Alert archive / Montana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 50, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Aug 20, 1998, 10:19 PM MDT for Sanders County, Montana. It was in force for 61 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
- Aug 20, 1998, 10:19 PM MDT (04:19 UTC)
- Expired
- Aug 20, 1998, 11:20 PM MDT
- In force
- 61 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Sanders County, MT
The nearest sounding before it
Spokane, WA (KOTX), launched 00:00Z, 4.3 hours before the alert went out and 95 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
- 18 J/kg
- Mixed-layer CIN
- -169 J/kg
- Mixed-layer LCL
- 3285 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMSO 210419 RRA SVRMSO MTC089-210520- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 1019 PM MDT THU AUG 20 1998 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTH CENTRAL SANDERS COUNTY IN WEST CENTRAL MONTANA * UNTIL 1120 PM MDT * AT AT 1010 PM MDT...SEVERE THUNDERSTORM INDICATED 5 WEST OF THOMPSON FALLS...BY NATIONAL WEATHER SERVICE DOPPLER RADAR... MOVING NORTH AT 15 MPH. * SEVERE THUNDERSTORM WILL BE NEAR... BELKNAP AT 1025 PM MDT TROUT CREEK AT 1040 PM 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, 8:30 PM MDT, 1 hour 49 minutes earlier.
Area forecast discussion, Aug 20, 8:30 PM MDT, 1 hour 49 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 830 PM MDT THU AUG 20 1998 BUSY WITH A COUPLE OF FIRE WEATHER SPOTS AND SEVERE WEATHER STATEMENTS THIS EVENING. HAD A REPORT OF 1 INCH HAIL AT SUPERIOR MONTANA EARLIER THIS EVENING. SATELLITE WATER VAPOR AND IR INDICATING THE STRONGEST TSTM ACTIVITY OVER NORTHWEST AND SOUTHWEST MONTANA ATTM. WILL UPDATE MONTANA ZONES TO BUMP POPS UP NORTHWEST MONTANA AND KEEP MENTION OF TSTMS OVERNIGHT IN THE SOUTHWEST. FRIDAY MAX TEMPERATURES LOOK TOO COOL AS READINGS TODAY MUCH WARMER THAN EXPECTED SO NEED TO UPDATE IDAHO ZONES AS WELL. HARMER ...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE... LIB .. 052/086 048/080 ... 322221 FCA BB 049/085 045/078 044 322221 POL .. 054/083 052/076 ... 322231 MSO BB 052/086 050/080 049 322131 HMM .. 055/088 054/080 ... 322130 BTM .. 052/084 050/075 ... 322130 S80 .. 053/086 050/080 ... 321231 P69 .. 056/092 053/087 ... 322231 SMN .. 050/086 049/083 ... 322231
In the hours before
Local storm report, Aug 20, 8:15 PM MDT, 2 hours 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
815 PM MDT THU AUG 20 1998
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION......
0607 PM SUPERIOR MT 1.00 INCH HAIL
08/20/98 MINERAL WEATHER SPOTTERLocal storm report, Aug 20, 8:15 PM MDT, 2 hours 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
815 PM MDT THU AUG 20 1998
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION......
0607 PM SUPERIOR MT 1.00 INCH HAIL
08/20/98 MINERAL WEATHER SPOTTERThe office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 6:25 PM MDT | Severe Thunderstorm Warning | MSO | Sanders | 60 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.