Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 307, NWS Grand Forks, ND

August 28, 2002Grant County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 28, 2002, 10:19 PM CDT for Grant County, Minnesota. It was in force for 41 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: Aug 28, 2002, 10:19 PM CDT (03:19 UTC)
Expired: Aug 28, 2002, 11:00 PM CDT
In force: 41 min
Issued by: NWS Grand Forks, ND
Area: Counties, with a storm outline in the text

County Grant County, MN

The radar

The Aberdeen radar (KABR), 194 km from the middle of the area, began a volume at 03:23 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
Aug 28, 11:00 PM CDT	Thunderstorm Wind	Ashby, MN	Trees were 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 nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 3.3 hours before the alert went out and 220 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: 948 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 1709 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 20 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.

377 
WUUS53 KFGF 290319
SVRFAR
MNC051-290400-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
1019 PM CDT WED AUG 28 2002

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  GRANT COUNTY IN WEST CENTRAL MINNESOTA.

* UNTIL 1100 PM CDT.

* AT 1017 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 3 MILES NORTHWEST OF ELBOW LAKE...OR ABOUT 19
  MILES SOUTH OF FERGUS FALLS...MOVEMENT WAS TO THE NORTHEAST AT 20
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...

  ELBOW LAKE AT 1020 PM...
  BARRETT AT 1025 PM...
  ERDAHL AT 1040 PM AND
  ASHBY AT 1045 PM.

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

LAT...LON 4607 9621 4582 9613 4580 9579 4611 9582


30
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 28, 7:50 PM CDT, 2 hours 29 minutes earlier.

Area forecast discussion, Aug 28, 7:50 PM CDT, 2 hours 29 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
750 PM CDT WED AUG 28 2002

.CURRENT OBSERVATIONAL OVERVIEW...
00Z MSAS ANALYSIS DEPICTED WEAK LOW PRESSURE OVER EXTREME NORTH
CENTRAL SOUTH DAKOTA WITH ASSOCIATED INVERTED TROUGH AXIS FROM
SOUTHEAST NORTH DAKOTA INTO WESTERN MINNESOTA. LATEST SATELLITE AND
KMVX RADAR INDICATED STRONG/SEVERE THUNDERSTORMS FIRING ALONG AND
AHEAD OF TROUGH AXIS IN VICINITY OF STRONG INSTABILITY AND ENHANCED
MOISTURE FLUX CONVERGENCE.

.FORECAST DETAILS...
EXPECT STORMS TO SLOWLY WEAKEN IN TERM OF SEVERITY DURING NEXT
COUPLE OF HOURS AS DAYTIME HEATING CEASES. HOWEVER...EXPECT
FLOODING POTENTIAL TO PERSIST AS MULTICELLUAR STORMS MERGE MORE INTO
MCS SITUATION REMAINDER OF NIGHT. WILL MONITOR RADAR TRENDS DURING
NEXT FEW HOURS TO DETERMINE WHERE BEST LINGERING HEAVY THREAT EXISTS
OVERNIGHT...AND THUS PERHAPS BE ABLE HOPE TO FINE TUNE INHERITED
FLOOD WATCH.

.FGF...FLOOD WATCH ALL OF FA EXCEPT DVL REGION AND EXTREME NE ND AND
NW MN.

BERG

In the hours before

Local storm report, Aug 28, 6:42 PM CDT, 3 hours 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
642 PM CDT WED AUG 28 2002

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

0635 PM    SABIN                     MN   .75 INCH HAIL
08/28/02   CLAY                           REPORTED BY CO-OP
                                          OBSERVER.

