Weather Service Report


777 
FXUS65 KTWC 190406
AFDTWC

Area Forecast Discussion
National Weather Service Tucson AZ
906 PM MST Sat Nov 18 2017

.SYNOPSIS...Dry conditions will continue through next week. 
Slightly cooler temperatures will occur for the remainder of the 
weekend and early next week, with freezing temperatures possible 
Sunday and Monday mornings for eastern valley locations. Daytime 
temperatures rebound quickly to near record or record levels by 
Thanksgiving.

&&

.DISCUSSION...IR Satellite imagery shows a few cirrus clouds moving 
into southern Arizona from the west. Expect few to scattered cirrus 
for the remainder of the night with skies gradually clearing by 
tomorrow afternoon. At the surface, a tightening pressure gradient 
will cause gusty east winds from Tucson eastward into Sunday 
morning. Latest model guidance does not show any changes from the 
12Z models, so no updates to the forecast necessary. Please see 
previous discussion for more details.  

&&

.AVIATION...Valid thru 20/06Z.
Few to scattered clouds above 20k ft AGL into Sunday afternoon then 
gradual clearing. Surface winds variable at less than 8 kts until 
19/12Z then becoming easterly at 5-15 kts with gusts to 20-25 kts 
until about 19/19Z from KTUS eastward. After 19/19Z winds will 
gradually diminish becoming easterly at 8-12 kts for the remainder 
of the period. Aviation discussion not updated for TAF amendments.

&&

.FIRE WEATHER...Dry conditions into next weekend. Expect gusty east 
winds at times Sunday and again Wednesday into Thursday. 20-foot 
winds will be terrain driven mainly less than 15 mph at other times.

&&

.PREV DISCUSSION...Skies have cleared across the region early this 
afternoon. We may see the return of some patchy cirrus late tonight 
into Sunday morning along with slightly elevated east winds through 
the Gila River Valley. As long as the wind doesn't mix the boundary 
layer too much, we'll see the first widespread freezing temps 
through the Sulphur Springs Valley early Sunday morning. As such, a 
Freeze Warning remains in effect from 1 AM to 8 AM MST Sunday 
morning. 

High temperatures this weekend through Monday should top out in the 
upper 70s for the Tucson area, which is still 7 degrees above 
average for this time of year. The "cooldown" will be short-lived 
though, as a strong ridge of high pressure begins to move into the 
area on Tuesday. The pattern then stagnates a bit as the ridge axis 
inches slowly eastward. This will translate into record or near 
record highs once again returning to the area for Thanksgiving and 
continuing through the holiday weekend. No rain expected for the 
next 7 days and beyond.

&&

.TWC WATCHES/WARNINGS/ADVISORIES...
Freeze Warning from 1 AM to 8 AM MST Sunday for AZZ507>509.
Freeze Warning from 1 AM to 8 AM MST Monday for AZZ507>509.

&&

$$

AH

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