Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 246, NWS Twin Cities, MN

August 23, 20114 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 23, 2011, 5:12 AM CDT for 4 counties in Minnesota. It was in force for 46 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 23, 2011, 5:12 AM CDT (10:12 UTC)
Expired: Aug 23, 2011, 5:58 AM CDT
In force: 46 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Anoka County, MN, Carver County, MN, Hennepin County, MN, Wright County, MN

The radar

The Minneapolis radar (KMPX), 17 km from the middle of the area, began a volume at 10:12 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 23, 5:45 AM CDT	TSTM WND DMG	Bloomington, MN	2 INCH BRANCH DOWN AND DAMAGED GUTTER.

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 23, 3:34 AM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 10.2 hours before the alert went out and 18 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: 114 J/kg
Mixed-layer CIN: -258 J/kg
Mixed-layer LCL: 1559 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

486 
WUUS53 KMPX 231012
SVRMPX
MNC003-019-053-171-231115-
/O.NEW.KMPX.SV.W.0246.110823T1012Z-110823T1115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
512 AM CDT TUE AUG 23 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN ANOKA COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHERN CARVER COUNTY IN EAST CENTRAL MINNESOTA...
  HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA...
  EASTERN WRIGHT COUNTY IN CENTRAL MINNESOTA...

* UNTIL 615 AM CDT

* AT 507 AM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS...
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
  OF 60 MPH. WINDS IN EXCESS OF 60 MPH WERE MEASURED IN BUFFALO WITH 
  THESE STORMS. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING     
  FROM BIG LAKE TO WATERTOWN...AND MOVING EAST AT 35 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  PLYMOUTH...
  MINNEAPOLIS...
  DELANO...
  WATERTOWN...
  MAYER...
  ROCKFORD...
  WACONIA...
  ALBERTVILLE...
  ST MICHAEL...
  ST BONIFACIUS...
  INDEPENDENCE...
  HANOVER...
  MINNETRISTA...
  MAPLE PLAIN...
  LAKE MINNETONKA...
  MINNEAPOLIS ST. PAUL INTERNATIONAL AIRPORT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS IN EXCESS OF 60 MPH 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.

&&

LAT...LON 4522 9324 4512 9322 4491 9320 4489 9317
      4484 9320 4481 9325 4478 9338 4481 9343
      4480 9357 4485 9387 4494 9400 4528 9375
TIME...MOT...LOC 1010Z 282DEG 32KT 4530 9369 4492 9378
WIND...HAIL 60MPH 1.00IN

$$

4 follow-up statements

605 
WWUS53 KMPX 231024
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
524 AM CDT TUE AUG 23 2011

MNC003-019-053-171-231115-
/O.CON.KMPX.SV.W.0246.000000T0000Z-110823T1115Z/
ANOKA MN-CARVER MN-HENNEPIN MN-WRIGHT MN-
524 AM CDT TUE AUG 23 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
WRIGHT...HENNEPIN...NORTHERN CARVER AND SOUTHWESTERN ANOKA COUNTIES
UNTIL 615 AM CDT...

AT 522 AM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A LINE OF
SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND 
DAMAGING WINDS IN EXCESS OF 60 MPH. WIND SPEEDS IN EXCESS OF 60 MPH 
HAVE BEEN MEASURED WITH THESE STORMS IN BUFFALO. THESE STORMS WERE 
LOCATED ALONG A LINE EXTENDING FROM RAMSEY TO CHASKA...MOVING EAST 
AT 50 MPH. WIND SPEEDS OF 40 TO 60 MPH ARE LIKELY TO PERSIST FOR UP 
TO 20 MINUTES AFTER THE WINDS INITIALLY INCREASE IN SPEEDS.

LOCATIONS IMPACTED INCLUDE...
  MINNEAPOLIS...ANOKA...CHAMPLIN...OSSEO...EDEN PRAIRIE...MEDICINE
  LAKE...NEW HOPE...HOPKINS...BROOKLYN PARK...CRYSTAL...GOLDEN       
  VALLEY...COON RAPIDS...ST LOUIS PARK...ROBBINSDALE...BROOKLYN      
  CENTER...LAKE MINNETONKA...AND THE MINNEAPOLIS ST. PAUL            
  INTERNATIONAL AIRPORT.

LAT...LON 4522 9324 4512 9322 4491 9320 4489 9317
      4484 9320 4481 9325 4478 9338 4481 9343
      4480 9357 4485 9387 4494 9400 4528 9375
TIME...MOT...LOC 1022Z 288DEG 45KT 4522 9341 4481 9351
WIND...HAIL 60MPH 1.00IN

$$

992 
WWUS53 KMPX 231033
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
533 AM CDT TUE AUG 23 2011

MNC171-231047-
/O.CAN.KMPX.SV.W.0246.000000T0000Z-110823T1115Z/
WRIGHT MN-
533 AM CDT TUE AUG 23 2011

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

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF 
WRIGHT COUNTY.

REPORT ANY DAMAGE TO YOUR LOCAL LAW ENFORCEMENT FOR RELAY TO THE 
NATIONAL WEATHER SERVICE.

LAT...LON 4522 9324 4491 9320 4489 9317 4484 9321
      4481 9325 4478 9338 4481 9343 4480 9357
      4484 9383 4511 9372 4523 9355 4522 9353
      4526 9350
TIME...MOT...LOC 1032Z 288DEG 48KT 4525 9330 4484 9336

$$

MNC003-019-053-231115-
/O.CON.KMPX.SV.W.0246.000000T0000Z-110823T1115Z/
ANOKA MN-CARVER MN-HENNEPIN MN-
533 AM CDT TUE AUG 23 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR HENNEPIN...
NORTHEASTERN CARVER AND SOUTHWESTERN ANOKA COUNTIES UNTIL 615 AM
CDT...

