Alert archive / Montana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 41, NWS Billings, MT

July 4, 1998Custer County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Jul 4, 1998, 9:22 PM MDT for Custer County, Montana. It was in force for 58 min. 1 report 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 4, 1998, 9:22 PM MDT (03:22 UTC)
Expired: Jul 4, 1998, 10:20 PM MDT
In force: 58 min
Issued by: NWS Billings, MT
Area: Whole counties

County Custer County, MT

What was reported inside it

Time	Report	Where	Remark
Jul 4, 9:55 PM MDT	Hail 0.75	Miles City, MT

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 4, 8:15 PM MDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 3.4 hours before the alert went out and 232 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Billings, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 4, 8:30 PM MDT, 52 minutes earlier.

Area forecast discussion, Jul 4, 8:30 PM MDT, 52 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
830 PM MDT SAT JUL 4 1998

NO AFD TONIGHT...DUE TO CONVECTIVE WEATHER.  DIAZ

BIL BB 061/087 061/081 059 604353
LVM .. 055/078 053/074 ... 605453
HDN .. 059/089 059/084 ... 604353
MLS .. 065/090 063/083 ... 605454
4BQ .. 062/088 060/080 ... 605354
BHK .. 060/083 057/078 ... 605554
SHR BB 057/089 056/079 054 604242

The office that day

Everything else NWS Billings, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 4, 6:16 PM MDT	Severe Thunderstorm Warning	BYZ	Wheatland	59 min
Jul 4, 7:06 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	64 min
Jul 4, 7:23 PM MDT	Severe Thunderstorm Warning	BYZ	Custer	62 min
Jul 4, 8:10 PM MDT	Severe Thunderstorm Warning	BYZ	Golden Valley, Stillwater, Yellowstone	60 min
Jul 4, 8:10 PM MDT	Severe Thunderstorm Warning	BYZ	Musselshell	60 min
Jul 4, 8:21 PM MDT	Severe Thunderstorm Warning	BYZ	Custer	64 min
Jul 4, 8:34 PM MDT	Tornado Warning	BYZ	Yellowstone	31 min
Jul 4, 9:13 PM MDT	Tornado Warning	BYZ	Yellowstone	27 min
Jul 4, 9:41 PM MDT	Severe Thunderstorm Warning	BYZ	Yellowstone	59 min
Jul 4, 9:49 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	61 min
Jul 4, 9:55 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn	60 min
Jul 4, 10:24 PM MDT	Flash Flood Warning	BYZ	Custer	61 min
Jul 4, 10:24 PM MDT	Severe Thunderstorm Warning	BYZ	Custer	61 min
Jul 4, 10:49 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	61 min
Jul 4, 10:56 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Treasure	64 min
Jul 4, 11:11 PM MDT	Flash Flood Warning	BYZ	Custer	64 min
Jul 5, 4:17 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn	63 min
Jul 5, 4:45 PM MDT	Severe Thunderstorm Warning	BYZ	Powder River, Rosebud	65 min
Jul 5, 5:01 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Yellowstone	64 min
Jul 5, 5:15 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn	65 min
Jul 5, 5:26 PM MDT	Severe Thunderstorm Warning	BYZ	Powder River	64 min
Jul 5, 5:49 PM MDT	Severe Thunderstorm Warning	BYZ	Powder River	66 min
Jul 5, 5:55 PM MDT	Severe Thunderstorm Warning	BYZ	Stillwater	65 min

Nearby

Severe Thunderstorm Warnings in Montana, 1998 Every 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.