Alert archive / North Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 58, NWS Grand Forks, ND

June 9, 2002Cass County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 9, 2002, 9:42 AM CDT for Cass County, North Dakota. It was in force for 48 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 9, 2002, 9:42 AM CDT (14:42 UTC)
Expired
Jun 9, 2002, 10:30 AM CDT
In force
48 min
Issued by
NWS Grand Forks, ND
Area
Counties, with a storm outline in the text

County Cass County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 52 km from the middle of the area, began a volume at 14:42 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
Jun 9, 10:05 AM CDTHail 0.75Gardner, 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 nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 2.7 hours before the alert went out and 258 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, Aberdeen, SD at 12:00Z on 2002-06-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2010 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 12:00Z on 2002-06-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 332 square meters per square second.193958Sfc1 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
2010 J/kg
Mixed-layer CIN
-275 J/kg
Mixed-layer LCL
811 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
332 m²/s²
0-3 km storm-relative helicity
344 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFGF 091442
SVRFAR
NDC017-091530-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
942 AM CDT SUN JUN 9 2002

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  NORTHEASTERN CASS COUNTY IN SOUTHEAST NORTH DAKOTA.

* UNTIL 1030 AM CDT.

* AT 937 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER AMENIA...OR ABOUT 22 MILES NORTHWEST OF
  FARGO...MOVEMENT WAS TO THE NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...

  ARTHUR AT 945 AM AND
  GARDNER AT 1015 AM.

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

LAT...LON 4704 9739 4692 9721 4711 9686 4723 9714


8

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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 9, 3:33 AM CDT, 6 hours 9 minutes earlier.

Area forecast discussion, Jun 9, 3:33 AM CDT, 6 hours 9 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
333 AM CDT SUN JUN 9 2002

.SHORT TERM...
WATER VAPOR LOOP SHOWS UPPER LOW OVER THE PACIFIC NORTHWEST WITH A
WAVE ON THE WEST SIDE. WAVE APPEARS TO BE DIGGING FARTHER TO THE
SOUTHWEST THAN THE ETA FORECAST. SO PREFER THE SLOWER AVN FOR THE
UPPER AIR FEATURES. HOWEVER PREFER THE ETA HANDLING THE
PRECIPITATION OVER THE NORTHERN PLAINS. 850 THETA-E RIDGE WAS ACROSS
EXTENDED FROM TX TO SD. GOOD E-W THETA-E GRADIENT WAS ACROSS ND WITH
LOW LEVEL JET FLOW ACROSS THE GRADIENT. GRADIENT WILL SHIFT INTO
SOUTHERN CANADA TODAY. ANOTHER ROUND OF THUNDERSTORMS IS EXPECTED
SUNDAY NIGHT AS DRIER/COOLER AIR MOVES INTO WESTERN ND. STORMS WILL
FIRE IN THE WEST AND MOVE INTO THE EASTERN ND. ALSO LOW LEVEL JET
REDEVELOPS SUNDAY NIGHT. DRIER/COOLER AIR CONTINUES TO MOVE INTO
EASTERN ND ON MONDAY. WRAP AROUND PRECIPITATION WILL MOVE INTO FOR
TUESDAY.

.LONG TERM...
NO CHANGES.

.FGF...FLOOD WATCH ENTIRE FORECAST AREA TODAY THROUGH MONDAY.
SEVERE THUNDERSTORM WATCH FOR SOUTHEAST ND AND PARTS OF NORTHEAST ND
TIL 7AM CDT.
HOPPES

In the hours before

Local storm report, Jun 9, 6:13 AM CDT, 3 hours 29 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
613 AM CDT SUN JUN 9 2002

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

1220 AM    DEVILS LAKE               ND   1.00 INCH HAIL
06/09/02   RAMSEY

1224 AM    DEVILS LAKE               ND   1.25 INCH HAIL
06/09/02   RAMSEY

1230 AM    REYNOLDS                  ND   .75 INCH HAIL
06/09/02   TRAILL

0140 AM    5 E WAUBUN                MN   .75 INCH HAIL
06/09/02   MAHNOMEN

0230 AM    GRAND FORKS               ND   FLASH FLOODS
06/09/02   GRAND FORKS                    NUMEROUS CITY STREETS
                                          FLOODED. CARS STRANDED
                                          ALONG UNIVERSITY AVENUE
                                          NEAR THE UNIVERSITY OF
                                          NORTH DAKOTA CAMPUS.

0325 AM    9 NE ADA                  MN   WIND DAMAGE
06/09/02   NORMAN                         SPOTTER ESTIMATED 80 MPH
                                          WIND GUST. 8 TO 10 INCH
                                          DIAMETER TREES DOWN AND
                                          WINDOW BLOWN OUT.

0505 AM    6 SE TWIN VALLEY          MN   .75 INCH HAIL
06/09/02   NORMAN

0605 AM    5 W SYRE                  MN   FLASH FLOODS
06/09/02   NORMAN                         HIGHWAY 113 FLOODED
Special weather statement, Jun 9, 7:18 AM CDT, 2 hours 24 minutes before
MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-091400-

SPECIAL WEATHER STATEMENT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
718 AM CDT SUN JUN 9 2002

...SEVERE THUNDERSTORMS ARE EXPECTED ACROSS EASTERN NORTH DAKOTA AND
NORTHWEST AND WEST CENTRAL MINNESOTA EARLY THIS MORNING AND AGAIN
TONIGHT...

