Severe Thunderstorm Warning 275, NWS Twin Cities, MN

Issued

Aug 12, 2002, 2:14 AM CDT (07:14 UTC)

Expired

Aug 12, 2002, 2:45 AM CDT

In force

31 min

Issued by

NWS Twin Cities, MN

Area

Counties, with a storm outline in the text

County Ramsey County, MN

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

952 
WUUS53 KMPX 120714
SVRMSP
MNC123-120745-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
214 AM CDT MON AUG 12 2002

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  RAMSEY COUNTY IN EAST CENTRAL MINNESOTA

* UNTIL 245 AM CDT

* AT 213 AM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE
  HAIL OVER SOUTHERN NEW BRIGHTON...OR ABOUT 15 MILES NORTHWEST OF
  DOWNTOWN ST PAUL. THE STORM WAS MOVING NORTHEAST AT 25 MPH.

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  MAPLEWOOD.
  ROSEVILLE.
  NEW BRIGHTON.
  SHOREVIEW.
  ARDEN HILLS.

THIS IS A DANGEROUS STORM...STAY INDOORS AWAY FROM WINDOWS. SEVERE
THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

LAT...LON 4512 9321 4498 9320 4497 9299 4513 9301

NWS Twin Cities, MN wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 11, 9:05 PM CDT, 5 hours 9 minutes earlier.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
905 PM CDT SUN AUG 11 2002

RADAR AND SATELLITE TRENDS INDICATED THAT THE CONVECTION OVER THE
EASTERN DAKOTAS AND NORTHWEST MINNESOTA IS STAYING CLOSE TO THE 850
MB THETA E RIDGE. EXPECT THIS WILL REMAIN THE CASE OVERNIGHT BASED
ON THE FORECAST THICKNESS PATTERN. THE FORECAST THICKNESS SIGNATURE
CONTINUES TO FEATURE A FAIRLY SHARP RIDGE WITH DIFLUENCE RIGHT ALONG
THE AXIS. THE MESO ETA MODEL PROJECTS THIS AXIS FROM MILLE LACS
LAKE TO ST CLOUD TO LITCHFIELD TO MORTON AT 4 AM...THEN FROM NEW
RICHMOND...WI TO FARIBAULT TO BLUE EARTH AT 7 AM. CURRENT TRENDS
ALSO SUGGEST THE CONVECTION IS SEPARATING INTO TWO AREAS...ONE IN
SOUTH DAKOTA AND THE OTHER IN NORTHWEST MINNESOTA. THE AREA IN
EASTERN SOUTH DAKOTA IS THE CONCERN FOR OUR COUNTY WARNING AREA
OVERNIGHT INTO MONDAY MORNING. THIS AREA APPEARS CORRELATED WITH THE
RIGHT ENTRANCE REGION OF THE UPPER LEVEL JET. SUSTAINED LIFT WITH
THIS ENTRANCE REGION IS FORECAST WITH THE APPROACHING COLD FRONT.
THIS LIFT MAY EVEN BE ENHANCED WITH THE MODELS SUGGESTING AN
INCREASING 850 MB SOUTHERLY JET...AROUND 40 KNOTS...OVERNIGHT. THIS
SCENARIO SOMETIMES FAVORS ELEVATED NOCTURNAL LIFT AND VERY HEAVY
RAINFALL. AT THIS TIME...CONTINUING TO MONITOR THE SOUTH DAKOTA
CONVECTION FOR POSSIBLE SURGE IN THE LINE AND POTENTIAL FOR DAMAGING
WINDS OR HAIL.

.MSP...NONE.
 WH

In the hours before

MNZ041-042-048-054>057-064-065-073-120703-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
148 AM CDT MON AUG 12 2002

THE SEVERE THUNDERSTORM WATCH FOR A PORTION OF WEST CENTRAL AND
SOUTHWEST MINNESOTA HAS BEEN CANCELLED. THE COUNTIES REMOVED FROM
THE SEVERE THUNDERSTORM WATCH ARE DOUGLAS...TODD...STEVENS...POPE...
SWIFT...LAC QUI PARLE...CHIPPEWA...KANDIYOHI...RENVILLE AND REDWOOD.

Severe Thunderstorm Warnings in Minnesota, 2002Every severe thunderstorm warning in 2002

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.