Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 381, NWS Grand Forks, ND

September 6, 2001Polk County, Red Lake County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 6, 2001, 4:18 PM CDT for Polk County, Red Lake County, Minnesota. It was in force for 42 min. No storm report in the archive falls 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.

The facts

Issued
Sep 6, 2001, 4:18 PM CDT (21:18 UTC)
Expired
Sep 6, 2001, 5:00 PM CDT
In force
42 min
Issued by
NWS Grand Forks, ND
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Polk County, MN, Red Lake County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 70 km from the middle of the area, began a volume at 21:18 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.

IssuedProductOfficeLasted
Sep 6, 3:45 PM CDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 9.3 hours before the alert went out and 251 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-pSkew-T log-p diagram, International Fa, MN at 12:00Z on 2001-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 668 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, International Fa, MN at 12:00Z on 2001-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
668 J/kg
Mixed-layer CIN
-275 J/kg
Mixed-layer LCL
923 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
91 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.

619 
WUUS53 KFGF 062119
SVRFAR
MNC119-125-062200-

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

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  CENTRAL POLK COUNTY IN NORTHWEST MINNESOTA AND
  SOUTHWESTERN RED LAKE COUNTY IN NORTHWEST MINNESOTA.

* UNTIL 500 PM CDT.

* AT 413 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE
  LEADING EDGE OF SEVERE THUNDERSTORMS ALONG A LINE EXTENDING FROM 24
  MILES SOUTHWEST OF THIEF RIVER FALLS TO 28 MILES SOUTHEAST OF GRAND
  FORKS...MOVEMENT WAS TO THE NORTHEAST AT 10 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...

  GENTILLY AT 440 PM AND
  DELORME AT 500 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 4785 9646 4757 9682 4758 9639 4784 9608


$$
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, 26 minutes earlier.

Area forecast discussion, Sep 6, 3:52 PM CDT, 26 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 3 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.

IssuedProductOfficeCountiesLasted
Sep 6, 3:25 PM CDTSevere Thunderstorm WarningFGFMarshall, Pennington35 min
Sep 6, 5:01 PM CDTSevere Thunderstorm WarningFGFPolk, Red Lake59 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2001Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.