Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 94, NWS Twin Cities, MN

July 1, 20115 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 1, 2011, 4:53 PM CDT for 5 counties in Minnesota. It was in force for 67 min. 21 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, 4:53 PM CDT (21:53 UTC)
Expired: Jul 1, 2011, 6:00 PM CDT
In force: 67 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 75.0 mph

Counties Chippewa County, MN, Kandiyohi County, MN, Redwood County, MN, Renville County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 103 km from the middle of the area, began a volume at 21:55 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, 4:56 PM CDT	TSTM WND GST 62	Redwood Falls, MN	MEASURED AT REDWOOD VALLEY HIGH SCHOOL
Jul 1, 4:57 PM CDT	TSTM WND DMG	Redwood Falls, MN	5 INCH DIAMETER BRANCHES DOWN
Jul 1, 4:57 PM CDT	HAIL 0.75	Redwood Falls, MN
Jul 1, 4:58 PM CDT	TSTM WND GST 78	Redwood Falls, MN	MEASURED WITH CAR ANEMOMETER.
Jul 1, 5:00 PM CDT	TSTM WND DMG	1 N Danube, MN	3 POWER POLES DOWN. TOP PART OF AN 80 FOOT TREE ROUGHLY 2.5 FEET IN DIAMETER TAKEN OFF. REPORT FROM SPOTTER A-20.
Jul 1, 5:00 PM CDT	TSTM WND DMG	Danube, MN	PATH OF DAMAGE NEAR COUNTY ROAD 11...INCLUDING AT LEAST 4 BARNS...HOUSE...SCHOOL HOUSE...SILO...AND DOWNED TREES. TIME ESTIMATED.
Jul 1, 5:00 PM CDT	TSTM WND DMG	Renville, MN	RIPPED METAL SHEETS OFF BUILDING EXTERIOR.
Jul 1, 5:00 PM CDT	HAIL 1.25	Redwood Falls, MN
Jul 1, 5:03 PM CDT	TORNADO	1 Nw Danube, MN	TORNADO RATED EF-1. TOUCHED DOWN ABOUT 1/2 MILE NORTHWEST OF DANUBE AND MOVED NORTH-NORTHEAST. IT DISSIPATED 3 N DANUBE. PATH LENGTH 2.5 MILES AND MAXIMUM WIDTH 300 YARDS. A HOUSE HAD MUCH OF ITS ROOF LIFTED OFF AND A LARGE EQUIPMENT SHED WAS NEARLY COMPLETELY
Jul 1, 5:04 PM CDT	HAIL 1	Renville, MN	ESTIMATED TIME
Jul 1, 5:07 PM CDT	FUNNEL CLOUD	Franklin, MN
Jul 1, 5:08 PM CDT	TSTM WND DMG	1 N Danube, MN	THREE POWER LINES DOWN.
Jul 1, 5:10 PM CDT	HAIL 0.88	1 N Danube, MN	REPORT FROM SPOTTER A-20. DIME TO NICKEL SIZE HAIL.
Jul 1, 5:11 PM CDT	TSTM WND GST 63	Redwood Falls, MN	MEASURED FROM THE REDWOOD FALLS AIRPORT
Jul 1, 5:17 PM CDT	TSTM WND DMG	Redwood Falls, MN	NUMEROUS TREES DOWN...SOME AS WIDE AS 2.5 FEET. SEVERAL POWER LINES DOWN...SOME ROOF DAMAGE. ALL REPORTED IN DOWNTOWN AREA.
Jul 1, 5:25 PM CDT	TSTM WND DMG	2 Ne Hector, MN	TWO FOOT TREES DOWN.
Jul 1, 5:25 PM CDT	TSTM WND DMG	2 Ne Renville, MN	TWO FOOT TREES DOWN.
Jul 1, 5:30 PM CDT	TSTM WND DMG	Olivia, MN	ONE FOOT DIAMETER TREES DOWN ALONG WITH POWER LINES.
Jul 1, 5:30 PM CDT	HAIL 1	Olivia, MN
Jul 1, 5:45 PM CDT	TSTM WND DMG	Sacred Heart, MN	NUMEROUS TREES DOWNED OR UPROOTED ON HIGHWAY 212. TWO BUSINESSES HAVE PORTIONS OF ROOFS OFF. ONE BUSINESS HAD WALL BLOWN IN.
Jul 1, 5:52 PM CDT	TSTM WND DMG	2 Nw Olivia, MN	OUT BUILDINGS FLATTENED, TREES UPROOTED, GRAIN BINS BLOWN OVER.

