Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 109, NWS Twin Cities, MN

July 1, 201110 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 1, 2011, 7:49 PM CDT for 10 counties in Minnesota. It was in force for 56 min. 2 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: Jul 1, 2011, 7:49 PM CDT (00:49 UTC)
Expired: Jul 1, 2011, 8:45 PM CDT
In force: 56 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Anoka County, MN, Carver County, MN, Dakota County, MN, Hennepin County, MN, Le Sueur County, MN, Ramsey County, MN, Rice County, MN, Scott County, MN, Washington County, MN, Wright County, MN

The radar

The Minneapolis radar (KMPX), 19 km from the middle of the area, began a volume at 00:49 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
Jul 1, 8:15 PM CDT	HAIL 0.88	Minneapolis, MN	OCCURRED NEAR BROADWAY AND INTERSTATE 94.
Jul 1, 8:15 PM CDT	HAIL 1.25	5 Nnw Minneapolis, MN	MOSTLY NICKEL, SOME TO 1.25 INCHES.

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
Jul 1, 2:08 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.8 hours before the alert went out and 21 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: 4059 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 1509 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 2.5
Supercell composite: 20.8

Open this sounding in Storm Lab

The text

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

126 
WUUS53 KMPX 020049
SVRMPX
MNC003-019-037-053-079-123-131-139-163-171-020145-
/O.NEW.KMPX.SV.W.0109.110702T0049Z-110702T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
749 PM CDT FRI JUL 1 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN ANOKA COUNTY IN EAST CENTRAL MINNESOTA...
  EASTERN CARVER COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHERN DAKOTA COUNTY IN EAST CENTRAL MINNESOTA...
  HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHEASTERN LE SUEUR COUNTY IN SOUTH CENTRAL MINNESOTA...
  RAMSEY COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHWESTERN RICE COUNTY IN SOUTH CENTRAL MINNESOTA...
  SCOTT COUNTY IN EAST CENTRAL MINNESOTA...
  WASHINGTON COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHEASTERN WRIGHT COUNTY IN CENTRAL MINNESOTA...

* UNTIL 845 PM CDT

* AT 744 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DESTRUCTIVE WINDS IN EXCESS OF 70
  MPH. THIS STORM WAS LOCATED NEAR WACONIA...OR ABOUT 20 MILES
  SOUTHWEST OF PLYMOUTH...AND MOVING NORTHEAST AT 30 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  PLYMOUTH...
  MINNEAPOLIS...
  ST PAUL...
  WACONIA...
  ST BONIFACIUS...
  WATERTOWN...
  NEW PRAGUE...
  VESELI...
  LONSDALE...
  CARVER...
  VICTORIA...
  MINNETRISTA...
  DELANO...
  MARYSTOWN...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE WINDS...WHICH CAN UPROOT
TREES...DOWN POWER LINES...AND CAUSE DAMAGE TO ROOFS AND WINDOWS.
EVACUATE MOBILE HOMES AS THEY MAY BE OVERTURNED. LARGE HAIL IS ALSO
EXPECTED...WHICH CAN CAUSE DAMAGE TO VEHICLES AND WINDOWS. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4530 9338 4516 9282 4480 9281 4439 9355
      4471 9361 4500 9405
TIME...MOT...LOC 0049Z 242DEG 27KT 4484 9369
WIND...HAIL 70MPH 1.00IN

$$

JC

2 follow-up statements

253 
WWUS53 KMPX 020120
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
820 PM CDT FRI JUL 1 2011

MNC019-079-171-020135-
/O.CAN.KMPX.SV.W.0109.000000T0000Z-110702T0145Z/
CARVER MN-LE SUEUR MN-WRIGHT MN-
820 PM CDT FRI JUL 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WRIGHT...
NORTHEASTERN LE SUEUR AND NORTHEASTERN CARVER COUNTIES IS
CANCELLED...

