Damaging Winds in Idaho, July 20, 1999

Name: Damaging Winds in Idaho, July 20, 1999
Start: 1999-07-20T16:30
End: 1999-07-20T16:50
Location: Idaho

July 20, 1999 · NWS BOI · 2 events in 2 counties and zones

2 thunderstorm wind, as filed by the National Weather Service.

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

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The toll

Deaths: 0
Injuries: 3
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.

The radar

The Boise radar (KCBX), 103 km away, was scanning. The volume nearest the first event began at 23:30 UTC.

Open the radar archive at this moment

Event by event

2 thunderstorm wind. Local standard time, as filed.

Thunderstorm Wind, Washington

When: July 20, 4:30 PM MST to 4:50 PM MST
Where: Washington County, Weiser
Measured: 69 kt (79 mph)
Injuries: 3 direct, 0 indirect
Reported by: EMERGENCY MANAGER
Coordinates: 44.250, -116.970

Thunderstorm downburst winds of up to 80 mph damaged several homes and businesses in downtown Weiser. Numerous trees were downed on homes, with 2 people sustaining broken bones and a third sustaining a minor shoulder injury. The roofs of several businesses were damaged or blown off. The damaged area was two miles wide and 5 miles in length.

Thunderstorm Wind, Canyon

When: July 20, 4:30 PM MST to 4:45 PM MST
Where: Canyon County, Greenleaf
Measured: 50 kt (58 mph)
Reported by: GENERAL PUBLIC
Coordinates: 43.720, -116.830

Thunderstorm winds uprooted 2 1/2 foot diameter tree.

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.

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

The same day elsewhere

Every storm in Idaho in 1999 Every state in 1999 This day in weather history Warnings in Idaho, July 1999

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 2026-09-30. Each event’s entry at NCEI: 5713241, 5713242.