Alert archive / Montana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 11, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jun 18, 1998, 8:40 PM MDT for Granite County, Montana. It was in force for 50 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
- Jun 18, 1998, 8:40 PM MDT (02:40 UTC)
- Expired
- Jun 18, 1998, 9:30 PM MDT
- In force
- 50 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 02:39 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
Great_falls, MT (KTFX), launched 00:00Z, 2.7 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2162 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
515 WUUS1 KMSO 190244 RRA SVRMSO MTC039-190330- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 840 PM MDT THU JUN 18 1998 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN GRANITE COUNTY IN WEST CENTRAL MONTANA * UNTIL 930 PM MDT * AT 840 PM MDT...SEVERE THUNDERSTORM INDICATED 5 MILES SOUTHWEST OF DRUMMOND...BY NATIONAL WEATHER SERVICE DOPPLER RADAR...MOVING NORTHEAST AT 25 MPH. * SEVERE THUNDERSTORM WILL BE NEAR... DRUMMOND AT 850 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 Jun 18, 8:30 PM MDT, 10 minutes earlier.
Area forecast discussion, Jun 18, 8:30 PM MDT, 10 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 830 PM MDT THU JUN 18 1998 WHAT I CAN GLEAN FROM WOBBLY SATELLITE IMAGERY AND A FEW RAOBS LOOKS LIKE IT FITS WITH CURRENT FORECASTS. SOME CONVECTION ACROSS WEST CENTRAL MONTANA ASSOCIATED WITH DAYTIME HEATING AND INSTABILITY...AND SHEAR WITH THIS ACTIVITY HAS LED TO A SEVERAL SPLITTING CELLS PRODUCING A LOT OF PEA SIZED HAIL ACROSS SOUTHERN SECTIONS OF MONTANA HALF OF CWA. CONVECTION GOING UP NOW IN IDAHO COUNTY LOOKS LIKE IT IS FEELING THE INFLUENCES OF JET ROUNDING THE BOTTOM OF APPROACHING LOW. WITH SHEAR ALREADY DECENT...THIS JET SHOULD CONTINUE TO ENHANCE STORMS ACROSS IDAHO AND INTO SOUTHERN PARTS OF THE CWA...AND SPREAD NORTHWARD THROUGH THE NIGHT AS FLOW BACKS. CURRENT FORECASTS LOOK GOOD WITH HANDLING STORMS THROUGH THE OVERNIGHT PERIOD...AND WITHOUT ANY NEW MODEL DATA...SEE NO REASON TO CHANGE ANYTHING IN LATER PERIODS EITHER. NO UPDATE NEEDED. BARKER. ...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE... LIB .. 049/067 047/070 ... 265764 FCA WW 048/064 046/068 048 265764 POL .. 048/064 047/069 ... 265764 MSO WW 049/063 046/068 047 265775 HMM .. 050/063 045/069 ... 265775 BTM .. 045/060 040/061 ... 265885 S80 .. 049/066 047/072 ... 265532 P69 .. 050/065 047/071 ... 265532 SMN .. 047/061 043/067 ... 264443
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.