Alert archive / Montana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 48, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Aug 20, 1998, 5:32 PM MDT for Mineral County, Montana. It was in force for 63 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
- Aug 20, 1998, 5:32 PM MDT (23:32 UTC)
- Expired
- Aug 20, 1998, 6:35 PM MDT
- In force
- 63 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Mineral County, MT
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 20, 6:07 PM MDT | Hail 1 | Superior, 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 nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 11.5 hours before the alert went out and 122 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2346 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 27 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
747 WUUS1 KMSO 202333 RRA SVRMSO MTC061-210035- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 532 PM MDT THU AUG 20 1998 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN MINERAL COUNTY IN WEST CENTRAL MONTANA * UNTIL 635 PM MDT * AT 530PM MDT...SEVERE THUNDERSTORM INDICATED 10 MILES SOUTHWEST OF ALBERTON...BY NATIONAL WEATHER SERVICE DOPPLER RADAR...MOVING NORTH 15 MPH. * SEVERE THUNDERSTORM WILL... CROSS HIGHWAY I-90 10 MILES WEST OF ALBERTON BY 545PM MDT SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH... DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
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 Missoula, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 20, 2:45 PM MDT, 2 hours 47 minutes earlier.
Area forecast discussion, Aug 20, 2:45 PM MDT, 2 hours 47 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 245 PM MDT THU AUG 20 1998 FIRE WEATHER FORECASTER WILL CONTINUE THE RED FLAG WARNING THRU THIS EVENING FOR FIRE WEATHER ZONES SOUTHERN 103B..SOUTHERN 106 AND 107B. DRY UNSTABLE ATMOSPHERE TONIGHT WITH A WEAK SHORTWAVE ROTATING NORTH THRU CENTRAL IDAHO UP INTO NORTHWEST MONTANA BY MORNING. BEST MOISTURE IF YOU CAN CALL IT THAT RESIDING OVER THE SOUTHERN HALF OF THE MISSOULA COUNTY WARNING AREA WITH INVERTED V SOUNDINGS INDICATED. UPPER LOW OVER NORTHERN CALIFORNIA BEGINS TO OPEN UP NEXT 12 TO 24 HOURS AND BEGINS TO ROTATE A TROUGH NORTHEAST OVER THE AREA BETWEEN 00Z SATURDAY AND 12Z SATURDAY MORNING. SOUNDINGS INDICATE DEEPENING MOISTURE SO WILL GO WITH CHANCE POPS BY FRIDAY EVENING...MAINLY SOUTHERN HALF. WEAK SHORTWAVE AND MOISTURE MOVES ACROSS NORTHERN PORTION OF MISSOULA COUNTY WARNING AREA SATURDAY...HOWEVER AREA WILL BE STABILIZING FOR ONLY ISOLATED ACTIVITY. TC ...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE... LIB .. 052/081 048/080 ... 291221 FCA BB 049/080 045/078 044 291221 POL .. 054/083 052/076 ... 291221 MSO BB 052/084 050/080 049 292121 HMM .. 055/085 054/080 ... 292120 BTM .. 052/080 050/075 ... 292120 S80 .. 053/082 050/080 ... 291231 P69 .. 056/090 053/087 ... 292231 SMN .. 050/086 049/083 ... 292231
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.