Alert archive / California / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 5, NWS Eureka, CA

November 19, 2016Humboldt County, California

NWS Eureka, CA issued this severe thunderstorm warning at Nov 19, 2016, 4:10 PM PST for Humboldt County, California. It was in force for 14 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
Nov 19, 2016, 4:10 PM PST (00:10 UTC)
Expired
Nov 19, 2016, 4:24 PM PST
In force
14 min
Issued by
NWS Eureka, CA
Area
Storm-based polygon

County Humboldt County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 28 km from the middle of the area, began a volume at 00:10 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, 0.2 hours before the alert went out and 244 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 00:00Z on 2016-11-20Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Medford/Jackson, OR at 00:00Z on 2016-11-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 square meters per square second.1939587897117136Sfc1 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
1689 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
162 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

630 
WUUS56 KEKA 200010
SVREKA
CAC023-200045-
/O.NEW.KEKA.SV.W.0005.161120T0010Z-161120T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EUREKA CA
410 PM PST SAT NOV 19 2016

THE NATIONAL WEATHER SERVICE IN EUREKA CALIFORNIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN HUMBOLDT COUNTY IN NORTHWESTERN CALIFORNIA...

* UNTIL 445 PM PST

* AT 409 PM PST...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING
  WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM NEAR HONEYDEW TO 7 MILES SOUTHEAST OF PETROLIA...AND
  MOVING NORTH AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HONEYDEW...GRIZZLY CREEK REDWOODS STATE PARK...RIO DELL...SCOTIA...
  PEPPERWOOD...CARLOTTA...BULL CREEK...SHIVELY AND HYDESVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

&&

LAT...LON 4043 12381 4020 12407 4023 12426 4059 12409
TIME...MOT...LOC 0009Z 201DEG 29KT 4025 12406 4024 12419 

$$
1 follow-up statement
283 
WWUS56 KEKA 200024
SVSEKA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
424 PM PST SAT NOV 19 2016

CAC023-200033-
/O.CAN.KEKA.SV.W.0005.000000T0000Z-161120T0045Z/
HUMBOLDT CA-
424 PM PST SAT NOV 19 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN HUMBOLDT COUNTY
IS CANCELLED...
            
THE STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 4043 12381 4020 12407 4023 12426 4059 12409
TIME...MOT...LOC 0021Z 201DEG 29KT 4035 12401 4034 12414 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 19, 4:20 PM PSTSpecial Weather StatementEKA25 min
Nov 19, 11:34 PM PSTSpecial Marine WarningEKA26 min

Nearby

Severe Thunderstorm Warnings in California, 2016Every severe thunderstorm warning in 2016

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.