Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 215, NWS Twin Cities, MN

August 1, 20115 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 1, 2011, 1:18 PM CDT for 5 counties in Minnesota. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 1, 2011, 1:18 PM CDT (18:18 UTC)
Expired: Aug 1, 2011, 2:15 PM CDT
In force: 57 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Dakota County, MN, Le Sueur County, MN, Rice County, MN, Scott County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 32 km from the middle of the area, began a volume at 18:20 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.

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, 6.3 hours before the alert went out and 32 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.

005 
WUUS53 KMPX 011818
SVRMPX
MNC037-079-131-139-143-011915-
/O.NEW.KMPX.SV.W.0215.110801T1818Z-110801T1915Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN DAKOTA COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHERN LE SUEUR COUNTY IN SOUTH CENTRAL MINNESOTA...
  NORTHWESTERN RICE COUNTY IN SOUTH CENTRAL MINNESOTA...
  SCOTT COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHEASTERN SIBLEY COUNTY IN CENTRAL MINNESOTA...

* UNTIL 215 PM CDT

* AT 116 PM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS...
  CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THESE
  STORMS WERE LOCATED ALONG A LINE EXTENDING FROM BELLE PLAINE TO LE
  SUEUR...AND MOVING EAST AT 30 MPH.  PENNY SIZE HAIL MAY ALSO
  ACCOMPANY THESE DAMAGING WINDS.

LOCATIONS IN THE WARNING INCLUDE...
  LE SUEUR...
  BELLE PLAINE...
  JORDAN...
  NEW PRAGUE...
  MONTGOMERY...
  CREDIT RIVER...
  VESELI...
  LONSDALE...
  NEW MARKET...
  LAKEVILLE...
  WEBSTER...
  ELKO...
  FARMINGTON...
  CASTLE ROCK...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4442 9391 4443 9393 4447 9393 4468 9378
      4467 9376 4463 9376 4470 9367 4469 9364
      4470 9362 4469 9309 4439 9331
TIME...MOT...LOC 1818Z 270DEG 27KT 4468 9371 4445 9388
WIND...HAIL 60MPH 0.75IN

$$

1 follow-up statement

863 
WWUS53 KMPX 011846
SVSMPX

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

MNC143-011900-
/O.CAN.KMPX.SV.W.0215.000000T0000Z-110801T1915Z/
SIBLEY MN-
146 PM CDT MON AUG 1 2011

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

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

LAT...LON 4442 9386 4444 9385 4448 9385 4457 9377
      4457 9375 4460 9373 4466 9367 4469 9364
      4470 9362 4469 9309 4439 9331
TIME...MOT...LOC 1845Z 270DEG 27KT 4466 9351 4453 9348
          4441 9355

$$

MNC037-079-131-139-011915-
/O.CON.KMPX.SV.W.0215.000000T0000Z-110801T1915Z/
DAKOTA MN-LE SUEUR MN-RICE MN-SCOTT MN-
146 PM CDT MON AUG 1 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
SCOTT...NORTHWESTERN RICE...NORTHERN LE SUEUR AND SOUTHWESTERN DAKOTA
COUNTIES UNTIL 215 PM CDT...

AT 143 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A LINE OF
SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
MARYSTOWN TO VESELI TO MONTGOMERY...MOVING EAST AT 30 MPH. PENNY SIZE
HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

LOCATIONS IMPACTED INCLUDE...
  VESELI...LONSDALE...WEBSTER...CREDIT RIVER...NEW MARKET...ELKO...
  LAKEVILLE...CASTLE ROCK...FARMINGTON AND CRYSTAL BAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...HAIL...AND DEADLY LIGHTNING. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.

INTENSE SQUALL LINES CAN OCCASSIONALY PRODUCE BRIEF TORNADOES IN
ADDITION TO WIDESPREAD SIGNIFICANT WIND DAMAGE. ALTHOUGH NOT
IMMEDIATELY LIKELY... FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON
THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. 

&&

LAT...LON 4442 9386 4444 9385 4448 9385 4457 9377
      4457 9375 4460 9373 4466 9367 4469 9364
      4470 9362 4469 9309 4439 9331
TIME...MOT...LOC 1845Z 270DEG 27KT 4466 9351 4453 9348
          4441 9355
WIND...HAIL 60MPH 0.75IN

$$

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, 1:25 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Hennepin, Ramsey, Washington	65 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 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.