Alert archive / North Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 102, NWS Grand Forks, ND

June 25, 2002Sargent County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 25, 2002, 5:21 PM CDT for Sargent County, North Dakota. It was in force for 24 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: Jun 25, 2002, 5:21 PM CDT (22:21 UTC)
Expired: Jun 25, 2002, 5:45 PM CDT
In force: 24 min
Issued by: NWS Grand Forks, ND
Area: Counties, with a storm outline in the text

County Sargent County, ND

The radar

The Aberdeen radar (KABR), 115 km from the middle of the area, began a volume at 22:24 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
Jun 25, 5:30 PM CDT	Hail 0.75	Milnor, 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.

Issued	Product	Office	Lasted
Jun 25, 2:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.4 hours before the alert went out and 164 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: 529 J/kg
Mixed-layer CIN: -324 J/kg
Mixed-layer LCL: 1156 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFGF 252221
SVRFAR
NDC081-252245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
521 PM CDT TUE JUN 25 2002

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  EAST CENTRAL SARGENT COUNTY IN SOUTHEAST NORTH DAKOTA.

* UNTIL 545 PM CDT.

* AT 519 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER NORTHEASTERN SARGENT COUNTY...OR ABOUT 34
  MILES WEST OF WAHPETON...MOVEMENT WAS TO THE EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL REMAIN IN RURAL AREAS OF

  EASTERN SARGENT COUNTY.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM TUESDAY
EVENING FOR NORTHWESTERN MINNESOTA AND EASTERN NORTH DAKOTA.

LAT...LON 4628 9740 4613 9748 4605 9730 4623 9731


55

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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 Jun 25, 2:00 PM CDT, 3 hours 21 minutes earlier.

Area forecast discussion, Jun 25, 2:00 PM CDT, 3 hours 21 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
200 PM CDT TUE JUN 25 2002

TRYING TO GET PRODUCTS OUT EARLY DUE TO ONGOING SEVERE WEATHER. MAIN
CONCERN REMAINS THE SEVERE POTENTIAL YET THIS AFTERNOON AND EARLY
EVENING ACROSS PORTIONS OF THE FA. MODELS IN GOOD AGREEMENT OVERALL
SO FOLLOWED AN ETA/AVN BLEND. MOS TEMPS ALSO MATCH UP WELL SO DID
NOT DEVIATE MUCH.

SFC MAP AT 18Z SHOWS THE MAIN SFC LOW YET IN SOUTHERN ONTARIO WITH
STILL TWO SFC BOUNDARIES TO WORK WITH. FIRST EXTENDS DOWN FROM THE
LOW INTO NORTHEAST SD AND THE OTHER BACK DOOR COLD FRONT EXTENDS
ALONG THE CANADIAN BORDER. SOME CONVECTION DEVELOPING ALONG EACH
BOUNDARY...EVIDENT ON BOTH THE KMBX 88D AND KMVX 88D. EXPECT GOOD
CONVERGENT LOW LEVEL (EXTREMELY MOIST) FLOW AS THESE TWO BOUNDARIES
INTERACT. MSAS SHOWING BEST MOISTURE CONVERGENCE OVER EAST CENTRAL
ND AND ANOTHER BULLSEYE EAST OF LAKE OF THE WOODS. AIRMASS VERY
UNSTABLE WITH MSAS SHOWING LIS AS LOW AS -10 ACROSS THE AREA. MAIN
500 MB WAVE MOVES INTO THE MN ARROWHEAD BY 06Z WED ALONG WITH MAIN
UPPER JET ENERGY. MODELS ALSO PROGRESS THE MAIN SFC BOUNDARY EAST OF
THE FA BY 06Z...SO WILL GO WITH A CHC OF TSTORMS FOR THE EVENING
PERIOD MOSTLY FROM THE VALLEY AND EAST. SOME OF THESE STORMS ALREADY
SEVERE (SEE SPC DISCUSSIONS) SO WILL ADD A SEVERE MENTION AS WELL.
THESE CELLS HAVE DISPLAYED SOME CIRCULATION...ALTHOUGH NO CONFIRMED
REPORTS FROM THE SFC YET. WITH 500 MB RIDGING BUILDING IN AND
STABILIZING AIR BEHIND THE TROUGH/FRONT PASSAGE...WILL LEAVE REST OF
NIGHT DRY.

