Alert archive / Montana / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 10, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jun 4, 1997, 5:21 PM MDT for Powell County, Montana. It was in force for 54 min. 1 report 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
- Jun 4, 1997, 5:21 PM MDT (23:21 UTC)
- Expired
- Jun 4, 1997, 6:15 PM MDT
- In force
- 54 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Powell County, MT
The radar
The Missoula radar (KMSX), 82 km from the middle of the area, began a volume at 23:20 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 |
|---|---|---|---|
| Jun 4, 5:40 PM MDT | Hail 1.25 | Garrison, 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
Great_falls, MT (KTFX), launched 12:00Z, 11.4 hours before the alert went out and 189 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
- 1725 J/kg
- Mixed-layer CIN
- -119 J/kg
- Mixed-layer LCL
- 899 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 84 m²/s²
- 0-3 km storm-relative helicity
- 118 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 Jun 4, 1:56 PM MDT, 3 hours 25 minutes earlier.
Area forecast discussion, Jun 4, 1:56 PM MDT, 3 hours 25 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 145 PM MDT WED JUN 4 1997 MONTANA HYDRO...FLOOD WATCH MT ZN2-3...FLOOD WARNING MT ZN4>6. IDAHO HYDRO...FLOOD WARNING SALMON RIVER IN LEMHI COUNTY. UPPER LOW OFF B.C COAST MOVING LITTLE AS STRONG JET ON BACK SIDE OF TROUGH DIGGING TROUGH FURTHER DOWN CALIFORNIA COAST. PREFER NGM INITIALLY SINCE HAS BEST POSITION OF VORT MAX NORTHWEST OF SFO...WHICH MOVES INTO OUR AREA THURSDAY AFTERNOON. IN THE INTERIM...RIGHT REAR QUAD OF JET DEVELOPS STRONG OMEGA OVER CENTRAL IDAHO WHICH PUSHES NORTH INTO NORTHWEST MONTANA OVERNIGHT. THE STRONG OMEGA MAINTAINS OVER NORTH CENTRAL IDAHO WHICH SPELLS CONTINUAL SHOWERS. IT WILL BE INTERESTING TO SEE IF DEVELOPING SURFACE LOW AS FORECAST BY NGM IN SOUTHEAST OREGON PANS OUT. AFTER 30 HOURS ETA IS PREFERRED SINCE IT IS SLOWER TO MOVE TROUGH THROUGH WHICH IS SIMILAR TO AVN...WHEREAS NGM TOO FAST WITH TROUGH AND DRYING/CLEARING AREA OUT...NOTED BY TOO COLD LOW TEMPS THURSDAY NIGHT. THURSDAY NIGHT INTO THE WEEKEND TROUGH BEGINS TO BROADEN WITH SERIES OF WAVES PUSHES THROUGH AREA...DRIER FRIDAY ...THUS LOWER SCATTERED POPS. OTHERWISE JUST A CHANCE OF SHOWERS AND/OR THUNDERSTORMS OVER THE WEEKEND. BELTZ ...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE... LIB .. 053/063 050/065 ... 277754 FCA WE 055/064 050/066 048 277754 POL .. 055/067 051/067 ... 277754 MSO WE 053/065 049/070 048 277754 HNMM .. 052/065 047/072 ... 277754 BTM .. 052/063 045/067 ... 277654 S80 .. 050/062 049/071 ... 278854 P69 .. 052/060 050/072 ... 279954 SMN .. 052/065 049/073 ... 277544
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 4, 5:38 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 37 min |
Nearby
Severe Thunderstorm Warnings in Montana, 1997Every severe thunderstorm warning in 1997
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.