Alert archive / California / Special Weather Statements in 2021
Special Weather Statement, NWS Eureka, CA
NWS Eureka, CA issued this special weather statement at May 15, 2021, 3:59 PM PDT for Lake County, California. It was in force for 31 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 15, 2021, 3:59 PM PDT (22:59 UTC)
- Expired
- May 15, 2021, 4:30 PM PDT
- In force
- 31 min
- Issued by
- NWS Eureka, CA
County Lake County, CA
The radar
The Beale AFB radar (KBBX), 134 km from the middle of the area, began a volume at 23:02 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, 11.0 hours before the alert went out and 170 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
- 474 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
204 WWUS86 KEKA 152259 SPSEKA Special Weather Statement National Weather Service Eureka CA 359 PM PDT Sat May 15 2021 CAZ110-112-113-115-152330- Southwestern Mendocino Interior CA-Southern Lake County CA- Southeastern Mendocino Interior CA- Northwestern Mendocino Interior CA- 359 PM PDT Sat May 15 2021 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN MENDOCINO AND WEST CENTRAL LAKE COUNTIES UNTIL 430 PM PDT... At 358 PM PDT, Doppler radar was tracking a strong thunderstorm near Knobcone Camp, or 7 miles east of Ukiah Municipal Airport, moving southwest at 10 mph. Penny size hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Ukiah, Lakeport, Ukiah Municipal Airport, Knobcone Camp, Hopland and Talmage. PRECAUTIONARY/PREPAREDNESS ACTIONS... Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. && LAT...LON 3921 12302 3904 12292 3889 12318 3910 12332 TIME...MOT...LOC 2258Z 063DEG 10KT 3909 12307 $$ MKK
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 15, 3:33 PM PDT | Special Weather Statement | EKA | Lake | 27 min |
Nearby
Special Weather Statements in California, 2021Every 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.