Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 312, NWS Twin Cities, MN

August 13, 2007Hennepin County, Ramsey County, Washington County, Minnesota; Polk County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 13, 2007, 9:15 PM CDT for Hennepin County, Ramsey County, Washington County, Minnesota; Polk County, Saint Croix County, Wisconsin. It was in force for 60 min. 20 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 13, 2007, 9:15 PM CDT (02:15 UTC)
Expired
Aug 13, 2007, 10:15 PM CDT
In force
60 min
Issued by
NWS Twin Cities, MN
Area
Counties, with a storm outline in the text

Counties Hennepin County, MN, Ramsey County, MN, Washington County, MN, Polk County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 71 km from the middle of the area, began a volume at 02:16 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 13, 9:42 PM CDTTSTM WND DMGNew Richmond, WIESTIMATED 50-60 MPH WINDS. LAWN FURNITURE THROWN.
Aug 13, 9:43 PM CDTTSTM WND DMGNew Richmond, WIAPPROXIMATED 6 INCH DIAMETER TREES DOWN. AIRPORT HANGER ROOF PEELED OFF. REPORTED BY AIRPORT OPERATOR.
Aug 13, 9:43 PM CDTTSTM WND GST 69New Richmond, WI1/2 INCH HAIL REPORTED.
Aug 13, 9:45 PM CDTTSTM WND DMG3 Ese New Richmond, WIHOUSE DESTROYED.TIME ESTIMATED.
Aug 13, 9:45 PM CDTTSTM WND DMGNew Richmond, WI5 INCH DIAMETER TREE LIMBS DOWN.
Aug 13, 9:45 PM CDTHAIL 1.5Vadnais Heights, MNNEAR COUNTY RD. F AND I-35E.
Aug 13, 9:45 PM CDTHAIL 1.5White Bear Lake, MN
Aug 13, 9:45 PM CDTHAIL 2.52 Sw White Bear Lake, MNNEA HWY 96.
Aug 13, 9:46 PM CDTHAIL 0.88White Bear Lake, MN
Aug 13, 9:48 PM CDTHAIL 1Vadnais Heights, MN
Aug 13, 9:49 PM CDTHAIL 1Maplewood, MN
Aug 13, 9:49 PM CDTHAIL 1.75Mahtomedi, MN
Aug 13, 9:50 PM CDTHAIL 1.75White Bear Lake, MN
Aug 13, 9:51 PM CDTHAIL 1.75Mahtomedi, MN
Aug 13, 9:55 PM CDTHAIL 0.75Hammond, WIMEASURED 47 MPH WINDS AT 940PM.
Aug 13, 9:55 PM CDTHAIL 1.25White Bear Lake, MNNEAR COUNTY RD. F. AND HWY. 120.
Aug 13, 9:58 PM CDTHAIL 0.88Stillwater, MNESTIMATED WIND SPEEDS OF 60 MPH AT 945PM.
Aug 13, 10:00 PM CDTTSTM WND DMG6 W Glenwood City, WILOTS OF LARGE TREES 6 INCHES TO 2 FT DIAMETER DOWN. OBSERVED AT DAWN.
Aug 13, 10:00 PM CDTTSTM WND DMGEmerald, WISTRUCTURAL WIND DAMAGE HOUSES DOWN AND BLOWN OVER. 4 TO 5 BARNS DAMAGED
Aug 13, 10:05 PM CDTTSTM WND DMGStar Prairie, WIROOF MISSING. TREES DOWN.

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 13, 6:59 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.3 hours before the alert went out and 73 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 2007-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2096 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 2007-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 263 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
2096 J/kg
Mixed-layer CIN
-245 J/kg
Mixed-layer LCL
1133 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
263 m²/s²
0-3 km storm-relative helicity
409 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.0

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 140215
SVRMPX
MNC053-123-163-WIC095-109-140315-
/O.NEW.KMPX.SV.W.0312.070814T0215Z-070814T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
915 PM CDT MON AUG 13 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WASHINGTON COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHEAST HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA...
  RAMSEY COUNTY IN EAST CENTRAL MINNESOTA...
  POLK COUNTY IN NORTHWEST WISCONSIN...
  ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 1015 PM CDT

* AT 912 PM CDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS...CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 65 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM 7 MILES WEST OF LUCK TO 12 MILES
  SOUTHWEST OF ST CROIX FALLS TO 7 MILES NORTHWEST OF BROOKLYN
  PARK...AND MOVING EAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ST CROIX FALLS...
  BROOKLYN PARK...
  LUCK...
  BALSAM LAKE...
  ROSEVILLE...
  VADNAIS HEIGHTS...
  AMERY...
  WHITE BEAR LAKE...
  MAPLEWOOD...
  SOMERSET...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM CDT
TUESDAY MORNING FOR SOUTHERN MINNESOTA.

