Alert archive / Oregon / Winter Storm Watches in 2012

Winter Storm Watch 20, NWS Medford, OR

December 21, 2012Klamath County, Lake County, Oregon; Modoc County, Siskiyou County, California

NWS Medford, OR issued this winter storm watch at Dec 21, 2012, 2:24 PM PST for Klamath County, Lake County, Oregon; Modoc County, Siskiyou County, California. It took effect at Dec 23, 2012, 4:00 AM PST. It was in force for .

The area

The counties it named.

The facts

Issued: Dec 21, 2012, 2:24 PM PST (22:24 UTC)
In effect from: Dec 23, 2012, 4:00 AM PST
Expired: Dec 22, 2012, 2:00 AM PST
In force
Issued by: NWS Medford, OR

Counties Modoc County, CA, Siskiyou County, CA, Klamath County, OR, Lake County, OR

The radar

The Medford radar (KMAX), 115 km from the middle of the area, began a volume at 22:25 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

Salem/Mcnary, OR (KSLE), launched 12:00Z, 10.4 hours before the alert went out and 335 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: 586 m above ground
0-6 km bulk shear: 92 kt
0-1 km storm-relative helicity: 196 m²/s²
0-3 km storm-relative helicity: 231 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 winter storm watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Medford, OR wrote its last area forecast discussion before this winter storm watch went out at Dec 21, 9:18 AM PST, 5 hours 6 minutes earlier.

Area forecast discussion, Dec 21, 9:18 AM PST, 5 hours 6 minutes before

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In the hours before

Local storm report, Dec 21, 10:53 AM PST, 3 hours 31 minutes before

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Local storm report, Dec 21, 10:57 AM PST, 3 hours 27 minutes before

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Local storm report, Dec 21, 11:01 AM PST, 3 hours 23 minutes before

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Local storm report, Dec 21, 11:04 AM PST, 3 hours 20 minutes before

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Local storm report, Dec 21, 11:17 AM PST, 3 hours 7 minutes before

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Local storm report, Dec 21, 11:32 AM PST, 2 hours 52 minutes before

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The office that day

Everything else NWS Medford, OR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 21, 3:09 AM PST	Gale Warning	MFR		25 hr
Dec 21, 3:11 AM PST	Winter Storm Watch	MFR	Curry, Josephine	6 hr
Dec 21, 3:11 AM PST	Winter Storm Watch	MFR	Siskiyou	11 hr

Nearby

Winter Storm Watches in Oregon, 2012 Winter Storm Watches in California, 2012 Every winter storm watch 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.