Alert archive / California / Special Weather Statements in 2021

Special Weather Statement, NWS Eureka, CA

July 30, 2021Del Norte County, California

NWS Eureka, CA issued this special weather statement at Jul 30, 2021, 4:33 PM PDT for Del Norte County, California. It was in force for 27 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
Jul 30, 2021, 4:33 PM PDT (23:33 UTC)
Expired
Jul 30, 2021, 5:00 PM PDT
In force
27 min
Issued by
NWS Eureka, CA

County Del Norte County, CA

The radar

The Medford radar (KMAX), 73 km from the middle of the area, began a volume at 23:35 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

Medford/Jackson, OR (KMFR), launched 12:00Z, 11.6 hours before the alert went out and 79 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, Medford/Jackson, OR at 12:00Z on 2021-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 23 joules per kilogram.LCLLFCEL10008507005003002001001 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, Medford/Jackson, OR at 12:00Z on 2021-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
23 J/kg
Mixed-layer CIN
-649 J/kg
Mixed-layer LCL
2114 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
91 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

213 
WWUS86 KEKA 302333
SPSEKA

Special Weather Statement
National Weather Service Eureka CA
433 PM PDT Fri Jul 30 2021
 
CAZ102-310000-
Del Norte Interior CA-
433 PM PDT Fri Jul 30 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN DEL NORTE COUNTY
UNTIL 500 PM PDT...

At 432 PM PDT, Doppler radar was tracking a strong thunderstorm near
Takilma, or 14 miles south of Cave Junction, moving northwest at 10
mph.

Penny size hail and winds in excess of 50 mph will be possible with 
this storm.

This storm will remain over mainly rural areas of northeastern Del
Norte County.

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 4199 12353 4198 12354 4196 12353 4192 12356
      4192 12355 4191 12356 4191 12359 4188 12361
      4199 12372 4200 12370 4200 12354
TIME...MOT...LOC 2332Z 134DEG 8KT 4196 12358 

$$

JAW

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 4:13 AM PDTRed Flag WarningEKA16 hr
Jul 30, 3:43 PM PDTSpecial Weather StatementEKATrinity32 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.