Alert archive / California / Heat Advisories in 2026
Heat Advisory 1, NWS Eureka, CA
NWS Eureka, CA issued this heat advisory at Jun 9, 2026, 4:48 PM PDT for Lake County, Mendocino County, California. It took effect at Jun 11, 2026, 12:00 PM PDT. It was in force for 58 hr.
The area
The counties it named.
The facts
- Issued
- Jun 9, 2026, 4:48 PM PDT (23:48 UTC)
- In effect from
- Jun 11, 2026, 12:00 PM PDT
- Expired
- Jun 13, 2026, 10:00 PM PDT
- In force
- 58 hr
- Issued by
- NWS Eureka, CA
Counties Lake County, CA, Mendocino County, CA
The radar
The Beale AFB radar (KBBX), 128 km from the middle of the area, began a volume at 23:46 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, 11.8 hours before the alert went out and 188 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 489 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 9:44 AM PDT | Red Flag Warning | EKA | Lake | 55 hr |
| Jun 9, 2:51 PM PDT | Gale Warning | EKA | 4 days |
Nearby
Heat Advisories in California, 2026Every heat advisory 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.