Alert archive / North Dakota / Tornado Warnings in 1998

Tornado Warning 6, NWS Grand Forks, ND

June 10, 1998Cass County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Jun 10, 1998, 8:57 PM CDT for Cass County, North Dakota. It was in force for 33 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 10, 1998, 8:57 PM CDT (01:57 UTC)
Expired
Jun 10, 1998, 9:30 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 01:56 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 nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.0 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 1998-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 263 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 00:00Z on 1998-06-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 122 square meters per square second.193958Sfc1 km3 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
263 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
1180 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
122 m²/s²
0-3 km storm-relative helicity
165 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

525 
WFUS1 KFAR 110158 RRA
TORFAR
NDC017-110230-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
857 PM CDT WED JUN 10 1998

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

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

* UNTIL 930 PM CDT

* AT 855 PM CDT RADAR INDICATED A TORNADO 5 MILES WEST OF TOWER
CITY ...OR 15 MILES EAST OF VALLEY CITY. THE STORM WAS MOVING
EAST AT 25 MPH.

* THE TORNADO WILL BE NEAR...
  TOWER CITY BY 915 PM CDT

DO NOT OUTRUN A TORNADO IN YOUR CAR.  LEAVE YOUR CAR AND GO TO A
STRONG BUILDING OR SEEK SHELTER IN A DITCH OR LOW SPOT.

KENNEDY

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 10, 7:17 PM CDTSevere Thunderstorm WarningFGFBarnes28 min
Jun 10, 7:23 PM CDTSevere Thunderstorm WarningFGFRansom, Sargent32 min
Jun 10, 7:27 PM CDTTornado WarningFGFSargent33 min
Jun 10, 7:49 PM CDTSevere Thunderstorm WarningFGFBarnes31 min
Jun 10, 7:54 PM CDTSevere Thunderstorm WarningFGFRichland31 min
Jun 10, 7:56 PM CDTSevere Thunderstorm WarningFGFCass29 min
Jun 10, 8:08 PM CDTSevere Thunderstorm WarningFGFTraill32 min
Jun 10, 8:24 PM CDTSevere Thunderstorm WarningFGFBarnes31 min
Jun 10, 8:52 PM CDTTornado WarningFGFBarnes33 min
Jun 10, 9:34 PM CDTSevere Thunderstorm WarningFGFCass31 min

Nearby

Tornado Warnings in North Dakota, 1998Every tornado warning in 1998Tornadoes in 1998

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.