500 MB RIDGING CONTINUES TO BUILD INTO THE NORTHERN PLAINS WED AND
THE REMAINDER OF EARLY PERIODS WITH MAIN CONCERN TEMPS. ONLY TWEAKED
TEMPS A DEGREE OR TWO FROM INHERITED GRIDS AS CONTINUITY REMAINS
VERY GOOD. PERIOD LOOKS QUITE WARM WITH TEMPS ABOVE AVERAGE. AREA
DOES NOT DRY OUT MUCH WITH HIGH PRESSURE OVERHEAD...DEW POINTS
REMAIN IN THE LOW TO MID 60S.

EXTENDED...LONG RANGE MODELS SIMILAR IN KEEPING UPPER LEVEL RIDGE
OVER AREA THROUGH MAJORITY OF EXTENDED FORECAST PERIOD. MRF STILL
HAS A TROF MOVING THROUGH RIDGE ON SAT...BUT UKMET AND ECMWF DONT.
CANADIAN HINTS AT POSSIBILITY...BUT HAS LATER TIMING. AS A RESULT...
WILL KEEP SAT DRY FOR NOW. RIDGE STARTS PULLING E OF AREA ON MON AS
SFC LOW DEVELOPS IN ROCKIES...SO KEPT CHANCE OF THUNDERSTORMS FOR
MON AFTERNOON THROUGH TUE. AS FAR AS TEMPS...FMR AND MEX BOTH
CLOSE...SO USED COMPROMISE FOR FORECAST...KEEPING TEMPS NEAR TO
ABOVE NORMAL.

.FGF...NONE.

GODON/NG

In the hours before

Local storm report, Jun 25, 2:59 PM CDT, 2 hours 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
259 PM CDT TUE JUN 25 2002

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

0135 PM    5 W HOPE                  ND   TORNADO
06/25/02   STEELE                         BRIEF ROPE

0137 PM    7 NW LUVERNE              ND
06/25/02   GRIGGS                         MULTIPLE FUNNEL CLOUDS 7NW
                                          LUVERNE

0139 PM    5 N LUVERNE               ND   1.75 INCH HAIL
06/25/02   STEELE

0144 PM    3 SW AYR                  ND   1 INCH HAIL
06/25/02   CASS

0150 PM    3 SW AYR                  ND   1 INCH HAIL
06/25/02   CASS

0200 PM    8 W HOPE                  ND   1.75 INCH HAIL
06/25/02   STEELE

0210 PM    5 SW PILLSBURY            ND   1 INCH HAIL
06/25/02   BARNES

NNNN

Local storm report, Jun 25, 4:41 PM CDT, 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
441 PM CDT TUE JUN 25 2002

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

0327 PM    6 E REYNOLDS              ND   .75 INCH HAIL
06/25/02   TRAILL

0333 PM    8 SE THOMPSON             ND   .88 INCH HAIL
06/25/02   GRAND FORKS

0333 PM    2 SE CASSELETON           ND   .88 INCH HAIL
06/25/02   CASS

0340 PM    6 W ELDRED                MN   1 INCH HAIL
06/25/02   GRAND FORKS

NNNN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 25, 1:14 PM CDT	Severe Thunderstorm Warning	FGF	Steele	46 min
Jun 25, 1:21 PM CDT	Tornado Warning	FGF	Griggs, Steele	24 min
Jun 25, 1:45 PM CDT	Tornado Warning	FGF	Steele	30 min
Jun 25, 2:07 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass	38 min
Jun 25, 2:45 PM CDT	Severe Thunderstorm Warning	FGF	Cass	45 min
Jun 25, 3:50 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	55 min
Jun 25, 3:54 PM CDT	Severe Thunderstorm Warning	FGF	Ransom, Sargent	51 min
Jun 25, 4:08 PM CDT	Severe Thunderstorm Warning	FGF	Richland	52 min
Jun 25, 5:10 PM CDT	Severe Thunderstorm Warning	FGF	Richland	35 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.