Alert archive / Montana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 45, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Aug 7, 1998, 2:33 PM MDT for Deer Lodge County, Montana. It was in force for 47 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
- Aug 7, 1998, 2:33 PM MDT (20:33 UTC)
- Expired
- Aug 7, 1998, 3:20 PM MDT
- In force
- 47 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Deer Lodge County, MT
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 7, 3:20 PM MDT | Hail 1.75 | Anaconda, 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, 8.6 hours before the alert went out and 244 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
- 70 J/kg
- Mixed-layer CIN
- -254 J/kg
- Mixed-layer LCL
- 1445 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
813 WUUS1 KMSO 072037 RRA SVRMSO MTC023-072120- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 233 PM MDT FRI AUG 7 1998 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN DEER LODGE COUNTY IN WEST CENTRAL MONTANA * UNTIL 320 PM MDT * AT 225 PM MDT...SEVERE THUNDERSTORM INDICATED 10 MILES WEST OF ANACONDA...BY NATIONAL WEATHER SERVICE DOPPLER RADAR...MOVING NORTHEAST AT 25 MPH. * SEVERE THUNDERSTORM WILL BE NEAR... STATE ROUTE 1 AT 235 PM MDT INTERSTATE 90...5 MILES NORTH OF WARM SPRINGS AT 300 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 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 Aug 7, 2:30 PM MDT, 3 minutes earlier.
Area forecast discussion, Aug 7, 2:30 PM MDT, 3 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 230 PM MDT FRI AUG 7 1998 VORT CENTER CRUISING OVER CENTRAL WASHINGTON IDENTIFIED WELL BY ETA ALONG WITH SURFACE CONVERGENCE ZONE OVER SOUTHWEST MONTANA WHERE ACTIVITY STILL GENERATING WHILE SLIPPING SOUTHEASTWARD. CONVECTIVE INSTABILITIES STILL REMAIN FAVORABLE OVER THE ENTIRE CWA FOR THIS AFTERNOON AND EVENING ISOLATED ACTIVITY...MORE SCATTERED SOUTH. BY SATURDAY MORNING...HEIGHTS START TO RISE REDEFINING AND BUILDING UPPER RIDGE OVER THE FORECAST AREA. ETA SUGGEST BEST INSTABILITY TO SHIFT EAST OF THE DIVIDE WITH DRIER AIR ADVECTING OVER CWA. TEMPERATURES TREND UPWARD FOR SUNDAY AS THERMAL TROF REDEVELOPS OVER WESTERN IDAHO. STOLL LIB .. 047/087 048/088 ... 332000 FCA UU 048/088 049/089 051 332000 POL .. 049/086 050/087 ... 332000 MSO UU 053/088 051/091 053 332000 HMM .. 055/090 054/093 ... 332000 BTM .. 048/088 047/091 ... 332100 S80 .. 053/089 054/090 ... 331000 P69 .. 055/091 054/091 ... 331000 SMN .. 049/089 048/090 ... 331000
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 12:15 AM MDT | Severe Thunderstorm Warning | MSO | Missoula, Ravalli | 60 min |
| Aug 7, 3:43 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 47 min |
| Aug 7, 4:31 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.