Alert archive / North Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 283, NWS Grand Forks, ND

August 27, 2002Pembina County, Walsh County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 27, 2002, 8:43 PM CDT for Pembina County, Walsh County, North Dakota. It was in force for 47 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 27, 2002, 8:43 PM CDT (01:43 UTC)
Expired
Aug 27, 2002, 9:30 PM CDT
In force
47 min
Issued by
NWS Grand Forks, ND
Area
Counties, with a storm outline in the text

Counties Pembina County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 118 km from the middle of the area, began a volume at 01:42 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

TimeReportWhereRemark
Aug 27, 8:50 PM CDTHail 0.75St Thomas, ND
Aug 27, 8:55 PM CDTHail 0.88Auburn, ND
Aug 27, 9:40 PM CDTHail 1Fairdale, ND

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.

IssuedProductOfficeLasted
Aug 27, 4:40 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 1.7 hours before the alert went out and 304 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-pSkew-T log-p diagram, Bismarck Municip, ND at 00:00Z on 2002-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1222 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 00:00Z on 2002-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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

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, 8 minutes earlier.

Area forecast discussion, Aug 27, 8:35 PM CDT, 8 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 39 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 3 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 28 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 23 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, 3 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.

IssuedProductOfficeCountiesLasted
Aug 27, 7:47 PM CDTSevere Thunderstorm WarningFGFMarshall58 min
Aug 27, 11:18 PM CDTFlash Flood WarningFGFMarshall6 hr
Aug 28, 1:15 PM CDTSevere Thunderstorm WarningFGFClearwater45 min
Aug 28, 1:44 PM CDTSevere Thunderstorm WarningFGFBecker46 min
Aug 28, 2:00 PM CDTSevere Thunderstorm WarningFGFClearwater, Hubbard45 min
Aug 28, 4:30 PM CDTSevere Thunderstorm WarningFGFWilkin45 min
Aug 28, 4:44 PM CDTSevere Thunderstorm WarningFGFClay46 min
Aug 28, 5:01 PM CDTTornado WarningFGFWilkin44 min
Aug 28, 5:09 PM CDTSevere Thunderstorm WarningFGFBecker, Mahnomen51 min
Aug 28, 5:27 PM CDTSevere Thunderstorm WarningFGFOtter Tail48 min
Aug 28, 5:29 PM CDTSevere Thunderstorm WarningFGFClay46 min
Aug 28, 5:47 PM CDTTornado WarningFGFWilkin43 min
Aug 28, 6:00 PM CDTSevere Thunderstorm WarningFGFBecker, Mahnomen60 min
Aug 28, 6:14 PM CDTFlash Flood WarningFGFWilkin6 hr
Aug 28, 6:16 PM CDTFlash Flood WarningFGFWilkin6 hr
Aug 28, 6:16 PM CDTSevere Thunderstorm WarningFGFClay59 min
Aug 28, 6:57 PM CDTFlash Flood WarningFGFBecker, Clay, Mahnomen6 hr
Aug 27, 8:58 PM CDTSevere Thunderstorm WarningFGFTowner47 min
Aug 27, 9:14 PM CDTSevere Thunderstorm WarningFGFCavalier46 min
Aug 27, 9:35 PM CDTSevere Thunderstorm WarningFGFWalsh40 min
Aug 27, 10:13 PM CDTSevere Thunderstorm WarningFGFWalsh47 min
Aug 27, 10:29 PM CDTFlash Flood WarningFGFWalsh4 hr
Aug 27, 10:43 PM CDTSevere Thunderstorm WarningFGFTowner47 min
Aug 27, 10:57 PM CDTSevere Thunderstorm WarningFGFWalsh48 min
Aug 28, 5:20 PM CDTSevere Thunderstorm WarningFGFSteele, Traill40 min
Aug 28, 5:55 PM CDTSevere Thunderstorm WarningFGFCass35 min
Aug 28, 6:44 PM CDTSevere Thunderstorm WarningFGFCass61 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2002Every 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.