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fxus66 kmfr 222159 

Area forecast discussion
National Weather Service Medford or
259 PM PDT Thu Jun 22 2017

Discussion...the main two issues continues to be the heat and
winds offshore. The Chetco effect is in full swing with the
high so far in Brookings reaching 95. For inland areas, the heat
Cranks up Friday and really gets going on Saturday. The thermal
trough continues to build Friday that will raise temperatures for
the western valleys and Siskiyou County. On Saturday, the thermal
trough moves inland to bring the hottest day of forecast period.
High temperatures for the weekend have been raised a few degrees.
Heat advisories and excessive heat warnings have been issued for
Saturday and lingering into Sunday. The morning low temperatures
for the weekend will be in the mid to upper 60s which limits the
overnight relief from the heat. All areas east of the Cascades
will be quite warm but not to advisory levels.

Moisture from a closed upper low off of California is still
expected for later Sunday and into the first of the week. This
will bring a slight chance of thunderstorms to many areas. The
possibility of lightning following the heat wave may increase
fire risk across the area.


Aviation...22/18z taf cycle...strong northerly winds will
impact the coastline today with lighter but still gusty winds into
the Umpqua basin and Illinois Valley. North to northeast winds
should diminish this evening in most places but will remain gusty
over the coastal higher terrain. Mostly VFR across the area for the
next 24 hours. Sk


Marine...updated 215 PM Thursday, 22 June 2017...a strong thermal
trough along the coast continues to produce strong gales and very
steep seas through tonight. The worst conditions will continue to be
over the waters south of Cape Blanco and beyond 5 nm from shore,
however, hazardous conditions will occur over the northern waters as
well. The thermal trough begins to shift inland on Saturday allowing
pressure gradients to weaken, and the strongest winds and heaviest
seas move further offshore as a result. North winds diminish
considerably on Saturday, but fresh north swell will keep seas
elevated. Then a coastally trapped wind reversal brings lighter
south winds, diminishing seas, and marine stratus/fog from south to
north Saturday afternoon through Sunday. -Wright


Mfr watches/warnings/advisories... flag warning from midnight tonight to 8 am PDT Friday for
Heat advisory until 9 PM PDT this evening for orz022.
Heat advisory from 11 am Saturday to 8 PM PDT Sunday for
Excessive heat warning from 11 am Saturday to 8 PM PDT Sunday
for orz023>028.

California...heat advisory from 11 am Saturday to 8 PM PDT Sunday for
Excessive heat warning from 11 am Saturday to 8 PM PDT Sunday
for caz080-081.

Pacific coastal waters...Small Craft Advisory until 11 PM PDT Friday for

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