Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 303, NWS Twin Cities, MN

August 11, 2007Freeborn County, Steele County, Waseca County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 11, 2007, 10:27 PM CDT for Freeborn County, Steele County, Waseca County, Minnesota. It was in force for 63 min. 4 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: Aug 11, 2007, 10:27 PM CDT (03:27 UTC)
Expired: Aug 11, 2007, 11:30 PM CDT
In force: 63 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

Counties Freeborn County, MN, Steele County, MN, Waseca County, MN

The radar

The Minneapolis radar (KMPX), 115 km from the middle of the area, began a volume at 03:27 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
Aug 11, 10:43 PM CDT	TSTM WND GST 58	10 S Owatonna, MN	MEASURED BY MNDOT SENSOR ALONG I-35.
Aug 11, 11:30 PM CDT	TSTM WND GST 64	Albert Lea, MN	MEASURED BY KATE RADIO
Aug 11, 11:34 PM CDT	HAIL 0.88	Albert Lea, MN	REPORTED ON WEST SIDE.
Aug 11, 11:40 PM CDT	TSTM WND DMG	2 Sw Albert Lea, MN	3 TO 6 INCH TREE LIMBS DOWNED.

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
Aug 11, 6:21 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.5 hours before the alert went out and 116 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: 3342 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1149 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.6

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 120327
SVRMPX
MNC047-147-161-120430-
/O.NEW.KMPX.SV.W.0303.070812T0327Z-070812T0430Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1027 PM CDT SAT AUG 11 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WASECA COUNTY IN SOUTH CENTRAL MINNESOTA...
  STEELE COUNTY IN SOUTH CENTRAL MINNESOTA...
  FREEBORN COUNTY IN SOUTH CENTRAL MINNESOTA...

* UNTIL 1130 PM CDT

* AT 1022 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES NORTH OF NEW
  RICHLAND...OR ABOUT 7 MILES SOUTH OF WASECA...AND MOVING SOUTH AT
  40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  NEW RICHLAND...
  ELLENDALE...
  GENEVA...
  BLOOMING PRAIRIE...
  CLARKS GROVE...
  ALDEN...
  ALBERT LEA...
  GLENVILLE...

STAY INDOORS...AND AWAY FROM WINDOWS.

LAT...LON 4404 9305 4399 9377 4385 9366 4351 9365
      4351 9306 4385 9306

$$

1 follow-up statement

000 
WWUS53 KMPX 120410
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1110 PM CDT SAT AUG 11 2007

MNC147-161-120420-
/O.CAN.KMPX.SV.W.0303.000000T0000Z-070812T0430Z/
WASECA MN-STEELE MN-
1110 PM CDT SAT AUG 11 2007

...THE SEVERE THUNDERSTORM WARNING FOR STEELE AND WASECA COUNTIES IS
CANCELLED...

THE STORMS THAT PROMPTED THE WARNING HAVE MOVED SOUTH OF STEELE AND 
WASECA COUNTIES...SO THE WARNINGS HAVE BEEN CANCELED. PRIOR TO 
MOVING OUT OF THE COUNTIES...HAIL TO THE SIZE OF QUARTERS...AND 
WIDESPREAD WIND DAMAGE WAS REPORTED.

LAT...LON 4383 9308 4385 9363 4364 9362 4351 9365
      4351 9306 4385 9306

$$

MNC047-120430-
/O.CON.KMPX.SV.W.0303.000000T0000Z-070812T0430Z/
FREEBORN MN-
1110 PM CDT SAT AUG 11 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT
FOR FREEBORN COUNTY...

AT 1109 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
THUNDERSTORM...CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 3 MILES NORTHWEST
OF CLARKS GROVE...OR ABOUT OVER CLARKS GROVE...AND MOVING SOUTH AT 40
MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE MANSFIELD...LONDON...TWIN
LAKES...MYRTLE...MANCHESTER...HOLLANDALE...HAYWARD...HARTLAND...
GLENVILLE AND GENEVA.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

LAT...LON 4383 9308 4385 9363 4364 9362 4351 9365
      4351 9306 4385 9306

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 7:02 PM CDT	Severe Thunderstorm Warning	MPX	Ramsey, Washington	58 min
Aug 11, 7:41 PM CDT	Severe Thunderstorm Warning	MPX	Carver, McLeod	64 min
Aug 11, 7:55 PM CDT	Severe Thunderstorm Warning	MPX	Washington	65 min
Aug 11, 7:57 PM CDT	Severe Thunderstorm Warning	MPX	Scott	63 min
Aug 11, 8:01 PM CDT	Severe Thunderstorm Warning	MPX	Dakota	59 min
Aug 11, 8:16 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Rice	59 min
Aug 11, 8:26 PM CDT	Severe Thunderstorm Warning	MPX	Chisago, Isanti	64 min
Aug 11, 8:32 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	58 min
Aug 11, 8:43 PM CDT	Severe Thunderstorm Warning	MPX	Nicollet	62 min
Aug 11, 8:58 PM CDT	Severe Thunderstorm Warning	MPX	Dakota	32 min
Aug 11, 9:13 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Rice	47 min
Aug 11, 9:36 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Steele, Waseca	54 min
Aug 11, 11:31 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn	27 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2007 Every severe thunderstorm warning in 2007

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.