Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 133, NWS Grand Forks, ND

July 21, 2002Wadena County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 21, 2002, 7:43 AM CDT for Wadena County, Minnesota. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 21, 2002, 7:43 AM CDT (12:43 UTC)
Expired: Jul 21, 2002, 8:15 AM CDT
In force: 32 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), 197 km from the middle of the area, began a volume at 12:47 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.

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

Minneapolis, MN (KMPX), launched 12:00Z, 0.7 hours before the alert went out and 211 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: 2410 J/kg
Mixed-layer CIN: -202 J/kg
Mixed-layer LCL: 1319 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

430 
WUUS53 KFGF 211243
SVRFAR
MNC159-211315-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
743 AM CDT SUN JUL 21 2002

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  SOUTHERN WADENA COUNTY IN CENTRAL MINNESOTA.

* UNTIL 815 AM CDT.

* AT 741 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 3 MILES NORTH OF VERNDALE...OR ABOUT 47 MILES
  SOUTHEAST OF DETROIT LAKES...MOVEMENT WAS TO THE NORTHEAST AT 40
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...

  BLUE GRASS AT 745 AM...
  NIMROD AT 750 AM AND
  OYLEN AT 755 AM.

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

LAT...LON 4656 9513 4632 9506 4659 9418 4679 9432


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 Jul 21, 2:05 AM CDT, 5 hours 38 minutes earlier.

Area forecast discussion, Jul 21, 2:05 AM CDT, 5 hours 38 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
205 AM CDT SUN JUL 21 2002

FORECAST CHALLENGE IS PRECIP THREAT TODAY...THEN TEMPS

.OVERVIEW...
MAIN SFC COLD FRONT STILL SLOWLY PUSHING INTO NORTHEAST ND THIS
AM...WITH ABUNDANT MOISTURE/INSTABILITY FROM GFK AND POINTS SOUTH
AND EAST. ONE AREA OF ELEVATED CONVECTION IN CENTRAL MN JUST EAST OF
AREA IN STRONG 850MB WARM AIR ADVECTION...ANOTHER PUSHING INTO NORTH
CENTRAL SD IN LEFT EXIT REGION OF 40KT 850MB JET AHEAD OF 500MB
SHORTWAVE MOVING INTO WESTERN DAKOTAS. MODELS STILL HAVING HARD TIME
WITH CURRENT SET UP...BUT ETA DID BEST WITH MOISTURE/INSTABILITY SO
WILL UTILIZE.

.SHORT TERM...
WILL MENTION PATCHY FOG IN ALL BUT NORTHERN ZONES THIS
MORNING...WITH ABUNDANT LOW LEVEL MOISTURE AND WEAK SFC FLOW.
MAIN 850MB FRONT AND UPPER SUPPORT MOVES THROUGH REGION
TODAY...EXPECT A ROUND OF THUNDERSTORMS ACROSS SOUTHERN 2/3 OF FA
SOUTH OF A GFK TO BJI LINE. CAPES STILL AROUND 2000J/KG FROM 12-18Z
IN FAR SOUTH...SO WOULDN/T RULE OUT AN ISOLATED SEVERE EVENT HERE
WITH NEW SLIGHT RISK AREA IN SWODY1 NEAR SOUTHEAST REGION. BEST
850MB COOLING WORKS INTO REGION THIS AFTERNOON...SO ONLY THING THAT
WILL LIMIT INSOLATION IS CLOUD COVER. EXPECT TEMPS TO BE ABOUT 5
DEGREES COOLER THAN YESTERDAY...AS DRIER AIR FILTERS INTO REGION BY
AFTERNOON.

.LONG TERM...
850MB TEMPS COOL TO AROUND +8C BY MONDAY AFTERNOON...AS DRY HIGH
PRESSURE SETTLES OVER REGION BY TUESDAY. THIS WILL MEAN TEMPS BELOW
NORMAL FOR MONDAY TUESDAY...WITH LOWS TUESDAY MORNING INTO THE UPPER
40S NORTH TO AROUND 50 SOUTH...ALMOST 20 DEGREES BELOW NORMAL.

.EXTENDED...
NO CHANGES PLANNED AT THIS TIME.

.FGF...NONE.

KELLENBENZ

In the hours before

Special weather statement, Jul 21, 7:08 AM CDT, 35 minutes before

MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-211400-

SPECIAL WEATHER STATEMENT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
708 AM CDT SUN JUL 21 2002

...SEVERE THUNDERSTORMS ARE EXPECTED ACROSS PART OF NORTHWEST
MINNESOTA THE REST OF THIS MORNING...WEAKER THUNDERSTORMS OVER
SOUTHEAST NORTH DAKOTA.

SYNOPSIS...
VERY UNSTABLE AIR WITH DEW POINTS IN THE 70S WILL REMAIN OVER
THE REGION THIS MORNING WHILE A COOL FRONT MOVES SOUTHEAST.
SEVERE THUNDERSTORMS WILL CONTINUE MOVING ACROSS PART OF THE
LAKES AREA OF NORTHWEST MINNESOTA WHILE WEAKER THUNDERSTORMS
CONTINUE THE REST OF THE MORNING OVER MUCH OF SOUTHEAST NORTH
DAKOTA AND NORTHWEST MINNESOTA.

TIME...PRESENT UNTIL ABOUT NOON.

TYPE OF HAZARD...HIGH WINDS AND POSSIBLE HAIL.

GV

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 5:48 AM CDT	Severe Thunderstorm Warning	FGF	Grant, Otter Tail, Wilkin	57 min
Jul 21, 6:45 AM CDT	Severe Thunderstorm Warning	FGF	Grant, Otter Tail, Wadena	60 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.