Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 253, NWS Twin Cities, MN

August 3, 20128 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 3, 2012, 11:06 PM CDT for 8 counties in Minnesota. It was in force for 39 min. 20 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, 11:06 PM CDT (04:06 UTC)
Expired: Aug 3, 2012, 11:45 PM CDT
In force: 39 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, Chisago County, MN, Dakota County, MN, Hennepin County, MN, Ramsey County, MN, Scott County, MN, Washington County, MN

The radar

The Minneapolis radar (KMPX), 62 km from the middle of the area, began a volume at 04:07 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, 11:10 PM CDT	TSTM WND DMG	1 N Fridley, MN	TREE DOWN BLOCKING INTERSECTION NEAR HIGHWAY 47 AND 69TH AVE.
Aug 3, 11:10 PM CDT	TSTM WND DMG	5 Nnw Blaine, MN	SEVERAL TREES DOWN BLOCKING ROAD IN HAM LAKE NEAR HIGHWAY 65 AND COUNTY ROAD 16.
Aug 3, 11:12 PM CDT	TSTM WND DMG	Bloomington, MN	FOUR INCH DIAMETER TREE BRANCHES REPORTED NEAR 92ND AND KNOX AVE.
Aug 3, 11:15 PM CDT	TSTM WND DMG	2 E Bloomington, MN	36 INCH DIAMETER TREE TOPPLED NEAR BLAISDELL AND 96TH IN BLOOMINGTON.
Aug 3, 11:15 PM CDT	TSTM WND DMG	4 N Blaine, MN	TREE DOWN ACROSS ROAD NEAR BUNKER LAKE BLVD AND RADISSON IN HAM LAKE.
Aug 3, 11:15 PM CDT	TSTM WND DMG	Savage, MN	TREE DOWN NEAR 144TH
Aug 3, 11:19 PM CDT	HAIL 0.88	3 Nnw Minneapolis, MN	NICKEL-SIZED HAIL REPORTED AT BROADWAY AVE AND INTERSTATE 94.
Aug 3, 11:20 PM CDT	TSTM WND DMG	5 Ese Ham Lake, MN	SIX INCH TREE SNAPPED.
Aug 3, 11:20 PM CDT	TSTM WND DMG	Minneapolis, MN	10 INCH TREE BRANCH IN DOWNTOWN MINNEAPOLIS
Aug 3, 11:25 PM CDT	TSTM WND DMG	4 Ssw Minneapolis, MN	SIX INCH BRANCHES DOWN.
Aug 3, 11:30 PM CDT	TSTM WND DMG	3 W Forest Lake, MN	TREE DOWN ACROSS ROAD IN COLUMBUS.
Aug 3, 11:30 PM CDT	TSTM WND DMG	Maplewood, MN	TEN INCH DIAMETER TREE TOPPLED.
Aug 3, 11:30 PM CDT	TSTM WND DMG	Mendota Heights, MN	FEW TREES DOWN...INCLUDING ONE BLOCKING A ROAD.
Aug 3, 11:30 PM CDT	TSTM WND GST 59	Ene Falcon Heights, MN	MEASURED NEAR LARPENTEUR AVENUE AND SNELLING AVE.
Aug 3, 11:30 PM CDT	TSTM WND GST 59	Falcon Heights, MN	MEASURED BY HAND HELD ANEMOMETER.
Aug 3, 11:35 PM CDT	TSTM WND DMG	2 Se St Paul Park, MN	SIX INCH DIAMETER TREE DOWN AT GRANADA AND 90TH STREET IN COTTAGE GROVE.
Aug 3, 11:40 PM CDT	TSTM WND DMG	3 S Lindstrom, MN	SEVERAL EIGHT INCH BRANCHES DOWN.
Aug 3, 11:40 PM CDT	TSTM WND DMG	St Paul Park, MN	FEW TREES DOWN...INCLUDING ON POWER LINES.
Aug 3, 11:45 PM CDT	TSTM WND DMG	Bayport, MN	FEW TREES DOWN...INCLUDING ON POWER LINES.
Aug 3, 11:50 PM CDT	TSTM WND DMG	Hugo, MN	POWER OUTAGE REPORTED IN CITY.

