Idaho, 1999

Damaging Winds in Idaho, July 20, 1999

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

More

Every storm in Idaho in 1999Every state in 1999This day in weather historyWarnings 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.