Alert archive / Washington / Mesoscale Discussions in 2020
Mesoscale Discussion 768
The Storm Prediction Center issued this mesoscale discussion at May 30, 2020, 3:13 PM PDT for 7 counties in Oregon; 19 counties in Washington. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 30, 2020, 3:13 PM PDT (22:13 UTC)
- Expired
- May 30, 2020, 5:15 PM PDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 236
All 26 counties
Gilliam County, OR, Morrow County, OR, Sherman County, OR, Umatilla County, OR, Union County, OR, Wasco County, OR, Wheeler County, OR, Adams 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, Klickitat 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, Yakima County, WA
The radar
The Pendleton radar (KPDT), 51 km from the middle of the area, began a volume at 22:16 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 10.2 hours before the alert went out and 273 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
- 4 J/kg
- Mixed-layer CIN
- -470 J/kg
- Mixed-layer LCL
- 2315 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 77 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 11:20 AM PDT | Mesoscale Discussion | SPC | Crook, Deschutes, Gilliam, Grant, Hood River, Jefferson and 7 more | 115 min |
| May 30, 11:52 AM PDT | Severe Thunderstorm Watch | SPC | Crook, Deschutes, Gilliam, Grant, Harney, Jefferson and 9 more | 7 hr |
| May 30, 4:22 PM PDT | Severe Thunderstorm Watch | SPC | Adams, Asotin, Chelan, Douglas, Ferry, Garfield and 7 more | 5 hr |
Nearby
Mesoscale Discussions in Washington, 2020Mesoscale Discussions in Oregon, 2020Every mesoscale discussion in 2020
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.