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, 4.1 hours before the alert went out and 65 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.

683 
WUUS53 KMPX 040406
SVRMPX
MNC003-019-025-037-053-123-139-163-040445-
/O.NEW.KMPX.SV.W.0253.120804T0406Z-120804T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1106 PM CDT FRI AUG 3 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ANOKA COUNTY IN EAST CENTRAL MINNESOTA...
  EXTREME EAST CENTRAL CARVER COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHERN CHISAGO COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHWESTERN DAKOTA COUNTY IN EAST CENTRAL MINNESOTA...
  HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA...
  RAMSEY COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHEASTERN SCOTT COUNTY IN EAST CENTRAL MINNESOTA...
  WASHINGTON COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 1145 PM CDT

* AT 1102 PM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS...
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS OF 60
  MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM ISANTI
  TO BROOKLYN PARK TO WAYZATA...AND MOVING EAST AT 40 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  PLYMOUTH...
  MINNEAPOLIS...
  FOREST LAKE...
  ST PAUL...
  COON RAPIDS...
  NEW HOPE...
  MEDICINE LAKE...
  CEDAR...
  BROOKLYN PARK...
  ANDOVER...
  OSSEO...
  CHAMPLIN...
  ANOKA...
  WAYZATA...

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 4546 9267 4544 9264 4540 9265 4536 9270
      4532 9271 4528 9277 4511 9274 4508 9280
      4505 9280 4503 9276 4486 9277 4471 9329
      4471 9349 4500 9361 4536 9348
TIME...MOT...LOC 0406Z 270DEG 35KT 4547 9326 4512 9331
          4497 9342
WIND...HAIL 60MPH 1.00IN

$$
SPD

1 follow-up statement

072 
WWUS53 KMPX 040441
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1141 PM CDT FRI AUG 3 2012

MNC139-040456-
/O.CAN.KMPX.SV.W.0253.000000T0000Z-120804T0445Z/
SCOTT MN-
1141 PM CDT FRI AUG 3 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SCOTT COUNTY IS
CANCELLED...

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

LAT...LON 4544 9264 4540 9265 4536 9270 4532 9271
      4528 9277 4511 9274 4508 9280 4505 9280
      4503 9276 4486 9277 4471 9329 4510 9319
      4540 9317 4546 9267
TIME...MOT...LOC 0441Z 270DEG 35KT 4546 9277 4512 9283
          4497 9294

$$

MNC003-025-037-053-123-163-040445-
/O.CON.KMPX.SV.W.0253.000000T0000Z-120804T0445Z/
ANOKA MN-CHISAGO MN-DAKOTA MN-HENNEPIN MN-RAMSEY MN-WASHINGTON MN-
1141 PM CDT FRI AUG 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WASHINGTON...
RAMSEY...SOUTHEASTERN HENNEPIN...NORTHWESTERN DAKOTA...SOUTHERN
CHISAGO AND EASTERN ANOKA COUNTIES UNTIL 1145 PM CDT...

AT 1139 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 5 MILES NORTH
OF CENTER CITY TO STILLWATER TO OAKDALE...MOVING EAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  LAKE ELMO...COTTAGE GROVE...WOODBURY...SHAFER...MARINE ON ST
  CROIX...STILLWATER...BAYPORT...TAYLORS FALLS...OAK PARK HEIGHTS AND
  AFTON.

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 4544 9264 4540 9265 4536 9270 4532 9271
      4528 9277 4511 9274 4508 9280 4505 9280
      4503 9276 4486 9277 4471 9329 4510 9319
      4540 9317 4546 9267
TIME...MOT...LOC 0441Z 270DEG 35KT 4546 9277 4512 9283
          4497 9294
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, 11:12 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.