Alert archive / North Dakota / Tornado Warnings in 1999

Tornado Warning 45, NWS Grand Forks, ND

August 22, 1999Cass County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Aug 22, 1999, 7:12 PM CDT for Cass County, North Dakota. It was in force for 33 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 22, 1999, 7:12 PM CDT (00:12 UTC)
Expired
Aug 22, 1999, 7:45 PM CDT
In force
33 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Cass County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 66 km from the middle of the area, began a volume at 00:16 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

TimeReportWhereRemark
Aug 22, 7:30 PM CDTThunderstorm WindMapleton, NDThe wind rolled a pickup and a horse trailer off highway 18. One of the four occupants inside suffered minor glass cuts climbing out of the pickup.
Aug 22, 7:40 PM CDTTornado F0Casselton, NDA brief tornado touchdown was reported by the public.

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.

IssuedProductOfficeLasted
Aug 22, 5:15 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 0.2 hours before the alert went out and 243 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, Aberdeen, SD at 00:00Z on 1999-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 821 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 00:00Z on 1999-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 101 square meters per square second.19395878Sfc1 km3 km6 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
821 J/kg
Mixed-layer CIN
-45 J/kg
Mixed-layer LCL
2079 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
101 m²/s²
0-3 km storm-relative helicity
172 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFAR 230013 RRA
TORFAR
NDC017-230045-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
712 PM CDT SUN AUG 22 1999

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...
  WESTERN CASS COUNTY IN SOUTHEASTERN NORTH DAKOTA

* UNTIL 745 PM CDT

* AT 711 PM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A TORNADO 26 MILES EAST OF VALLEY CITY OR 6 MILES SOUTHWEST OF
  WHEATLAND... MOVING EAST AT 30 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  WHEATLAND AT 720 PM CDT
  CASSELTON AT 734 PM CDT

THIS IS A DANGEROUS STORM. IF YOU ARE IN THE PATH OF A TORNADO
ABANDON CARS AND MOBILE HOMES FOR A STURDY BUILDING.

KENNED`Y

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Aug 22, 3:30 PM CDT, 3 hours 42 minutes earlier.

Area forecast discussion, Aug 22, 3:30 PM CDT, 3 hours 42 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
330 PM CDT SUN AUG 22 1999

SHORT WV OVR SASK FCST TO MOV INTO LONG WAVE TROF OVR GRTLKS AND OH
VLY. WATER VAPOR LOOP SHOWING UPR LOW/CD POOL OVR S CNTRL SASK. ETA AND
NGM QUITE SIMILAR IN MOVG VORT MAX TO NW IL BY 48 HRS. H7 AND H8 UPR
AIR FLOW FEATURES ALSO SIMILAR. HOWEVER H8 WAA FM THE NGM SEEMS OVER
DONE WHILE ETA H8 THERMAL FIELD ORIENTATION MORE E-W. WL COMPROMISE
WITH A TONED DOWN NGM. THINK MOST ACTIVE WX TNGT WILL OCCUR OVR SW
2/3 OF CWFA IN LFQ OF JET AND NR VORT MAX. MOST STABLE AIR MOVS FM
SW CAN INTO SD TNGT AND INTO KS AND MO BY 12Z TUE. BIS MORN SNDG HAS
COOLED A LITTLE ABV H7 AND WARMED BLO OVNGT. 88D SHOWING WAA PRECIP
OVR NRN RED RVR VLY MOVG E. PRECIP IS ALSO IN A H7 TROF. AREA 88D
VAD WNDS HAVE CAA PROFILE AT KGGW, NUETRAL AT KMBX, AND WAA AT KBIS.
CLDS AND SOME SHWRS ARE XPCD TO REMAIN ON MON WITH CD POOL ALF AND
WRAP ARND TO AFFECT THE AREA. WINDIER MONDAY UNDER N FLOW. COOR WITH
ABR.

