Alert archive / California / Mesoscale Discussions in 2014

Mesoscale Discussion 242

April 1, 201421 counties in California

The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2014, 2:43 PM PDT for 21 counties in California. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Apr 1, 2014, 2:43 PM PDT (21:43 UTC)
Expired
Apr 1, 2014, 5:15 PM PDT
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 21 counties

Alameda County, CA, Amador County, CA, Calaveras County, CA, Colusa County, CA, Contra Costa County, CA, Fresno County, CA, Kings County, CA, Madera County, CA, Mariposa County, CA, Merced County, CA, Monterey County, CA, Sacramento County, CA, San Benito County, CA, San Joaquin County, CA, San Luis Obispo County, CA, Santa Clara County, CA, Santa Cruz County, CA, Solano County, CA, Stanislaus County, CA, Sutter County, CA, Yolo County, CA

The radar

The San Francisco radar (KMUX), 53 km from the middle of the area, began a volume at 21:44 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, 9.7 hours before the alert went out and 76 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 2014-04-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 50 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 2014-04-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 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
50 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
689 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
126 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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Nearby

Mesoscale Discussions in California, 2014Every mesoscale discussion in 2014

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.