Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 45, NWS Twin Cities, MN

May 21, 20115 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 21, 2011, 10:43 PM CDT for 5 counties in Minnesota. It was in force for 47 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: May 21, 2011, 10:43 PM CDT (03:43 UTC)
Expired: May 21, 2011, 11:30 PM CDT
In force: 47 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Chippewa County, MN, Pope County, MN, Renville County, MN, Stevens County, MN, Swift County, MN

The radar

The Minneapolis radar (KMPX), 186 km from the middle of the area, began a volume at 03:44 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.7 hours before the alert went out and 183 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: 1091 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 922 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 348 m²/s²
0-3 km storm-relative helicity: 424 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 12.8

Open this sounding in Storm Lab

The text

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

053 
WUUS53 KMPX 220343 RRA
SVRMPX
MNC023-121-129-149-151-220430-
/O.NEW.KMPX.SV.W.0045.110522T0343Z-110522T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1043 PM CDT SAT MAY 21 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CHIPPEWA COUNTY IN WEST CENTRAL MINNESOTA...
  POPE COUNTY IN WEST CENTRAL MINNESOTA...
  NORTHWESTERN RENVILLE COUNTY IN CENTRAL MINNESOTA...
  STEVENS COUNTY IN WEST CENTRAL MINNESOTA...
  SWIFT COUNTY IN WEST CENTRAL MINNESOTA...

* UNTIL 1130 PM CDT

* AT 1039 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 ODESSA TO
  MONTEVIDEO TO BECHYN...AND MOVING NORTH AT 60 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  BENSON...
  MORRIS...
  GLENWOOD...
  APPLETON...
  GLUEK...
  BIG BEND CITY...
  CLARA CITY...
  HOLLOWAY...
  DANVERS...
  CHOKIO...
  DE GRAFF...
  KERKHOVEN...
  CLONTARF...
  ALBERTA...

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.

THESE STORMS HAVE A HISTORY OF PRODUCING DAMAGING WINDS. SEEK 
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

&&

LAT...LON 4573 9626 4574 9625 4572 9526 4466 9523
      4466 9527 4488 9564 4491 9571 4518 9612
      4540 9614 4541 9625
TIME...MOT...LOC 0343Z 181DEG 53KT 4528 9626 4503 9571
          4474 9512
WIND...HAIL 60MPH <.75IN

$$

1 follow-up statement

541 
WWUS53 KMPX 220415
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1115 PM CDT SAT MAY 21 2011

MNC023-129-220430-
/O.CAN.KMPX.SV.W.0045.000000T0000Z-110522T0430Z/
CHIPPEWA MN-RENVILLE MN-
1115 PM CDT SAT MAY 21 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN RENVILLE COUNTY
IN CENTRAL MINNESOTA...AND CHIPPEWA COUNTY IN WEST CENTRAL MINNESOTA
IS CANCELLED...

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

LAT...LON 4574 9625 4572 9526 4541 9525 4537 9527
      4516 9525 4515 9529 4517 9542 4521 9560
      4540 9614 4541 9625 4573 9626
TIME...MOT...LOC 0415Z 181DEG 53KT 4575 9625 4550 9570
          4521 9510

$$

MNC121-149-151-220430-
/O.CON.KMPX.SV.W.0045.000000T0000Z-110522T0430Z/
POPE MN-STEVENS MN-SWIFT MN-
1115 PM CDT SAT MAY 21 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
SWIFT...STEVENS AND POPE COUNTIES UNTIL 1130 PM CDT...

AT 1112 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 9
MILES NORTHEAST OF COLLIS TO 5 MILES SOUTHEAST OF HANCOCK TO
WILLMAR...MOVING NORTH AT 60 MPH.

LOCATIONS IMPACTED INCLUDE...
  GLENWOOD...DONNELLY...CYRUS...STARBUCK...LONG BEACH...LOWRY...SWIFT
  FALLS...GILCHRIST AND VILLARD.

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.

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS!

&&

LAT...LON 4574 9625 4572 9526 4541 9525 4537 9527
      4516 9525 4515 9529 4517 9542 4521 9560
      4540 9614 4541 9625 4573 9626
TIME...MOT...LOC 0415Z 181DEG 53KT 4575 9625 4550 9570
          4521 9510
WIND...HAIL 60MPH <.75IN

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 7:00 PM CDT	Tornado Warning	MPX	Anoka, Hennepin	45 min
May 21, 7:24 PM CDT	Severe Thunderstorm Warning	MPX	Hennepin, Wright	51 min
May 21, 7:25 PM CDT	Tornado Warning	MPX	Anoka	35 min
May 21, 7:46 PM CDT	Special Weather Statement	MPX	Pope	44 min
May 21, 8:00 PM CDT	Areal Flood Advisory	MPX	Anoka, Hennepin, Wright	3 hr
May 21, 8:06 PM CDT	Severe Thunderstorm Warning	MPX	Martin	39 min
May 21, 8:44 PM CDT	Severe Thunderstorm Warning	MPX	Martin	61 min
May 21, 8:59 PM CDT	Special Weather Statement	MPX	Todd	61 min
May 21, 9:11 PM CDT	Severe Thunderstorm Warning	MPX	Todd	64 min
May 21, 9:25 PM CDT	Severe Thunderstorm Warning	MPX	Watonwan	50 min
May 21, 9:42 PM CDT	Severe Thunderstorm Warning	MPX	Redwood	48 min
May 21, 10:12 PM CDT	Special Weather Statement	MPX	Yellow Medicine	48 min
May 21, 10:26 PM CDT	Special Weather Statement	MPX	Redwood	34 min
May 21, 10:43 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Martin, Redwood, Watonwan	62 min
May 22, 12:46 AM CDT	Special Weather Statement	MPX	Le Sueur, Rice, Steele, Waseca	44 min
May 22, 10:57 AM CDT	Special Weather Statement	MPX	Dakota, Goodhue, Rice	48 min
May 22, 11:02 AM CDT	Special Weather Statement	MPX	Anoka, Hennepin, Ramsey	43 min
May 22, 12:38 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Rice, Steele, Waseca	52 min
May 22, 12:53 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Le Sueur, Scott	52 min
May 22, 1:23 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue, Rice, Steele	67 min
May 22, 1:35 PM CDT	Special Weather Statement	MPX	Hennepin	40 min
May 22, 2:05 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	40 min
May 22, 2:10 PM CDT	Tornado Warning	MPX	Anoka, Hennepin, Ramsey	35 min
May 22, 2:24 PM CDT	Tornado Warning	MPX	Anoka, Hennepin, Ramsey	36 min
May 22, 2:45 PM CDT	Tornado Warning	MPX	Anoka, Ramsey, Washington	30 min
May 22, 3:10 PM CDT	Tornado Warning	MPX	Chisago, Washington	35 min
May 22, 3:34 PM CDT	Tornado Warning	MPX	Chisago	41 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.