Alert archive / Montana / Tornado Watches in 1998

Tornado Watch 726

July 4, 19987 counties in Montana

The Storm Prediction Center issued this tornado watch at Jul 4, 1998, 8:15 PM MDT for 7 counties in Montana. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 4, 1998, 8:15 PM MDT (02:15 UTC)
Expired
Jul 5, 1998, 1:00 AM MDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Custer County, MT, Dawson County, MT, Fallon County, MT, McCone County, MT, Prairie County, MT, Richland County, MT, Wibaux County, MT

Warnings issued inside it

12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jul 4, 8:21 PM MDTSevere Thunderstorm WarningBYZCuster64 min
Jul 4, 8:28 PM MDTSevere Thunderstorm WarningGGWRichland62 min
Jul 4, 8:39 PM MDTSevere Thunderstorm WarningGGWMcCone66 min
Jul 4, 8:43 PM MDTSevere Thunderstorm WarningGGWPrairie62 min
Jul 4, 9:22 PM MDTSevere Thunderstorm WarningBYZCuster58 min
Jul 4, 9:22 PM MDTSevere Thunderstorm WarningGGWDawson63 min
Jul 4, 9:25 PM MDTSevere Thunderstorm WarningGGWRichland65 min
Jul 4, 9:30 PM MDTFlash Flood WarningGGWRichland5 hr
Jul 4, 10:24 PM MDTFlash Flood WarningBYZCuster61 min
Jul 4, 10:24 PM MDTSevere Thunderstorm WarningBYZCuster61 min
Jul 4, 11:11 PM MDTFlash Flood WarningBYZCuster64 min
Jul 4, 11:21 PM MDTFlash Flood WarningGGWDawson5 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.3 hours before the alert went out and 196 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, Glasgow Intl Airport, MT at 00:00Z on 1998-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2813 joules per kilogram.LCLEL10008507005003002001001 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, Glasgow Intl Airport, MT at 00:00Z on 1998-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 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
2813 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1162 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
147 m²/s²
Significant tornado parameter
1.2
Supercell composite
8.3

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.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 5, 3:00 PM MDTSevere Thunderstorm WatchSPCBroadwater, Cascade, Fergus, Gallatin, Golden Valley, Jefferson and 13 more6 hr

Nearby

Tornado Watches in Montana, 1998Every tornado watch 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.