Alert archive / Washington / Mesoscale Discussions in 2012
Mesoscale Discussion 1519
The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2012, 1:29 PM PDT for 8 counties in Idaho; Wallowa County, Oregon; 18 counties in Washington. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2012, 1:29 PM PDT (20:29 UTC)
- Expired
- Jul 20, 2012, 3:00 PM PDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
All 27 counties
Benewah County, ID, Bonner County, ID, Clearwater County, ID, Kootenai County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Shoshone County, ID, Wallowa County, OR, Adams County, WA, Asotin County, WA, Benton County, WA, Chelan County, WA, Columbia County, WA, Douglas County, WA, Ferry County, WA, Franklin County, WA, Garfield County, WA, Grant County, WA, Kittitas 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), 83 km from the middle of the area, began a volume at 20:28 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.
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 8.5 hours before the alert went out and 168 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
- 2619 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 9:32 AM PDT | Mesoscale Discussion | SPC | Nez Perce | 88 min |
| Jul 20, 11:38 AM PDT | Severe Thunderstorm Watch | SPC | Benewah, Bonner, Boundary, Clearwater, Idaho, Kootenai and 4 more | 7 hr |
Nearby
Mesoscale Discussions in Washington, 2012Mesoscale Discussions in Idaho, 2012Mesoscale Discussions in Oregon, 2012Every mesoscale discussion in 2012
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.