Alert archive / Montana / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 16, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 17, 1997, 7:00 PM MDT for Granite County, Montana. It was in force for 60 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
- Jul 17, 1997, 7:00 PM MDT (01:00 UTC)
- Expired
- Jul 17, 1997, 8:00 PM MDT
- In force
- 60 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Granite County, MT
The radar
The Missoula radar (KMSX), 82 km from the middle of the area, began a volume at 01:02 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 |
|---|---|---|---|
| Jul 17, 7:30 PM MDT | Hail 1 | Philipsburg, 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 00:00Z, 1.0 hours before the alert went out and 246 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
- 17 J/kg
- Mixed-layer CIN
- -104 J/kg
- Mixed-layer LCL
- 1361 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 44 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 180102 RRA SVRMSO MTC039-180200- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 700 PM MDT THU JUL 17 1997 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 800 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN WEST CENTRAL MONTANA ...SOUTHERN GRANITE COUNTY AT 700 PM MDT...MISSOULA DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 20 MILES EAST-SOUTHEAST OF HAMILTON ALONG THE GRANITE AND RAVALLI COUNTY BORDER. THIS STORM IS MOVING TO THE EAST AT 30 MPH AND WILL CONTINUE TO MOVE ACROSS THE SAPPHIRE MOUNTAINS AND DEER LODGE NATIONAL FOREST. THIS STORM IS EXPECTED TO MOVE INTO THE GEORGETOWN LAKE AREA...SOUTH OF PHILIPSBURG BY 745 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 DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. BELTZ
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 17, 1:56 PM MDT, 5 hours 4 minutes earlier.
Area forecast discussion, Jul 17, 1:56 PM MDT, 5 hours 4 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 145 PM MDT THU JUL 17 1997 WEST COAST TROF TO MOVE ACROSS REGION TOMORROW. MINOR DIFFERENCES BETWEEN MODELS WITH TRACK VORT CENTERS. HOWEVER...DYNAMICS APPEAR WEAK WITH LITTLE IN THE WAY OF OMEGA GENERATED. MAIN VORT CENTER AT BOTTOM OF TROF GOES THRU NORTHERN CALIF/NV BEFORE SWING NORTH INTO SW MT LATE FRIDAY AFTERNOON/EVENING. MODELS HAVE DRIER AIR MASS FOR TOMORROW AS SUB-TROPICAL MOISTURE MOVES EDVD. PRIMARY AREA FOR ANY ACTIVITY ON FRIDAY IS OVER SW MT WHERE MOISTURE CONVERGENCE...LOW LI'S AND CAPES CONVERGE. HAVE GONE SLIGHTLY HIGHER THAN MOS POPS MOST AREAS FRIDAY...MAINLY DUE TO TROF PASSAGE. FOR THIS EVENING STILL PLENTY OF MOISTURE AROUND ALTHOUGH SATELLITE IMAGERY BEGINNING TO SHOW BREAK IN CLOUDS. WILL KEEP SCATTERED POPS AND CHANCE OF A FEW TSTMS THRU THE EVENING HOURS. FOSS ...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE... LIB .. 052/076 050/082 ... 313211 FCA BB 050/075 048/080 047 313211 POL .. 055/079 053/084 ... 313211 MSO BB 055/079 052/082 050 313211 HMM .. 053/080 050/085 ... 313211 BTM .. 053/075 050/078 ... 313341 S80 .. 055/076 053/080 ...@ 313310 P69 .. 057/080 055/084 ... 313310 SMN .. 054/076 050/085 ... 313321
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 6:12 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 48 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.