul 31, 2:48 PM CDT, 3 hours 39 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 248 PM CDT FRI JUL 31 2009 .DISCUSSION... THE LATEST EUROPEAN...GFS AND CANADIAN MODEL OUTPUTS ALL INDICATE PRECIP DEVELOPING OVER THE FORECAST AREA OVERNIGHT AND LINGERING OVER THE EASTERN HALF OF THE FORECAST AREA THROUGH NOON SATURDAY. SHORTWAVE TROUGH AND FRONTAL BOUNDARY MOVING OVER THE UPPER MIDWEST TONIGHT...THEN FOLLOWED BY COOL NORTHWEST AIRFLOW ALOFT OVER THE MIDWEST OVER THE NEXT SEVERAL DAYS. CURRENT COMPOSITE RADAR IMAGE SHOWED AN AREA OF SHOWERS AND ISOLATED THUNDERSTORMS OVER THE DAKOTAS INTO EXTREME NORTHWEST MN. INDIVIDUAL SHOWERS AND STORMS WERE MOVING NORTHEAST...WHILE OVERALL AREA WAS MOVING EAST AT ABOUT 25 MPH. SURFACE HIGH PRES RIDGE OVER THE MIDWEST INTO THE GREAT LAKES...WILL HOLD OFF THE PRECIP FROM SPREADING TO FAR INTO WEST CENTRAL WI AND SOUTH CENTRAL MN THIS EVENING. AIRMASS AHEAD OF THE FRONT SHOULD CONTINUE TO SATURATE AS LOW LEVEL MOISTURE STREAM NORTHWARD. DEWPOINTS HAD RISEN IN THE UPPER 50S AND LOWER 60S OVER PARTS OF WESTERN MINNESOTA. KEPT SOME SMALL POPS OF SHRA/TSRA OVER PORTION OF OUR NORTHERN AND EASTERN CWA SATURDAY EVENING...WITH MARGINAL INSTABILITY...MOISTURE IN THE WAKE OF THE UPPER LOW OVER THE GREAT LAKES. WEAK FRONTAL BOUNDARY EXPECTED TO PUSH BACK OVER THE FORECAST AREA ON MONDAY. BEST UPPER DYNAMICS AND INSTABLITY STAYS WELL SOUTH OF OUR CWA. THE MEDIUM AND LONG RANGE MODELS CONTINUE TO INDICATES NO MAJOR CHANGES TO THE OVERALL WEATHER PATTERN. && .AVIATION.../18Z TAF ISSUANCE/ NO AVIATION PROBLEMS FOR THE NEXT 6 HRS WITH VFR CEILINGS/VSBY WITH MOST OF THE ACTIVE WEATHER REMAINING WEST OF MPX TAFS. EXCEPT A SLOW LOWERING OF THE CEILINGS THROUGH THE AFTN ACROSS AXN/RWF...WITH CBS POSSIBLE AFT 22/23Z FOR AXN/RWF AREA. HOWEVER...DO NOT EXPECT -SHRA/TSRA UNTIL AFT 00/01Z FOR FAR WESTERN MN. MOST OF THE CHANGES WILL OCCUR DURING THE 00/06Z TIME PERIOD WITH SHRA/TSRA DEVELOPING ACROSS RWF/AXN AREAS...THEN SPREADING EASTWARD. MVFR CEILINGS WILL LIKELY DEVELOP AFTER 04/05Z IN THE WEST...THEN SLOWLY SPREADING EASTWARD. WINDS WILL INITIALLY BE S/SW AT 8/13 KTS...THEN BECOME W/NW BETWEEN 06/12Z...THEN GUSTY AFTER 14Z. LOWER CEILINGS OF IFR/OR LOW END MVFR REMAINS A PROBLEM FOR MOST TAFS BETWEEN 06/15Z TONIGHT/MORNING HRS. TOO MANY UNCERTAINTIES RELATED TO THE AMOUNT OF -SHRA ACTIVITY OVERNIGHT...AND THE AMOUNT OF SATURATION IN THE LOWER LEVELS OF THE ATMOSPHERE. HOWEVER...HAVE CONTINUED THE TREND OF AT LEAST SCATTERED CLOUDS OF 800/1200...WITH SLOWLY LIFTING CEILINGS AFT 16Z. ..JLT.. CWSU DISCUSSION. LATEST HPC ANALYSIS SHOWING A LOW N OF W CNTL ND WITH A CLD FNT EXTNDG THRU NW ZMP INTO MT, AND RDGG OVR ERN ZMP. THRU THE FCST PERIOD THE FNT IS EXPCTD TO DRIVE S THEN E THRU ZMP AND INTO THE LOCAL AREA OVRNGT. BY THE END OF TAF FNT WILL HAVE OCLDD AND WILL BE IN THE CNTL GRT LKS RGN. LOOKING AT THE LATEST MDL RUNS, MUCH OF THE PREVIOUS TAF STILL LOOKS VALID. I WOULD DROP THE LOW CIGS POST FROPA DOWN TO 015 RATHER THAN 025 AT 09Z, AND AFT 16Z I WOULD SCT THINGS OUT. BY 21Z THE SCT DECK SHOULD RISE AS HIGH AS 040. PTCHY GROUND FOG WILL LIKELY BE AN ISSUE AS ABS HUM AS EXPCTD TO BE SLIGHTLY HIGHER THAN THEY WERE LAST NIGHT. WNDS WILL START SW, BECOME S BY 02Z, GO BACK TO SW BY 05Z, BECOME W BY 10Z, AND FINALLY WNW BY 15Z. SPDS WILL START NR 11KTS, DROP TO 6 KTS OVRNGT, THEN RISE BACK UP TO 15G21KT TOMORROW AFTN. ..PDP.. && .MPX WATCHES/WARNINGS/ADVISORIES... MN...NONE. WI...NONE. && JVM/JLT
