Alert archive / California / Mesoscale Discussions in 2003

Mesoscale Discussion 2486

November 9, 200317 counties in California

The Storm Prediction Center issued this mesoscale discussion at Nov 9, 2003, 3:27 PM PST for 17 counties in California. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Nov 9, 2003, 3:27 PM PST (23:27 UTC)
Expired
Nov 9, 2003, 5:30 PM PST
In force
2 hr
Issued by
the Storm Prediction Center

Counties Alameda County, CA, Butte County, CA, Colusa County, CA, Contra Costa County, CA, Fresno County, CA, Glenn County, CA, Madera County, CA, Merced County, CA, Sacramento County, CA, San Benito County, CA, San Joaquin County, CA, Santa Clara County, CA, Solano County, CA, Stanislaus County, CA, Sutter County, CA, Yolo County, CA, Yuba County, CA

The nearest sounding before it

Oakland, CA (KOAK), launched 12:00Z, 11.5 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-pSkew-T log-p diagram, Oakland, CA at 12:00Z on 2003-11-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 456 joules per kilogram.LCLLFCEL10008507005003002001001 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 2003-11-09The 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
456 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
726 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
147 m²/s²
0-3 km storm-relative helicity
182 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.8

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
Nov 8, 4:30 PM PSTMesoscale DiscussionSPCAmador, El Dorado, Nevada, Placer, Plumas, Sierra4 hr
Nov 9, 10:54 AM PSTMesoscale DiscussionSPCAlameda, Butte, Colusa, Contra Costa, Lake, Napa and 8 more3 hr

Nearby

Mesoscale Discussions in California, 2003Every mesoscale discussion in 2003

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.