Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 251, NWS Twin Cities, MN

August 3, 20126 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 3, 2012, 10:44 PM CDT for 6 counties in Minnesota. It was in force for 46 min. 3 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 3, 2012, 10:44 PM CDT (03:44 UTC)
Expired: Aug 3, 2012, 11:30 PM CDT
In force: 46 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Anoka County, MN, Benton County, MN, Isanti County, MN, Mille Lacs County, MN, Sherburne County, MN, Wright County, MN

The radar

The Minneapolis radar (KMPX), 72 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 3, 10:50 PM CDT	TSTM WND DMG	N Foley, MN	TREE DOWN ACROSS POWER LINE IN DOWNTOWN AREA.
Aug 3, 11:10 PM CDT	TSTM WND DMG	4 Nnw East Bethel, MN	TREE DOWN ACROSS ROAD NEAR HIGHWAY 65 AND COUNTY ROAD 24 IN EAST BETHEL.
Aug 3, 11:20 PM CDT	TSTM WND DMG	Ne Cambridge, MN	TREE DOWN NEAR EMERSON AVENUE.

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 3, 7:33 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 72 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: 576 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 1840 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 257 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 7.5

Open this sounding in Storm Lab

The text

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

569 
WUUS53 KMPX 040344
SVRMPX
MNC003-009-059-095-141-171-040430-
/O.NEW.KMPX.SV.W.0251.120804T0344Z-120804T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1044 PM CDT FRI AUG 3 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN ANOKA COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHERN BENTON COUNTY IN CENTRAL MINNESOTA...
  ISANTI COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHERN MILLE LACS COUNTY IN EAST CENTRAL MINNESOTA...
  SHERBURNE COUNTY IN CENTRAL MINNESOTA...
  NORTH CENTRAL WRIGHT COUNTY IN CENTRAL MINNESOTA...

* UNTIL 1130 PM CDT

* AT 1039 PM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS...
  CAPABLE OF PRODUCING DAMAGING WINDS OF 60 MPH. THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM FOLEY TO 7 MILES WEST OF
  ZIMMERMAN TO ALBERTVILLE...AND MOVING EAST AT 50 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  PRINCETON...
  CAMBRIDGE...
  SANTIAGO...
  FOLEY...
  BIG LAKE...
  MONTICELLO...
  BECKER...
  CLEAR LAKE...
  HASTY...
  CLEARWATER...
  GLENDORADO...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS IN EXCESS OF 60 MPH. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4548 9311 4536 9311 4527 9395 4549 9410
      4567 9417 4573 9322
TIME...MOT...LOC 0343Z 267DEG 42KT 4567 9383 4545 9367
          4527 9366
WIND...HAIL 60MPH <.75IN

$$
SPD

1 follow-up statement

096 
WWUS53 KMPX 040414
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1114 PM CDT FRI AUG 3 2012

MNC009-141-171-040429-
/O.CAN.KMPX.SV.W.0251.000000T0000Z-120804T0430Z/
BENTON MN-SHERBURNE MN-WRIGHT MN-
1114 PM CDT FRI AUG 3 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL WRIGHT...
SHERBURNE AND SOUTHERN BENTON COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA.

LAT...LON 4548 9311 4536 9311 4536 9349 4546 9352
      4556 9351 4556 9357 4568 9370 4573 9322
TIME...MOT...LOC 0414Z 267DEG 42KT 4568 9331 4546 9315
          4528 9315

$$

MNC003-059-095-040430-
/O.CON.KMPX.SV.W.0251.000000T0000Z-120804T0430Z/
ANOKA MN-ISANTI MN-MILLE LACS MN-
1114 PM CDT FRI AUG 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL
MILLE LACS...ISANTI AND NORTHWESTERN ANOKA COUNTIES UNTIL 1130 PM
CDT...

AT 1112 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A LINE OF
SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS OF 60 MPH. 
THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM DALBO TO ISANTI
TO HAM LAKE...MOVING EAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  GRANDY...CAMBRIDGE...ISANTI...DALBO...BETHEL.

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 4548 9311 4536 9311 4536 9349 4546 9352
      4556 9351 4556 9357 4568 9370 4573 9322
TIME...MOT...LOC 0414Z 267DEG 42KT 4568 9331 4546 9315
          4528 9315
WIND...HAIL 60MPH <.75IN

$$
SPD

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 7:14 PM CDT	Special Weather Statement	MPX	Chippewa, Lac qui Parle, Swift, Yellow Medicine	46 min
Aug 3, 7:37 PM CDT	Severe Thunderstorm Warning	MPX	Lac qui Parle, Yellow Medicine	53 min
Aug 3, 8:20 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle, Renville, Swift, Yellow Medicine	55 min
Aug 3, 8:26 PM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope, Stevens	49 min
Aug 3, 9:01 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Redwood, Renville, Yellow Medicine	59 min
Aug 3, 9:07 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Meeker, Pope, Renville, Stearns and 2 more	53 min
Aug 3, 9:47 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, McLeod, Nicollet, Redwood, Renville and 1 more	58 min
Aug 3, 9:52 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Meeker, Renville, Sherburne, Stearns, Wright	38 min
Aug 3, 10:25 PM CDT	Special Weather Statement	MPX	Anoka, Carver, Hennepin, McLeod, Sherburne, Wright	65 min
Aug 3, 10:29 PM CDT	Special Weather Statement	MPX	Le Sueur, Nicollet, Rice, Scott	61 min
Aug 3, 10:39 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Hennepin	36 min
Aug 3, 10:54 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Carver, Hennepin, Sherburne, Wright	25 min
Aug 3, 11:01 PM CDT	Special Weather Statement	MPX	Blue Earth, Faribault, Freeborn, Martin, Steele, Waseca	44 min
Aug 3, 11:06 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Carver, Chisago, Dakota, Hennepin, Ramsey and 2 more	39 min
Aug 3, 11:12 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Chisago, Isanti	33 min
Aug 3, 11:18 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue, Rice, Scott, Washington	42 min
Aug 3, 11:38 PM CDT	Severe Thunderstorm Warning	MPX	Chisago, Washington	67 min
Aug 3, 11:44 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue, Washington	61 min
Aug 4, 12:19 AM CDT	Special Weather Statement	MPX	Brown	26 min
Aug 4, 1:13 AM CDT	Special Weather Statement	MPX	Martin	47 min
Aug 4, 1:25 AM CDT	Severe Thunderstorm Warning	MPX	Faribault, Martin	65 min
Aug 4, 4:28 AM CDT	Special Weather Statement	MPX	Faribault	47 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2012 Every severe thunderstorm warning in 2012

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.