Alert archive / California / Mesoscale Discussions in 2005

Mesoscale Discussion 2604

December 31, 200514 counties in California

The Storm Prediction Center issued this mesoscale discussion at Dec 31, 2005, 9:55 AM PST for 14 counties in California. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Dec 31, 2005, 9:55 AM PST (17:55 UTC)
Expired
Dec 31, 2005, 12:00 PM PST
In force
2 hr
Issued by
the Storm Prediction Center

Counties Amador County, CA, Butte County, CA, Calaveras County, CA, Colusa County, CA, El Dorado County, CA, Glenn County, CA, Placer County, CA, Sacramento County, CA, San Joaquin County, CA, Shasta County, CA, Sutter County, CA, Tehama County, CA, Yolo County, CA, Yuba County, CA

The radar

The Beale AFB radar (KBBX), 55 km from the middle of the area, began a volume at 17:57 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

Oakland, CA (KOAK), launched 12:00Z, 5.9 hours before the alert went out and 156 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, Oakland, CA at 12:00Z on 2005-12-31Temperature 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, Oakland, CA at 12:00Z on 2005-12-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 324 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
602 m above ground
0-6 km bulk shear
71 kt
0-1 km storm-relative helicity
324 m²/s²
0-3 km storm-relative helicity
499 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.

IssuedProductOfficeCountiesLasted
Dec 31, 10:32 AM PSTMesoscale DiscussionSPCAlpine, El Dorado, Nevada, Placer, Tuolumne5 hr

Nearby

Mesoscale Discussions in California, 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.