Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 91, NWS Grand Forks, ND

June 23, 2002Becker County, Clay County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 23, 2002, 11:49 PM CDT for Becker County, Clay County, Minnesota. It was in force for 41 min. 2 reports 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 23, 2002, 11:49 PM CDT (04:49 UTC)
Expired: Jun 24, 2002, 12:30 AM CDT
In force: 41 min
Issued by: NWS Grand Forks, ND
Area: Counties, with a storm outline in the text

Counties Becker County, MN, Clay County, MN

What was reported inside it

Time	Report	Where	Remark
Jun 24, 12:00 AM CDT	Hail 0.75	Rollag, MN
Jun 24, 12:25 AM CDT	Hail 1.25	Detroit Lakes, MN

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, 4.8 hours before the alert went out and 281 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: 3980 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 1618 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 15.7

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFGF 240449
SVRFAR
MNC005-027-240530-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
1148 PM CDT SUN JUN 23 2002

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  WESTERN BECKER COUNTY IN NORTHWEST MINNESOTA AND
  EAST CENTRAL CLAY COUNTY IN NORTHWEST MINNESOTA.

* UNTIL 1230 AM CDT.

* AT 1147 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER ROLLAG...OR ABOUT 19 MILES WEST OF DETROIT
  LAKES...MOVEMENT WAS TO THE NORTHEAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...

  LAKE PARK AT 1205 AM...
  AUDUBON AT 1210 AM...
  DETROIT LAKES AT 1220 AM AND
  RICHWOOD AT 1225 AM.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM MONDAY
MORNING FOR EASTERN NORTH DAKOTA.

LAT...LON 4678 9642 4669 9634 4684 9549 4706 9563


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 Jun 23, 8:50 PM CDT, 2 hours 59 minutes earlier.

Area forecast discussion, Jun 23, 8:50 PM CDT, 2 hours 59 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
850 PM CDT SUN JUN 23 2002

CAP MAY BE ABLE TO BREAK IN THE PATH OF STRONG THUNDERSTORM COMPLEX
NORTHEAST OF BIS ATTM...WHICH SEEMS MOSTLY LIKELY SCENARIO FOR SEVERE
STORMS OVER NORTH PART OF NEW SEVERE WATCH. SIGNIFICANT STABILITY
REMAINS FOR MUCH OF AREA BUT IS SLOWLY ERODING.

IT DOES APPEAR THAT MOST THUNDERSTORMS WILL BE OVER NORTHEAST AND
EASTERN ND NEXT COUPLE OF HOURS WHILE MORE SCATTERED FOR SOUTHEAST
CORNER OF STATE. NORTHWEST MN LOOKS CLEAR OF CONVECTION TIL AFTER
MIDNIGHT AND WILL UPDATE ZONES TO STATE THAT.

.FGF...SEVERE THUNDERSTORM WATCH EASTCENTRAL AND SOUTHEAST ND TIL 1AM
       FLOOD WATCH ENTIRE FA THROUGH MONDAY.
GV

In the hours before

Local storm report, Jun 23, 6:13 PM CDT, 5 hours 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
613 PM CDT SUN JUN 23 2002

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

0735 AM    6N MICHIGAN               ND   1.50 INCH HAIL
06/22/02   NELSON                         HAIL PUNCHED 12 HOLES IN
                                          PORCH ROOF

0805 AM    15W KENNEDY               MN   1.00 INCH HAIL
06/22/02   KITTSON

0838 AM    1/2E DONALDSON            MN   1.00 INCH HAIL
06/22/02   KITTSON

LK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 12:32 AM CDT	Severe Thunderstorm Warning	FGF	Becker	43 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.