Alert archive / Montana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 51, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Aug 22, 1998, 1:37 AM MDT for Lake County, Missoula County, Montana. It was in force for 58 min. 2 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
- Aug 22, 1998, 1:37 AM MDT (07:37 UTC)
- Expired
- Aug 22, 1998, 2:35 AM MDT
- In force
- 58 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
Counties Lake County, MT, Missoula County, MT
The radar
The Missoula radar (KMSX), 33 km from the middle of the area, began a volume at 07:39 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 22, 1:40 AM MDT | Hail 0.75 | (Mso)Missoula Intl A, MT | |
| Aug 22, 1:45 AM MDT | Thunderstorm Wind 50 | Arlee, 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 00:00Z, 7.6 hours before the alert went out and 184 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
- 385 J/kg
- Mixed-layer CIN
- -104 J/kg
- Mixed-layer LCL
- 2636 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 2 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 220736 RRA SVRMSO MTC047-063-220835- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 137 AM MDT SAT AUG 22 1998 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EXTREME SOUTHERN LAKE COUNTY IN WEST CENTRAL MONTANA CENTRAL MISSOULA COUNTY IN WEST CENTRAL MONTANA * UNTIL 235 AM MDT * AT 130 AM MDT...SEVERE THUNDERSTORM INDICATED 5 MILES WEST OF MISSOULA...BY NATIONAL WEATHER SERVICE DOPPLER RADAR...MOVING NORTHEAST AT 20 MPH. * SEVERE THUNDERSTORM WILL BE NEAR... DOWNTOWN MISSOULA AT 140 AM MDT EVARO AT 145 AM MDT ARLEE AT 150 AM MDT HAIL TO 3/4 INCH OBSERVED AT MISSOULA AIRPORT DESTRUCTIVE H~AIL...DAMAGING WINDS...DEADLY LIGHTNING...AND VERY HEAVY RAIN ARE ALL LIKELY WITH THIS STORM. FOR YOUR PROTECTION... MOVE INSIDE A STRONG BUILDING...AND STAY AWAY FROM WINDOWS. 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 21, 8:30 PM MDT, 5 hours 7 minutes earlier.
Area forecast discussion, Aug 21, 8:30 PM MDT, 5 hours 7 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 830 PM MDT FRI AUG 21 1998 UPPER LEVEL TROF OVER THE PACIFIC NORTHWEST ROTATING A FEW VORT MAXES THROUGH IDAHO AND WESTERN MONTANA THIS EVENING. THERMAL TROF OVER THE ZONES WILL SHIFT INTO EASTERN MONTANA ON SATURDAY...HOWEVER AIR MASS REMAINS MOIST AND UNSTABLE THROUGH FORECAST PERIOD FOR MONTANA ZONES. WOULD NOT BE SURPRISED TO SEE ISOLATED AFTERNOON TSTMS DEVELOP IN THESE ZONES AGAIN ON SATURDAY. WILL LOWER POPS AT BTM AND SMN AS TSTM ACTIVITY PUSHES NORTHEAST OVERNIGHT. ON THE OTHER HAND...STILL A WEAK BOUNDARY ZONE OVER CENTRAL IDAHO SO HAVE BUMP POPS UP SLIGHTLY AT S80 AND P69. PLAN ON UPDATE. HARMER ...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE... LIB .. 047/080 047/080 ... 323202 FCA BB 049/083 048/081 051 323202 POL .. 054/082 055/081 ... 323101 MSO AB 051/085 052/082 053 322101 HMM .. 053/086 053/084 ... 322101 BTM .. 046/082 050/081 ... 324101 S80 .. 052/084 052/083 ... 322001 P69 .. 052/088 053/086 ... 322001 SMN .. 049/083 049/082 ... 321001
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.