Alert archive / California / Special Weather Statements in 2021

Special Weather Statement, NWS Sacramento, CA

May 16, 2021Alpine County, California

NWS Sacramento, CA issued this special weather statement at May 16, 2021, 4:01 PM PDT for Alpine County, California. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 16, 2021, 4:01 PM PDT (23:01 UTC)
Expired: May 16, 2021, 4:45 PM PDT
In force: 44 min
Issued by: NWS Sacramento, CA

County Alpine County, CA

The radar

The Reno radar (KRGX), 158 km from the middle of the area, began a volume at 23:04 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, 11.0 hours before the alert went out and 192 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: 15 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 858 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 109 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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The office that day

Everything else NWS Sacramento, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 15, 6:36 PM PDT	Special Weather Statement	STO	Tehama	39 min
May 15, 6:52 PM PDT	Special Weather Statement	STO	Shasta	53 min
May 15, 7:42 PM PDT	Special Weather Statement	STO	Tehama	48 min
May 16, 3:19 PM PDT	Special Weather Statement	STO	Alpine	41 min
May 16, 3:23 PM PDT	Special Weather Statement	STO	Placer	37 min

Nearby

Special Weather Statements in California, 2021 Every special weather statement in 2021

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.