Alert archive / Montana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 64, NWS Glasgow, MT

July 6, 1998Prairie County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 6, 1998, 4:56 PM MDT for Prairie County, Montana. It was in force for 49 min. 3 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
Jul 6, 1998, 4:56 PM MDT (22:56 UTC)
Expired
Jul 6, 1998, 5:45 PM MDT
In force
49 min
Issued by
NWS Glasgow, MT
Area
Whole counties

County Prairie County, MT

The radar

The Glasgow radar (KGGW), 176 km from the middle of the area, began a volume at 22:58 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
Jul 6, 5:06 PM MDTHail 0.75Mildred, MT
Jul 6, 5:10 PM MDTHail 1.75Terry Arpt, MT
Jul 6, 5:15 PM MDTHail 1.75Mildred, MTA severe thunderstorm produced golf ball sized hail and gusty winds. A large dead elm tree was blown down and a roof was blown off of a steel building. Several small trees were also blown down. Wheat crops in the area suffered devastating damage.

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 nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 10.9 hours before the alert went out and 356 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, Bismarck Municip, ND at 12:00Z on 1998-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 16 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, Bismarck Municip, ND at 12:00Z on 1998-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -146 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
16 J/kg
Mixed-layer CIN
-306 J/kg
Mixed-layer LCL
1386 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
-146 m²/s²
0-3 km storm-relative helicity
34 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

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 Glasgow, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 5, 6:30 PM MDTFlash Flood WarningGGWRoosevelt4 hr
Jul 5, 6:30 PM MDTFlash Flood WarningGGWRoosevelt4 hr
Jul 5, 6:43 PM MDTSevere Thunderstorm WarningGGWDaniels47 min
Jul 5, 7:21 PM MDTSevere Thunderstorm WarningGGWDaniels64 min
Jul 5, 7:26 PM MDTFlash Flood WarningGGWDaniels4 hr
Jul 5, 7:36 PM MDTSevere Thunderstorm WarningGGWRoosevelt64 min
Jul 5, 7:38 PM MDTSevere Thunderstorm WarningGGWSheridan62 min
Jul 5, 8:15 PM MDTSevere Thunderstorm WarningGGWValley65 min
Jul 5, 8:33 PM MDTSevere Thunderstorm WarningGGWRoosevelt62 min
Jul 5, 9:09 PM MDTSevere Thunderstorm WarningGGWSheridan66 min
Jul 5, 9:29 PM MDTSevere Thunderstorm WarningGGWRoosevelt46 min
Jul 5, 10:23 PM MDTFlash Flood WarningGGWRoosevelt97 min
Jul 6, 10:58 AM MDTSevere Thunderstorm WarningGGWValley62 min
Jul 6, 11:23 AM MDTSevere Thunderstorm WarningGGWMcCone62 min
Jul 6, 1:48 PM MDTSevere Thunderstorm WarningGGWValley67 min
Jul 6, 1:56 PM MDTSevere Thunderstorm WarningGGWRichland64 min
Jul 6, 2:50 PM MDTSevere Thunderstorm WarningGGWDaniels65 min
Jul 6, 3:22 PM MDTSevere Thunderstorm WarningGGWMcCone63 min
Jul 6, 3:31 PM MDTSevere Thunderstorm WarningGGWPrairie64 min
Jul 6, 3:35 PM MDTSevere Thunderstorm WarningGGWValley65 min
Jul 6, 4:02 PM MDTSevere Thunderstorm WarningGGWDawson63 min
Jul 6, 4:10 PM MDTSevere Thunderstorm WarningGGWRichland65 min
Jul 6, 4:40 PM MDTSevere Thunderstorm WarningGGWValley60 min
Jul 6, 4:44 PM MDTSevere Thunderstorm WarningGGWDawson61 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.