Alert archive / Oregon / Mesoscale Discussions in 2004

Mesoscale Discussion 1889

August 4, 20046 counties in Idaho; 13 counties in Oregon; 10 counties in Washington

The Storm Prediction Center issued this mesoscale discussion at Aug 4, 2004, 4:43 PM PDT for 6 counties in Idaho; 13 counties in Oregon; 10 counties in Washington. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Aug 4, 2004, 4:43 PM PDT (23:43 UTC)
Expired: Aug 4, 2004, 5:45 PM PDT
In force: 62 min
Issued by: the Storm Prediction Center

All 29 counties

Benewah County, ID, Kootenai County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Shoshone County, ID, Baker County, OR, Crook County, OR, Deschutes County, OR, Gilliam County, OR, Grant County, OR, Jefferson County, OR, Morrow County, OR, Sherman County, OR, Umatilla County, OR, Union County, OR, Wallowa County, OR, Wasco County, OR, Wheeler County, OR, Adams County, WA, Asotin County, WA, Benton County, WA, Columbia County, WA, Franklin County, WA, Garfield County, WA, Lincoln County, WA, Spokane County, WA, Walla Walla County, WA, Whitman County, WA

The radar

The Pendleton radar (KPDT), 41 km from the middle of the area, began a volume at 23:46 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, 11.7 hours before the alert went out and 252 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 18 J/kg
Mixed-layer CIN: -177 J/kg
Mixed-layer LCL: 1317 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 4, 1:03 PM PDT	Mesoscale Discussion	SPC	Shoshone	117 min
Aug 4, 12:21 PM PDT	Mesoscale Discussion	SPC	Baker, Crook, Deschutes, Gilliam, Grant, Jefferson and 8 more	114 min
Aug 4, 12:30 PM PDT	Severe Thunderstorm Watch	SPC	Crook, Deschutes, Gilliam, Grant, Jefferson, Morrow and 4 more	8 hr

Nearby

Mesoscale Discussions in Oregon, 2004 Mesoscale Discussions in Washington, 2004 Mesoscale Discussions in Idaho, 2004 Every mesoscale discussion in 2004

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.