Alert archive / North Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 284, NWS Grand Forks, ND

August 27, 2002Towner County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 27, 2002, 8:58 PM CDT for Towner County, North Dakota. It was in force for 47 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 27, 2002, 8:58 PM CDT (01:58 UTC)
Expired: Aug 27, 2002, 9:45 PM CDT
In force: 47 min
Issued by: NWS Grand Forks, ND
Area: Counties, with a storm outline in the text

County Towner County, ND

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 27, 4:40 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 2.0 hours before the alert went out and 249 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: 1222 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 2291 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 31 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.

661 
WUUS53 KFGF 280158
SVRFAR
NDC095-280245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
858 PM CDT TUE AUG 27 2002

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  TOWNER COUNTY IN NORTHEAST NORTH DAKOTA.

* UNTIL 945 PM CDT.

* AT 855 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES NORTHEAST OF ROCKLAKE...OR ABOUT 36
  MILES WEST OF LANGDON...MOVEMENT WAS TO THE EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL REMAIN IN RURAL AREAS OF

  EASTERN TOWNER COUNTY.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM TUESDAY
EVENING FOR NORTHWESTERN MINNESOTA AND NORTHEAST NORTH DAKOTA.

LAT...LON 4894 9919 4860 9940 4851 9917 4883 9900


BERG

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 27, 8:35 PM CDT, 23 minutes earlier.

Area forecast discussion, Aug 27, 8:35 PM CDT, 23 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
835 PM CDT TUE AUG 27 2002

FORECAST CHALLENGE AGAIN IS ONGOING SEVERE WEATHER THREAT. CURRENT
WATCH IS IN EFFECT UNTIL 10 PM FOR THE NORTHERN HALF OF THE FA.
LATEST SFC MAP SHOWS SFC LOW OVER SOUTHWEST ND. DRY/WARM PUNCH IN
THIS AREA SHOWED UP BETTER EARLIER AS A POSSIBLE WARM FRONT FROM
KBIS-KJMS-KABR (WHERE KBIS ROSE TO AROUND 90). ONE COVERGENT
BOUNDARY EXTENDS FROM KBIS UP TOWARD CYWG WITH ANOTHER ONE WORKING
SOUTH IN THE NORTHERN RED RIVER VALLEY. THIS LAST BOUNDARY IS
WORKING INTO MORE JUICY LOW LEVEL MOISTURE BUT FURTHER FROM THE MAIN
UPPER FORCING. ETA/MESOETA HINT AT A WEAK 850 MB JET DEVELOPING
DURING THE 03Z-06Z TIME FRAME AND THE KMVX 88D CURRENTLY SHOWS 25
KNOTS IN THE LOWEST GATES. THE LINE FROM KBIS TO KJMS ALSO HAS BEEN
PRODUCING SEVERE WEATHER AND THIS LINE CONTINUES TO MOVE TO THE EAST
TOWARD THE WESTERN FRINGES OF THE FA. BOTH THESE AREAS REMAIN IN THE
MOISTURE CONVERGENCE BULLSEYE AND AREA OF LOWEST LIS. SEVERE
WEATHER THREAT WILL CONTINUE THROUGH THE WATCH EXPIRATION TIME AND
MAY (LIKE LAST NIGHT) SEE A FEW SEVERE STORMS AFTER 10 PM. WILL HOLD
OFF ON ANY UPDATE UNTIL AROUND 10 PM AS ZONES IN GOOD SHAPE. ONLY
UPDATE SHOULD BE WATCH HEADLINES.

.FGF...NONE.

GODON

In the hours before

Local storm report, Aug 27, 3:04 PM CDT, 5 hours 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
304 PM CDT TUE AUG 27 2002

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

0520 PM    5 N MCINTOSH              MN   TORNADO
08/26/02   POLK                           REPORTED BY PUBLIC.

0630 PM    FLOM                      MN   2.50 INCH HAIL
08/26/02   NORMAN                         REPORTED BY PUBLIC.

0720 PM    1 N OGEMA                 MN   .75 INCH HAIL
08/26/02   BECKER                         REPORTED BY PUBLIC.

0720 PM    1 W WAUBUN                MN   .75 INCH HAIL
08/26/02   MAHNOMEN                       REPORTED BY PUBLIC.

0220 AM    4 W LEEDS                 ND   WIND DAMAGE
08/27/02   BENSON                         CROP DAMAGE. REPORTED BY
                                          PUBLIC.