SYNOPSIS...VERY UNSTABLE AIR WILL REMAIN ACROSS THE NORTHERN PLAINS
THROUGH MONDAY MORNING. TEMPERATURES WILL RISE TO THE UPPER 80S IN
THE SOUTH AND EASTERN COUNTIES WITH DEWPOINTS APPROACHING 70 DEGREES.
LOW PRESSURE OVER WESTERN SOUTH DAKOTA WILL MOVE SLOWLY INTO
SOUTHEAST NORTH DAKOTA BY MONDAY MORNING. COOLER DRIER AIR OVER
WESTERN NORTH DAKOTA WILL BEGIN TO SLOWLY SHIFT EAST THROUGH MONDAY
MORNING.

AREA OF CONCERN...A SLIGHT RISK OF SEVERE WEATHER WILL OCCUR EARLY
THIS MORNING SOUTH OF A LINE FROM VALLEY CITY ND TO BEMIDJI MN.
ANOTHER SLIGHT RISK OF SEVERE STORM WILL OCCUR SUNDAY NIGHT OVER ALL
OF EASTERN NORTH DAKOTA AND NORTHWEST AND WEST CENTRAL MINNESOTA.

TIME...UNTIL 10 AM CDT FOR THE SOUTHERN PORTION OF THE REGION. THE
SECOND ROUND OF THUNDERSTORMS ARE EXPECTED AFTER 4 PM.

TYPE OF HAZARD...MAINLY FLOODING. SOME LARGE HAIL AND SOME DAMAGING
WINDS.

HOPPES
NNNN
Special weather statement, Jun 9, 7:20 AM CDT, 2 hours 22 minutes before
MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-101430-

SPECIAL WEATHER STATEMENT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
720 AM CDT SUN JUN 9 2002

...SEVERE THUNDERSTORMS ARE EXPECTED ACROSS EASTERN NORTH DAKOTA AND
NORTHWEST AND WEST CENTRAL MINNESOTA TODAY AND THIS EVENING...

SYNOPSIS...A WARM FRONT EXTENDS FROM NEAR BEMIDJI TO FARGO TO
MOBRIDGE SOUTH DAKOTA.  LOW PRESSURE WILL MOVE NORTHEAST ALONG THE
FRONT TODAY. A MOIST AND UNSTABLE AIRMASS WILL EXIST OVER THE AREA
TODAY AND THIS EVENING.  THEN AS THE SYSTEM MOVES EAST OF THE AREA
OVERNIGHT...THE THREAT FOR SEVERE WEATHER WILL END.

AREA OF CONCERN...A SLIGHT RISK OF SEVERE WEATHER WILL OCCUR EARLY
THIS MORNING NORTH OF A DEVILS LAKE TO GRAFTON TO BAUDETTE LINE.
THEN ALL OF EASTERN NORTH DAKOTA AND NORTHWEST AND WEST CENTRAL
MINNESOTA IS UNDER A SLIGHT RISK LATER THIS AFTERNOON AND EARLY
EVENING.

TIME...FROM 7 AM UNTIL 10 AM THIS MORNING...AND THEN AGAIN FROM 3 PM
UNTIL 9 PM THIS EVENING.

TYPE OF HAZARD...LARGE HAIL...DAMAGING WIND GUSTS...AND FLOODING.

RIDDLE

NNNN

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 8, 10:24 PM CDTSevere Thunderstorm WarningFGFGrand Forks36 min
Jun 8, 10:59 PM CDTSevere Thunderstorm WarningFGFCass, Traill46 min
Jun 8, 11:40 PM CDTSevere Thunderstorm WarningFGFEddy35 min
Jun 8, 11:58 PM CDTSevere Thunderstorm WarningFGFBenson, Ramsey47 min
Jun 9, 12:30 AM CDTSevere Thunderstorm WarningFGFNelson45 min
Jun 9, 12:37 AM CDTSevere Thunderstorm WarningFGFGrand Forks38 min
Jun 9, 1:10 AM CDTFlash Flood WarningFGFEddy6 hr
Jun 9, 1:18 AM CDTSevere Thunderstorm WarningFGFGriggs42 min
Jun 9, 1:45 AM CDTSevere Thunderstorm WarningFGFBenson, Ramsey45 min
Jun 9, 2:00 AM CDTSevere Thunderstorm WarningFGFGriggs, Steele45 min
Jun 9, 2:06 AM CDTFlash Flood WarningFGFGrand Forks6 hr
Jun 9, 3:34 AM CDTFlash Flood WarningFGFBenson, Nelson, Ramsey6 hr
Jun 9, 6:47 AM CDTSevere Thunderstorm WarningFGFBarnes, Cass, Ransom58 min
Jun 9, 7:15 AM CDTFlash Flood WarningFGFBarnes, Cass4 hr
Jun 9, 7:17 AM CDTFlash Flood WarningFGFBarnes, Cass4 hr
Jun 9, 11:33 AM CDTFlash Flood WarningFGFGrand Forks6 hr

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.