Alert archive / California / Red Flag Warnings in 2026

Red Flag Warning 3, NWS Sacramento, CA

June 18, 2026Shasta County, California

NWS Sacramento, CA issued this red flag warning at Jun 18, 2026, 7:56 PM PDT for Shasta County, California. It took effect at Jun 19, 2026, 5:00 AM PDT. It was in force for 14 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 18, 2026, 7:56 PM PDT (02:56 UTC)
In effect from
Jun 19, 2026, 5:00 AM PDT
Expired
Jun 19, 2026, 7:00 PM PDT
In force
14 hr
Issued by
NWS Sacramento, CA

County Shasta County, CA

The radar

The Beale AFB radar (KBBX), 145 km from the middle of the area, began a volume at 02:59 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 00:00Z, 2.9 hours before the alert went out and 352 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, Reno, NV at 00:00Z on 2026-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Reno, NV at 00:00Z on 2026-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -18 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
5362 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
-18 m²/s²
0-3 km storm-relative helicity
-14 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 7:01 PM PDTSpecial Weather StatementSTOEl Dorado29 min
Jun 18, 8:04 PM PDTSevere Thunderstorm WarningSTONevada, Placer26 min
Jun 18, 8:33 PM PDTSpecial Weather StatementSTOSierra27 min
Jun 18, 9:02 PM PDTSpecial Weather StatementSTOSierra28 min

Nearby

Red Flag Warnings in California, 2026Every red flag warning in 2026

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.