Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 254, NWS Twin Cities, MN

August 3, 2012Anoka County, Chisago County, Isanti County, Minnesota; Polk County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 3, 2012, 11:12 PM CDT for Anoka County, Chisago County, Isanti County, Minnesota; Polk County, Wisconsin. It was in force for 33 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 3, 2012, 11:12 PM CDT (04:12 UTC)
Expired: Aug 3, 2012, 11:45 PM CDT
In force: 33 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Anoka County, MN, Chisago County, MN, Isanti County, MN, Polk County, WI

The radar

The Minneapolis radar (KMPX), 95 km from the middle of the area, began a volume at 04:12 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 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
Aug 3, 10:57 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 4.2 hours before the alert went out and 97 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.

941 
WUUS53 KMPX 040412
SVRMPX
MNC003-025-059-WIC095-040445-
/O.NEW.KMPX.SV.W.0254.120804T0412Z-120804T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1112 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...
  CHISAGO COUNTY IN EAST CENTRAL MINNESOTA...
  ISANTI COUNTY IN EAST CENTRAL MINNESOTA...
  WEST CENTRAL POLK COUNTY IN NORTHWEST WISCONSIN...

* UNTIL 1145 PM CDT

* AT 1107 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING DAMAGING WINDS OF 60 MPH. THIS STORM WAS LOCATED NEAR
  BODUM...OR ABOUT OVER CAMBRIDGE...AND MOVING NORTHEAST AT 50 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  CAMBRIDGE...
  NORTH BRANCH...
  BODUM...
  ISANTI...
  ST FRANCIS...
  DALBO...
  GRANDY...
  STANCHFIELD...
  BRAHAM...
  BRANCH...
  HARRIS...
  RUSH CITY...
  WOLF CREEK...

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.

THIS STORM HAS A HISTORY OF PRODUCING 59 MPH WIND GUSTS AROUND 
ST CLOUD. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY 
FROM WINDOWS!

&&

LAT...LON 4565 9287 4565 9275 4545 9259 4535 9343
      4574 9351 4573 9286
TIME...MOT...LOC 0412Z 245DEG 41KT 4555 9317
WIND...HAIL 60MPH <.75IN

$$
SPD

1 follow-up statement

251 
WWUS53 KMPX 040440
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1140 PM CDT FRI AUG 3 2012

MNC003-025-059-WIC095-040445-
/O.CON.KMPX.SV.W.0254.000000T0000Z-120804T0445Z/
ANOKA MN-CHISAGO MN-ISANTI MN-POLK WI-
1140 PM CDT FRI AUG 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WEST CENTRAL
POLK...EASTERN ISANTI...CHISAGO AND NORTHEASTERN ANOKA COUNTIES UNTIL
1145 PM CDT...

AT 1135 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS OF 60 MPH.  THIS
STORM WAS LOCATED 7 MILES EAST OF RUSH CITY...OR 12 MILES NORTHEAST
OF NORTH BRANCH...MOVING NORTHEAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...

HARRIS...RUSH CITY...BRANCH.

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 4573 9322 4573 9286 4565 9287 4565 9275
      4545 9259 4538 9318
TIME...MOT...LOC 0439Z 245DEG 41KT 4567 9277
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, 10:44 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Benton, Isanti, Mille Lacs, Sherburne, Wright	46 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, 11:18 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
Aug 4, 12:43 AM CDT	Special Weather Statement	MPX	Barron, Chippewa, Dunn, Eau Claire, Pepin, Rusk	62 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2012 Severe Thunderstorm Warnings in Wisconsin, 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.