Area Forecast Discussion
Issued by NWS Eureka, CA

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FXUS66 KEKA 251245 AAA

AREA FORECAST DISCUSSION...added fire wx discussion
National Weather Service Eureka CA
514 AM PDT Sun Jun 25 2017

.SYNOPSIS...Hot conditions will gradually cool to near normal by
Monday, and continue through much of the week. Isolated
thunderstorms will be possible across portions of the interior
through Tuesday, mainly during the afternoons and evenings.
Coastal clouds and periods of fog and drizzle will continue over
the next couple of days.


.SHORT TERM (today through Tuesday night)...Low cloudiness
continues to enshroud the coastal waters and adjacent coastal
plains and river valleys this morning. High cloudiness is also
streaming N in a diffluent pattern across the area on the E side
of an approaching upper low. A few showers and even a thunderstorm
or two are noted SE of our area from Tehama to Lake counties.

Nighttime and morning coastal clouds will continue over the next
few days, but improvement should be noted by each afternoon. As
coastal clouds increase, there is the potential for some patchy
drizzle along the Redwood Coast, particularly this morning and
again Monday morning.

Increased moisture and instability combined with an approaching
vorticity maximum from the S will lead to isolated to low end
scattered showers and thunderstorms over the interior today. The
aforementioned upper diffluence will aid in convective development
as well. Dynamic forcing will decrease behind the vorticity max,
with the greatest coverage likely over N Trinity, NE Humboldt, and
E Del Norte counties this afternoon and evening.

The chances for thunderstorms will be waning on Monday as the
upper low moves NE. However, may see some isolated activity over
the Trinity horn. The latest models indicate a vorticity maximum
moving from NW to SE across the area Tuesday afternoon and evening
on the backside of the departing and filling upper low. There may
be enough instability over W Siskiyou County to support at least
isolated thunderstorms, and storm motion should carry them SE into
E Trinity County. Have included this is the latest grids and text
products. See fire weather section below for more information.

Less inland heat is expected early next week, but temperatures
will rise once again by mid-week to about 10 degrees above
normal. /SEC

.LONG TERM (Wednesday through Sunday)...Quiet and dry weather
will persist through the end of the period. Several 500mb waves
will rotate through the area however each wave passage will be dry
and will allow temperatures to remain close to seasonal averages.


.FIRE WEATHER...As mentioned above, the chances of thunderstorms
will be increasing today over the interior with isolated storms on
Monday and Tuesday over the Trinity horn. Precipitable waters levels
are presently running around 1.2 inches across most of the area. As
a result, only a few of the storms today are likely to be dry. As
mentioned in yesterday afternoon`s discussion, fuels in the higher
elevations remain fairly moist. Driest fuels are found across inland
Mendocino County. It appears most of the thunderstorm activity over
the next few days will favor locations N of zones 276 and 277. Will
continue to include headlines in the appropriate fire weather zones.


.AVIATION...An expansive stratus deck continues to inundate much of
the northwest California coast bringing mostly LIFR conditions to
coastal airfields as of early this morning. Visibility will bounce
around through the morning hours and improve by the afternoon.
Clearing skies do not likely for coastal regions, however, low
ceilings will lift with bits of blue skies possible later in the
afternoon. Expect MVFR to IFR to persist along the coast today while
VFR will prevail across the interior. Ceilings and visibility will
deteriorate for coastal airfields once again tonight. /KML


.MARINE...Light winds and low seas will continue to persist for
just a few more days so enjoy it while it lasts. Starting on
Tuesday, surface high pressure will begin to build back towards
the California coastline tightening the pressure gradient across
the ocean. This tighter pressure gradient will increase the
northerly winds across the waters which will in turn begin to
increase wave steepness. Gale force wind gusts will be become
possible starting Wednesday morning. These conditions are expected
to last through at least next weekend. /WCI




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