Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 216, NWS Twin Cities, MN

August 1, 20114 counties in Minnesota; Pierce County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 1, 2011, 1:25 PM CDT for 4 counties in Minnesota; Pierce County, Saint Croix County, Wisconsin. It was in force for 65 min. 4 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 1, 2011, 1:25 PM CDT (18:25 UTC)
Expired: Aug 1, 2011, 2:30 PM CDT
In force: 65 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Dakota County, MN, Hennepin County, MN, Ramsey County, MN, Washington County, MN, Pierce County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 48 km from the middle of the area, began a volume at 18:25 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 1, 1:29 PM CDT	TSTM WND DMG	5 Nne Minneapolis, MN	12 INCH DIAMETER TREE DOWN
Aug 1, 1:50 PM CDT	TSTM WND DMG	St Paul, MN	NUMEROUS 4 INCH BRANCHES DOWN AT U OF M
Aug 1, 1:55 PM CDT	TSTM WND DMG	Cottage Grove, MN	3-5 INCH BRANCHES SNAPPED
Aug 1, 1:56 PM CDT	HAIL 0.75	St Paul, MN	HEAVY RAIN STREET FLOODING GUSTS TO 43 MPH

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 1, 11:52 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 6.4 hours before the alert went out and 51 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: 2974 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 898 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

462 
WUUS53 KMPX 011825
SVRMPX
MNC037-053-123-163-WIC093-109-011930-
/O.NEW.KMPX.SV.W.0216.110801T1825Z-110801T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
125 PM CDT MON AUG 1 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN DAKOTA COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHEASTERN HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHERN RAMSEY COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHERN WASHINGTON COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHWESTERN PIERCE COUNTY IN WEST CENTRAL WISCONSIN...
  SOUTHWESTERN ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 230 PM CDT

* AT 120 PM 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
  CRYSTAL TO RICHFIELD TO BLOOMINGTON...AND MOVING EAST AT 35 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  ST PAUL...
  BURNSVILLE...
  MENDOTA...
  LAUDERDALE...
  MENDOTA HEIGHTS...
  FALCON HEIGHTS...
  EAGAN...
  APPLE VALLEY...
  LILYDALE...
  ROSEVILLE...
  WEST ST PAUL...
  INVER GROVE HEIGHTS...
  LITTLE CANADA...
  SOUTH 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.

&&

LAT...LON 4472 9332 4495 9323 4504 9322 4506 9267
      4468 9267 4471 9273 4463 9274 4463 9277
TIME...MOT...LOC 1825Z 289DEG 31KT 4504 9329 4491 9322
          4481 9329
WIND...HAIL 60MPH 1.00IN

$$

1 follow-up statement

778 
WWUS53 KMPX 011924
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
224 PM CDT MON AUG 1 2011

MNC037-053-123-163-WIC093-109-011938-
/O.EXP.KMPX.SV.W.0216.000000T0000Z-110801T1930Z/
DAKOTA MN-HENNEPIN MN-RAMSEY MN-WASHINGTON MN-ST. CROIX WI-PIERCE WI-
224 PM CDT MON AUG 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN PIERCE...
SOUTHWESTERN ST. CROIX...SOUTHERN WASHINGTON...SOUTHERN RAMSEY...
SOUTHEASTERN HENNEPIN AND NORTHERN DAKOTA COUNTIES WILL EXPIRE AT 230
PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY...HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THESE
THUNDERSTORMS.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A SEVERE
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 7 PM.

LAT...LON 4472 9332 4495 9323 4504 9322 4506 9267
      4468 9267 4471 9273 4463 9274 4463 9277
TIME...MOT...LOC 1923Z 289DEG 31KT 4488 9262 4475 9255
          4465 9263

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 6:25 AM CDT	Areal Flood Advisory	MPX	Douglas, Pope, Stevens	6 hr
Aug 1, 6:45 AM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope, Stevens, Todd	45 min
Aug 1, 7:13 AM CDT	Tornado Warning	MPX	Douglas, Pope	47 min
Aug 1, 7:27 AM CDT	Severe Thunderstorm Warning	MPX	Douglas, Kandiyohi, Morrison, Pope, Stearns, Todd	63 min
Aug 1, 8:13 AM CDT	Areal Flood Advisory	MPX	Kandiyohi, Meeker, Pope, Stearns	3 hr
Aug 1, 9:00 AM CDT	Special Weather Statement	MPX	Benton, Sherburne, Stearns, Wright	60 min
Aug 1, 9:39 AM CDT	Flash Flood Warning	MPX	Douglas, Pope	3 hr
Aug 1, 9:44 AM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Meeker	46 min
Aug 1, 10:53 AM CDT	Severe Thunderstorm Warning	MPX	Benton, Kandiyohi, Stearns	67 min
Aug 1, 11:09 AM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Meeker, Stearns	66 min
Aug 1, 11:53 AM CDT	Severe Thunderstorm Warning	MPX	Sherburne, Stearns, Wright	67 min
Aug 1, 12:03 PM CDT	Severe Thunderstorm Warning	MPX	Carver, McLeod, Meeker, Renville, Sibley	57 min
Aug 1, 12:45 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Hennepin	45 min
Aug 1, 1:01 PM CDT	Areal Flood Advisory	MPX	Carver, Dakota, Hennepin, Ramsey, Scott	3 hr
Aug 1, 1:18 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Le Sueur, Rice, Scott, Sibley	57 min
Aug 1, 2:02 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue, Le Sueur, Rice, Steele, Waseca	58 min
Aug 1, 3:04 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	37 min
Aug 1, 3:54 PM CDT	Special Weather Statement	MPX	Anoka, Chisago, Isanti, Mille Lacs	51 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2011 Severe Thunderstorm Warnings in Wisconsin, 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.