Alert archive / California / Special Weather Statements in 2018

Special Weather Statement, NWS Eureka, CA

March 1, 2018Del Norte County, California

NWS Eureka, CA issued this special weather statement at Mar 1, 2018, 9:21 AM PST for Del Norte County, California. It was in force for 24 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
Mar 1, 2018, 9:21 AM PST (17:21 UTC)
Expired
Mar 1, 2018, 9:45 AM PST
In force
24 min
Issued by
NWS Eureka, CA

County Del Norte County, CA

The radar

The Medford radar (KMAX), 114 km from the middle of the area, began a volume at 17:23 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, 5.4 hours before the alert went out and 119 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 2018-03-01Temperature 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, Medford/Jackson, OR at 12:00Z on 2018-03-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 116 square meters per square second.1939587897Sfc1 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
569 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
116 m²/s²
0-3 km storm-relative helicity
267 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

207 
WWUS86 KEKA 011721
SPSEKA

Special Weather Statement
National Weather Service Eureka CA
921 AM PST THU MAR 1 2018
 
CAZ101-102-011745-
Del Norte Interior CA-Coastal Del Norte CA-
921 AM PST THU MAR 1 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN DEL NORTE COUNTY
UNTIL 945 AM...

At 920 AM PST, Doppler radar was tracking a thunderstorm over 
Jedediah Smith State Park, moving northeast at 35 mph. This storm is 
likely producing accumulating small hail.  Motorists should remain 
alert for slippery roads.

Locations impacted include...
Crescent City, Jedediah Smith State Park, Jack McNamera Field, Smith
River, Gasquet, Bertsch-Oceanview, Crescent City North and Fort Dick.

LAT...LON 4199 12371 4195 12364 4157 12407 4175 12432
      4178 12429 4178 12426 4179 12424 4188 12421
      4200 12411
TIME...MOT...LOC 1720Z 210DEG 39KT 4174 12410 

$$

SEC

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 1, 2:41 AM PSTSmall Craft AdvisoryEKA3 days
Mar 1, 2:53 AM PSTWinter Weather AdvisoryEKADel Norte, Humboldt, Mendocino35 hr
Mar 1, 2:09 PM PSTBeach Hazards StatementEKADel Norte, Humboldt, Mendocino32 hr

Nearby

Special Weather Statements in California, 2018Every special weather statement in 2018

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.