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

LAT...LON 4454 9353 4489 9350 4516 9365 4518 9365
      4530 9338 4516 9282 4480 9281 4441 9352
TIME...MOT...LOC 0120Z 238DEG 47KT 4522 9349 4498 9312
          4453 9318

$$

MNC003-037-053-123-131-139-163-020145-
/O.CON.KMPX.SV.W.0109.000000T0000Z-110702T0145Z/
ANOKA MN-DAKOTA MN-HENNEPIN MN-RAMSEY MN-RICE MN-SCOTT MN-
WASHINGTON MN-
820 PM CDT FRI JUL 1 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WASHINGTON...
EASTERN SCOTT...NORTHWESTERN RICE...RAMSEY...HENNEPIN...NORTHERN
DAKOTA AND SOUTHERN ANOKA COUNTIES UNTIL 845 PM CDT...

AT 816 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A LINE OF
SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED
ALONG A LINE EXTENDING FROM ROGERS TO FALCON HEIGHTS TO 5 MILES
SOUTHWEST OF CASTLE ROCK...MOVING NORTHEAST AT 55 MPH.

LOCATIONS IMPACTED INCLUDE...
  ST PAUL...LILYDALE...CHAMPLIN...ROSEVILLE...FRIDLEY...NEW
  BRIGHTON...RAMSEY...ANOKA...SPRING LAKE PARK...WEST ST PAUL...ARDEN
  HILLS...LITTLE CANADA...COON RAPIDS...MOUNDS VIEW AND OAK PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE WINDS...WHICH CAN UPROOT
TREES...DOWN POWER LINES...AND CAUSE DAMAGE TO ROOFS AND WINDOWS.
EVACUATE MOBILE HOMES AS THEY MAY BE OVERTURNED. LARGE HAIL IS ALSO
EXPECTED...WHICH CAN CAUSE DAMAGE TO VEHICLES AND WINDOWS. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4454 9353 4489 9350 4516 9365 4518 9365
      4530 9338 4516 9282 4480 9281 4441 9352
TIME...MOT...LOC 0120Z 238DEG 47KT 4522 9349 4498 9312
          4453 9318
WIND...HAIL 70MPH 1.00IN

$$

JC

022 
WWUS53 KMPX 020145
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
845 PM CDT FRI JUL 1 2011

MNC003-037-053-123-131-139-163-020200-
/O.EXP.KMPX.SV.W.0109.000000T0000Z-110702T0145Z/
ANOKA MN-DAKOTA MN-HENNEPIN MN-RAMSEY MN-RICE MN-SCOTT MN-
WASHINGTON MN-
845 PM CDT FRI JUL 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR WASHINGTON...EASTERN SCOTT...
NORTHWESTERN RICE...RAMSEY...HENNEPIN...NORTHERN DAKOTA AND SOUTHERN
ANOKA COUNTIES HAS EXPIRED...

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

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT.

LAT...LON 4454 9353 4489 9350 4516 9365 4518 9365
      4530 9338 4516 9282 4480 9281 4441 9352
TIME...MOT...LOC 0145Z 238DEG 47KT 4539 9308 4514 9272
          4469 9279

$$

JC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 7:10 PM CDT	Special Weather Statement	MPX	Chisago	35 min
Jul 1, 7:23 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Le Sueur, McLeod, Nicollet, Scott, Sibley	37 min
Jul 1, 7:24 PM CDT	Severe Thunderstorm Warning	MPX	Chisago, Washington	66 min
Jul 1, 7:30 PM CDT	Areal Flood Warning	MPX	Meeker	3 hr
Jul 1, 7:38 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Faribault, Waseca	37 min
Jul 1, 7:39 PM CDT	Areal Flood Warning	MPX	Benton, Morrison	3 hr
Jul 1, 7:45 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Martin	45 min
Jul 1, 7:59 PM CDT	Areal Flood Advisory	MPX	Anoka, Carver, Dakota, Hennepin, Ramsey, Scott and 1 more	105 min
Jul 1, 8:03 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Dakota, Faribault, Freeborn, Goodhue, Le Sueur and 3 more	57 min
Jul 1, 8:27 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue, Washington	63 min
Jul 1, 8:31 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Chisago, Isanti, Washington	59 min
Jul 1, 8:59 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Freeborn, Steele, Waseca	61 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.