Alert archive / California / Mesoscale Discussions in 2008

Mesoscale Discussion 90

January 27, 2008Ventura County, California

The Storm Prediction Center issued this mesoscale discussion at Jan 27, 2008, 9:39 AM PST for Ventura County, California. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jan 27, 2008, 9:39 AM PST (17:39 UTC)
Expired: Jan 27, 2008, 11:45 AM PST
In force: 2 hr
Issued by: the Storm Prediction Center

County Ventura County, CA

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 23Jan 27, 12:50 PM PST

The nearest sounding before it

Vandenberg AFB, CA (KVBG), launched 12:00Z, 5.7 hours before the alert went out and 124 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: 2 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 528 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 216 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.

Issued	Product	Office	Counties	Lasted
Jan 27, 9:53 AM PST	Mesoscale Discussion	SPC	Siskiyou, Trinity	6 hr
Jan 27, 12:10 PM PST	Mesoscale Discussion	SPC	Fresno, Kings, Merced, Monterey, San Benito, San Luis Obispo	2 hr
Jan 27, 12:48 PM PST	Severe Thunderstorm Watch	SPC	Fresno, Kern, Kings, Los Angeles, Madera, Mariposa and 7 more	5 hr

Nearby

Mesoscale Discussions in California, 2008 Every 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.