Alert archive / Minnesota / Tornado Warnings in 1994

Tornado Warning 9, NWS Grand Forks, ND

July 18, 1994Clay County, Norman County, Minnesota; Cass County, Traill County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Jul 18, 1994, 11:14 PM CDT for Clay County, Norman County, Minnesota; Cass County, Traill County, North Dakota. It was in force for 61 min.

The area

The counties it named.

The facts

Issued
Jul 18, 1994, 11:14 PM CDT (04:14 UTC)
Expired
Jul 19, 1994, 12:15 AM CDT
In force
61 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

Counties Clay County, MN, Norman County, MN, Cass County, ND, Traill County, ND

The nearest sounding before it

Aberdeen, SD (KHON), launched 00:00Z, 4.2 hours before the alert went out and 278 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 1994-07-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3480 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, Aberdeen, SD at 00:00Z on 1994-07-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 76 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
3480 J/kg
Mixed-layer CIN
-62 J/kg
Mixed-layer LCL
1575 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
76 m²/s²
0-3 km storm-relative helicity
148 m²/s²
Significant tornado parameter
0.6
Supercell composite
8.7

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.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 9:04 PM CDTSevere Thunderstorm WarningFGFLaMoure56 min
Jul 18, 9:29 PM CDTSevere Thunderstorm WarningFGFNelson61 min
Jul 18, 10:14 PM CDTSevere Thunderstorm WarningFGFGrand Forks, Steele61 min
Jul 18, 10:14 PM CDTSevere Thunderstorm WarningFGFGriggs61 min
Jul 18, 11:31 PM CDTSevere Thunderstorm WarningFGFSteele44 min

Nearby

Tornado Warnings in Minnesota, 1994Tornado Warnings in North Dakota, 1994Every tornado warning in 1994Tornadoes in 1994

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.