Hail and Damaging Wind in Idaho, August 29, 2002

Name: Hail and Damaging Wind in Idaho, August 29, 2002
Start: 2002-08-29T17:30
End: 2002-08-29T18:00
Location: Idaho

August 29, 2002 · NWS MSO · 2 events in 1 county or zone

A severe thunderstorm moved northeast of Salmon and through Gibbonsville, producing large hail and strong winds. No damage was reported with this event.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 2

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS MSO wrote it up.

A severe thunderstorm moved northeast of Salmon and through Gibbonsville, producing large hail and strong winds. No damage was reported with this event.

What forecasters said that day

The local office's own words before the first event, 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 the first event at Aug 29, 1:40 PM MST, 3 hours 50 minutes earlier.

Area forecast discussion, Aug 29, 1:40 PM MST, 3 hours 50 minutes before

WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
240 PM MDT THU AUG 29 2002

.SHORT TERM...RATHER ACTIVE EVENING FOR THUNDERSTORMS AHEAD. ID
UPPER LOW OPENING UP AND MOVING EAST. WIND SHEAR REMAINS WEAK
TONIGHT...BUT THE AIR MASS HAS WARMED NICELY OVER WESTERN MT AND
TROUGH WILL PROVIDE ADDITIONAL COOLING ALOFT TO HELP UPDRAFTS. MAIN
PROBLEMS WILL BE HEAVY RAIN DUE TO WEAK STORM MOTION AND POSSIBILITY
OF HAIL IN STRONGER PULSING CELLS. ACTIVITY OVER NORTHWEST MT
CURRENTLY SHOWING VERY LITTLE MOVEMENT AND MAY BECOME SIGNIFICANT IF
STORMS DEVELOP NEAR LAST YEARS MOOSE FIRE. GOES TPW VALUES IN THIS
AREA RUNNING >0.75 INCH. CYCLONIC PART OF TROUGH REMAINS OVER THE CWA
OVERNIGHT AND COULD SEE NOCTURNAL STORMS LINGERING THROUGH 12Z.
EXPECT VERY LITTLE BREAK BETWEEN SYSTEMS AS THE NEXT TROUGH ENTERS
THE PAC NORTHWEST FRIDAY. SOUTHWEST FLOW ALOFT AND RESIDUAL LOW-LEVEL
MOISTURE WILL HELP MORE CONVECTION DEVELOP IN THE AFTERNOON. AVN
SHOWS THIS TROUGH AXIS VERY SLOW TO MOVE ACROSS WESTERN MT THROUGH
SATURDAY AND IS PREFERRED SOLUTION. WILL CONTINUE WITH ISOLATED TO
SCATTERED ACTIVITY BUT SHIFT THINGS TOWARD THE DIVIDE SATURDAY
AFTERNOON/EVENING. PATTERN CHANGE IS POSSIBLE LATER IN THE WEEKEND AS
A STRONG NORTHWEST JET PUSHES ACROSS SOUTHWEST CANADA AND A COLD
FRONT ENTERS MT BY SUNDAY AFTERNOON. EXPECT SOME MOISTURE TO BRING
SHOWERS TO NORTHWEST MT WITH INCREASED CLOUDS ELSEWHERE. BOLDT

.LONG TERM...MONDAY THROUGH TUESDAY MORNING LOOK TO BE DRY IN A WEST
TO NORTHWEST FLOW ALOFT. TUESDAY AN UPPER LEVEL TROUGH BEGINS TO DIG
IN OFF THE WEST COAST AND AN APPROACHING COLD FRONT/JET CLIPS THE
WESTERN IDAHO ZONES AND NORTHWEST MONTANA FOR A SLIGHT CHANCE OF
SHOWERS INTO WEDNESDAY MORNING. WEDNESDAY AND THURSDAY THE TROUGH
CONTINUES TO DIG IN PLACING THE AREA IN A SOUTHWEST FLOW ALOFT FOR
A SLIGHT CHANCE OF AFTERNOON/EVENING SHOWERS AND THUNDERSTORMS.
TEMPERATURES WILL RISE SLIGHTLY TUESDAY WITH SOME WEAK SHORTWAVE
RIDGING THEN COOL SLIGHTLY ON WEDNESDAY. THURSDAY TEMPS LOOK TO FALL
OFF AROUND 5 DEGREES AS THE AREA COMES MORE UNDER THE INFLUENCE OF
THE UPPER LEVEL TROUGH. GILCHRIST

.MSO...NONE.

...7-DAY SPOT TEMPS AND POPS...
LIB EBB 050/080 050/078 046/077 28422103
     BBUB 046/075 045/077 044/076 041/071 3310011202
FCA EBB 047/076 047/074 043/073 28322212
     BBBB 043/073 043/074 042/073 039/068 3310001202
POL EBB 052/072 054/070 049/076 28322211
     BBEB 049/074 048/076 047/075 044/070 3300001202
MSO BBB 050/078 050/077 047/077 28323310
     BBEB 045/076 045/077 045/076 042/071 3300000202
HMM BBB 054/077 056/076 047/076 28323310
     BBBB 045/075 046/076 046/075 043/070 3300000202
BTM BBB 043/072 043/071 040/075 28424410
     BBUB 041/073 040/074 042/072 037/068 3300000202
ORO BBB 059/084 058/085 055/086 28321100
     BBEB 054/082 054/082 053/081 050/078 3300011202
GRV BBB 055/078 053/080 051/081 28322100
     BBEB 049/077 050/077 049/076 046/073 3300011202
SMN BBB 047/077 047/076 044/078 28424410
     BBUB 044/075 043/078 044/076 041/073 3300000202

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 thunderstorm wind, 1 hail. Local standard time, as filed.

Thunderstorm Wind, Lemhi

When: August 29, 5:30 PM MST to 6:00 PM MST
Where: Lemhi County, 7 mi NE of Salmon
Measured: 59 kt (68 mph)
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 45.233, -113.800

Hail, Lemhi

When: August 29, 5:30 PM MST to 6:00 PM MST
Where: Lemhi County, Gibbonsville
Measured: 0.75 in hail
Reported by: TRAINED SPOTTER
Coordinates: 45.550, -113.933

What these are

Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Idaho in 2002 Every state in 2002 This day in weather history Warnings in Idaho, August 2002

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5313933, 5313934.