Area Forecast Discussion
Issued by NWS Eureka, CA

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
FXUS66 KEKA 301024

National Weather Service Eureka CA
324 AM PDT TUE AUG 30 2016

.SYNOPSIS...An upper trough will bring unseasonably cool
temperatures across the interior through the work week with better
chances for blue skies each afternoon along the coast.


.DISCUSSION...Early morning water vapor imagery showed an upper wave
approaching northern California. This will bring a possibility for
thunderstorms over the area into the early afternoon. As of this
morning, radar showed some light showers offshore and near the
Mendocino County Coast. HRRR suggests that most of the shower
activity should remain offshore as the trough slides over the state
into the early afternoon. There were was no indication of lightning
associated with the trough yet with relatively warm cloud tops
associated with the system. In addition, convective parameters do
not look great across the region as the trough seemingly weakens
as it approaches the coast. Nevertheless, I maintained a slight
chance for thunderstorms through the early afternoon as the trough
passage could be enough to trigger an isolated thunderstorm over
the area.

500mb heights will continue to fall through the mid and late week as
a broad upper trough ushers colder air into the Pacific Northwest.
Embedded disturbances in the upper flow could bring some light rain
to the area early Wednesday morning and again late Thursday night,
however, this looks very restricted with the best chances along the
coast and near the OR/CA border. This will also cause inland
temperatures to fall a few degrees over the next few days
maintaining unseasonably cool temperatures through the work week.
Temperatures should increase again by a few degrees late in the
weekend through early next week as ridging moves in behind the
exiting trough. There is still uncertainty in how quickly
temperatures will warm up late in the forecast but as of now inland
temperatures look to remain below normal values.

Coastal cloudiness will be possible over the next several days but
with the presence of the upper trough there will be a better chance
for clouds to scatter out more quickly each afternoon. Coastal
temperatures should remain seasonal but may feel muggy at times with
the system today and tomorrow. /KML


.AVIATION...VFR TO MVFR conditions and light winds to calm conditions will
continue at KCEC and KACV today. Lower conditions will primarily be due to
reduced ceilings. MVFR conditions and light winds to calm conditions will
prevail at KCEC and KACV overnight tonight primarily due to stratus reducing
ceilings. VFR conditions and light winds to calm conditions will continue at
KUKI through today.


.MARINE...A weak pressure gradient will continue across the waters through the
middle of this week. Subsequently light winds and low seas will persist across
the waters through Wednesday.  Winds and seas will gradually increase Wednesday
night and Thursday primarily across the outer waters.


.EKA Watches/Warnings/Advisories...


Visit us at

Follow us on Facebook and Twitter at:

For forecast zone information
see the forecast zone map online: is the U.S. government's official web portal to all federal, state and local government web resources and services.