Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 166, NWS Grand Forks, ND

August 1, 2002Wadena County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 1, 2002, 12:39 AM CDT for Wadena County, Minnesota. It was in force for 36 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: Aug 1, 2002, 12:39 AM CDT (05:39 UTC)
Expired: Aug 1, 2002, 1:15 AM CDT
In force: 36 min
Issued by: NWS Grand Forks, ND
Area: Counties, with a storm outline in the text

County Wadena County, MN

The radar

The Duluth radar (KDLH), 204 km from the middle of the area, began a volume at 05:43 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
Aug 1, 12:45 AM CDT	Hail 0.75	Menahga, 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 31, 6:25 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 5.7 hours before the alert went out and 231 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: 3458 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 1318 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 142 m²/s²
0-3 km storm-relative helicity: 252 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 15.4

Open this sounding in Storm Lab

The text

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

961 
WUUS53 KFGF 010540
SVRFAR
NDC003-091-097-010630-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
1239 AM CDT THU AUG 1 2002

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  NORTHEASTERN BARNES COUNTY IN SOUTHEAST NORTH DAKOTA...
  STEELE COUNTY IN SOUTHEAST NORTH DAKOTA AND
  TRAILL COUNTY IN SOUTHEAST NORTH DAKOTA.

* UNTIL 130 AM CDT.

* AT 1238 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE
  LEADING EDGE OF SEVERE THUNDERSTORMS ALONG A LINE EXTENDING FROM 48
  MILES SOUTHWEST OF GRAND FORKS TO 27 MILES NORTHEAST OF VALLEY
  CITY...MOVEMENT WAS TO THE EAST AT 60 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...

  FINLEY AT 1240 AM...
  SHERBROOKE AT 1245 AM...
  GOLDEN LAKE AT 1250 AM AND
  ROSEVILLE AT 1255 AM.

DAMAGING WINDS...LARGE HAIL...DEADLY LIGHTNING AND TORNADOES ARE ALL
POSSIBLE IN SEVERE THUNDERSTORMS. SEEK SHELTER IN A REINFORCED
BUILDING IMMEDIATELY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM THURSDAY
MORNING FOR NORTHWESTERN MINNESOTA AND EASTERN NORTH DAKOTA.

LAT...LON 4766 9798 4717 9797 4716 9773 4726 9772
          4726 9687 4766 9690
23
NNNN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 8:29 PM CDT	Severe Thunderstorm Warning	FGF	Kittson	46 min
Jul 31, 8:51 PM CDT	Severe Thunderstorm Warning	FGF	Marshall	39 min
Jul 31, 9:46 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami	44 min
Jul 31, 10:11 PM CDT	Severe Thunderstorm Warning	FGF	Marshall, Pennington, Polk, Red Lake	49 min
Jul 31, 10:31 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami	29 min
Jul 31, 11:00 PM CDT	Severe Thunderstorm Warning	FGF	Clearwater, Polk	30 min
Aug 1, 12:00 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Hubbard	45 min
Aug 1, 1:33 AM CDT	Severe Thunderstorm Warning	FGF	Clay, Norman	42 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; radar from the NEXRAD Level II archive.