Alert archive / California / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 1, NWS Eureka, CA
NWS Eureka, CA issued this severe thunderstorm warning at Feb 5, 2017, 4:54 PM PST for Humboldt County, California. It was in force for 36 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Feb 5, 2017, 4:54 PM PST (00:54 UTC)
- Expired
- Feb 5, 2017, 5:30 PM PST
- In force
- 36 min
- Issued by
- NWS Eureka, CA
- Area
- Storm-based polygon
County Humboldt County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 19 km from the middle of the area, began a volume at 00:54 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Feb 5, 5:08 PM PST | TSTM WND GST 60 | 4 S Petrolia, CA | COOSKIE MOUNTAIN RAWS, ELEVATION 2945 FEET. PEAK WIND GUST FOR THE HOURLY OBSERVATION ENDING AT 508 PM. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Medford/Jackson, OR (KMFR), launched 00:00Z, 0.9 hours before the alert went out and 259 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
- 17 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 1930 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 227 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
517
WUUS56 KEKA 060054
SVREKA
CAC023-060130-
/O.NEW.KEKA.SV.W.0001.170206T0054Z-170206T0130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Eureka CA
454 PM PST SUN FEB 5 2017
The National Weather Service in Eureka California has issued a
* Severe Thunderstorm Warning for...
Southwestern Humboldt County in northwestern California...
* Until 530 PM PST
* At 453 PM PST, Doppler radar indicated a line of severe
thunderstorms capable of producing damaging winds in excess of 60
mph. These storms were located along a line extending from 5 miles
west Cape Mendocino to 20 miles west of Shelter Cove, and moving
northeast at 45 mph.
* Locations impacted include...
Petrolia and Capetown.
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.
Torrential rainfall is also occurring with these storms, and may lead
to flash flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4050 12442 4051 12439 4040 12419 4011 12409
4000 12419 4029 12441
TIME...MOT...LOC 0053Z 206DEG 40KT 4045 12450 4015 12445 3982 12446
$$
BC1 follow-up statement
524
WWUS56 KEKA 060119
SVSEKA
Severe Weather Statement
National Weather Service Eureka CA
519 PM PST SUN FEB 5 2017
CAC023-060130-
/O.CON.KEKA.SV.W.0001.000000T0000Z-170206T0130Z/
Humboldt CA-
519 PM PST SUN FEB 5 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM PST
FOR SOUTHWESTERN HUMBOLDT COUNTY...
At 517 PM PST, Doppler radar indicated severe thunderstorms capable
of producing damaging winds in excess of 60 mph. These storms were
located along a line extending from 8 miles southwest of Fortuna,
through Petrolia to 14 miles southwest of Honeydew, moving northeast
at 40 mph.
Locations impacted include...
Petrolia and Capetown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Severe thunderstorms produce damaging winds, destructive hail, deadly
lightning and very heavy rain. For your protection move to an
interior room on the lowest floor of your home or business. Heavy
rains flood roads quickly so do not drive into areas where water
covers the road.
Torrential rainfall is also occurring with these storms, and may lead
to flash flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4050 12441 4051 12439 4040 12419 4021 12418
4015 12424 4029 12441
TIME...MOT...LOC 0117Z 209DEG 35KT 4052 12430 4037 12427 4013 12437
$$
BCThe office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 5, 5:11 PM PST | Special Weather Statement | EKA | Humboldt | 34 min |
| Feb 5, 5:38 PM PST | Special Weather Statement | EKA | Humboldt | 37 min |
| Feb 5, 10:26 PM PST | Coastal Flood Advisory | EKA | Humboldt | 11 hr |
| Feb 6, 2:57 AM PST | Small Craft Advisory | EKA | 6 hr | |
| Feb 6, 9:36 AM PST | Gale Warning | EKA | 23 hr | |
| Feb 6, 9:38 AM PST | Wind Advisory | EKA | Humboldt, Mendocino, Trinity | 25 hr |
| Feb 6, 10:45 AM PST | Flood Watch | EKA | Humboldt, Mendocino, Trinity | 20 hr |
| Feb 6, 2:45 PM PST | Small Craft Advisory | EKA | 37 hr | |
| Feb 6, 3:19 PM PST | High Wind Watch | EKA | Del Norte, Humboldt, Trinity | 23 hr |
| Feb 6, 3:20 PM PST | River Flood Watch | EKA | Humboldt | 18 hr |
| Feb 6, 3:20 PM PST | River Flood Watch | EKA | Mendocino | 14 hr |
| Feb 6, 3:32 PM PST | River Flood Advisory | EKA | Mendocino | 36 hr |
Nearby
Severe Thunderstorm Warnings in California, 2017Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.