Alert archive / Montana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 29, NWS Missoula, MT

July 10, 1998Lincoln County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jul 10, 1998, 12:49 AM MDT for Lincoln County, Montana. It was in force for 66 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 10, 1998, 12:49 AM MDT (06:49 UTC)
Expired: Jul 10, 1998, 1:55 AM MDT
In force: 66 min
Issued by: NWS Missoula, MT
Area: Whole counties

County Lincoln County, MT

The radar

The Spokane radar (KOTX), 191 km from the middle of the area, began a volume at 06:41 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

Spokane, WA (KOTX), launched 00:00Z, 6.8 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1161 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 2291 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

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

338 
WUUS1 KMSO 100655 RRA
SVRMSO
MTC053-100755-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
1249 AM MDT FRI JUL 10 1998

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 155 AM MDT

* AT 1245 AM MDT...SEVERE THUNDERSTORM INDICATED 3 MILES NORTHWEST
  OF TROY...BY NATIONAL WEATHER SERVICE DOPPLER RADAR...MOVING
  NORTHEAST AT 25 MPH.

* SEVERE THUNDERSTORM WILL BE NEAR...
  YAAK AT 125 AM 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 Jul 9, 8:20 PM MDT, 4 hours 29 minutes earlier.

Area forecast discussion, Jul 9, 8:20 PM MDT, 4 hours 29 minutes before

WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
820 PM MDT THU JUL 9 1998

THUNDERSTORMS MOVING NORTH/NORTHEAST IN RESPONSE TO VORT BUT HAVE
BEEN FAIRLY TAME SO FAR. AM CONCERNED THAT THEY HAVE REALLY DEVELOPED
AROUND LWS WHERE ETA SHOWS BETTER CAPE...AND SHOWING SOME SIGNS THAT
THE CAP IS ERODING IN NORTHWEST MT TOO. WILL RAISE POPS A TAD AHEAD
OF THE STORMS BUT LEAVE THEM AT LOW END ELSEWHERE...NOT SO MUCH
BECAUSE OF MORE SHOWERS CURRENTLY UPSTREAM BUT WOULD NOT RULE OUT
REDEVELOPMENT IN THIS VERY HUMID ENVIRONMENT AND VORTS ARE HARD TO
SEE IN THIS SOUTHWEST FLOW. MSO ASOS EVEN HAD A BRIEF TOUCH AT A 70
DEGREE DEW POINT THIS EVE. WILL NOT TOUCH TEMPS TONIGHT. GV

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

LIB .. 056/086 057/081 ... 355553
FCA TW 056/084 056/078 054 355453
POL .. 061/085 060/079 ... 354453
MSO TT 058/087 059/081 056 352554
HMM .. 060/092 060/084 .. . 352455
BTM .. 050/084 052/077 ... 352455
S80 .. 060/084 059/080 ... 353543
P69 .. 063/088 061/084 ... 352543
SMN .. 059/089 057/083 ... 351455

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 5:16 PM MDT	Severe Thunderstorm Warning	MSO	Missoula	64 min
Jul 10, 5:49 PM MDT	Severe Thunderstorm Warning	MSO	Granite, Missoula	31 min

Nearby

Severe Thunderstorm Warnings in Montana, 1998 Every 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.