Alert archive / Montana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 30, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 10, 1998, 5:16 PM MDT for Missoula County, Montana. It was in force for 64 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
- Jul 10, 1998, 5:16 PM MDT (23:16 UTC)
- Expired
- Jul 10, 1998, 6:20 PM MDT
- In force
- 64 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Missoula County, MT
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 10, 5:25 PM MDT | Thunderstorm Wind 60 | Missoula, MT | |
| Jul 10, 6:15 PM MDT | Thunderstorm Wind 52 | Seeley Lake, 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 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 12:00Z, 11.3 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
- 154 J/kg
- Mixed-layer CIN
- -215 J/kg
- Mixed-layer LCL
- 1983 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, 2 hours 31 minutes earlier.
Area forecast discussion, Jul 10, 2:45 PM MDT, 2 hours 31 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, 12:49 AM MDT | Severe Thunderstorm Warning | MSO | Lincoln | 66 min |
| Jul 10, 5:49 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula | 31 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.