Alert archive / Minnesota / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 67, NWS Twin Cities, MN

August 2, 2009McLeod County, Sibley County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 2, 2009, 10:06 PM CDT for McLeod County, Sibley County, Minnesota. It was in force for 54 min. 4 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, 10:06 PM CDT (03:06 UTC)
Expired: Aug 2, 2009, 11:00 PM CDT
In force: 54 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon

Counties McLeod County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 57 km from the middle of the area, began a volume at 03:07 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

Time	Report	Where
Aug 2, 10:23 PM CDT	HAIL 0.75	Hutchinson, MN
Aug 2, 10:27 PM CDT	HAIL 1	5 S Hutchinson, MN
Aug 2, 10:36 PM CDT	HAIL 1	E Stewart, MN
Aug 2, 10:54 PM CDT	HAIL 1.75	5 N Brownton, 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.

Issued	Product	Office	Lasted
Aug 2, 8:41 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.1 hours before the alert went out and 55 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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 030306
SVRMPX
MNC085-143-030400-
/O.NEW.KMPX.SV.W.0067.090803T0306Z-090803T0400Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1006 PM CDT SUN AUG 2 2009

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MCLEOD COUNTY IN CENTRAL MINNESOTA...
  SIBLEY COUNTY IN CENTRAL MINNESOTA...

* UNTIL 1100 PM CDT

* AT 1005 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND DAMAGING
  WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 13 MILES
  NORTHWEST OF STEWART...OR ABOUT 14 MILES WEST OF                   
  HUTCHINSON...AND MOVING EAST AT 25 MPH.  ANOTHER STORM WAS         
  LOCATED 2 MILES WEST OF HECTOR...ALSO MOVING EAST AT 25 MPH.   

LOCATIONS IN THE WARNING INCLUDE...
  HUTCHINSON...
  STEWART...
  BROWNTON...
  BISCAY...
  WINTHROP...
  SILVER LAKE...
  GLENCOE...
  NEW AUBURN...
  PLATO...
  LESTER PRAIRIE...
  GREEN ISLE...
  ARLINGTON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS
ARE ALSO EXPECTED...WHICH WILL UPROOT TREES AND DOWN POWER LINES.
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 4456 9463 4471 9464 4472 9450 4490 9450
      4492 9402 4479 9400 4479 9402 4472 9402
      4471 9400 4450 9398
TIME...MOT...LOC 0306Z 284DEG 21KT 4487 9466

$$

2 follow-up statements

000 
WWUS53 KMPX 030317
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1017 PM CDT SUN AUG 2 2009

MNC085-143-030400-
/O.CON.KMPX.SV.W.0067.000000T0000Z-090803T0400Z/
MCLEOD MN-SIBLEY MN-
1017 PM CDT SUN AUG 2 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT
FOR SIBLEY AND MCLEOD COUNTIES...

MULTIPLE REPORTS OF GOLFBALL SIZE HAIL HAVE BEEN REPORTED AROUND THE 
HECTOR AREA. 

AT 1016 PM CDT...RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM...
CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP TO BASEBALL SIZE AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THE SEVERE STORM WAS LOCATED 10
MILES NORTHWEST OF STEWART...OR ABOUT 2 MILES NORTHWEST OF
LAKESIDE...AND MOVING EAST AT 25 MPH.

LOCATIONS IN THE WARNING INCLUDE...
HUTCHINSON...STEWART...BROWNTON...BISCAY...WINTHROP...SILVER LAKE...
GLENCOE...NEW AUBURN...PLATO...LESTER PRAIRIE...GREEN ISLE AND
ARLINGTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS
ARE ALSO EXPECTED...WHICH CAN UPROOT TREES AND DOWN POWER LINES. 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 4456 9463 4471 9464 4472 9450 4490 9450
      4492 9402 4479 9400 4479 9402 4472 9402
      4471 9400 4450 9398
TIME...MOT...LOC 0317Z 284DEG 21KT 4485 9458

$$

000 
WWUS53 KMPX 030331
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1031 PM CDT SUN AUG 2 2009

MNC085-143-030400-
/O.CON.KMPX.SV.W.0067.000000T0000Z-090803T0400Z/
MCLEOD MN-SIBLEY MN-
1031 PM CDT SUN AUG 2 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT
FOR CENTRAL SIBLEY AND MCLEOD COUNTIES...

AT 1031 PM CDT...RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM...
CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP TO BASEBALL SIZE AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THE SEVERE STORM WAS LOCATED 6 
MILES NORTHEAST OF STEWART...AND MOVING EAST AT 20 MPH...ALONG THE 
HIGHWAY 212 CORRIDOR.

LOCATIONS IN THE WARNING INCLUDE...
HUTCHINSON...BROWNTON...BISCAY...SILVER LAKE...GLENCOE...NEW
AUBURN...PLATO...GREEN ISLE...ARLINGTON...LESTER PRAIRIE...GAYLORD
AND FERNANDO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS
ARE ALSO EXPECTED...WHICH CAN UPROOT TREES AND DOWN POWER LINES. 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 4458 9449 4472 9450 4490 9450 4492 9402
      4479 9400 4479 9402 4472 9402 4471 9400
      4450 9398
TIME...MOT...LOC 0331Z 289DEG 18KT 4480 9443

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 8:45 PM CDT	Severe Thunderstorm Warning	MPX	Redwood, Yellow Medicine	45 min
Aug 2, 9:24 PM CDT	Severe Thunderstorm Warning	MPX	Redwood, Renville, Yellow Medicine	51 min
Aug 2, 9:40 PM CDT	Severe Thunderstorm Warning	MPX	Renville	49 min
Aug 2, 9:45 PM CDT	Tornado Warning	MPX	Redwood	29 min
Aug 2, 9:55 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Redwood	50 min
Aug 2, 10:20 PM CDT	Severe Thunderstorm Warning	MPX	Watonwan	39 min
Aug 2, 10:37 PM CDT	Special Weather Statement	MPX	Dakota, Hennepin, Ramsey, Scott	68 min
Aug 2, 10:39 PM CDT	Severe Thunderstorm Warning	MPX	Carver	52 min
Aug 2, 10:43 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown	47 min
Aug 2, 10:56 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Scott, Sibley	49 min
Aug 2, 11:10 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Dakota, Hennepin, Scott	40 min
Aug 2, 11:18 PM CDT	Severe Thunderstorm Warning	MPX	Dakota	47 min
Aug 2, 11:29 PM CDT	Special Weather Statement	MPX	Steele, Waseca	46 min
Aug 2, 11:45 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Rice, Scott	20 min
Aug 2, 11:48 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue, Washington	57 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2009 Every 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.