Alert archive / Idaho / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 35, NWS Missoula, MT

July 11, 1998Idaho County, Idaho

NWS Missoula, MT issued this severe thunderstorm warning at Jul 11, 1998, 12:16 AM PDT for Idaho County, Idaho. It was in force for 44 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 11, 1998, 12:16 AM PDT (07:16 UTC)
Expired: Jul 11, 1998, 1:00 AM PDT
In force: 44 min
Issued by: NWS Missoula, MT
Area: Whole counties

County Idaho County, ID

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 7.3 hours before the alert went out and 218 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: 199 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1962 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 97 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.

000 
TTAA00 KMSO 110718 RRA
SVRMSO
IDC049-110800-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
116 AM MDT (1216 AM PDT) SAT JUL 11 1998

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN AND WEST CENTRAL IDAHO COUNTY IN CENTRAL IDAHO

* UNTIL 100 AM PDT (200 AM MDT)

* AT 1210 PDT...SEVERE THUNDERSTORM INDICATED 5 MILES SOUTHWEST OF
  COTTONWOOD...BY NATIONAL WEATHER SERVICE DOPPLER RADAR...MOVING
  NORTHEAST AT 25 MPH.

* SEVERE THUNDERSTORM WILL BE NEAR...
  COTTONWOOD AT 1225 AM PDT


SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FO|R 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 10, 7:10 PM PDT, 5 hours 6 minutes earlier.

Area forecast discussion, Jul 10, 7:10 PM PDT, 5 hours 6 minutes before

WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
810 PM MDT FRI JUL 10 1998

SHORTWAVE RESPONSIBLE FOR THE SEVERE TSTM WATCH IS MOVING NORTH AND
TSTMS SEEM TO BE STABILIZING AIR MASS IN THEIR WAKE...AND WILL KEEP
AROUND 20 PCT CATEGORY POPS WHERE IT HAS. WEST OF DIVIDE PORTION OF
MT WATCH APPEARS ALMOST RUN ITS COURSE. IDAHO AND EXTREME NORTHWEST
MT APPARENTLY UNDER THE GUN REST OF TONIGHT AS STRONG TSTMS CURRENTLY
MOVING INTO NORTH CENTRAL ID IN RESPONSE TO VORT. ETA SHOWS THAT VORT
ONLY TO NORTHWEST MT BY 12Z SAT. WILL UPDATE ZONES...NORTH CENTRAL
ID PORTION MAINLY TO FIX TEMP/POP PORTION AS IT IS PARTLY CUT OFF.
GV

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

LIB .. 057/082 052/080 ... 354511
FCA WB 056/080 051/079 047 353521
POL .. 060/079 055/079 ... 352520
MSO WB 058/081 053/081 049 352430
HMM .. 060/082 055/080 ... 352430
BTM .. 052/076 047/075 ... 352540
S8p0 .. 059/079 054/079 ... 355420
P69 .. 061/083 056/082 ... 355430
SMN .. 054/084 050/082 ... 352540

In the hours before

Local storm report, Jul 10, 8:30 PM PDT, 3 hours 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
930 PM MDT FRI JUL 10 1998

TIME(MST)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION......

 410 PM    DARBY                     MT    WIND DAMAGE
07/10/98   RAVALLI                         STRUCTURAL DAMAGE INSIDE
                                           HOUSE AS WIND CAUSED
                                           STRESS ON ITS ROOF

 420 PM    LOLO PASS                 ID    WIND DAMAGE
07/10/98   IDAHO                           MANY TREES BLOWN DOWN FROM
                                           LOLO PASS TO 18 MILES TO
                                           WEST

 425 PM    MISSOULA                  MT    55 MPH TSTM GUST
07/10/98   MISSOULA

 428 PM    MISSOULA                  MT    61 MPH TSTM GUST
07/10/98   MISSOULA                        ROOF BLOWN OFF FIRE LAB
                                           AT SMOKEJUMPER CENTER.
                                           WIND RECORDED AT MISSOULA
                                           AIRPORT