.EXTENDED...
NEW AVN/CANADIAN CONTINUE TREND TO FILL AND LIFT CUTOFF LOW MOISTURE
AND ENERGY OUT OF THE PACNW AND THROUGH THE NRN PLAINS DURING THE
EXTENDED PERIOD. MODEL INCONSISTENCY LEAVES SOME DOUBT AS TO TIMING AND
INTENSITY OF SHTWVS AS 12Z RUNS HAVE DELAYED DAY2 WAVE BY 12HRS ADDING A
POSSIBILITY OF ISOLD TSTMS ALG THE CANADIAN BORDER LATE TUES. SHORT
RANGE MODELS ARE MORE AGGRESSIVE ON SECOND WAVE PULLING OUT OF ERN OR
AT 48HRS...LEAVING MRF TIMING SUSPECT. HOWEVER...WILL STICK WITH DRY
PERIOD DAY3 FOLLOWED BY CHC TSTMS DAY4 AS PER PREVIOUS PACKAGE. ECMWF
ALSO AGREES WITH AVN/CANADIAN IN SHIFTING ENERGY FROM FIRST WAVE INTO
SECOND...WITH WAVE TIMING EARLIER ON DAY4. ECMWF ALSO LESS AMPLIFIED
THAN MRF BY DAY5. SYNOPTICS AND TRENDS WOULD SUGGEST THAT COLD PUSH
FOLLOWING SECOND WAVE WOULD LEAD TO COOLER TEMPS AND SHOWERS DAY5 FOR
MUCH OF CWFA.

.FGF...NONE.
HOPPES/GUST

In the hours before

Special weather statement, Aug 22, 3:45 PM CDT, 3 hours 27 minutes before
MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052-053-222330-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
345 PM CDT SUN AUG 22 1999

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS EASTERN NORTH
DAKOTA AND NORTHWEST MINNESOTA THIS AFTERNOON AND TONIGHT...

SYNOPSIS...A VIGOROUS UPPER LEVEL DISTURBANCE WILL MOVE INTO THE
NORTHERN PLAINS THIS AFTERNOON PUSHING A COLD FRONT INTO THE REGION.
AHEAD OF THE FRONT...A MOIST AND UNSTABLE AIRMASS IS FORECAST TO REMAIN
IN PLACE OVER EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA. AS THE FRONT
MOVES CLOSER...THUNDERSTORMS WILL DEVELOP OVER EASTERN NORTH DAKOTA
THIS AFTERNOON. THESE STORMS ARE FORECAST TO BECOME MORE WIDESPREAD BY
LATE AFTERNOON AND EVENING AS THEY MOVE INTO NORTHWEST MINNESOTA.

AREA OF CONCERN...EXTREME NORTHWEST MINNESOTA THIS AFTERNOON. ALL OF
EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA THROUGH LATE AFTERNOON AND
EVENING.

TIME...345 PM TO MIDNIGHT.

TYPE OF HAZARD...LARGE HAIL AND DAMAGING WINDS.

GUST
Special weather statement, Aug 22, 3:45 PM CDT, 3 hours 27 minutes before
MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052-053-222330-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
345 PM CDT SUN AUG 22 1999

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS EASTERN NORTH
DAKOTA AND NORTHWEST MINNESOTA THIS AFTERNOON AND TONIGHT...

SYNOPSIS...A VIGOROUS UPPER LEVEL DISTURBANCE WILL MOVE INTO THE
NORTHERN PLAINS THIS AFTERNOON PUSHING A COLD FRONT INTO THE REGION.
AHEAD OF THE FRONT...A MOIST AND UNSTABLE AIRMASS IS FORECAST TO REMAIN
IN PLACE OVER EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA. AS THE FRONT
MOVES CLOSER...THUNDERSTORMS WILL DEVELOP OVER EASTERN NORTH DAKOTA
THIS AFTERNOON. THESE STORMS ARE FORECAST TO BECOME MORE WIDESPREAD BY
LATE AFTERNOON AND EVENING AS THEY MOVE INTO NORTHWEST MINNESOTA.

AREA OF CONCERN...EXTREME NORTHWEST MINNESOTA THIS AFTERNOON. ALL OF
EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA THROUGH LATE AFTERNOON AND
EVENING.

TIME...345 PM TO MIDNIGHT.

TYPE OF HAZARD...LARGE HAIL AND DAMAGING WINDS.

GUST

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 22, 10:51 PM CDTSevere Thunderstorm WarningFGFRichland34 min

Nearby

Tornado Warnings in North Dakota, 1999Every tornado warning in 1999Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.