Alert archive / Montana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 34, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 10, 1998, 6:54 PM MDT for Lake County, Missoula 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
- Jul 10, 1998, 6:54 PM MDT (00:54 UTC)
- Expired
- Jul 10, 1998, 7:55 PM MDT
- In force
- 61 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
Counties Lake County, MT, Missoula County, MT
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 10, 4:30 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Spokane, WA (KOTX), launched 00:00Z, 0.9 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
- 199 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 1962 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
042 WUUS1 KMSO 110055 RRA SVRMSO MTC047-063-110155- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 654 PM MDT FRI JUL 10 1998 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN LAKE COUNTY IN WEST CENTRAL MONTANA EXTREME NORTHERN MISSOULA COUNTY IN WEST CENTRAL MONTANA * UNTIL 755 PM MDT * AT 645 PM MDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM 10 MILES SOUTHWEST OF RONAN TO CONDON...MOVING NORTH AT 20 MPH. * SEVERE THUNDERSTORM WILL BE NEAR... RONAN AT 700 PM MDT CONDON AT 700 PM MDT POLSON AT 715 PM MDT DESTRUCTIVE HAIL...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 Jul 10, 2:45 PM MDT, 4 hours 9 minutes earlier.
Area forecast discussion, Jul 10, 2:45 PM MDT, 4 hours 9 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 245 PM MDT FRI JUL 10 1998 SATELLITE IMAGERY SHOWING ONE SHORT WAVE LOBE FROM SOUTHEAST WASHINGTON ACROSS WESTERN MONTANA WITH ANOTHER SHORT WAVE ENTERING SOUTHWEST IDAHO COUNTY AT THIS TIME. MOISTURE AND INCREASING INSTABILITY THIS AFTERNOON..EXPECTING AREAS OF THUNDERSTORMS ASSOCIATED WITH BOTH OF THESE SHORT WAVE FEATURES WITH ISOLATED SEVERE THUNDERSTORMS BY THIS EVENING. BEST 850-400 MB SHEAR OVER EASTERN OREGON/WASHINGTON TO SPREAD EAST OVERNIGHT AND WITH CAPE VALUES REMAINING BETWEEN 800-1000 J/KG THRU MIDNIGHT EXPECTING THUNDERSTORM TO LINGER INTO THE MORNING HOURS WITH A FEW STRONG THUNDERSTORMS. NEGATIVELY TILTING UPPER LEVEL TROUGH NOW WORKING ACROSS NORTHERN CALIFORNIA AND SOUTHWEST OREGON TO BEGIN EFFECT SOUTHWEST PORTIONS OF MISSOULA COUNTY WARNING AREA TOWARD MORNING AND THEN THRU THE REMAINDER OF THE DAY. ANOTHER NOTABLE FEATURE THAT THE MODELS AGREE ON IS A PERSISTENT AREA OF DIFFLUENCE TONIGHT AND LINGERING INTO THE MORNING OVER NORTHERN IDAHO AND NORTHWEST MONTANA..SO WILL GO HIGHER POPS AT LEAST FOR SATURDAY MORNING UP THEIR AS WELL. THE TROUGH AXIS MOVES ACROSS THE AREA BY SATURDAY EVENING WITH SCATTERED SHOWERS AND ISOLATED THUNDERSTORM LINGERING INTO THE EVENING HOURS. HIGH PRESSURE BEGINS TO RIDGE INTO THE AREA SATURDAY NIGHT HELPING STABILIZED AND DRY THE ATMOSPHERE INTO SUNDAY. TC ...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE... LIB .. 057/082 052/080 ... 296511 FCA WB 056/080 051/079 047 296521 POL .. 060/079 055/079 ... 295520 MSO WB 058/081 053/081 049 295430 HMM .. 060/082 055/080 ... 295430 BTM .. 052/076 047/075 ... 295540 S80 .. 059/079 054/079 ... 295420 P69 .. 061/083 056/082 ... 295430 SMN .. 054/084 050/082 ... 295540
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 6:02 PM MDT | Severe Thunderstorm Warning | MSO | Lake, Missoula, Sanders | 33 min |
| Jul 10, 6:16 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula | 34 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.