Alert archive / California / Mesoscale Discussions in 2011

Mesoscale Discussion 1525

July 6, 2011Imperial County, Riverside County, San Diego County, California

The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2011, 12:45 PM PDT for Imperial County, Riverside County, San Diego County, California. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 6, 2011, 12:45 PM PDT (19:45 UTC)
Expired: Jul 6, 2011, 3:15 PM PDT
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Imperial County, CA, Riverside County, CA, San Diego County, CA

The nearest sounding before it

Edwards AFB, CA (KEDW), launched 12:00Z, 7.8 hours before the alert went out and 84 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: 26 J/kg
Mixed-layer CIN: -273 J/kg
Mixed-layer LCL: 2088 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 90 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
Jul 5, 5:36 PM PDT	Mesoscale Discussion	SPC	Imperial	54 min
Jul 5, 9:28 PM PDT	Mesoscale Discussion	SPC	Imperial, Riverside	2 hr

Nearby

Mesoscale Discussions in California, 2011 Every mesoscale discussion in 2011

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.