 430 PM    FRENCHTOWN                MT    *** 1 DEAD ***
07/10/98   MISSOULA                        TSTM WINDS CAUSE TREE TO
                                           FALL ON MAN. UNCONFIRMED
                                           REPORT THAT HE DIED

 430 PM    MISSOULA                  MT    WIND DAMAGE
07/10/98   MISSOULA                        HOUSE TRAILER 1/2 MILE
                                           NORTH OF INTERSTATE 90
                                           EXIT 96 BLOWN ON ITS SIDE

 445 PM    MISSOULA                  MT    69 MPH TSTM GUST
07/10/98   MISSOULA

 450 PM    CLINTON                   MT    55 MPH TSTM GUST
07/10/98   MISSOULA

 455 PM    HAMILTON                  MT    68 MPH TSTM GUST
07/10/98   RAVALLI

 458 PM    ARLEE                     MT    WIND DAMAGE
07/10/98   LAKE                            ESTIMATED 60-70 MPH WIND
                                           GUST BLEW AN ELM TREE DOWN
                                           WIITH 4 INCH DIAMETER
                                           LIMBS BROKEN OFF OTHER
                                           TREES

 615 PM    POLSON                    MT    WIND DAMAGE
07/10/98   LAKE                            ESTIMATED GUSTS OVER 60
                                           MPH CAUSED TREES DOWN AND
                                           LOST ROOFS. BLEW AN AWNING
                                           OFF A PORCH
*****************************************r*************************
GV

Local storm report, Jul 10, 8:30 PM PDT, 3 hours 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
930 PM MDT FRI JUL 10 1998

TIME(MST)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION......

 410 PM    DARBY                     MT    WIND DAMAGE
07/10/98   RAVALLI                         STRUCTURAL DAMAGE INSIDE
                                           HOUSE AS WIND CAUSED
                                           STRESS ON ITS ROOF

 420 PM    LOLO PASS                 ID    WIND DAMAGE
07/10/98   IDAHO                           MANY TREES BLOWN DOWN FROM
                                           LOLO PASS TO 18 MILES TO
                                           WEST

 425 PM    MISSOULA                  MT    55 MPH TSTM GUST
07/10/98   MISSOULA

 428 PM    MISSOULA                  MT    61 MPH TSTM GUST
07/10/98   MISSOULA                        ROOF BLOWN OFF FIRE LAB
                                           AT SMOKEJUMPER CENTER.
                                           WIND RECORDED AT MISSOULA
                                           AIRPORT

 430 PM    FRENCHTOWN                MT    *** 1 DEAD ***
07/10/98   MISSOULA                        TSTM WINDS CAUSE TREE TO
                                           FALL ON MAN. UNCONFIRMED
                                           REPORT THAT HE DIED

 430 PM    MISSOULA                  MT    WIND DAMAGE
07/10/98   MISSOULA                        HOUSE TRAILER 1/2 MILE
                                           NORTH OF INTERSTATE 90
                                           EXIT 96 BLOWN ON ITS SIDE

 445 PM    MISSOULA                  MT    69 MPH TSTM GUST
07/10/98   MISSOULA

 450 PM    CLINTON                   MT    55 MPH TSTM GUST
07/10/98   MISSOULA

 455 PM    HAMILTON                  MT    68 MPH TSTM GUST
07/10/98   RAVALLI

 458 PM    ARLEE                     MT    WIND DAMAGE
07/10/98   LAKE                            ESTIMATED 60-70 MPH WIND
                                           GUST BLEW AN ELM TREE DOWN
                                           WIITH 4 INCH DIAMETER
                                           LIMBS BROKEN OFF OTHER
                                           TREES

 615 PM    POLSON                    MT    WIND DAMAGE
07/10/98   LAKE                            ESTIMATED GUSTS OVER 60
                                           MPH CAUSED TREES DOWN AND
                                           LOST ROOFS. BLEW AN AWNING
                                           OFF A PORCH
*****************************************r*************************
GV

Nearby

Severe Thunderstorm Warnings in Idaho, 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.