AT 530 AM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A LINE OF
SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG
A LINE EXTENDING FROM ANDOVER TO EDEN PRAIRIE...MOVING EAST AT 50 
MPH. THESE STORMS PRODUCED WINDS IN EXCESS OF 60 MPH IN BUFFALO.

LOCATIONS IMPACTED INCLUDE...
  MINNEAPOLIS...OAK PARK...FRIDLEY...BLOOMINGTON...SPRING LAKE
  PARK...RICHFIELD...HILLTOP AND COLUMBIA HEIGHTS.

LAT...LON 4522 9324 4491 9320 4489 9317 4484 9321
      4481 9325 4478 9338 4481 9343 4480 9357
      4484 9383 4511 9372 4523 9355 4522 9353
      4526 9350
TIME...MOT...LOC 1032Z 288DEG 48KT 4525 9330 4484 9336
WIND...HAIL 60MPH 1.00IN

$$

335 
WWUS53 KMPX 231045
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
545 AM CDT TUE AUG 23 2011

MNC003-019-053-231115-
/O.CON.KMPX.SV.W.0246.000000T0000Z-110823T1115Z/
ANOKA MN-CARVER MN-HENNEPIN MN-
545 AM CDT TUE AUG 23 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
HENNEPIN...EAST CENTRAL CARVER AND SOUTH CENTRAL ANOKA COUNTIES UNTIL
615 AM CDT...

AT 544 AM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A LINE OF
SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 
ANDOVER TO BLOOMINGTON...MOVING EAST AT 55 MPH. STRONG WIND SPEEDS 
WILL PERSIST FOR UP TO 20 MINUTES AFTER THE WINDS INITIALLY INCREASE.

LOCATIONS IMPACTED INCLUDE...
  MINNEAPOLIS...PLYMOUTH...EDEN PRAIRIE...ANOKA...COON RAPIDS...AND  
  THE MINNEAPOLIS ST. PAUL INTERNATIONAL AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...LARGE HAIL...AND DEADLY LIGHTNING. FOR YOUR PROTECTION MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.

&&

LAT...LON 4525 9344 4522 9324 4491 9320 4489 9317
      4484 9321 4481 9325 4478 9338 4481 9343
      4480 9357 4481 9359 4505 9357
TIME...MOT...LOC 1044Z 287DEG 48KT 4520 9320 4477 9325
WIND...HAIL 60MPH <.75IN

$$

308 
WWUS53 KMPX 231058
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
558 AM CDT TUE AUG 23 2011

MNC003-019-053-231112-
/O.CAN.KMPX.SV.W.0246.000000T0000Z-110823T1115Z/
ANOKA MN-CARVER MN-HENNEPIN MN-
558 AM CDT TUE AUG 23 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN HENNEPIN...EXTREME
EAST CENTRAL CARVER AND SOUTH CENTRAL ANOKA COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE 
WARNED AREA. WINDS OF 35 TO 45 MPH WILL CONTINUE OVER EASTERN 
HENNEPIN AND SOUTHERN ANOKA COUNTY THROUGH 615 AM CDT.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN THE TWIN CITIES.

LAT...LON 4525 9344 4522 9324 4491 9320 4489 9317
      4484 9321 4481 9325 4478 9338 4481 9343
      4480 9357 4481 9359 4505 9357
TIME...MOT...LOC 1057Z 287DEG 48KT 4514 9296 4471 9302

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 23, 12:08 AM CDT	Special Weather Statement	MPX	Martin, Watonwan	52 min
Aug 23, 12:44 AM CDT	Special Weather Statement	MPX	Redwood	46 min
Aug 23, 1:24 AM CDT	Special Weather Statement	MPX	Renville	51 min
Aug 23, 2:01 AM CDT	Special Weather Statement	MPX	Nicollet	44 min
Aug 23, 2:04 AM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Nicollet	26 min
Aug 23, 2:13 AM CDT	Special Weather Statement	MPX	Douglas, Stevens	62 min
Aug 23, 2:24 AM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope, Stevens, Todd	66 min
Aug 23, 2:30 AM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Nicollet, Rice, Sibley	45 min
Aug 23, 2:51 AM CDT	Special Weather Statement	MPX	Freeborn	39 min
Aug 23, 2:55 AM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope, Stearns, Stevens, Swift, Todd	65 min
Aug 23, 2:57 AM CDT	Special Weather Statement	MPX	Carver	48 min
Aug 23, 3:08 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle, Swift	67 min
Aug 23, 3:12 AM CDT	Severe Thunderstorm Warning	MPX	Scott	33 min
Aug 23, 3:38 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Lac qui Parle, Meeker, Pope, Stearns and 2 more	56 min
Aug 23, 3:40 AM CDT	Special Weather Statement	MPX	Dakota	50 min
Aug 23, 4:04 AM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, McLeod, Meeker, Renville, Stearns, Yellow Medicine	56 min
Aug 23, 4:28 AM CDT	Special Weather Statement	MPX	Benton, Isanti, McLeod, Renville, Sherburne, Wright	47 min
Aug 23, 5:30 AM CDT	Severe Thunderstorm Warning	MPX	Anoka, Dakota, Ramsey	46 min
Aug 23, 5:52 AM CDT	Special Weather Statement	MPX	Washington	38 min
Aug 23, 6:12 AM CDT	Severe Thunderstorm Warning	MPX	Faribault	33 min
Aug 23, 6:42 AM CDT	Special Weather Statement	MPX	Freeborn	33 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2011 Every severe thunderstorm warning in 2011

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.