Area Forecast Discussion
Issued by NWS Tucson, AZ

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FXUS65 KTWC 211005
AFDTWC

Area Forecast Discussion
National Weather Service Tucson AZ
305 AM MST Thu Sep 21 2017

.SYNOPSIS...A low pressure system will bring strong and gusty
winds each afternoon through the weekend. A few showers or
thunderstorms may proceed the system, but activity should remain
very isolated. Cooler temperatures will arrive Friday, with readings
holding below average through at least the middle of next week.

&&

.DISCUSSION...The main story will be the wind and cooler weather as
the tail end of a low pressure system affects the region. Models
have been persistent in deepening a system over the Intermountain
West today through the weekend. Moisture needed for rain chances
will be very limited, so the noticeable changes will be strong winds
followed by cooler temperatures. The wind was forecast to be the
strongest on Friday with high temperatures dropping 8 to 10 degrees
from this afternoon to Saturday. Models showed a secondary system
developing over the Southwest United States by the middle of next
week. This feature will help maintain high temperatures near or
slightly below normal through much of the week.

&&

.AVIATION...Valid thru 22/12Z.
SKC thru most of pd. The exception will be FEW-SCT clouds abv 8k ft
AGL btwn 21/19z and 22/03z. SFC wind vrbl less than 10 kts this am
increasing this aftn to SWLY 15-20 kts with gusts to 30 kts. Wind
diminishing to less than 10 kts aft 22/03z. Aviation discussion not
updated for TAF amendments.

&&

.FIRE WEATHER...A deepening upper trough over the western United
States will result in gusty southwest winds, especially during the
afternoon and early evening hours through Saturday. The strongest
winds are expected on today and Friday, with a cooling trend Friday
through Sunday. Isolated storms will be possible over the mountains
in the eastern portion of the state before drying out this weekend.

&&

.TWC WATCHES/WARNINGS/ADVISORIES...None.

&&

$$

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