Alert archive / California / Special Weather Statements in 2018

Special Weather Statement, NWS Eureka, CA

May 15, 2018Trinity County, California

NWS Eureka, CA issued this special weather statement at May 15, 2018, 2:28 PM PDT for 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: May 15, 2018, 2:28 PM PDT (21:28 UTC)
Expired: May 15, 2018, 3:00 PM PDT
In force: 32 min
Issued by: NWS Eureka, CA

County Trinity County, CA

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 12:00Z, 9.5 hours before the alert went out and 189 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: 24 J/kg
Mixed-layer CIN: -337 J/kg
Mixed-layer LCL: 1200 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Eureka, CA wrote its last area forecast discussion before this special weather statement went out at May 15, 4:53 AM PDT, 9 hours 35 minutes earlier.

Area forecast discussion, May 15, 4:53 AM PDT, 9 hours 35 minutes before

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  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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Hazardous weather outlook, May 15, 2:26 PM PDT, 2 minutes before

Hazardous Weather Outlook
National Weather Service Eureka CA
226 PM PDT Tue May 15 2018

CAZ102-105>108-110-111-162130-
Del Norte Interior-Northern Humboldt Interior-
Southern Humboldt Interior-Northern Trinity-Southern Trinity-
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
226 PM PDT Tue May 15 2018

This hazardous weather outlook is for northwest California.

.DAY ONE...This afternoon and tonight.

Scattered thunderstorms will continue across interior areas through
the late afternoon and evening. Cloud to ground lightning, gusty
winds, small hail, and brief torrential downpours can be expected
with the strongest storms. Storms will weaken and slowly drift toward
the coast overnight, but may continue to produce occasional lightning
strikes through the night.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Scattered showers and isolated thunderstorms will again be possible
Wednesday, with a few isolated afternoon showers possible Thursday
as well.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.

For further details please refer to NOAA Weather Radio or
weather.gov/eureka.

CAZ104-109-112-113-162130-
Southwestern Humboldt-Mendocino Coast-
Southwestern Mendocino Interior-Southeastern Mendocino Interior-
226 PM PDT Tue May 15 2018

This hazardous weather outlook is for northwest California.

.DAY ONE...This afternoon and tonight.

A few showers may drift towards the Mendocino coast overnight, and a
strike of lightning or two can't be completely ruled out.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.

For further details please refer to NOAA Weather Radio or
weather.gov/eureka.

CAZ101-103-162130-
Coastal Del Norte-Northern Humboldt Coast-
226 PM PDT Tue May 15 2018

This hazardous weather outlook is for northwest California.

.DAY ONE...This afternoon and tonight.

Scattered showers are expected to drift towards the coast late this
evening and overnight, and a few strikes of lightning and brief heavy
downpours will be possible with this activity.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Scattered showers are expected Wednesday, beginning early in the
morning and continuing off and on through the day. A few lightning
strikes and brief heavy downpours will be possible.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.

For further details please refer to NOAA Weather Radio or
weather.gov/eureka.

In the hours before

Local storm report, May 15, 1:49 PM PDT, 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EUREKA CA
149 PM PDT TUE MAY 15 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0146 PM     HAIL             1 NNW ORLEANS           41.31N 123.53W
05/15/2018  E0.25 INCH       HUMBOLDT           CA   TRAINED SPOTTER

            ORLEANS, NERN HUMBOLDT COUNTY... 1/4 NORTH
            OF USFS AT 400 FEET. T-STORMS FOR ABOUT AN
            HOUR WITH LIGHTNING AND SMALL HAIL.

&&

Special weather statement, May 15, 1:51 PM PDT, 37 minutes before

Special Weather Statement
National Weather Service Eureka CA
151 PM PDT TUE MAY 15 2018

CAZ107-108-152130-
Southern Trinity CA-Northern Trinity CA-
151 PM PDT TUE MAY 15 2018

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL TRINITY AND EASTERN
HUMBOLDT COUNTIES UNTIL 230 PM PDT...

At 149 PM PDT, Doppler radar was tracking a cluster of strong
thunderstorms stretching from near Hyampom to near Hayfork. These
storms are nearly stationary.

Half inch hail and winds in excess of 40 mph will be possible with
this storm...along with dangerous cloud to ground lightning.

Locations impacted include...
Hayfork, Big Bar, Burnt Ranch, Peanut, Del Loma and Hyampom.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized minor flooding. Do not drive your vehicle through
flooded roadways.

Cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4041 12307 4057 12355 4072 12355 4085 12349
      4075 12320 4060 12297
TIME...MOT...LOC 2049Z 103DEG 4KT 4067 12342

BC

Special weather statement, May 15, 2:28 PM PDT, 0 minutes before

Special Weather Statement
National Weather Service Eureka CA
228 PM PDT TUE MAY 15 2018

CAZ107-108-152200-
Southern Trinity CA-Northern Trinity CA-
228 PM PDT TUE MAY 15 2018

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL TRINITY AND
NORTHEASTERN HUMBOLDT COUNTIES UNTIL 300 PM PDT...

At 227 PM PDT, Doppler radar was tracking a cluster of strong
thunderstorms near Del Loma and Big Bar, moving northwest at 10 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Hayfork, Big Bar, Burnt Ranch and Del Loma.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4054 12330 4071 12355 4074 12354 4076 12356
      4077 12355 4079 12356 4079 12357 4080 12357
      4080 12356 4081 12356 4094 12327 4067 12306
TIME...MOT...LOC 2127Z 140DEG 9KT 4074 12342

BC

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 1:51 PM PDT	Special Weather Statement	EKA	Trinity	39 min
May 15, 2:59 PM PDT	Special Weather Statement	EKA	Trinity	16 min
May 15, 3:47 PM PDT	Special Weather Statement	EKA	Trinity	58 min
May 15, 4:15 PM PDT	Special Weather Statement	EKA	Trinity	45 min

Nearby

Special Weather Statements in California, 2018 Every special weather statement in 2018

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.