Alert archive / Washington / Severe Thunderstorm Watches in 2008
Severe Thunderstorm Watch 839
The Storm Prediction Center issued this severe thunderstorm watch at Aug 18, 2008, 4:09 PM PDT for 7 counties in Idaho; 8 counties in Oregon; 16 counties in Washington. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2008, 4:09 PM PDT (23:09 UTC)
- Expired
- Aug 18, 2008, 10:49 PM PDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 31 counties
Benewah County, ID, Bonner County, ID, Boundary County, ID, Kootenai County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Crook County, OR, Gilliam County, OR, Grant County, OR, Morrow County, OR, Umatilla County, OR, Union County, OR, Wallowa County, OR, Wheeler County, OR, Adams County, WA, Asotin County, WA, Benton County, WA, Columbia County, WA, Douglas County, WA, Ferry County, WA, Franklin County, WA, Garfield County, WA, Grant County, WA, Lincoln County, WA, Okanogan County, WA, Pend Oreille County, WA, Spokane County, WA, Stevens County, WA, Walla Walla County, WA, Whitman County, WA
The radar
The Spokane radar (KOTX), 113 km from the middle of the area, began a volume at 23:08 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 4:12 PM PDT | Severe Thunderstorm Warning | PDT | Gilliam, Grant, Morrow, Umatilla | 63 min |
| Aug 18, 7:25 PM PDT | Severe Thunderstorm Warning | OTX | Asotin, Garfield | 50 min |
| Aug 18, 8:01 PM PDT | Severe Thunderstorm Warning | OTX | Latah | 44 min |
| Aug 18, 8:33 PM PDT | Severe Thunderstorm Warning | OTX | Benewah, Kootenai | 57 min |
| Aug 18, 8:57 PM PDT | Severe Thunderstorm Warning | OTX | Bonner, Kootenai | 48 min |
| Aug 18, 9:25 PM PDT | Severe Thunderstorm Warning | OTX | Bonner, Boundary, Kootenai | 50 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 1:37 PM PDT | Mesoscale Discussion | SPC | Clackamas, Crook, Deschutes, Douglas, Gilliam, Grant and 9 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Washington, 2008Severe Thunderstorm Watches in Oregon, 2008Severe Thunderstorm Watches in Idaho, 2008Every severe thunderstorm watch in 2008
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.