Alert archive / Minnesota / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 72, NWS Twin Cities, MN

August 2, 20094 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 2, 2009, 11:10 PM CDT for 4 counties in Minnesota. It was in force for 40 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 2, 2009, 11:10 PM CDT (04:10 UTC)
Expired
Aug 2, 2009, 11:50 PM CDT
In force
40 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon

Counties Carver County, MN, Dakota County, MN, Hennepin County, MN, Scott County, MN

The radar

The Minneapolis radar (KMPX), 7 km from the middle of the area, began a volume at 04:11 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.

What was reported inside it

TimeReportWhereRemark
Aug 2, 11:13 PM CDTTSTM WND DMG2 Sw Excelsior, MNTREE DOWN JUST EAST OF COUNTY ROAD 19 AND TONKA BAY ROAD.
Aug 2, 11:15 PM CDTTSTM WND DMG3 Ssw Excelsior, MNTREE DOWN AT COUNTY ROAD 19 AND MINNETONKA DRIVE.
Aug 2, 11:15 PM CDTHAIL 0.753 Ssw Excelsior, MN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 2, 8:41 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 4.2 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-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2009-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1619 joules per kilogram.LCLLFCEL10008507005003002001001 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 2009-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 255 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
1619 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
1198 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
255 m²/s²
0-3 km storm-relative helicity
395 m²/s²
Significant tornado parameter
2.1
Supercell composite
10.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS53 KMPX 030410
SVRMPX
MNC019-037-053-139-030515-
/O.NEW.KMPX.SV.W.0072.090803T0410Z-090803T0515Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1110 PM CDT SUN AUG 2 2009

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA...
  EASTERN CARVER COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHWESTERN DAKOTA COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHERN SCOTT COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 1215 AM CDT

* AT 1109 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 65 MPH.
  THIS STORM WAS LOCATED 5 MILES SOUTH OF ST BONIFACIUS...OR ABOUT 25
  MILES WEST OF MINNEAPOLIS...AND MOVING EAST AT 30 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  MINNEAPOLIS...
  ST BONIFACIUS...
  MINNETRISTA...
  CARVER...
  MOUND...
  CHASKA...
  MARYSTOWN...
  ORONO...
  SHOREWOOD...
  CHANHASSEN...
  EXCELSIOR...
  SHAKOPEE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS AND LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

REPORT ANY SIGNIFICANT WIND OR HAIL DAMAGE TO THE NEAREST LAW
ENFORCEMENT AGENCY...FOR RELAY TO THE NATIONAL WEATHER SERVICE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM CDT MONDAY
MORNING FOR SOUTHERN MINNESOTA.

&&

LAT...LON 4470 9367 4489 9365 4489 9377 4494 9377
      4501 9350 4504 9321 4491 9320 4489 9318
      4468 9314
TIME...MOT...LOC 0410Z 253DEG 25KT 4483 9373

$$
2 follow-up statements
000 
WWUS53 KMPX 030433
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1133 PM CDT SUN AUG 2 2009

MNC019-030443-
/O.CAN.KMPX.SV.W.0072.000000T0000Z-090803T0515Z/
CARVER MN-
1133 PM CDT SUN AUG 2 2009

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN CARVER COUNTY IS
CANCELLED...

RADAR INDICATED THAT THE SEVERE STORM HAD WEAKENED OR MOVED OUT OF
THE WARNED AREA. THEREFORE...THE SEVERE THUNDERSTORM WARNING HAS BEEN
CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM CDT MONDAY
MORNING FOR SOUTHERN MINNESOTA.

LAT...LON 4470 9364 4474 9363 4476 9361 4480 9357
      4481 9352 4489 9353 4496 9351 4501 9323
      4489 9318 4468 9314
TIME...MOT...LOC 0433Z 253DEG 25KT 4488 9351

$$

MNC037-053-139-030515-
/O.CON.KMPX.SV.W.0072.000000T0000Z-090803T0515Z/
HENNEPIN MN-DAKOTA MN-SCOTT MN-
1133 PM CDT SUN AUG 2 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT 
FOR NORTHERN SCOTT...NORTHWESTERN DAKOTA AND SOUTHERN HENNEPIN 
COUNTIES...

