Alert archive / California / Mesoscale Discussions in 2023

Mesoscale Discussion 939

June 5, 20238 counties in California

The Storm Prediction Center issued this mesoscale discussion at Jun 5, 2023, 1:26 PM PDT for 8 counties in California. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 5, 2023, 1:26 PM PDT (20:26 UTC)
Expired: Jun 5, 2023, 3:30 PM PDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 5%

Counties Butte County, CA, Glenn County, CA, Lassen County, CA, Plumas County, CA, Shasta County, CA, Siskiyou County, CA, Tehama County, CA, Trinity County, CA

The radar

The Beale AFB radar (KBBX), 135 km from the middle of the area, began a volume at 20:27 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

Reno, NV (KREV), launched 12:00Z, 8.4 hours before the alert went out and 354 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2179 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 5, 4:43 PM PDT	Mesoscale Discussion	SPC	Fresno, Madera, Mariposa, Tuolumne	92 min

Nearby

Mesoscale Discussions in California, 2023 Every mesoscale discussion in 2023

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.