Alert archive / Montana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 39, NWS Missoula, MT

July 28, 1998Lincoln County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jul 28, 1998, 2:31 PM MDT for Lincoln County, Montana. It was in force for 59 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
Jul 28, 1998, 2:31 PM MDT (20:31 UTC)
Expired
Jul 28, 1998, 3:30 PM MDT
In force
59 min
Issued by
NWS Missoula, MT
Area
Whole counties

County Lincoln County, MT

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 8.5 hours before the alert went out and 119 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.

Skew-T log-pSkew-T log-p diagram, Spokane, WA at 12:00Z on 1998-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 128 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Spokane, WA at 12:00Z on 1998-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -21 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
128 J/kg
Mixed-layer CIN
-346 J/kg
Mixed-layer LCL
2575 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-21 m²/s²
0-3 km storm-relative helicity
-10 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

203 
WUUS1 KMSO 282039 RRA
SVRMSO
MTC053-282130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
231 PM MDT TUE JUL 28 1998

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN LINCOLN COUNTY IN NORTHWESTERN MONTANA

* UNTIL 330 PM MDT

* AT 230 PM MDT...A LINE OF SEVERE THUNDERSTORMS WAS INDICATED 10
  MILES WEST OF FORTINE...SOUTH TO 15 MILES EAST OF LIBBY. THESE
  STORMS WERE MOVING SLOWLY TO THE NORTHEAST AT 5 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  EUREKA AT 300 PM MDT
  FORTINE AT 300 PM MDT


THESE SEVERE THUNDERSTORMS WILL PRODUCE VERY HEAVY RAIN AND
LARGE HAIL. 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.

FELSCH

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 28, 2:15 PM MDT, 16 minutes earlier.

Area forecast discussion, Jul 28, 2:15 PM MDT, 16 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
215 PM MDT TUE JUL 28 1998

VORT LOBE ABSENT IN MODELS WHERE WATER VAPOR SHOWS OVER OREGON.
BUT IT IS BEING SHEARED WESTWARD AND WILL BE NON-FACTOR FOR CWA
EXCEPT MAYBE FOR WEST BOUNDARY OF WEST CENTRAL ID BY EVE. CONVECTION
INCREASING UNDERNEATH AND AHEAD OF THE ID PANHANDLE UPPER TROUGH
THEN MODELS SHOW DEEPEST MOISTURE RETREATING TO NEAR DIVIDE AFTER
THE TROUGH PASSES BY WED MORNING. THEY IMPLY BEST DYNAMICS BY THIS
EVE WILL BE IN SOUTHEAST B.C. AND ALSO TOWARD YELLOWSTONE. FIGURE
THE RAIN WILL END FIRST IN NORTH CENTRAL ID AND LAST FOR BTM BY
MIDNIGHT OR LATER. BUT 8H TROUGH TO SET UP TONIGHT BETWEEN MSO AND
DIVIDE AND COULD KEEP CONVECTION GOING LONGER. THIS TROUGH MIGRATES
WESTWARD WITHOUT THE EAST-OF-THE-DIVIDE MOISTURE AS THE UPPER LOW
NEAR 40N/131W MOVES ONSHORE THU. MODELS AGREE WELL THIS POINT AND
WILL NOT FIGHT IT. EASTERLY WINDS POSSIBLE ON WED NIGHT/FRI BUT
SURFACE GRADIENT QUESTIONABLE ATTM AND WILL NOT MENTION WIND. MOS/
AVN GUIDANCE NUMBERS ARE VERY CLOSE AND YESTERDAYS MOS IS VERIFYING
WELL ATTM. WILL STICK CLOSE EXCEPT WHEN PERSISTENCE LOOKS BETTER
...MAINLY FOR MIN TEMPS TONIGHT. BELIEVE SOUTHEAST WILL BE UNDER
THE GUN LONGEST BUT DO NOT THINK AN EXPANSION OF FLASH FLOOD WATCH
AREA IS NECESSARY ATTM. FLASH FLOOD WATCH ID ZONES 9-10 TIL 9PM.
URBAN/SMALL STREAM WARNING THRU EVE FOR GRANITE COUNTY MT. GV

...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE...

LIB .. 061/085 060/084 ... 355331
FCA BB 061/082 059/083 054 356431
POL .. 064/084 062/084 ... 356432
MSO BB 062/086 061/086 060 356322
HMM .. 065/087 060/088 ... 356322
BTM .. 058/8080 052/080 ... 357532
S80 .. 061/091 061/088 ... 352112
P69 .. 064/095 063/091 ... 353112
SMN .. 062/094 062/092 ... 353212

The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 28, 1:52 PM MDTSevere Thunderstorm WarningMSOLake, Missoula63 min
Jul 28, 3:26 PM MDTSevere Thunderstorm WarningMSOFlathead59 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; the sounding from the Mesonet's radiosonde archive.