Alert archive / California / Mesoscale Discussions in 2008

Mesoscale Discussion 7

January 4, 2008Alpine County, Tuolumne County, California

The Storm Prediction Center issued this mesoscale discussion at Jan 4, 2008, 4:39 PM PST for Alpine County, Tuolumne County, California. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jan 4, 2008, 4:39 PM PST (00:39 UTC)
Expired
Jan 4, 2008, 9:45 PM PST
In force
5 hr
Issued by
the Storm Prediction Center

Counties Alpine County, CA, Tuolumne County, CA

The radar

The San Joaquin Valley radar (KHNX), 136 km from the middle of the area, began a volume at 00:42 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 00:00Z, 0.7 hours before the alert went out and 262 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 00:00Z on 2008-01-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2008-01-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -147 square meters per square second.1939587897117136Sfc1 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
2 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
614 m above ground
0-6 km bulk shear
86 kt
0-1 km storm-relative helicity
-147 m²/s²
0-3 km storm-relative helicity
-107 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
Jan 5, 10:46 AM PSTMesoscale DiscussionSPCAlameda, Contra Costa, Marin, San Mateo, Santa Cruz119 min
Jan 5, 11:37 AM PSTMesoscale DiscussionSPCEl Dorado, Nevada, Placer, Sierra, Tuolumne5 hr

Nearby

Mesoscale Discussions in California, 2008Every mesoscale discussion in 2008

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.