Alert archive / Montana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 55, NWS Great Falls, MT

July 5, 1998Liberty County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 5, 1998, 6:05 PM MDT for Liberty County, Montana. It was in force for 25 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
Jul 5, 1998, 6:05 PM MDT (00:05 UTC)
Expired
Jul 5, 1998, 6:30 PM MDT
In force
25 min
Issued by
NWS Great Falls, MT
Area
Whole counties

County Liberty County, MT

The radar

The Great Falls radar (KTFX), 125 km from the middle of the area, began a volume at 00:08 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

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 0.1 hours before the alert went out and 329 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 1998-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1916 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 1998-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -20 square meters per square second.19395878Sfc1 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
1916 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1552 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
-20 m²/s²
0-3 km storm-relative helicity
40 m²/s²
Significant tornado parameter
-0.1
Supercell composite
-1.0

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 Great Falls, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 5, 6:00 PM MDTSevere Thunderstorm WarningTFXHill60 min
Jul 5, 6:40 PM MDTSevere Thunderstorm WarningTFXChouteau65 min
Jul 5, 7:02 PM MDTSevere Thunderstorm WarningTFXHill63 min
Jul 5, 8:00 PM MDTSevere Thunderstorm WarningTFXBlaine65 min
Jul 5, 10:04 PM MDTSevere Thunderstorm WarningTFXFergus56 min
Jul 5, 10:57 PM MDTSevere Thunderstorm WarningTFXBlaine, Fergus63 min

Nearby

Severe Thunderstorm Warnings in Montana, 1998Every severe thunderstorm warning 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.