Alert archive / Montana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 4, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at May 25, 1998, 3:56 PM MDT for Missoula County, Montana. It was in force for 59 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
- May 25, 1998, 3:56 PM MDT (21:56 UTC)
- Expired
- May 25, 1998, 4:55 PM MDT
- In force
- 59 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Missoula County, MT
The radar
The Missoula radar (KMSX), 5 km from the middle of the area, began a volume at 21:55 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.
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 9.9 hours before the alert went out and 201 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
- 648 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 167 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
561 WUUS1 KMSO 252159 RRA SVRMSO MTC063-252255- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 356 PM MDT MON MAY 25 1998 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL MISSOULA COUNTY IN WEST CENTRAL MONTANA * UNTIL 455 PM MDT * AT 350 PM MDT...SEVERE THUNDERSTORM INDICATED 3 MILES SOUTH OF LOLO...BY SPOTTERS...MOVING NORTH AT 20 MPH. * SEVERE THUNDERSTORM WILL BE NEAR... LOLO AT 400 PM MDT MISSOULA AT 415 PM MDT SPOTTER REPORTED 3/4 INCH HAIL IN LOLO AT 345 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 May 25, 2:25 PM MDT, 1 hour 31 minutes earlier.
Area forecast discussion, May 25, 2:25 PM MDT, 1 hour 31 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 225 PM MDT MON MAY 25 1998 UPPER LOW OVER INTO NORTHWEST...AND FRONT OVER NORTHERN ROCKIES SHOWING VERY LITTLE MOVEMENT AS EXPECTED. BEST PRECIP CHANCES OVER NORTHERN IDAHO TONIGHT...BUT RAIN WILL LIKELY SPREAD INTO WESTERN MONTANA ALSO. GOES 9 SOUNDER SHOWS AIR MASS AHEAD OF CLOUD SHIELD DESTABILIZING. BEST SHEAR PROGGED OVER SOUTHERN IDAHO THIS AFTERNOON...SO STRONGEST STORMS IN CWA LIKELY FORMING SOUTH OF CWA...THEN MOVING INTO LEMHI COUNTY AND SOUTHWEST MONTANA THROUGH THE EVENING. CONVECTION OVER REMAINDER OF NORTH CENTRAL IDAHO EXPECTED TO BE MORE OF A SHOWER ENHANCER RATHER THAN PRODUCE THUNDERSTORMS. SCATTERED CONVECTION EXPECTED IN WESTERN MONTANA IS EVENING...HOWEVER...MORE WIDESPREAD SHOWERS EXPECTED TO SPILL ACROSS BITTERROOTS AFTER MIDNIGHT. SHORT WAVE ROTATING NORTHWARD THROUGH CWA TUESDAY WILL FURTHER ENHANCE SHOWER ACTIVITY. STILL A CHANCE OF THUNDERSTORMS TUESDAY...BUT GREATEST INSTABILITY WILL BE SOUTH AND EAST OF AREA. BUILDING SURFACE HIGH PRESSURE TO OUR WEST CAUSES ENOUGH GRADIENT FOR MENTION OF WINDS TOMORROW. WILL TREND POPS DOWN BY FOURTH PERIOD AS DIGGING UPPER LOW PRODUCES RIDGING OVER FORECAST AREA. WHITMORE ...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE... LIB .. 050/063 044/063 ... 346774 FCA RC 048/063 043/063 044 345774 POL .. 052/064 045/064 ... 345763 MSO RE 048/062 040/062 045 346752 HMM .. 046/061 039/061 ... 346742 BTM .. 040/062 033/060 ... 344642 S80 .. 047/056 042/060 ... 349732 P69 .. 049/057 044/061 ... 349731 SMN .. 044/060 038/062 ... 346741
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 5:51 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 64 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; radar from the NEXRAD Level II archive.