Thunderstorm Wind, Modoc
- When
- July 13, 8:12 PM PST
- Where
- Modoc County, Alturas Muni Arpt
- Measured
- 69 kt (79 mph)
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 41.480, -120.570
See below.
Damaging Winds in California, July 13, 1999
The Klamath Falls Herald and News reported that strong winds struck Alturas around 2100 LDT on 07/13/99. The winds, probably caused by a microburst associated with a thunderstorm, damaged the roofs of the Alturas Middle School and the Alturas Municipal swimming pool.
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
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- $16,000
- Crop damage
- None recorded
- Events
- 3
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 MFR wrote it up.
The Klamath Falls Herald and News reported that strong winds struck Alturas around 2100 LDT on 07/13/99. The winds, probably caused by a microburst associated with a thunderstorm, damaged the roofs of the Alturas Middle School and the Alturas Municipal swimming pool. Numerous downed trees and power lines were also reported. Additionally, the HNX WCM reported damage that he observed when visiting Alturas. He reported that roof damage to a shed at the airport. The debris from the roof damaged a cyclone fence, and he estimated that the damaging winds were from the northwest at greater than 60 mph. This same gust broke three 4"x4" posts that were supporting a balcony at a residence 5 miles northwest of the airport. The Alturas ASOS reported a peak wind of 69 mph from 300 degrees at 2112 LDT. The two-minute average winds was 51 mph from 300 degrees.
The radar
The national radar mosaic for the moment the first event began.
Event by event
3 thunderstorm wind. Local standard time, as filed.
Thunderstorm Wind, Modoc
- When
- July 13, 9:00 PM PST
- Where
- Modoc County, Alturas
- Measured
- 60 kt (69 mph)
- Reported by
- NEWSPAPER
- Coordinates
- 41.480, -120.530
See below.
Thunderstorm Wind, Modoc
- When
- July 13, 9:20 PM PST
- Where
- Modoc County, Alturas Muni Arpt
- Measured
- 60 kt (69 mph)
- Property damage
- $16,000
- Reported by
- NWS EMPLOYEE(OFF DUTY)
- Coordinates
- 41.480, -120.570
See below.
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
- Tornado in North Dakota, July 13, 1999
- Tornado in North Dakota, July 13, 1999
- Flash Flood and Hail in California, July 13, 1999
- Flash Flood in California, July 13, 1999
- Tornadoes and Hail in North Dakota, July 13, 1999
- Tornado in North Dakota, July 13, 1999
- Flash Flood in California, July 13, 1999
- Tornado in Florida, July 13, 1999
- Hail in North Dakota, July 13, 1999
- Damaging Wind in Minnesota, July 13, 1999
- Flash Flooding and Lightning Strike in California, July 13, 1999
- Damaging Wind in Florida, July 13, 1999
More
Every storm in California in 1999Every state in 1999This day in weather historyWarnings in California, 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 2026-09-24. Each event’s entry at NCEI: 5711147, 5711145, 5711146.