Area Forecast Discussion
Issued by NWS Flagstaff, AZ

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FXUS65 KFGZ 281118

Area Forecast Discussion
National Weather Service Flagstaff AZ
415 AM MST THU JUL 28 2016

.SYNOPSIS...Expect another hot day today, with limited shower and
thunderstorm activity. Expect a cooling trend with increased chances
for showers or thunderstorms by the start of the weekend, lasting
into next week.


.DISCUSSION...Satellite imagery reveals significant MCS activity
over the Gulf of California this morning. This, combined with a deep
thermal low over the Lower Colorado River, will lead to a surge
within a day or two. Strong high pressure over northwestern Arizona
will weaken during the same time frame as low pressure moves into
the Pacific Northwest. This will weaken the cap over our area and
allow for decent return flow that will begin to transport surge
moisture northward over the weekend.

Today will be the last hot day, with cooling temperatures and
increased monsoon activity for the remainder of the seven day
forecast period.


.AVIATION...For the 12Z Package...Expect mostly VFR conditions with
ISOLD-WDLY SCT -SHRA/-TSRA 18Z-02Z Today. Aviation discussion not
updated for TAF amendments.


.FGZ WATCHES/WARNINGS/ADVISORIES...Excessive Heat Warning until 11
PM MST Today for the Grand Canyon and Page regions below 4000 feet




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