LAT...LON 4565 9264 4529 9268 4527 9297 4510 9308
      4501 9323 4514 9334 4521 9360 4497 9322
      4491 9287 4487 9223 4524 9217 4559 9220

$$
1 follow-up statement
000 
WWUS53 KMPX 140252
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
948 PM CDT MON AUG 13 2007

MNC053-140258-
/O.CAN.KMPX.SV.W.0312.000000T0000Z-070814T0315Z/
HENNEPIN MN-
948 PM CDT MON AUG 13 2007

...THE SEVERE THUNDERSTORM WARNING FOR HENNEPIN COUNTY IS
CANCELLED...

SEVERE THUNDERSTORMS HAVE MOVED OUT OF FAR EASTERN HENNEPIN COUNTY.
ADDITIONAL STRONG THUNDERSTORMS ARE APPROACHING FROM THE WEST.
CITIZENS ARE URGED NOT TO LET DOWN THEIR GUARD.

LAT...LON 4565 9264 4529 9268 4527 9297 4510 9308
      4498 9319 4491 9287 4487 9223 4524 9217
      4559 9220

$$

MNC123-163-WIC095-109-140315-
/O.CON.KMPX.SV.W.0312.000000T0000Z-070814T0315Z/
WASHINGTON MN-RAMSEY MN-POLK WI-ST. CROIX WI-
948 PM CDT MON AUG 13 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR ST. CROIX...POLK...RAMSEY AND WASHINGTON COUNTIES...

AT 944 PM CDT...69 MPH WINDS WERE REPORTED BY THE AIRPORT MANAGER
IN NEW RICHMOND. AT 939 PM GOLFBALL SIZE HAIL WAS REPORTED BY 
A SPOTTER IN TEH CITY OF SHOREVIEW. THESE CONTINUE TO BE 
DANGEROUS STORMS...SEEK SAFE SHELTER AND STAY AWAY FROM WINDOWS

AT 945 PM CDT...THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM 4 MILES NORTHEAST OF RANGE TO 5 MILES EAST OF HOULTON TO
MAPLEWOOD...AND MOVING SOUTHEAST AT 40 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE WANDEROOS...RANGE...NORTH
HUDSON...LITTLE FALLS...HUNTINGTON...HOULTON...HERSEY...FOREST
AND EMERALD.

CITIZENS ARE URGED TO SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS

LAT...LON 4565 9264 4529 9268 4527 9297 4510 9308
      4498 9319 4491 9287 4487 9223 4524 9217
      4559 9220

$$

JPR

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 7:44 PM CDTSevere Thunderstorm WarningMPXBenton, Mille Lacs61 min
Aug 13, 7:57 PM CDTSevere Thunderstorm WarningMPXMorrison18 min
Aug 13, 8:08 PM CDTSevere Thunderstorm WarningMPXKanabec52 min
Aug 13, 8:17 PM CDTSevere Thunderstorm WarningMPXIsanti, Sherburne58 min
Aug 13, 8:43 PM CDTSevere Thunderstorm WarningMPXAnoka, Chisago62 min
Aug 13, 8:47 PM CDTSevere Thunderstorm WarningMPXStearns, Todd58 min
Aug 13, 8:52 PM CDTTornado WarningMPXAnoka, Sherburne23 min
Aug 13, 9:45 PM CDTSevere Thunderstorm WarningMPXMeeker, Stearns, Wright60 min
Aug 13, 10:42 PM CDTSevere Thunderstorm WarningMPXHennepin, Wright63 min
Aug 13, 10:46 PM CDTFlash Flood WarningMPXHennepin119 min
Aug 13, 11:30 PM CDTSevere Thunderstorm WarningMPXWashington60 min
Aug 13, 11:37 PM CDTSevere Thunderstorm WarningMPXDakota, Goodhue53 min
Aug 13, 11:48 PM CDTFlash Flood WarningMPXDakota, Scott117 min
Aug 13, 11:51 PM CDTSevere Thunderstorm WarningMPXScott29 min
Aug 14, 12:26 AM CDTFlash Flood WarningMPXGoodhue2 hr
Aug 14, 12:29 AM CDTSevere Thunderstorm WarningMPXGoodhue48 min
Aug 13, 10:00 PM CDTSevere Thunderstorm WarningMPXDunn, Pepin, Pierce60 min
Aug 13, 10:15 PM CDTSevere Thunderstorm WarningMPXSaint Croix30 min
Aug 13, 10:21 PM CDTSevere Thunderstorm WarningMPXChippewa, Eau Claire54 min
Aug 13, 11:10 PM CDTSevere Thunderstorm WarningMPXEau Claire31 min
Aug 14, 12:05 AM CDTSevere Thunderstorm WarningMPXDunn, Pepin55 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2007Severe Thunderstorm Warnings in Wisconsin, 2007Every severe thunderstorm warning in 2007

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.