Alert archive / Washington / Severe Thunderstorm Watches in 2014
Severe Thunderstorm Watch 459
The Storm Prediction Center issued this severe thunderstorm watch at Aug 12, 2014, 1:34 PM PDT for 10 counties in Oregon; 22 counties in Washington. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 12, 2014, 1:34 PM PDT (20:34 UTC)
- Expired
- Aug 12, 2014, 7:53 PM PDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 32 counties
Clackamas County, OR, Gilliam County, OR, Hood River County, OR, Morrow County, OR, Multnomah County, OR, Sherman County, OR, Umatilla County, OR, Union County, OR, Wallowa County, OR, Wasco County, OR, Adams County, WA, Asotin County, WA, Benton County, WA, Chelan County, WA, Clark County, WA, Columbia County, WA, Cowlitz County, WA, Douglas County, WA, Ferry County, WA, Franklin County, WA, Garfield County, WA, Grant County, WA, Kittitas County, WA, Klickitat County, WA, Lincoln County, WA, Pend Oreille County, WA, Skamania County, WA, Spokane County, WA, Stevens County, WA, Walla Walla County, WA, Whitman County, WA, Yakima County, WA
The radar
The Pendleton radar (KPDT), 121 km from the middle of the area, began a volume at 20:36 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
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 1:59 PM PDT | Severe Thunderstorm Warning | PDT | Morrow, Umatilla, Union | 61 min |
| Aug 12, 2:40 PM PDT | Severe Thunderstorm Warning | PDT | Morrow, Umatilla | 35 min |
| Aug 12, 3:07 PM PDT | Severe Thunderstorm Warning | PDT | Morrow, Umatilla | 53 min |
| Aug 12, 4:12 PM PDT | Severe Thunderstorm Warning | OTX | Adams, Asotin, Garfield, Grant, Whitman | 63 min |
| Aug 12, 4:12 PM PDT | Severe Thunderstorm Warning | PDT | Benton, Columbia, Franklin, Walla Walla, Yakima | 63 min |
| Aug 12, 5:00 PM PDT | Severe Thunderstorm Warning | OTX | Asotin, Whitman | 60 min |
| Aug 12, 5:10 PM PDT | Severe Thunderstorm Warning | OTX | Adams, Lincoln, Spokane, Whitman | 50 min |
| Aug 12, 5:35 PM PDT | Severe Thunderstorm Warning | OTX | Spokane, Whitman | 25 min |
| Aug 12, 5:49 PM PDT | Severe Thunderstorm Warning | OTX | Ferry, Lincoln, Spokane, Stevens | 56 min |
| Aug 12, 6:43 PM PDT | Severe Thunderstorm Warning | OTX | Douglas, Ferry, Grant, Lincoln, Okanogan, Stevens | 62 min |
| Aug 12, 6:58 PM PDT | Severe Thunderstorm Warning | OTX | Pend Oreille, Spokane | 62 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 8.6 hours before the alert went out and 298 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3158 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 12:57 PM PDT | Mesoscale Discussion | SPC | Gilliam, Hood River, Jefferson, Morrow, Sherman, Umatilla and 4 more | 93 min |
Nearby
Severe Thunderstorm Watches in Washington, 2014Severe Thunderstorm Watches in Oregon, 2014Every severe thunderstorm watch in 2014
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.