Alert archive / Minnesota / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 21, NWS Twin Cities, MN

June 18, 2009Benton County, Mille Lacs County, Morrison County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jun 18, 2009, 6:04 PM CDT for Benton County, Mille Lacs County, Morrison County, Minnesota. It was in force for 56 min. 2 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: Jun 18, 2009, 6:04 PM CDT (23:04 UTC)
Expired: Jun 18, 2009, 7:00 PM CDT
In force: 56 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon

Counties Benton County, MN, Mille Lacs County, MN, Morrison County, MN

The radar

The Minneapolis radar (KMPX), 108 km from the middle of the area, began a volume at 23:04 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
Jun 18, 6:07 PM CDT	HAIL 1	5 N Gilman, MN
Jun 18, 6:30 PM CDT	HAIL 1.25	6 Nnw Milaca, MN	LASTED ABOUT TEN MINUTES. GROUND WHITE.

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
Jun 18, 1:50 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 18, 3:12 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.1 hours before the alert went out and 108 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: 1400 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 669 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 165 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 182304
SVRMPX
MNC009-095-097-190000-
/O.NEW.KMPX.SV.W.0021.090618T2304Z-090619T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
604 PM CDT THU JUN 18 2009

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN MORRISON COUNTY IN CENTRAL MINNESOTA...  
  MILLE LACS COUNTY IN EAST CENTRAL MINNESOTA...  
  NORTHEASTERN BENTON COUNTY IN CENTRAL MINNESOTA...

* UNTIL 700 PM CDT

* AT 601 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND DAMAGING
  WINDS IN EXCESS OF 65 MPH. THIS STORM WAS LOCATED 4 MILES NORTH OF
  GILMAN...OR ABOUT 14 MILES WEST OF MILACA...AND MOVING EAST AT 25
  MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  RUM RIVER...
  FORESTON...
  MILACA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS
ARE ALSO EXPECTED...WHICH WILL UPROOT TREES AND DOWN POWER LINES.
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT THURSDAY EVENING
FOR SOUTHERN MINNESOTA.

&&

LAT...LON 4587 9352 4586 9351 4570 9351 4570 9352
      4571 9396 4590 9396 4595 9352
TIME...MOT...LOC 2303Z 264DEG 23KT 4580 9393

$$

TRH

2 follow-up statements

000 
WWUS53 KMPX 182335
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
635 PM CDT THU JUN 18 2009

MNC009-097-182345-
/O.CAN.KMPX.SV.W.0021.000000T0000Z-090619T0000Z/
MORRISON MN-BENTON MN-
635 PM CDT THU JUN 18 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BENTON AND
SOUTHEASTERN MORRISON COUNTIES IS CANCELLED...

RADAR INDICATED THAT THE SEVERE STORM HAD MOVED OUT OF THE WARNED 
AREA. THEREFORE...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT THURSDAY EVENING 
FOR SOUTHERN MINNESOTA. 

LAT...LON 4594 9352 4574 9351 4573 9376 4592 9376
      4595 9353
TIME...MOT...LOC 2335Z 264DEG 23KT 4583 9360

$$

MNC095-190000-
/O.CON.KMPX.SV.W.0021.000000T0000Z-090619T0000Z/
MILLE LACS MN-
635 PM CDT THU JUN 18 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT 
FOR MILLE LACS COUNTY...

AT 633 PM CDT...RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM...
CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND
DAMAGING WINDS IN EXCESS OF 65 MPH. THE SEVERE STORM WAS LOCATED 5
MILES NORTHWEST OF BOCK...OR ABOUT 8 MILES NORTHEAST OF FORESTON...
AND MOVING EAST AT 25 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE....

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS
ARE ALSO EXPECTED...WHICH WILL UPROOT TREES AND DOWN POWER LINES.
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

REPORT ANY DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY...FOR RELAY
TO THE NATIONAL WEATHER SERVICE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT THURSDAY EVENING
FOR SOUTHERN MINNESOTA.

&&

LAT...LON 4594 9352 4574 9351 4573 9376 4592 9376
      4595 9353
TIME...MOT...LOC 2335Z 264DEG 23KT 4583 9360

$$

TRH

000 
WWUS53 KMPX 182353
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
653 PM CDT THU JUN 18 2009

MNC095-190000-
/O.CON.KMPX.SV.W.0021.000000T0000Z-090619T0000Z/
MILLE LACS MN-
653 PM CDT THU JUN 18 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT 
FOR MILLE LACS COUNTY...

AT 651 PM CDT...RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM...
CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
OF 60 MPH. THE SEVERE STORM WAS LOCATED OVER CENTRAL MILLE LACS
COUNTY...OR ABOUT 6 MILES WEST OF OGILVIE...AND MOVING EAST AT 25
MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE....

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

REPORT ANY DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY...FOR RELAY
TO THE NATIONAL WEATHER SERVICE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT THURSDAY EVENING
FOR SOUTHERN MINNESOTA.

&&

LAT...LON 4578 9363 4594 9362 4595 9353 4594 9353
      4579 9351
TIME...MOT...LOC 2353Z 264DEG 23KT 4584 9353

$$

TRH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 7:12 PM CDT	Tornado Warning	MPX	Blue Earth, Faribault, Martin, Waseca, Watonwan	33 min
Jun 17, 7:14 PM CDT	Tornado Warning	MPX	Le Sueur, Rice	31 min
Jun 17, 7:16 PM CDT	Tornado Warning	MPX	Freeborn, Steele	44 min
Jun 17, 7:49 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Rice, Steele, Waseca	56 min
Jun 17, 8:04 PM CDT	Tornado Warning	MPX	Rice, Steele, Waseca	26 min
Jun 17, 8:24 PM CDT	Tornado Warning	MPX	Steele	33 min
Jun 17, 9:22 PM CDT	Special Weather Statement	MPX	Goodhue	113 min
Jun 17, 9:53 PM CDT	Special Weather Statement	MPX	Chisago, Dakota, Goodhue, Ramsey, Washington	97 min
Jun 17, 10:48 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue, Washington	42 min
Jun 17, 11:08 PM CDT	Special Weather Statement	MPX	Dakota	52 min
Jun 17, 11:20 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	40 min
Jun 18, 12:55 PM CDT	Severe Thunderstorm Warning	MPX	Douglas	50 min
Jun 18, 1:50 PM CDT	Severe Thunderstorm Warning	MPX	Douglas	55 min
Jun 18, 2:27 PM CDT	Tornado Warning	MPX	Douglas	48 min
Jun 18, 2:37 PM CDT	Severe Thunderstorm Warning	MPX	Douglas, Todd	53 min
Jun 18, 2:54 PM CDT	Tornado Warning	MPX	Todd	51 min
Jun 18, 3:33 PM CDT	Special Weather Statement	MPX	Stearns	57 min
Jun 18, 3:41 PM CDT	Severe Thunderstorm Warning	MPX	Stearns	64 min
Jun 18, 3:48 PM CDT	Special Weather Statement	MPX	Todd	57 min
Jun 18, 4:16 PM CDT	Special Weather Statement	MPX	Morrison	59 min
Jun 18, 4:47 PM CDT	Severe Thunderstorm Warning	MPX	Morrison, Stearns	43 min
Jun 18, 5:13 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Morrison, Stearns	62 min
Jun 18, 6:32 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec	58 min
Jun 18, 6:44 PM CDT	Severe Thunderstorm Warning	MPX	Stevens	61 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2009 Every severe thunderstorm warning in 2009

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.