Alert archive / California / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 3, NWS Eureka, CA

July 22, 2014Humboldt County, Trinity County, California

NWS Eureka, CA issued this severe thunderstorm warning at Jul 22, 2014, 4:58 PM PDT for Humboldt County, Trinity County, California. It was in force for 32 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
Jul 22, 2014, 4:58 PM PDT (23:58 UTC)
Expired
Jul 22, 2014, 5:30 PM PDT
In force
32 min
Issued by
NWS Eureka, CA
Area
Storm-based polygon

Counties Humboldt County, CA, Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 107 km from the middle of the area, began a volume at 00:01 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, 12.0 hours before the alert went out and 142 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 2014-07-22Temperature 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 12:00Z on 2014-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 square meters per square second.193958Sfc1 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
2115 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
213 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

791 
WUUS56 KEKA 222358
SVREKA
CAC023-105-230030-
/O.NEW.KEKA.SV.W.0003.140722T2358Z-140723T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EUREKA CA
458 PM PDT TUE JUL 22 2014

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHEASTERN HUMBOLDT COUNTY IN NORTHWEST CALIFORNIA...
  NORTHWESTERN TRINITY COUNTY IN NORTHWEST CALIFORNIA...

* UNTIL 530 PM PDT

* AT 454 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM.  THIS STORM WAS LOCATED OVER NORTHWESTERN
  TRINITY COUNTY...OR 16 MILES EAST OF WILLOW CREEK...AND MOVING
  NORTH AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL NORTHWESTERN TRINITY COUNTY AT 510 PM PDT

LAT...LON 4095 12323 4096 12347 4134 12349 4134 12347
      4132 12345 4128 12345 4126 12343 4124 12345
      4116 12339 4117 12335 4115 12330 4108 12324
      4108 12322
TIME...MOT...LOC 2358Z 182DEG 22KT 4105 12335

$$
3 follow-up statements
377 
WWUS56 KEKA 230002
SVSEKA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
502 PM PDT TUE JUL 22 2014

CAC023-105-230030-
/O.CON.KEKA.SV.W.0003.000000T0000Z-140723T0030Z/
HUMBOLDT CA-TRINITY CA-
502 PM PDT TUE JUL 22 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM PDT
FOR NORTHWESTERN TRINITY AND EXTREME NORTHEASTERN HUMBOLDT
COUNTIES...

AT 501 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED OVER NORTHWESTERN TRINITY COUNTY...OR 17 MILES EAST OF
HOOPA...MOVING NORTH AT 25 MPH.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 4095 12323 4096 12347 4134 12349 4134 12347
      4132 12345 4128 12345 4126 12343 4124 12345
      4116 12339 4117 12335 4115 12330 4108 12324
      4108 12322
TIME...MOT...LOC 0002Z 182DEG 22KT 4107 12335

$$

MKK
053 
WWUS56 KEKA 230022
SVSEKA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
522 PM PDT TUE JUL 22 2014

CAC023-105-230030-
/O.CON.KEKA.SV.W.0003.000000T0000Z-140723T0030Z/
HUMBOLDT CA-TRINITY CA-
522 PM PDT TUE JUL 22 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM PDT
FOR NORTHWESTERN TRINITY AND EXTREME NORTHEASTERN HUMBOLDT
COUNTIES...

AT 519 PM PDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.
 THIS STORM WAS LOCATED OVER EXTREME SOUTHWESTERN SISKIYOU COUNTY...
OR 13 MILES SOUTHEAST OF ORLEANS...MOVING NORTH AT 25 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 4105 12322 4105 12347 4134 12349 4134 12347
      4132 12345 4128 12345 4126 12343 4124 12345
      4116 12339 4117 12335 4115 12330 4108 12324
      4108 12322
TIME...MOT...LOC 0022Z 182DEG 22KT 4119 12334

$$

MKK
110 
WWUS56 KEKA 230031
SVSEKA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
531 PM PDT TUE JUL 22 2014

CAC023-105-230041-
/O.EXP.KEKA.SV.W.0003.000000T0000Z-140723T0030Z/
HUMBOLDT CA-TRINITY CA-
531 PM PDT TUE JUL 22 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN TRINITY AND
EXTREME NORTHEASTERN HUMBOLDT COUNTIES HAS EXPIRED...

LAT...LON 4105 12322 4105 12347 4134 12349 4134 12347
      4132 12345 4128 12345 4126 12343 4124 12345
      4116 12339 4117 12335 4115 12330 4108 12324
      4108 12322
TIME...MOT...LOC 0022Z 182DEG 22KT 4119 12334

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 22, 3:46 PM PDTSpecial Weather StatementEKATrinity44 min
Jul 22, 3:54 PM PDTRed Flag WarningEKA4 hr
Jul 22, 3:54 PM PDTSevere Thunderstorm WarningEKATrinity36 min
Jul 22, 4:29 PM PDTSpecial Weather StatementEKATrinity31 min
Jul 22, 4:35 PM PDTSevere Thunderstorm WarningEKATrinity25 min
Jul 22, 4:56 PM PDTSpecial Weather StatementEKATrinity34 min

Nearby

Severe Thunderstorm Warnings in California, 2014Every severe thunderstorm warning in 2014

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.