Alert archive / California / Mesoscale Discussions in 2005

Mesoscale Discussion 41

January 7, 200517 counties in California; Douglas County, Nevada

The Storm Prediction Center issued this mesoscale discussion at Jan 7, 2005, 10:25 AM PST for 17 counties in California; Douglas County, Nevada. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Jan 7, 2005, 10:25 AM PST (18:25 UTC)
Expired
Jan 7, 2005, 2:30 PM PST
In force
4 hr
Issued by
the Storm Prediction Center

Counties Alpine County, CA, El Dorado County, CA, Fresno County, CA, Kern County, CA, Madera County, CA, Mariposa County, CA, Mono County, CA, Nevada County, CA, Placer County, CA, Plumas County, CA, Shasta County, CA, Sierra County, CA, Siskiyou County, CA, Sutter County, CA, Trinity County, CA, Tulare County, CA, Tuolumne County, CA, Douglas County, NV

The radar

The San Joaquin Valley radar (KHNX), 91 km from the middle of the area, began a volume at 18:29 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

Vandenberg AFB, CA (KVBG), launched 12:00Z, 6.4 hours before the alert went out and 274 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-pSkew-T log-p diagram, Vandenberg AFB, CA at 12:00Z on 2005-01-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Vandenberg AFB, CA at 12:00Z on 2005-01-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 374 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
506 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
374 m²/s²
0-3 km storm-relative helicity
692 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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.

IssuedProductOfficeCountiesLasted
Jan 7, 5:01 AM PSTMesoscale DiscussionSPCAlpine, Mariposa, Nevada, Plumas, Shasta, Sierra and 2 more5 hr

Nearby

Mesoscale Discussions in California, 2005Mesoscale Discussions in Nevada, 2005Every mesoscale discussion in 2005

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.