Alert archive / Montana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 36, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 22, 1998, 7:38 PM MDT for Mineral 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
- Jul 22, 1998, 7:38 PM MDT (01:38 UTC)
- Expired
- Jul 22, 1998, 8:25 PM MDT
- In force
- 47 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Mineral County, MT
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 22, 7:40 PM MDT | Hail 1.75 | Superior, MT | Hail to 1.75 inches in diameter fell in a thunderstorm |
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
Spokane, WA (KOTX), launched 00:00Z, 1.6 hours before the alert went out and 122 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
- 645 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 2649 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 28 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
539 WUUS1 KMSO 230141 RRA SVRMSO MTC061-230225- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 738 PM MDT WED JUL 22 1998 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL MINERAL COUNTY IN WEST CENTRAL MONTANA * UNTIL 825 PM MDT * AT 735 PM MDT...SEVERE THUNDERSTORM INDICATED 5 MILES NORTHWEST OF SUPERIOR...BY SPOTTERS...MOVING EAST AT 15 MPH. * SEVERE THUNDERSTORM WILL BE NORTH OF SUPERIOR AT 750 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. SULLIVAN/FOSS
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 22, 2:15 PM MDT, 5 hours 23 minutes earlier.
Area forecast discussion, Jul 22, 2:15 PM MDT, 5 hours 23 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 215 PM MDT WED JUL 22 1998 MAIN UPPER RIDGE ANCHORED OVER SOUTHWEST U.S. WITH THERMAL TROF AXIS OVER EASTERN WASHINGTON/OREGON AND SOUTHERN IDAHO. SATELLITE INDICATES UPPER-AIR VORTEX OVER EASTERN WASHINGTON MOVING EAST WITH 5H SHORT WAVE RIDGE OVER NORTHWEST U.S. AND SOUTHERN CANADA. LIKE DRIER ETA KEEPING DEEPER SUBTROPICAL MOISTURE SOUTH OF THE CWA. BELIEVE FORECAST AREA WILL STAY MOSTLY UNDER MID-LATITUDE UPPER FLOW ALTHOUGH SURFACE THERMAL TROF REMAIN QUITE STRONG. THICKNESS INCREASE THURSDAY SUPPORTING TROF SLIPPING EAST..WARM UP CONTINUES. NOT IN FAVOR OF AVN MOISTURE SOLUTION BRINGING DEEPER MOISTURE NORTHWARD ON FRIDAY BUT DO LIKE REESTABLISHMENT OF THERMAL TROF OVER NORTHWEST U.S. AND STRENGTHENING UPPER RIDGE ON FRIDAY KEEPING DRY AND WARM WEATHER INTO SATURDAY. STOLL LIB .. 056/091 054/090 ... 330000 FCA UU 057/089 054/090 055 330000 POL .. 058/092 058/092 ... 330000 MSO UU 058/093 057/095 058 330000 HMM .. 060/095 059/096 ... 330000 BTM .. 048/088 050/089 ... 330000 S80 .. 055/093 057/095 ... 330100 P69 .. 057/097 058/097 ... 330100 SMN .. 054/094 052/094 ... 330000
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 7:54 PM MDT | Severe Thunderstorm Warning | MSO | Sanders | 46 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.