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, 9.9 hours before the alert went out and 100 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.

334 
WUUS53 KMPX 012153
SVRMPX
MNC023-067-127-129-143-012300-
/O.NEW.KMPX.SV.W.0094.110701T2153Z-110701T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
453 PM CDT FRI JUL 1 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN CHIPPEWA COUNTY IN WEST CENTRAL MINNESOTA...
  SOUTHERN KANDIYOHI COUNTY IN CENTRAL MINNESOTA...
  NORTHEASTERN REDWOOD COUNTY IN SOUTHWEST MINNESOTA...
  RENVILLE COUNTY IN CENTRAL MINNESOTA...
  NORTHWESTERN SIBLEY COUNTY IN CENTRAL MINNESOTA...

* UNTIL 600 PM CDT

* AT 450 PM CDT...TRAINED SPOTTERS REPORTED A LINE OF SEVERE
  THUNDERSTORMS WITH QUARTER SIZE HAIL AND DESTRUCTIVE WINDS IN
  EXCESS OF 75 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM MINNESOTA FALLS TO BECHYN TO CLEMENTS...AND MOVING NORTHEAST
  AT 55 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  REDWOOD FALLS...
  OLIVIA...
  NORTH REDWOOD...
  SACRED HEART...
  MINNESOTA FALLS...
  RENVILLE...
  BECHYN...
  DANUBE...
  MORTON...
  PRINSBURG...
  FRANKLIN...
  BIRD ISLAND...
  BLOMKEST...
  SVEA...

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.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

&&

LAT...LON 4483 9550 4520 9488 4504 9476 4489 9476
      4489 9465 4469 9449 4463 9449 4463 9445
      4456 9439 4448 9482 4450 9486 4447 9487
      4441 9518 4459 9525
TIME...MOT...LOC 2153Z 242DEG 50KT 4487 9532 4466 9508
          4443 9507
WIND...HAIL 75MPH 1.00IN

$$

JLT

1 follow-up statement

833 
WWUS53 KMPX 012209
SVSMPX

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

MNC023-127-012223-
/O.CAN.KMPX.SV.W.0094.000000T0000Z-110701T2300Z/
CHIPPEWA MN-REDWOOD MN-
509 PM CDT FRI JUL 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN REDWOOD COUNTY IN
SOUTHWEST MINNESOTA...AND SOUTHEASTERN CHIPPEWA COUNTY IN WEST
CENTRAL MINNESOTA IS CANCELLED...

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

LAT...LON 4520 9488 4504 9476 4489 9476 4489 9465
      4469 9449 4463 9449 4463 9445 4456 9440
      4448 9482 4460 9513 4465 9523 4480 9530
TIME...MOT...LOC 2208Z 242DEG 50KT 4497 9506 4476 9482
          4453 9481

$$

MNC067-129-143-012300-
/O.CON.KMPX.SV.W.0094.000000T0000Z-110701T2300Z/
KANDIYOHI MN-RENVILLE MN-SIBLEY MN-
509 PM CDT FRI JUL 1 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
SIBLEY...RENVILLE AND SOUTHEASTERN KANDIYOHI COUNTIES UNTIL 600 PM
CDT...

AT 504 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A LINE OF SEVERE
THUNDERSTORMS PRODUCING QUARTER SIZE HAIL...AND DESTRUCTIVE WINDS IN
EXCESS OF 75 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM PRINSBURG TO BIRD ISLAND TO FRANKLIN...MOVING NORTHEAST AT 55
MPH.

LOCATIONS IMPACTED INCLUDE...
  BLOMKEST...FAIRFAX...SVEA...HECTOR...LAKE LILLIAN...THORPE...
  BUFFALO LAKE AND KANDIYOHI.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS AN EXTREMELY 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.

THIS STORM HAS A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE ACROSS 
PORTIONS OF SOUTHWEST MINNESOTA. SEEK SHELTER NOW INSIDE A STURDY 
STRUCTURE AND STAY AWAY FROM WINDOWS!

&&

LAT...LON 4520 9488 4504 9476 4489 9476 4489 9465
      4469 9449 4463 9449 4463 9445 4456 9440
      4448 9482 4460 9513 4465 9523 4480 9530
TIME...MOT...LOC 2208Z 242DEG 50KT 4497 9506 4476 9482
          4453 9481
WIND...HAIL 75MPH 1.00IN

$$

JLT

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, 4:57 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, 6:42 PM CDT	Severe Thunderstorm Warning	MPX	Martin	33 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.