Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 103, NWS Twin Cities, MN

July 1, 2011Martin County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 1, 2011, 6:42 PM CDT for Martin County, Minnesota. It was in force for 33 min. 1 report 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, 6:42 PM CDT (23:42 UTC)
Expired: Jul 1, 2011, 7:15 PM CDT
In force: 33 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.25 in
Wind: 65.0 mph

County Martin County, MN

The radar

The Sioux Falls radar (KFSD), 157 km from the middle of the area, began a volume at 23:42 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, 6:52 PM CDT	TSTM WND DMG	N Sherburn, MN	24 INCH TREE DOWN AT 261ST STREET AND CTY 5

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 12:00Z, 11.7 hours before the alert went out and 165 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: 3970 J/kg
Mixed-layer CIN: -245 J/kg
Mixed-layer LCL: 1089 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.7

Open this sounding in Storm Lab

The text

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

984 
WUUS53 KMPX 012342 RRA
SVRMPX
MNC091-020015-
/O.NEW.KMPX.SV.W.0103.110701T2342Z-110702T0015Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN AND NORTHERN MARTIN COUNTY IN SOUTH CENTRAL MINNESOTA...

* UNTIL 715 PM CDT

* AT 640 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING HALF DOLLAR SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 65
  MPH. THIS STORM WAS LOCATED 6 MILES WEST OF DUNNELL...OR ABOUT 6
  MILES SOUTHEAST OF JACKSON...AND MOVING NORTHEAST AT 45 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  DUNNELL...
  SHERBURN...
  WELCOME...
  TRIMONT...
  TRUMAN...

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 4355 9486 4356 9487 4357 9486 4375 9485
      4384 9476 4384 9437 4351 9469 4350 9486
TIME...MOT...LOC 2341Z 223DEG 40KT 4357 9488
WIND...HAIL 65MPH 1.25IN

$$

TDK

1 follow-up statement

884 
WWUS53 KMPX 020011
SVSMPX

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

MNC091-020025-
/O.EXP.KMPX.SV.W.0103.000000T0000Z-110702T0015Z/
MARTIN MN-
711 PM CDT FRI JUL 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN AND NORTHERN MARTIN 
COUNTY WILL EXPIRE AT 715 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY...HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH
THIS THUNDERSTORM.

THE STORM DID HAVE STRONG WINDS THAT CAUSED A LARGE BRANCH TO COME 
DOWN AND BLOCK HIGHWAY 15 ABOUT 1.5 MILES NORTH OF TRUMAN. BUT THE 
STORMS HAVE WEAKENED BELOW SEVERE LEVELS. WINDS OF 40 OR 50 MPH ARE 
STILL POSSIBLE.

LAT...LON 4355 9486 4356 9487 4357 9486 4375 9485
      4384 9476 4384 9437 4351 9469 4350 9486
TIME...MOT...LOC 0010Z 230DEG 45KT 4380 9450

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 4:05 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Redwood, Renville, Yellow Medicine	55 min
Jul 1, 4:31 PM CDT	Severe Thunderstorm Warning	MPX	Meeker, Wright	59 min
Jul 1, 4:37 PM CDT	Tornado Warning	MPX	Redwood, Renville	23 min
Jul 1, 4:53 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Redwood, Renville, Sibley	67 min
Jul 1, 4:57 PM CDT	Tornado Warning	MPX	Redwood, Renville	33 min
Jul 1, 4:59 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Morrison, Stearns	61 min
Jul 1, 5:13 PM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, McLeod, Meeker, Renville, Sibley, Stearns and 1 more	62 min
Jul 1, 5:27 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Isanti, Sherburne, Wright	48 min
Jul 1, 5:38 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Kanabec, Mille Lacs, Morrison	67 min
Jul 1, 5:52 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Benton, Hennepin, Isanti, Meeker, Mille Lacs and 3 more	53 min
Jul 1, 6:02 PM CDT	Special Weather Statement	MPX	Carver, Hennepin, Scott	43 min
Jul 1, 6:16 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Morrison, Stearns	29 min
Jul 1, 6:20 PM CDT	Tornado Warning	MPX	Benton, Sherburne, Stearns	25 min
Jul 1, 6:27 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Chisago, Isanti, Kanabec, Mille Lacs	63 min
Jul 1, 6:42 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Benton, Chisago, Hennepin, Isanti, Kanabec and 5 more	63 min
Jul 1, 6:56 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Nicollet	34 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.