Alert archive / Minnesota / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 84, NWS Grand Forks, ND

June 9, 1999Grant County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 9, 1999, 7:18 PM CDT for Grant 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 counties it named.

The facts

Issued: Jun 9, 1999, 7:18 PM CDT (00:18 UTC)
Expired: Jun 9, 1999, 7:50 PM CDT
In force: 32 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

County Grant County, MN

The radar

The Aberdeen radar (KABR), 194 km from the middle of the area, began a volume at 00:21 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.

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 9, 3:15 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.3 hours before the alert went out and 224 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: 19 J/kg
Mixed-layer CIN: -250 J/kg
Mixed-layer LCL: 1362 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, 2:30 PM CDT, 4 hours 48 minutes earlier.

Area forecast discussion, Jun 9, 2:30 PM CDT, 4 hours 48 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
230 PM CDT WED JUN 09 1999

MAIN FCST CHALLENGE...CONVECTION POSSIBILITIES EARLY THIS EVENING.

.SHORT TERM....
SFC LOW LOCATED NR THE ND/MN/SD BORDER WITH WARM FRONT EAST TO NR A
DTL-PKD LINE. MAIN BOUNDARY FOR INTIAL SVR CONVECTION HAS MOVED EAST
AND WAS LOCATED FROM SOUTH OF AXN INTO NW IA.  MAIN FRONT LOCATED
FURTHER WEST IN ERN SD.  ATMOS IN FAR SE CWFA...FFM AREA...VERY
UNSTABLE WITH MODIFIED CAPES BASED ON CURRENT T/TD AT FFM ABV 4000.
ADAP SHOWS LI -10 AND NO CAP.  WITH FRONT STILL NOT THROUGH THINK ISOLD
SVR PSBL THIS EVENING AND WILL CARRY PSBL SVR IN ZONES FOR PKD-DTL
SOUTH.

OTHERWISE...COLD FRONT/TROUGH EXTENDS NORTH FROM SFC LOW INTO FAR NW MN
AND THIS IS SLOWLY MOVING EAST. 88D SHOWS NUMEROUS SHOWERS AHEAD OF 70H
TROF IN ERN ND AND EXPECT THESE TO SLOWLY MOVE EAST AND END EARLY THIS
EVENING IN ND AND BY MIDNIGHT IN NW MN.  WILL LEAVE DVL ZONE DRY TONIGHT
AS BIS 88D SHOWS PCPN SHOULD BE EAST OF AREA SHORTLY.

.LONGER TERM...
WILL USE ETA/AVN THIS FCST PACKAGE.  50H VORT MAX MOVES ENE THRU ND
INTO MB TONIGHT...BRINGING IN DRIER AIR FROM WEST TO EAST OVERNIGHT
CLEARING SKIES.  WILL NOTICE LOWER DEW PTS ON THURSDAYS AS HIGH
PRESSURE MOVES INTO WRN ND.  A FEW CU ON THURSDAY....O/W MSTLY SUNNY.
FWC/FAN MOS IN CLOSE AGREEMENT WITH MOSTLY MID 70S TO AROUND 80.

NEXT 50H SYSTEM TO TRAVEL SOUTH OF CWFA...WITH SFC LOW DEVELOPMENT IN
KS ON FRIDAY.  HOWEVER...70H LOW FURTHER NORTH IN SD...SO DO EXPECT AN
INCREASE IN MID LEVEL MOISTURE ON FRIDAY SPLY SOUTH CWFA.  SHOULD BE DRY
THRU FRIDAY AFTERNOON WITH PCPN REMAINING TO OUR SOUTH.

.EXTENDED...LONG RANGE MODELS SIMILAR AND CONSISTENT IN BRUSHING CWFA
WITH POSSIBLE PCPN ON FRIDAY NIGHT AS SHORTWAVE MOVES THROUGH. SHORTWAVE
PULLS FAR ENOUGH EAST BY SAT MORNING THAT NO PCPN EXPECTED FOR SAT. WITH
500 MB RIDGE BUILDING OVER ROCKIES AND SFC HIGH PRESSURE OVER CWFA...NO
PCPN EXPECTED FOR SUN AND MON. WILL NEED TO WATCH APPROACHING SHORTWAVE
FOR MONDAY NIGHT AS COULD PROVIDE ENOUGH LIFT TO GET PCPN GOING.
HOWEVER...WILL NOT MENTION IN EXTENDED AT THIS TIME. TEMPS REMAIN
FAIRLY CONS"ISTENT THROUGH THE EXTENDED -- HOLDING RIGHT AROUND NORMAL.

.FGF...NONE.

RIDDLE/NG

In the hours before

Local storm report, Jun 9, 6:41 PM CDT, 37 minutes before

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Nearby

Severe Thunderstorm Warnings in Minnesota, 1999 Every severe thunderstorm warning in 1999

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.