Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 206, NWS Grand Forks, ND

August 11, 2002Polk County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 11, 2002, 8:37 PM CDT for Polk County, Minnesota. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 11, 2002, 8:37 PM CDT (01:37 UTC)
Expired: Aug 11, 2002, 9:00 PM CDT
In force: 23 min
Issued by: NWS Grand Forks, ND
Area: Counties, with a storm outline in the text

County Polk County, MN

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, 1.6 hours before the alert went out and 212 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.

784 
WUUS53 KFGF 120137
SVRFAR
MNC119-120200-

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

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  SOUTHEASTERN POLK COUNTY IN NORTHWEST MINNESOTA.

* UNTIL 900 PM CDT.

* AT 830 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A     
  SEVERE THUNDERSTORM 5 MILES WEST OF FOSSTON...OR ABOUT 41 MILES    
  SOUTHEAST OF   THIEF RIVER FALLS...MOVEMENT WAS TO THE EAST AT 40  
  MPH.  THE LINE OF THUNDERSTORMS IS STARTING TO BOW INTO SOUTHEAST
  POLK COUNTY WITH THE POTENTIAL FOR DAMAGING WINDS OVER 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...

  FOSSTON AT 840 PM AND
  LENGBY AT 850 PM.

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

LAT...LON 4766 9588 4751 9592 4753 9559 4779 9567

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, 22 minutes earlier.

Area forecast discussion, Aug 11, 8:15 PM CDT, 22 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, 50 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, 8:46 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Beltrami, Clearwater, Hubbard	59 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; the sounding from the Mesonet's radiosonde archive.