Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 247, NWS Twin Cities, MN

August 23, 2011Anoka County, Dakota County, Ramsey County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 23, 2011, 5:30 AM CDT for Anoka County, Dakota County, Ramsey County, Minnesota. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 23, 2011, 5:30 AM CDT (10:30 UTC)
Expired: Aug 23, 2011, 6:16 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, Dakota County, MN, Ramsey County, MN

The radar

The Minneapolis radar (KMPX), 41 km from the middle of the area, began a volume at 10:30 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.

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, 10.5 hours before the alert went out and 43 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.

357 
WUUS53 KMPX 231030
SVRMPX
MNC003-037-123-231130-
/O.NEW.KMPX.SV.W.0247.110823T1030Z-110823T1130Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN ANOKA COUNTY IN EAST CENTRAL MINNESOTA...
  NORTH CENTRAL DAKOTA COUNTY IN EAST CENTRAL MINNESOTA...
  RAMSEY COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 630 AM CDT

* AT 526 AM CDT...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   
  RAMSEY TO EDEN PRAIRIE...AND MOVING EAST AT 45 MPH. THESE STORMS   
  PRODUCED WINDS IN EXCESS OF 60 MPH IN BUFFALO AND HAVE CONTINUED
  AT THE SAME INTENSITY.

LOCATIONS IN THE WARNING INCLUDE...
  ST PAUL...
  RAMSEY...
  ANDOVER...
  BLAINE...
  HAM LAKE...
  MOUNDS VIEW...
  NEW BRIGHTON...
  FALCON HEIGHTS...
  LEXINGTON...
  ARDEN HILLS...
  CIRCLE PINES...
  MENDOTA...
  ROSEVILLE...
  SHOREVIEW...

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 4530 9302 4513 9302 4512 9298 4489 9298
      4488 9301 4482 9301 4482 9323 4489 9317
      4491 9320 4522 9324 4525 9351 4531 9341
TIME...MOT...LOC 1028Z 262DEG 39KT 4532 9341 4483 9344
WIND...HAIL 60MPH 1.00IN

$$

4 follow-up statements

481 
WWUS53 KMPX 231040
SVSMPX

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

MNC003-037-123-231130-
/O.CON.KMPX.SV.W.0247.000000T0000Z-110823T1130Z/
ANOKA MN-DAKOTA MN-RAMSEY MN-
540 AM CDT TUE AUG 23 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR RAMSEY...NORTH
CENTRAL DAKOTA AND SOUTHERN ANOKA COUNTIES UNTIL 630 AM CDT...

AT 540 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 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  ST PAUL...EAGAN...NEW BRIGHTON...MOUNDS VIEW...BLAINE...FALCON
  HEIGHTS...MENDOTA...HAM LAKE...ARDEN HILLS...MENDOTA HEIGHTS...
  ROSEVILLE...LEXINGTON...CIRCLE PINES...LILYDALE AND SHOREVIEW.

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.

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 4530 9302 4513 9302 4512 9298 4489 9298
      4488 9301 4482 9301 4482 9323 4489 9317
      4491 9320 4522 9324 4525 9351 4531 9341
TIME...MOT...LOC 1040Z 263DEG 43KT 4526 9324 4483 9319
WIND...HAIL 60MPH <.75IN

$$

337 
WWUS53 KMPX 231048
SVSMPX

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

MNC003-037-123-231130-
/O.CON.KMPX.SV.W.0247.000000T0000Z-110823T1130Z/
ANOKA MN-DAKOTA MN-RAMSEY MN-
548 AM CDT TUE AUG 23 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR RAMSEY...NORTH
CENTRAL DAKOTA AND SOUTHERN ANOKA COUNTIES UNTIL 630 AM CDT...

AT 547 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 HAM 
LAKE TO JUST NORTH OF EAGAN...MOVING EAST AT 50 MPH. STRONG WINDS 
MAY PERSIST FOR UP TO 20 MINUTES AFTER THE WIND SPEEDS INITIALLY 
INCREASE.

LOCATIONS IMPACTED INCLUDE...
  ST PAUL...SHOREVIEW...LILYDALE...NORTH OAKS...WEST ST PAUL...LITTLE
  CANADA...LINO LAKES...VADNAIS HEIGHTS...INVER GROVE HEIGHTS...
  CENTERVILLE...SOUTH ST PAUL...MAPLEWOOD...WHITE BEAR LAKE...NORTH
  ST PAUL AND SUNFISH.

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.

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 4513 9302 4512 9298 4489 9298 4488 9301
      4482 9301 4482 9323 4489 9317 4491 9320
      4522 9324 4524 9342 4531 9335 4530 9302
TIME...MOT...LOC 1047Z 263DEG 43KT 4527 9315 4486 9315
WIND...HAIL 60MPH <.75IN

$$

291 
WWUS53 KMPX 231101
SVSMPX

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

MNC003-037-123-231130-
/O.CON.KMPX.SV.W.0247.000000T0000Z-110823T1130Z/
ANOKA MN-DAKOTA MN-RAMSEY MN-
601 AM CDT TUE AUG 23 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR RAMSEY...NORTH
CENTRAL DAKOTA AND SOUTHEASTERN ANOKA COUNTIES UNTIL 630 AM CDT...

AT 600 AM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED THAT WINDS 
NEAR 60 MPH WERE STILL POSSIBLE ACROSS PARTS OF 
RAMSEY...DAKOTA...AND ANOKA COUNTIES. THE LEADING EDGE OF STORMS HAD 
ALREADY PUSHED THROUGH AND WEAKENED...BUT GUSTY WINDS WERE STILL 
BEING OBSERVED.

LOCATIONS IMPACTED INCLUDE...ST. PAUL...LINO LAKES...MAPLEWOOD...AND 
MENDOTA HEIGHTS.

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.

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 4527 9302 4513 9302 4512 9298 4489 9298
      4488 9301 4483 9301 4484 9314 4491 9320
      4522 9324
TIME...MOT...LOC 1100Z 263DEG 43KT 4528 9294 4487 9294
WIND...HAIL 60MPH <.75IN

$$

724 
WWUS53 KMPX 231116
SVSMPX

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

MNC003-037-123-231131-
/O.CAN.KMPX.SV.W.0247.000000T0000Z-110823T1130Z/
ANOKA MN-DAKOTA MN-RAMSEY MN-
616 AM CDT TUE AUG 23 2011

...THE SEVERE THUNDERSTORM WARNING FOR RAMSEY...NORTH CENTRAL DAKOTA
AND SOUTHEASTERN ANOKA COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED AND MOVED
OUT OF THE WARNED AREA. WIND SPEEDS OF 35 TO 45 MPH WILL STILL OCCUR 
ACROSS THE AREA THROUGH 630 AM.

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 4527 9302 4513 9302 4512 9298 4489 9298
      4488 9301 4483 9301 4484 9314 4491 9320
      4522 9324
TIME...MOT...LOC 1116Z 263DEG 43KT 4530 9267 4489 9267

$$

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, 5:12 AM CDT	Severe Thunderstorm Warning	MPX	Anoka, Carver, Hennepin, Wright	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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.