Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 207, NWS Grand Forks, ND

August 11, 20024 counties in Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 11, 2002, 8:46 PM CDT for 4 counties in Minnesota. It was in force for 59 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: Aug 11, 2002, 8:46 PM CDT (01:46 UTC)
Expired: Aug 11, 2002, 9:45 PM CDT
In force: 59 min
Issued by: NWS Grand Forks, ND
Area: Counties, with a storm outline in the text

Counties Becker County, MN, Beltrami County, MN, Clearwater County, MN, Hubbard County, MN

What was reported inside it

Time	Report	Where	Remark
Aug 11, 8:55 PM CDT	Tornado F0	Shevlin, MN	A brief touchdown knocked down a few trees in a yard.
Aug 11, 9:30 PM CDT	Thunderstorm Wind	Lake Itasca, MN	A large tree was blown down.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

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, 6:45 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 1.8 hours before the alert went out and 189 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: 204 J/kg
Mixed-layer CIN: -162 J/kg
Mixed-layer LCL: 1684 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

573 
WUUS53 KFGF 120146
SVRFAR
MNC005-007-029-057-120245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
844 PM CDT SUN AUG 11 2002

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  SOUTHERN BELTRAMI COUNTY IN NORTH CENTRAL MINNESOTA...     
  HUBBARD COUNTY IN NORTH CENTRAL MINNESOTA...
  EASTERN BECKER COUNTY IN NORTHWEST MINNESOTA AND
  CLEARWATER COUNTY IN NORTHWEST MINNESOTA.

* UNTIL 945 PM CDT.

* AT 840 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE
  LEADING EDGE OF SEVERE THUNDERSTORMS ALONG A LINE EXTENDING FROM 23
  MILES NORTHWEST OF BEMIDJI TO 7 MILES EAST OF DETROIT LAKES...     
  MOVEMENT WAS TO THE EAST AT 40 MPH.  STRAIGHTLINE WINDS OVER 60    
  MPH WILL BE LIKELY.

* SEVERE THUNDERSTORMS WILL BE NEAR...

  ZERKEL AT 845 PM...
  UPPER RICE LAKE AT 850 PM...
  ITASCA STATE PARTK AT 855 PM...
  SOLWAY AT 905 PM...
  BEMIDJI AT 915 PM AND
  LAKE GEORGE AT 925 PM.

REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT MONDAY
MORNING FOR NORTHWESTERN MINNESOTA AND SOUTHEAST NORTH DAKOTA. A
SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL MIDNIGHT
MONDAY MORNING FOR WEST CENTRAL MINNESOTA AND SOUTHEAST NORTH DAKOTA.

LAT...LON 4777 9524 4674 9574 4688 9474 4778 9462


DTR

NNNN

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 11, 8:15 PM CDT, 31 minutes earlier.

Area forecast discussion, Aug 11, 8:15 PM CDT, 31 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
815 PM CDT SUN AUG 11 2002

...SEVERE WEATHER THREAT CONTINUES ALG THE RRV AND INTO WRN MN...

ANALYSIS/NEAR TERM...DISCUSSION IS ABBREVIATED DUE TO ONGOING SEVERE
WEATHER. SUPERCELL TSTMS CONTINUE TO DEVELOP ALG A LINE FRM EXTREEM
NWRN MN INTO EXTREME SERN ND...AND SOUTHWARD INTO ERN SD. THE
PREFRONTAL LINE IS BEGINNING TO BOW FROM NERN NORMAN COUNTY TOWARDS
SRN BELTRAMI COUNTY IN NORTHWEST MN ATTM. WATCH BOX WAS EXTENDED
ACROSS MUCH OF NWRN MN THROUGH MIDNIGHT. ADDITIONAL SHOWER/TSTM
DEVELOPMENT IS STILL POSSIBLE LATER THIS EVENING IN ERN ND AS UPR
LVL DYNAMICS INCREASE. HOWEVER MUCH OF THIS WILL LIKELY DEVELOP INTO
WIDESPREAD RAIN AND PROGRESS ACROSS THE RRV INTO NWRN MN
OVERNIGHT.

.FGF...SEVERE THUNDERSTORM WATCH FOR RRV AND NWRN AND WCNTRL MN
THROUGH MIDNIGHT.

GUST

In the hours before

Local storm report, Aug 11, 7:47 PM CDT, 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
747 PM CDT SUN AUG 11 2002

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0510 PM    5 S WARWICK               ND   1.00 INCH HAIL
08/11/02   BENSON

0515 PM    WARWICK                   ND   1.75 INCH HAIL
08/11/02   BENSON

0530 PM    3 S DOYON                 ND   .75 INCH HAIL
08/11/02   RAMSEY

0535 AM    14 E DEVILS LAKE          ND   .75 INCH HAIL
08/11/02   RAMSEY

0605 PM    1/2 NE LAWTON             ND   1.25 INCH HAIL
08/11/02   RAMSEY                         MIXED DIME TO HALF DOLLAR
                                          HAIL FELL FOR 10 MIN

0555 PM    7 WSW HANNAFORD           ND   60 MPH WIND GUST
08/11/02   GRIGGS                         WINDS OCCURRED FROM 555 PM
                                          TO 610 PM

0610 PM    6 SW FAIRDALE             ND   1.00 INCH HAIL
08/11/02   WALSH

0705 PM    DAVENPORT                 ND   65 MPH WIND GUST
08/11/02   CASS

0710 PM    ARGUSVILLE                ND   60 MPH WIND GUST
08/11/02   CASS                           REPORTED BY STATE PATROL

0715 AM    HENDRUM                   MN   60 MPH WIND GUST
08/11/02   NORMAN

0735 PM    GLYNDON                   MN   80 MPH WIND GUST
08/11/02   CLAY

KENNEDY

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 11, 7:12 PM CDT	Severe Thunderstorm Warning	FGF	Clay, Norman	48 min
Aug 11, 7:51 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Clearwater, Mahnomen	54 min
Aug 11, 7:56 PM CDT	Tornado Warning	FGF	Mahnomen, Norman	49 min
Aug 11, 8:37 PM CDT	Severe Thunderstorm Warning	FGF	Polk	23 min
Aug 11, 8:53 PM CDT	Tornado Warning	FGF	Beltrami, Clearwater, Hubbard	52 min
Aug 11, 9:37 PM CDT	Severe Thunderstorm Warning	FGF	Otter Tail, Wadena	38 min
Aug 11, 11:15 PM CDT	Severe Thunderstorm Warning	FGF	Grant	45 min
Aug 12, 12:19 AM CDT	Severe Thunderstorm Warning	FGF	Otter Tail	56 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2002 Every severe thunderstorm warning in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.