Alert archive / California / Heat Advisories in 2025
Heat Advisory 3, NWS Eureka, CA
NWS Eureka, CA issued this heat advisory at Aug 7, 2025, 11:53 AM PDT for Del Norte County, Humboldt County, Mendocino County, California. It took effect at Aug 10, 2025, 9:00 AM PDT. It was in force for 38 hr.
The area
The counties it named.
The facts
- Issued
- Aug 7, 2025, 11:53 AM PDT (18:53 UTC)
- In effect from
- Aug 10, 2025, 9:00 AM PDT
- Expired
- Aug 11, 2025, 11:00 PM PDT
- In force
- 38 hr
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 47 km from the middle of the area, began a volume at 18:53 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
Salem/Mcnary, OR (KSLE), launched 12:00Z, 6.9 hours before the alert went out and 481 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
- 662 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 91 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 |
|---|---|---|---|---|
| Aug 6, 10:35 PM PDT | Gale Warning | EKA | 3 days |
Nearby
Heat Advisories in California, 2025Every heat advisory in 2025
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.