Alert archive / North Dakota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 382, NWS Grand Forks, ND

September 6, 2001Traill County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 6, 2001, 4:30 PM CDT for Traill County, North Dakota. It was in force for 30 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Sep 6, 2001, 4:30 PM CDT (21:30 UTC)
Expired: Sep 6, 2001, 5:00 PM CDT
In force: 30 min
Issued by: NWS Grand Forks, ND
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Traill County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 30 km from the middle of the area, began a volume at 21:33 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
Sep 6, 4:40 PM CDT	Hail 0.88	Hillsboro, 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
Sep 6, 3:45 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 9.5 hours before the alert went out and 289 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: 135 J/kg
Mixed-layer CIN: -506 J/kg
Mixed-layer LCL: 1121 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 44 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.

845 
WUUS53 KFGF 062131
SVRFAR
NDC097-062200-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND-GRAND FORKS
430 PM CDT THU SEP 6 2001

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  SOUTHEASTERN TRAILL COUNTY IN SOUTHEAST NORTH DAKOTA.

* UNTIL 500 PM CDT.

* AT 428 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 2 MILES NORTHEAST OF KELSO...OR ABOUT 33 MILES
  NORTH OF FARGO...MOVEMENT WAS TO THE NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...

  CALEDONIA AT 440 PM.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM THURSDAY
EVENING FOR NORTHWESTERN MINNESOTA AND SOUTHEAST NORTH DAKOTA.

LAT...LON 4733 9717 4725 9694 4726 9687 4749 9686
          4760 9696


$$
BRAZZELL

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 Sep 6, 3:52 PM CDT, 38 minutes earlier.

Area forecast discussion, Sep 6, 3:52 PM CDT, 38 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
352 PM CDT THU SEP 6 2001

.SHORT TERM...
UPR LVL WV OVR ERN ND TO MOV E TNGT. 88D SHOWING WIDELY SCT TSRA OVR
NW COUNTIES MOVG NE. 88D ALSO SHOWING BOUNDARY MOVG S ACRS GFK
COUNTY. NEW STORMS HAVE FIRED NE OF GFK ALONG BOUNDARY. SFC WNDS
HAVE BECM NRLY OVR THE NW HALF OF THE CWFA. MESOSCALE ANLYS HAS BEST
SFC MSTR FLUX CONVERGENCE ALONG FNTL BNDRY. LIS WERE -6 TO -7 AND
PRECIPITABLE WATERS ARND 1.5 INCHES. SECOND WV OVR BC TO DIG ACRS
THE PLNS FRI AND BRING ANOTHER CHC OF PRECIP FOR FRI NGT/SAT MORN
MAINLY IN THE NRN ZONES. WATER VAPOR LOOP SHOWING A WEAK WV OVR SRN
ND. LARGER CIRC OVR WY AND IS FCST TO MOV TO THE TX PANHANDLE BY FRI
AFTN. SPC COOR FOR WATCH FOR MOSTLY MN SIDE.

.EXTENDED...

BOTH AVN AND MRF SHOW 50H VORT MOVING PAST THE AREA ON
MONDAY. 500 MB TEMPS DROP TO AROUND -24C IN NORTHERN HALF OF CWA ON
MONDAY. MRF MORE PROGRESSIVE WITH VORT THAN AVN. WILL LEAVE MONDAY
DRY FOR NOW BUT WILL HAVE TO TAKE A CLOSER LOOK AT NEXT MODEL RUNS.
MRF BRINGS ONLY WEAK 50H SHORT WAVE IN ON TUESDAY...WHICH IS
SIGNIFICANTLY DIFFERENT FROM PREVIOUS RUN BUT WILL LEAVE TSTM
MENTION IN . WEDNESDAY AND THURSDAY LOOK DRY FOR NOW BUT ECMWF AND
MRF DISAGREE ON BOUNDARY POSITION WEDNESDAY...WILL WAIT FOR LATER
RUNS BEFORE ADDING PRECIPITATION CHANCES. WILL KEEP HIGH TEMPS
AROUND 70 AND LOWS IN THE 45-55 DEGREE RANGE.

.FGF...WW 709 TIL 8 PM CDT.

HOPPES/BRIDENSTINE

In the hours before

Special weather statement, Sep 6, 1:15 PM CDT, 3 hours 15 minutes before

MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-062000-

SPECIAL WEATHER STATEMENT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
115 PM CDT THU SEP 6 2001

...THERE IS A RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF
SOUTHEAST NORTH DAKOTA AND WESTERN MINNESOTA LATE THIS AFTERNOON AND
EVENING...

SYNOPSIS...A SLOW MOVING COLD FRONT WILL ENCOUNTER A MOIST AND
MODERATELY UNSTABLE AIRMASS AS IS ADVANCES INTO EASTERN NORTH THIS
AFTERNOON...AND INTO WESTERN MINNESOTA EARLY THIS EVENING.
TEMPERATURES WILL WARM INTO THE 80S THROUGH THE AFTERNOON...AND WHEN
COMBINED WITH DEWPOINTS IN THE MIDDLE TO UPPER 60S...INSTABILITY
WILL BE MAXIMIZED ACROSS THE SOUTHERN HALF OF THE RED RIVER VALLEY.

AREA OF CONCERN...A SLIGHT RISK OF SEVERE THUNDERSTORMS EXISTS EAST
OF A HALLOCK TO COOPERSTOWN AND ELLENDALE LINE.

TIME...START AFTER 300 PM AND DIMINISH AFTER 900 PM.

TYPE OF HAZARD...MAINLY LARGE HAIL. DAMAGING WINDS WILL BE A
THREAT...AS WILL LOCALLY FLOODING RAINS FROM SLOW MOVING OR REPEAT
THUNDERSTORM EVENTS.

GUST

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 6, 5:15 PM CDT	Flash Flood Warning	FGF	Barnes	6 hr
Sep 6, 5:18 PM CDT	Severe Thunderstorm Warning	FGF	Barnes	42 min
Sep 6, 5:45 PM CDT	Severe Thunderstorm Warning	FGF	Traill	45 min
Sep 6, 6:17 PM CDT	Severe Thunderstorm Warning	FGF	Cass	28 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2001 Every severe thunderstorm warning in 2001

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.