DPORTER

Local storm report, Aug 27, 5:40 PM CDT, 3 hours 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
540 PM CDT TUE AUG 27 2002

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

0515 PM    7 SE MAIDA                ND   2.50 INCH HAIL
08/27/02   CAVALIER                       HAILED 20 MINUTES
                                          UNTIL 525 PM CDT
                                          GROUND WHITE

Local storm report, Aug 27, 6:15 PM CDT, 2 hours 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
615 PM CDT TUE AUG 27 2002

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

0515 PM    7 SE MAIDA                ND   2.50 INCH HAIL
08/27/02   CAVALIER                       HAILED 20 MINUTES
                                          UNTIL 525 PM CDT
                                          GROUND WHITE

0557 PM    1 NW WALHALLA             ND   .75 INCH HAIL
08/27/02   PEMBINA                        HAILED UNTIL 602 PM

0605 PM    6 E VANG                  ND   1.75 INCH HAIL
08/27/02   CAVALIER                       GROUND WHITE

Local storm report, Aug 27, 7:20 PM CDT, 1 hour 38 minutes before

PRELIMINARY LOCAL STORM REPORT...EVENT SUMMARY
NATIONAL WEATHER SERVICE GRAND FORKS, ND
720 PM CDT TUE AUG 27 2002

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

0515 PM    7 SE MAIDA                ND   2.50 INCH HAIL
08/27/02   CAVALIER                       HAILED 20 MINUTES
                                          UNTIL 525 PM CDT
                                          GROUND WHITE

0557 PM    1 NW WALHALLA             ND   .75 INCH HAIL
08/27/02   PEMBINA                        HAILED UNTIL 602 PM

0605 PM    6 E VANG                  ND   1.75 INCH HAIL
08/27/02   CAVALIER                       GROUND WHITE

0615 PM    2 SE WALHALLA             ND   1.00 INCH HAIL
08/27/02   PEMBINA                        GROUND WHITE

0634 PM    6 NW CAVALIER             ND   .75 INCH HAIL
08/27/02   PEMBINA

0648 PM    3 W CAVALIER              ND   1.00 INCH HAIL
08/27/02   PEMBINA

0655 PM    10 E LANGDON              ND   .75 INCH HAIL
08/27/02   CAVALIER

Local storm report, Aug 27, 8:40 PM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT...EVENT SUMMARY
NATIONAL WEATHER SERVICE GRAND FORKS, ND
840 PM CDT TUE AUG 27 2002

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

0515 PM    7 SE MAIDA                ND   2.50 INCH HAIL
08/27/02   CAVALIER                       HAILED 20 MINUTES
                                          UNTIL 525 PM CDT
                                          GROUND WHITE

0557 PM    1 NW WALHALLA             ND   .75 INCH HAIL
08/27/02   PEMBINA                        HAILED UNTIL 602 PM

0605 PM    6 E VANG                  ND   1.75 INCH HAIL
08/27/02   CAVALIER                       GROUND WHITE

0615 PM    2 SE WALHALLA             ND   1.00 INCH HAIL
08/27/02   PEMBINA                        GROUND WHITE

0634 PM    6 NW CAVALIER             ND   .75 INCH HAIL
08/27/02   PEMBINA

0648 PM    3 W CAVALIER              ND   1.00 INCH HAIL
08/27/02   PEMBINA

0655 PM    10 E LANGDON              ND   .75 INCH HAIL
08/27/02   CAVALIER

0755 PM    3 SW GLASSTON             ND   .75 INCH HAIL
08/27/02   PEMBINA

0805 PM    3 NE FAIRDALE             ND   .75 INCH HAIL
08/27/02   WALSH

0824 PM    3.5 S ST THOMAS           ND   .75 INCH HAIL
08/27/02   PEMBINA

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 7:47 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Pembina, Walsh	58 min
Aug 27, 8:43 PM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	47 min
Aug 27, 9:14 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier	46 min
Aug 27, 9:35 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	40 min
Aug 27, 10:13 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	47 min
Aug 27, 10:29 PM CDT	Flash Flood Warning	FGF	Walsh	4 hr
Aug 27, 10:43 PM CDT	Severe Thunderstorm Warning	FGF	Towner	47 min
Aug 27, 10:57 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	48 min
Aug 28, 4:30 PM CDT	Severe Thunderstorm Warning	FGF	Richland	45 min
Aug 28, 5:01 PM CDT	Tornado Warning	FGF	Richland	44 min
Aug 28, 5:20 PM CDT	Severe Thunderstorm Warning	FGF	Steele, Traill	40 min
Aug 28, 5:47 PM CDT	Tornado Warning	FGF	Richland	43 min
Aug 28, 5:55 PM CDT	Severe Thunderstorm Warning	FGF	Cass	35 min
Aug 28, 6:14 PM CDT	Flash Flood Warning	FGF	Richland	6 hr
Aug 28, 6:16 PM CDT	Flash Flood Warning	FGF	Richland	6 hr
Aug 28, 6:44 PM CDT	Severe Thunderstorm Warning	FGF	Cass	61 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 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.