Alert archive / Minnesota / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 79, NWS Twin Cities, MN

May 31, 2008Anoka County, Chisago County, Washington County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 31, 2008, 6:45 PM CDT for Anoka County, Chisago County, Washington County, Minnesota. It was in force for 45 min. 3 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: May 31, 2008, 6:45 PM CDT (23:45 UTC)
Expired: May 31, 2008, 7:30 PM CDT
In force: 45 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon

Counties Anoka County, MN, Chisago County, MN, Washington County, MN

The radar

The Minneapolis radar (KMPX), 67 km from the middle of the area, began a volume at 23:47 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
May 31, 6:47 PM CDT	HAIL 1.75	East Bethel, MN
May 31, 7:12 PM CDT	HAIL 0.88	1 Ese Forest Lake, MN
May 31, 7:12 PM CDT	HAIL 1	Forest Lake, MN	NEAR HIGHWAYS 61 AND 97.

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
May 31, 2:51 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.8 hours before the alert went out and 69 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: 16 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 722 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 7 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 312345
SVRMPX
MNC003-025-163-010030-
/O.NEW.KMPX.SV.W.0079.080531T2345Z-080601T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
645 PM CDT SAT MAY 31 2008

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWEST CHISAGO COUNTY IN EAST CENTRAL MINNESOTA...              
  NORTHEASTERN ANOKA COUNTY IN EAST CENTRAL MINNESOTA...  
  NORTHERN WASHINGTON COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 730 PM CDT

* AT 642 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING PENNY SIZE HAIL AND DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES NORTH OF EAST BETHEL...
  OR ABOUT 6 MILES SOUTHEAST OF ISANTI...AND MOVING SOUTHEAST AT 30
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  EAST BETHEL...
  WYOMING...
  CHISAGO CITY...
  FOREST LAKE...
  STACY...

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.

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 4523 9276 4520 9310 4540 9346 4541 9344
      4541 9304 4543 9303 4543 9293
TIME...MOT...LOC 2345Z 315DEG 28KT 4541 9315

$$

1 follow-up statement

000 
WWUS53 KMPX 312353
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
652 PM CDT SAT MAY 31 2008

MNC003-025-163-010030-
/O.CON.KMPX.SV.W.0079.000000T0000Z-080601T0030Z/
CHISAGO MN-ANOKA MN-WASHINGTON MN-
652 PM CDT SAT MAY 31 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR NORTHERN WASHINGTON...NORTHEASTERN ANOKA AND SOUTH CENTRAL
CHISAGO COUNTIES...

AT 647 PM CDT...GOLF BALL SIZE HAIL WAS REPORTED IN EAST BETHEL WITH 
THIS STORM.

AT 651 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
THUNDERSTORM...CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP TO GOLF
BALL SIZE AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS SEVERE
THUNDERSTORM WAS LOCATED 5 MILES NORTHEAST OF EAST BETHEL...AND
MOVING SOUTHEAST AT 32 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE SCANDIA...WYOMING...STACY...ST
FRANCIS...HAM LAKE...FOREST LAKE...EAST BETHEL...CHISAGO CITY AND
BETHEL.

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE ROOFS...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.

LAT...LON 4523 9276 4520 9310 4540 9346 4541 9344
      4541 9304 4543 9303 4543 9293
TIME...MOT...LOC 2352Z 315DEG 28KT 4537 9310

$$

MDB

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 7:09 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Waseca	36 min
May 31, 2:24 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur	51 min
May 31, 3:08 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Rice, Steele, Waseca	67 min
May 31, 4:15 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Freeborn, Steele, Waseca	48 min
May 31, 4:15 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Sherburne	60 min
May 31, 4:23 PM CDT	Severe Thunderstorm Warning	MPX	Morrison	67 min
May 31, 4:43 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec, Mille Lacs, Morrison	62 min
May 31, 5:01 PM CDT	Severe Thunderstorm Warning	MPX	Sherburne, Wright	59 min
May 31, 5:16 PM CDT	Tornado Warning	MPX	Sherburne, Wright	44 min
May 31, 5:25 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Hennepin, Ramsey	65 min
May 31, 5:28 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Mille Lacs, Morrison	62 min
May 31, 5:38 PM CDT	Tornado Warning	MPX	Hennepin, Wright	40 min
May 31, 6:17 PM CDT	Severe Thunderstorm Warning	MPX	Chisago, Isanti	58 min
May 31, 6:26 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Hennepin, Ramsey, Scott	50 min
May 31, 6:44 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec, Mille Lacs, Morrison	46 min
May 31, 6:55 PM CDT	Tornado Warning	MPX	Anoka, Chisago, Washington	50 min

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.