Alert archive / Washington / Freeze Warnings in 2010

Freeze Warning 2, NWS Spokane, WA

May 20, 20109 counties in Washington; 8 counties in Idaho

NWS Spokane, WA issued this freeze warning at May 20, 2010, 7:59 AM PDT for 9 counties in Washington; 8 counties in Idaho. It took effect at May 21, 2010, 3:00 AM PDT. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 20, 2010, 7:59 AM PDT (14:59 UTC)
In effect from: May 21, 2010, 3:00 AM PDT
Expired: May 21, 2010, 8:00 AM PDT
In force: 5 hr
Issued by: NWS Spokane, WA

Counties Benewah County, ID, Bonner County, ID, Boundary County, ID, Kootenai County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Shoshone County, ID, Douglas County, WA, Ferry County, WA, Grant County, WA, Lincoln County, WA, Okanogan County, WA, Pend Oreille County, WA, Spokane County, WA, Stevens County, WA, Whitman County, WA

The radar

The Spokane radar (KOTX), 9 km from the middle of the area, began a volume at 14:56 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, 3.0 hours before the alert went out and 85 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 824 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: -47 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Spokane, WA wrote its last area forecast discussion before this freeze warning went out at May 20, 4:27 AM PDT, 3 hours 32 minutes earlier.

Area forecast discussion, May 20, 4:27 AM PDT, 3 hours 32 minutes before

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Hazardous weather outlook, May 20, 5:57 AM PDT, 2 hours 2 minutes before

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In the hours before

Local storm report, May 20, 2:14 AM PDT, 5 hours 45 minutes before

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The office that day

Everything else NWS Spokane, WA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 19, 6:50 PM PDT	Special Weather Statement	OTX	Adams, Lincoln, Spokane	55 min
May 19, 7:53 PM PDT	Special Weather Statement	OTX	Ferry, Spokane, Stevens	52 min
May 19, 8:46 PM PDT	Special Weather Statement	OTX	Pend Oreille, Stevens	59 min
May 19, 9:04 PM PDT	Areal Flood Advisory	OTX	Chelan, Okanogan	4 hr

Nearby

Freeze Warnings in Washington, 2010 Freeze Warnings in Idaho, 2010 Every freeze warning in 2010

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.