DPORTER

Local storm report, Aug 28, 6:59 PM CDT, 3 hours 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
659 PM CDT WED AUG 28 2002

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

0530 PM    2 N OGEMA                 MN   1.75 INCH HAIL
08/28/02   BECKER                         REPORTED BY PUBLIC.

0635 PM    SABIN                     MN   .75 INCH HAIL
08/28/02   CLAY

DPORTER

Local storm report, Aug 28, 7:17 PM CDT, 3 hours 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
717 PM CDT WED AUG 28 2002

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

0705 PM    2 NE AYR                  ND   1.00 INCH HAIL
08/28/02   CASS                           REPORTED BY PUBLIC.

0715 PM    AYR                       ND   1.00 INCH HAIL
08/28/02   CASS

DPORTER

Local storm report, Aug 28, 7:40 PM CDT, 2 hours 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
740 PM CDT WED AUG 28 2002

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

0725 PM    7 NW VERGAS               MN   .75 INCH HAIL
08/28/02   OTTER TAIL                     REPORTED BY PUBLIC.

DPORTER

Local storm report, Aug 28, 9:38 PM CDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
938 PM CDT WED AUG 28 2002

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

0925 PM    3 S NIMROD                MN   .75 INCH HAIL
08/28/02   WADENA                         REPORTED BY PUBLIC.

DPORTER

Local storm report, Aug 28, 9:48 PM CDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
948 PM CDT WED AUG 28 2002

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

0432 PM    3 N BRECKENRIDGE          MN   .75 INCH HAIL
08/28/02   WILKIN                         REPORTED BY PUBLIC.

0433 PM    WAHPETON                  ND   1.00 INCH HAIL
08/28/02   RICHLAND                       REPORTED BY TRAINED
                                          SPOTTER.

0515 PM    8 NW ROTHSAY              MN   .75 INCH HAIL
08/28/02   WILKIN

0520 PM    4 E BARNESVILLE           MN   1.75 INCH HAIL
08/28/02   CLAY

0520 PM    5 NE LAWNDALE             MN   1.75 INCH HAIL
08/28/02

0527 PM    10 NE HANKINSON           ND   FUNNEL CLOUD
08/28/02   RICHLAND

0530 PM    2 N OGEMA                 MN   1.75 INCH HAIL
08/28/02   BECKER                         REPORTED BY PUBLIC.

0530 PM    9 NW PELICAN RAPIDS       MN   1.00 INCH HAIL
08/28/02   OTTER TAIL                     REPORTED BY PUBLIC.

0540 PM    DWIGHT                    ND   .75 INCH HAIL
08/28/02   RICHLAND

0545 PM    4 E HANKINSON             ND   1.00 INCH HAIL
08/28/02   RICHLAND                       REPORTED BY PUBLIC.

0545 PM    4 SE HITTERDAL            MN   .75 INCH HAIL
08/28/02   CLAY                           REPORTED BY PUBLIC.

0600 PM    4 E HANKINSON             ND   .75 INCH HAIL
08/28/02   RICHLAND                       REPORTED BY PUBLIC.

0600 PM    2 E KINDRED               ND   .75 INCH HAIL
08/28/02   CASS                           REPORTED BY PUBLIC.

0600 PM    3 E WAUBUN                MN   .88 INCH HAIL
08/28/02   MAHNOMEN                       REPORTED BY CO-OP OBSERVER.

0635 PM    SABIN                     MN   .75 INCH HAIL
08/28/02   CLAY                           REPORTED BY CO-OP OBSERVER.

0635 PM    SABIN                     MN   .75 INCH HAIL
08/28/02   CLAY

0705 PM    2 NE AYR                  ND   1.00 INCH HAIL
08/28/02   CASS                           REPORTED BY PUBLIC.

0715 PM    AYR                       ND   1.00 INCH HAIL
08/28/02   CASS

0725 PM    7 NW VERGAS               MN   .75 INCH HAIL
08/28/02   OTTER TAIL                     REPORTED BY PUBLIC.

0925 PM    3 S NIMROD                MN   .75 INCH HAIL
08/28/02   WADENA                         REPORTED BY PUBLIC.

DPORTER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 7:09 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Otter Tail	51 min
Aug 28, 7:58 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Hubbard	47 min
Aug 28, 8:05 PM CDT	Severe Thunderstorm Warning	FGF	Otter Tail	40 min
Aug 28, 8:46 PM CDT	Severe Thunderstorm Warning	FGF	Otter Tail, Wadena	44 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; radar from the NEXRAD Level II archive.