Alert archive / California / Special Weather Statements in 2017

Special Weather Statement, NWS Eureka, CA

April 7, 2017Del Norte County, California

NWS Eureka, CA issued this special weather statement at Apr 7, 2017, 1:21 AM PDT 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: Apr 7, 2017, 1:21 AM PDT (08:21 UTC)
Expired: Apr 7, 2017, 1:45 AM PDT
In force: 24 min
Issued by: NWS Eureka, CA

County Del Norte County, CA

The radar

The Medford radar (KMAX), 100 km from the middle of the area, began a volume at 08:25 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 00:00Z, 8.4 hours before the alert went out and 118 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1869 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 133 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

535 
WWUS86 KEKA 070821
SPSEKA

Special Weather Statement
National Weather Service Eureka CA
121 AM PDT FRI APR 7 2017

CAZ102-105-070845-
Del Norte Interior-Northern Humboldt Interior-
121 AM PDT FRI APR 7 2017

...A SHOWER WILL AFFECT NORTH CENTRAL HUMBOLDT AND SOUTHEASTERN DEL
NORTE COUNTIES...

At 121 AM PDT, a shower was located 13 miles northwest of Weitchpec,
or 13 miles east of Orick, moving northeast at 45 mph.

Wind gusts of 50 to 55 mph and pea size hail are possible with this
shower. Ocasional lightning is possible as well. 

This shower will remain over mainly rural areas of southeastern Del
Norte Interior and north central Northern Humboldt Interior Counties.

This shower may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4178 12369 4171 12366 4167 12369 4164 12368
      4163 12370 4160 12372 4159 12368 4155 12369
      4153 12365 4148 12364 4146 12361 4143 12362
      4142 12365 4141 12364 4138 12366 4138 12363
      4124 12376 4132 12397 4179 12370
TIME...MOT...LOC 0821Z 208DEG 41KT 4135 12382 

$$

MKK

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 6, 8:19 PM PDT	Winter Weather Advisory	EKA		8 hr
Apr 7, 12:13 AM PDT	Special Weather Statement	EKA	Humboldt	32 min
Apr 7, 12:42 AM PDT	Special Weather Statement	EKA	Humboldt	33 min
Apr 7, 1:04 AM PDT	Special Weather Statement	EKA	Humboldt	26 min
Apr 7, 1:42 AM PDT	Special Weather Statement	EKA	Humboldt	33 min
Apr 7, 2:07 AM PDT	Special Weather Statement	EKA	Del Norte	23 min
Apr 7, 2:24 AM PDT	Special Weather Statement	EKA	Del Norte	36 min
Apr 7, 2:45 AM PDT	Special Weather Statement	EKA	Humboldt	30 min
Apr 7, 3:23 AM PDT	Special Weather Statement	EKA	Del Norte	22 min
Apr 7, 4:13 AM PDT	Winter Weather Advisory	EKA	Del Norte, Humboldt, Mendocino, Trinity	31 hr
Apr 7, 6:29 AM PDT	Special Weather Statement	EKA	Del Norte	16 min
Apr 7, 9:20 AM PDT	Small Craft Advisory	EKA		6 hr
Apr 7, 9:20 AM PDT	Hazardous Seas Warning	EKA		6 hr
Apr 7, 3:25 PM PDT	Small Craft Advisory	EKA		3 hr
Apr 7, 3:25 PM PDT	Hazardous Seas Warning	EKA		18 hr

Nearby

Special Weather Statements in California, 2017 Every special weather statement in 2017

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.