AT 1129 PM CDT...RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM...
CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THE SEVERE
STORM WAS LOCATED 4 MILES SOUTHWEST OF MINNETONKA...OR ABOUT OVER
CHANHASSEN...AND MOVING EAST AT 30 MPH.

LOCATIONS IN THE WARNING INCLUDE...
MINNEAPOLIS...PRIOR LAKE...MINNETONKA...WOODLAND...EDEN PRAIRIE...THE
LAKE MINNETONKA AREA...SAVAGE...HOPKINS...EDINA...BLOOMINGTON...ST
LOUIS PARK AND BURNSVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS.

REPORT ANY DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY...FOR RELAY
TO THE NATIONAL WEATHER SERVICE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM CDT MONDAY
MORNING FOR SOUTHERN MINNESOTA.

&&

LAT...LON 4470 9364 4474 9363 4476 9361 4480 9357
      4481 9352 4489 9353 4496 9351 4501 9323
      4489 9318 4468 9314
TIME...MOT...LOC 0433Z 253DEG 25KT 4488 9351

$$
000 
WWUS53 KMPX 030450
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1150 PM CDT SUN AUG 2 2009

MNC037-053-139-030459-
/O.CAN.KMPX.SV.W.0072.000000T0000Z-090803T0515Z/
HENNEPIN MN-DAKOTA MN-SCOTT MN-
1150 PM CDT SUN AUG 2 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SCOTT...
NORTHWESTERN DAKOTA AND SOUTHEASTERN HENNEPIN COUNTIES IS
CANCELLED...

RADAR INDICATED THAT THE SEVERE STORM HAD WEAKENED AND MOVED OUT OF 
THE WARNED AREA. THEREFORE...THE SEVERE THUNDERSTORM WARNING HAS 
BEEN CANCELLED. HOWEVER...A SEVERE THUNDERSTORM WARNING DOES REMAIN 
IN EFFECT FOR THE REMAINDER OF DAKOTA COUNTY UNTIL 1115 PM CDT.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM CDT MONDAY
MORNING FOR SOUTHERN MINNESOTA.

LAT...LON 4470 9364 4474 9363 4476 9361 4480 9357
      4481 9352 4489 9353 4496 9351 4501 9323
      4489 9318 4468 9314
TIME...MOT...LOC 0449Z 253DEG 25KT 4491 9336

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 8:45 PM CDTSevere Thunderstorm WarningMPXRedwood, Yellow Medicine45 min
Aug 2, 9:24 PM CDTSevere Thunderstorm WarningMPXRedwood, Renville, Yellow Medicine51 min
Aug 2, 9:40 PM CDTSevere Thunderstorm WarningMPXRenville49 min
Aug 2, 9:45 PM CDTTornado WarningMPXRedwood29 min
Aug 2, 9:55 PM CDTSevere Thunderstorm WarningMPXBrown, Redwood50 min
Aug 2, 10:06 PM CDTSevere Thunderstorm WarningMPXMcLeod, Sibley54 min
Aug 2, 10:20 PM CDTSevere Thunderstorm WarningMPXWatonwan39 min
Aug 2, 10:37 PM CDTSpecial Weather StatementMPXDakota, Hennepin, Ramsey, Scott68 min
Aug 2, 10:39 PM CDTSevere Thunderstorm WarningMPXCarver52 min
Aug 2, 10:43 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Brown47 min
Aug 2, 10:56 PM CDTSevere Thunderstorm WarningMPXMcLeod, Scott, Sibley49 min
Aug 2, 11:18 PM CDTSevere Thunderstorm WarningMPXDakota47 min
Aug 2, 11:29 PM CDTSpecial Weather StatementMPXSteele, Waseca46 min
Aug 2, 11:45 PM CDTSevere Thunderstorm WarningMPXLe Sueur, Rice, Scott20 min
Aug 2, 11:48 PM CDTSevere Thunderstorm WarningMPXGoodhue, Washington57 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2009Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.