Alert archive / Minnesota / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 70, NWS Twin Cities, MN

August 2, 2009Blue Earth County, Brown County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 2, 2009, 10:43 PM CDT for Blue Earth County, Brown County, Minnesota. It was in force for 47 min. 1 report 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, 10:43 PM CDT (03:43 UTC)
Expired: Aug 2, 2009, 11:30 PM CDT
In force: 47 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon

Counties Blue Earth County, MN, Brown County, MN

The radar

The Minneapolis radar (KMPX), 97 km from the middle of the area, began a volume at 03:44 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	Remark
Aug 2, 10:50 PM CDT	HAIL 1	3 E Madelia, MN	HAILED ABOUT FIVE MINUTES AND ENDED AT 1055 PM. GUSTY WIND ACCOMPANIED THE HAIL AND TOOK DOWN SMALL BRANCHES.

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, 3.7 hours before the alert went out and 96 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 030343
SVRMPX
MNC013-015-030430-
/O.NEW.KMPX.SV.W.0070.090803T0343Z-090803T0430Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1043 PM CDT SUN AUG 2 2009

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN BROWN COUNTY IN SOUTH CENTRAL MINNESOTA...
  BLUE EARTH COUNTY IN SOUTH CENTRAL MINNESOTA...

* UNTIL 1130 PM CDT

* AT 1042 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING HALF DOLLAR SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 
  MPH. THIS STORM WAS LOCATED 18 MILES NORTHWEST OF VERNON           
  CENTER...OR ABOUT 10 MILES NORTHEAST OF ST JAMES...AND MOVING EAST 
  AT 55 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  VERNON CENTER...
  AMBOY...
  GOOD THUNDER...
  MAPLETON...

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 4411 9437 4411 9449 4412 9450 4427 9439
      4425 9430 4422 9425 4420 9416 4416 9408
      4417 9403 4413 9391 4385 9394 4385 9437
TIME...MOT...LOC 0343Z 282DEG 46KT 4409 9446

$$

2 follow-up statements

000 
WWUS53 KMPX 030401
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1101 PM CDT SUN AUG 2 2009

MNC013-030430-
/O.CON.KMPX.SV.W.0070.000000T0000Z-090803T0430Z/
BLUE EARTH MN-
1101 PM CDT SUN AUG 2 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT 
FOR BLUE EARTH COUNTY...

AT 1100 PM CDT...RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM...
CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
OF 60 MPH. THE SEVERE STORM WAS LOCATED 4 MILES SOUTH OF LAKE
CRYSTAL...OR ABOUT 6 MILES NORTHWEST OF VERNON CENTER...AND MOVING
EAST AT 40 MPH.

LOCATIONS IN THE WARNING INCLUDE...
VERNON CENTER...GOOD THUNDER...MAPLETON AND SKYLINE.

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 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 4385 9404 4396 9433 4413 9434 4420 9416
      4416 9408 4417 9403 4413 9391 4385 9394
TIME...MOT...LOC 0401Z 283DEG 34KT 4404 9420

$$

000 
WWUS53 KMPX 030419
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1119 PM CDT SUN AUG 2 2009

MNC013-030429-
/O.CAN.KMPX.SV.W.0070.000000T0000Z-090803T0430Z/
BLUE EARTH MN-
1119 PM CDT SUN AUG 2 2009

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BLUE EARTH COUNTY IS
CANCELLED...

RADAR INDICATED THAT THE SEVERE STORM HAD WEAKENED. THEREFORE...THE 
SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

REPORT ANY SEVERE WEATHER THAT OCCURRED TO YOUR LOCAL LAW 
ENFORCEMENT 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 4385 9404 4396 9433 4413 9434 4420 9416
      4416 9408 4417 9403 4413 9391 4385 9394
TIME...MOT...LOC 0419Z 283DEG 34KT 4400 9397

$$

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, 10:06 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Sibley	54 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, 10:56 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.