Alert archive / Minnesota / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 240, NWS Twin Cities, MN

July 29, 2008Benton County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 29, 2008, 2:32 AM CDT for Benton County, Minnesota. It was in force for 43 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 29, 2008, 2:32 AM CDT (07:32 UTC)
Expired: Jul 29, 2008, 3:15 AM CDT
In force: 43 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon

County Benton County, MN

The radar

The Minneapolis radar (KMPX), 100 km from the middle of the area, began a volume at 07:35 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 29, 2:39 AM CDT	TSTM WND GST 59	Rice, MN	ON US-10 MILE POST 162

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 29, 12:56 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 7.5 hours before the alert went out and 99 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: 1538 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 1238 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 290732
SVRMPX
MNC009-290815-
/O.NEW.KMPX.SV.W.0240.080729T0732Z-080729T0815Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
232 AM CDT TUE JUL 29 2008

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BENTON COUNTY IN CENTRAL MINNESOTA...

* UNTIL 315 AM CDT

* AT 230 AM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS...
  CAPABLE OF PRODUCING PENNY SIZE HAIL AND DAMAGING WINDS IN EXCESS
  OF 65 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 6
  MILES WEST OF RICE TO 13 MILES SOUTHWEST OF SAUK RAPIDS...AND
  MOVING EAST AT 39 MPH.

* SOME LOCATIONS INCLUDE...
  RICE...
  SARTELL...
  SAUK RAPIDS...
  MAYHEW...
  LITTLE ROCK...
  DUELM...
  GILMAN...
  FOLEY...
  RONNEBY...
  RUM RIVER...
  GLENDORADO...

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 SIGNIFICANT WIND OR HAIL DAMAGE TO THE NEAREST LAW
ENFORCEMENT AGENCY...FOR RELAY TO THE NATIONAL WEATHER SERVICE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 AM CDT
TUESDAY MORNING FOR CENTRAL MINNESOTA.

LAT...LON 4556 9416 4560 9417 4562 9421 4568 9419
      4572 9421 4582 9435 4582 9383 4581 9377
      4556 9376
TIME...MOT...LOC 0732Z 270DEG 34KT 4575 9432 4542 9425

$$

2 follow-up statements

000 
WWUS53 KMPX 290749
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
249 AM CDT TUE JUL 29 2008

MNC009-290815-
/O.CON.KMPX.SV.W.0240.000000T0000Z-080729T0815Z/
BENTON MN-
248 AM CDT TUE JUL 29 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 AM CDT
FOR BENTON COUNTY...

AT 244 AM CDT...RADAR CONTINUED TO INDICATE A LINE OF SEVERE
THUNDERSTORMS...CAPABLE OF PRODUCING PENNY SIZE HAIL AND DAMAGING
WINDS IN EXCESS OF 65 MPH.  THESE SEVERE STORMS WERE LOCATED ALONG A
LINE EXTENDING FROM 4 MILES NORTHWEST OF RICE TO 3 MILES SOUTHEAST OF
SAUK RAPIDS...AND MOVING EAST AT 39 MPH. AT 239 AM CDT...A WIND GUST 
TO 59 MPH WAS OBSERVED IN RICE.

OTHER LOCATIONS IN THE WARNING INCLUDE RUM RIVER...PARENT...MAYHEW...
GLENDORADO...DUELM...SAUK RAPIDS...SARTELL...RONNEBY...RICE AND
GILMAN.

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 SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 AM CDT
TUESDAY MORNING FOR CENTRAL MINNESOTA.

LAT...LON 4556 9416 4560 9417 4562 9421 4568 9419
      4572 9421 4582 9435 4582 9383 4581 9377
      4556 9376
TIME...MOT...LOC 0748Z 270DEG 34KT 4579 9423 4556 9405

$$

000 
WWUS53 KMPX 290813
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
313 AM CDT TUE JUL 29 2008

MNC009-290822-
/O.EXP.KMPX.SV.W.0240.000000T0000Z-080729T0815Z/
BENTON MN-
312 AM CDT TUE JUL 29 2008

...THE SEVERE THUNDERSTORM WARNING FOR BENTON COUNTY EXPIRES AT 315
AM CDT...

AT 312 AM CDT...RADAR INDICATED SEVERE STORMS WERE WEAKENING AS THEY 
MOVED OUT OF THE COUNTY. HOWEVER...MORE THUNDERSTORMS WERE 
DEVELOPING IN THE AREA...REMAIN ALERT FOR ADDITIONAL WARNINGS.

AT 239 AM CDT...A WIND GUST TO 59 MPH WAS OBSERVED IN RICE WITH THE 
STORM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 AM CDT 
TUESDAY MORNING FOR CENTRAL MINNESOTA. A SEVERE THUNDERSTORM WATCH 
ALSO REMAINS IN EFFECT UNTIL 800 AM CDT TUESDAY MORNING FOR EAST 
CENTRAL MINNESOTA AND NORTHWEST WISCONSIN.

LAT...LON 4556 9416 4560 9417 4562 9421 4568 9419
      4572 9421 4582 9435 4582 9383 4581 9377
      4556 9376
TIME...MOT...LOC 0812Z 270DEG 34KT 4579 9390 4556 9373

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 12:12 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle, Swift	63 min
Jul 29, 1:13 AM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Pope, Swift	47 min
Jul 29, 2:08 AM CDT	Severe Thunderstorm Warning	MPX	Stearns	52 min
Jul 29, 2:21 AM CDT	Severe Thunderstorm Warning	MPX	Morrison	54 min
Jul 29, 2:59 AM CDT	High Wind Warning	MPX	Douglas, Pope, Stearns, Stevens, Todd	2 hr

Nearby

Severe Thunderstorm Warnings in Minnesota, 2008 Every severe thunderstorm warning in 2008

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.