Alert archive / California / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 5, NWS Eureka, CA
NWS Eureka, CA issued this severe thunderstorm warning at Dec 10, 2015, 12:09 PM PST for Humboldt County, California. It was in force for 21 min. 6 reports 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
- Dec 10, 2015, 12:09 PM PST (20:09 UTC)
- Expired
- Dec 10, 2015, 12:30 PM PST
- In force
- 21 min
- Issued by
- NWS Eureka, CA
- Area
- Storm-based polygon
County Humboldt County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 51 km from the middle of the area, began a volume at 20:12 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 |
|---|---|---|---|
| Dec 10, 12:18 PM PST | HAIL 0.25 | 1 S Fieldbrook, CA | FROM SOCIAL MEDIA... USER SENT A PHOTO OF ESTIMATED PEA SIZE HAIL IN FIELDBROOK, CA. |
| Dec 10, 12:23 PM PST | HAIL 0.25 | 3 N Arcata, CA | FROM SOCIAL MEDIA... A USER SENT A PHOTO OF SMALL HAIL COVERING THE CENTRAL AVENUE EXIT FROM HWY 101 TO MCKINELYVILLE. |
| Dec 10, 12:23 PM PST | HAIL 0.5 | 5 Nnw Arcata, CA | FROM SOCIAL MEDIA... ESTIMATED DIME SIZED HAIL FROM MCKINLEYVILLE. |
| Dec 10, 12:23 PM PST | HAIL 0.88 | 5 Nnw Arcata, CA | FROM SOCIAL MEDIA...ESTIMATED NICKLE SIZED HAIL... USER POSTED PHOTO OF HAIL. |
| Dec 10, 12:25 PM PST | HAIL 1 | 5 N Arcata, CA | PEA AND QUARTER SIZED HAIL STONES REPORTED FROM SOCIAL MEDIA... PHOTO INCLUDED COINS TO MEASURE THE STONES. |
| Dec 10, 12:35 PM PST | HAIL 0.75 | 3 N Arcata, CA | FROM SOCIAL MEDIA... A PHOTO REPORT CAME IN AT 1235 PM PST FROM NORTH BANK RD IN MCKINLEYVILLE. 1/2 TO 3/4 INCH HAIL STONES WERE MEASURED...PHOTO INCLUDED MEASURING TAPE. |
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 12:00Z, 8.2 hours before the alert went out and 192 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 868 m above ground
- 0-6 km bulk shear
- 89 kt
- 0-1 km storm-relative helicity
- 198 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
918
WUUS56 KEKA 102009
SVREKA
CAC023-102030-
/O.NEW.KEKA.SV.W.0005.151210T2009Z-151210T2030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EUREKA
1209 PM PST THU DEC 10 2015
THE NATIONAL WEATHER SERVICE IN EUREKA CALIFORNIA HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CENTRAL HUMBOLDT COUNTY IN NORTHWESTERN CALIFORNIA...
* UNTIL 1230 PM PST
* AT 1208 PM PST...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM
WAS LOCATED NEAR MCKINLEYVILLE...OR 9 MILES NORTH OF EUREKA...AND
MOVING NORTHEAST AT 25 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY THE
DAMAGING WINDS.
* LOCATIONS IMPACTED INCLUDE...
ARCATA...MCKINLEYVILLE...WESTHAVEN-MOONSTONE...
ARCATA AIRPORT AND FIELDBROOK.
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 THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.
&&
LAT...LON 4093 12413 4101 12411 4110 12400 4093 12385
4086 12413 4089 12414 4089 12415 4090 12414
4090 12415
TIME...MOT...LOC 2008Z 236DEG 23KT 4092 12410
$$
BC2 follow-up statements
293
WWUS56 KEKA 102020
SVSEKA
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA
1220 PM PST THU DEC 10 2015
CAC023-102030-
/O.CON.KEKA.SV.W.0005.000000T0000Z-151210T2030Z/
HUMBOLDT CA-
1220 PM PST THU DEC 10 2015
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 PM PST
FOR CENTRAL HUMBOLDT COUNTY...
AT 1219 PM PST...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM
WAS LOCATED 3 MILES EAST OF MCKINLEYVILLE...MOVING NORTHEAST AT 25
MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY THE DAMAGING WINDS.
LOCATIONS IMPACTED INCLUDE...
FIELDBROOK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM. DO NOT DRIVE
YOUR VEHICLE THROUGH FLOODED ROADWAYS.
&&
LAT...LON 4094 12408 4099 12407 4106 12398 4094 12388
4090 12404 4091 12407
TIME...MOT...LOC 2019Z 236DEG 23KT 4096 12402
$$
BC726
WWUS56 KEKA 102028
SVSEKA
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA
1228 PM PST THU DEC 10 2015
CAC023-102037-
/O.EXP.KEKA.SV.W.0005.000000T0000Z-151210T2030Z/
HUMBOLDT CA-
1228 PM PST THU DEC 10 2015
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL HUMBOLDT COUNTY WILL
EXPIRE AT 1230 PM PST...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS
AND EXITED THE WARNED AREA. THEREFORE THE WARNING WILL BE ALLOWED TO
EXPIRE. HOWEVER PEA SIZED HAIL...GUSTY WINDS AND BRIEF HEAVY RAIN
ARE STILL POSSIBLE WITH THIS THUNDERSTORM.
LAT...LON 4094 12408 4099 12407 4106 12398 4094 12388
4090 12404 4091 12407
TIME...MOT...LOC 2026Z 236DEG 23KT 4096 12402
$$
BCThe office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 9, 11:23 PM PST | Special Marine Warning | EKA | 82 min | |
| Dec 10, 1:30 AM PST | Areal Flood Advisory | EKA | Humboldt, Mendocino, Trinity | 3 hr |
| Dec 10, 3:03 AM PST | Hazardous Seas Warning | EKA | 54 hr | |
| Dec 10, 4:55 AM PST | Special Weather Statement | EKA | Humboldt | 35 min |
| Dec 10, 4:58 AM PST | Special Weather Statement | EKA | Del Norte | 32 min |
| Dec 10, 5:31 AM PST | Special Weather Statement | EKA | Humboldt | 44 min |
| Dec 10, 7:41 AM PST | Special Weather Statement | EKA | Del Norte | 34 min |
| Dec 10, 7:59 AM PST | Special Weather Statement | EKA | 16 min | |
| Dec 10, 8:17 AM PST | Special Weather Statement | EKA | Del Norte | 13 min |
| Dec 10, 8:41 AM PST | Small Craft Advisory | EKA | 36 hr | |
| Dec 10, 11:30 AM PST | Special Weather Statement | EKA | Del Norte | 30 min |
| Dec 10, 11:38 AM PST | Special Weather Statement | EKA | Mendocino | 22 min |
| Dec 10, 11:56 AM PST | Special Weather Statement | EKA | Humboldt | 19 min |
| Dec 10, 12:00 PM PST | Special Weather Statement | EKA | Del Norte | 15 min |
| Dec 10, 12:03 PM PST | Special Weather Statement | EKA | 42 min | |
| Dec 10, 12:31 PM PST | Special Marine Warning | EKA | 59 min | |
| Dec 10, 12:35 PM PST | Special Weather Statement | EKA | Humboldt | 25 min |
| Dec 10, 12:50 PM PST | Special Weather Statement | EKA | Humboldt | 25 min |
| Dec 10, 2:47 PM PST | Special Weather Statement | EKA | Mendocino | 13 min |
Nearby
Severe Thunderstorm Warnings in California, 2015Every severe thunderstorm warning in 2015
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.