Hazardous weather outlook, Jul 31, 5:36 PM CDT, 51 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 536 PM CDT FRI JUL 31 2009 MNZ041>045-047>070-073>078-082>085-091>093-WIZ014>016-023>028- 011200- 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- 536 PM CDT FRI JUL 31 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL AND SOUTHERN MINNESOTA...AND WEST CENTRAL WISCONSIN. .DAY ONE...TONIGHT A STRONG COLD FRONT WILL MOVE ACROSS MINNESOTA INTO WESTERN WISCONSIN DURING THE NIGHT. AN AREA OF THUNDERSTORMS WILL ACCOMPANY THE FRONT AS IT MOVES EAST. SOME OF THE STORMS COULD BE SEVERE...WITH LARGE HAIL AND DAMAGING WINDS...ESPECIALLY OVER WEST CENTRAL AND POSSIBLY INTO CENTRAL MINNESOTA THIS EVENING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THE COOL FRONT WILL EXIT THE EASTERN PORTION OF THE OUTLOOK AREA BY EARLY SATURDAY MORNING. A FEW THUNDERSTORMS MAY LINGER LATE SATURDAY MORNING ACROSS WEST CENTRAL WISCONSIN. THUNDERSTORMS ARE ALSO POSSIBLE IN PORTIONS OF THE OUTLOOK AREA SUNDAY AND SUNDAY NIGHT WITH ANOTHER COOL FRONT. AT THIS TIME...THE THREAT FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTER ACTIVATION MAY BE NEEDED OVER WEST CENTRAL MINNESOTA THIS EVENING.
In the hours before
Local storm report, Jul 31, 6:18 PM CDT, 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
618 PM CDT FRI JUL 31 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0608 PM HAIL 6 NNE CHOKIO 45.66N 96.15W
07/31/2009 E0.75 INCH STEVENS MN TRAINED SPOTTER
&&
MTFSpecial weather statement, Jul 31, 6:27 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
627 PM CDT FRI JUL 31 2009
MNZ041-047-048-054>056-064-065-010015-
CHIPPEWA-DOUGLAS-LAC QUI PARLE-POPE-RENVILLE-STEVENS-SWIFT-YELLOW
MEDICINE-
627 PM CDT FRI JUL 31 2009
...STRONG THUNDERSTORMS MOVING ACROSS CHIPPEWA...DOUGLAS...LAC QUI
PARLE...POPE...STEVENS...SWIFT AND YELLOW MEDICINE COUNTIES THROUGH
715 PM CDT...
AT 622 PM CDT...WEATHER SERVICE RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORM NEAR MORRIS...APPLETON AND MADISON. THE STORMS WERE
MOVING TO THE EAST AT 40 MPH.
HAIL UP TO DIME SIZE AND WINDS UP TO 50 MPH ARE EXPECTED WITH THIS
LINE OF STORMS AS IT MOVES THROUGH.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEEK SHELTER AND STAY AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
&&
LAT...LON 4525 9642 4526 9632 4520 9612 4539 9614
4542 9573 4611 9572 4611 9518 4465 9548
4465 9643
TIME...MOT...LOC 2325Z 275DEG 33KT 4517 9613The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 5:55 PM CDT | Severe Thunderstorm Warning | MPX | Stevens | 65 min |
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.