Area Forecast Discussion
Issued by NWS Tucson, AZ
FXUS65 KTWC 211646
Area Forecast Discussion
National Weather Service Tucson AZ
935 AM MST SAT MAY 21 2016
.SYNOPSIS...Expect breezy to locally windy conditions this weekend
into next week. It will also be cooler this weekend with below
average temperatures persisting through most of next week. No rain
.DISCUSSION...No surprises this morning as the gradient tightens in
response to the low digging into the western Great Basin northwest
of our area. Gusty winds are on track for today and Sunday as
advertised. Please see the previous discussion below for details.
.AVIATION...VALID THRU 22/18Z.
Expect mainly clear skies this morning followed by scattered to
perhaps broken clouds above 20k ft agl this afternoon into Sunday
morning. Surface wind from around 16Z today into this evening will
be south to southwest at 12-20 kts with gusts to near 30 kts.
Surface wind will be variable in direction generally less than 10
kts at other times. Aviation discussion not updated for TAF
.FIRE WEATHER...Dry conditions will prevail through next Friday.
Daytime minimum relative humidity this weekend will range from 10-15
percent in the lower elevations, and 20-25 percent across the
mountains. Daytime minimum relative humidity Monday through Friday
will mostly range from the upper single digits to mid teens.
Expect gusty generally southwest winds during the afternoon and
early evening hours. These wind speeds are anticipated to remain
below critical fire weather thresholds (for the most part) through
However, the combination of gusty southwest winds, low relative
humidity and a very high fire danger rating may briefly produce
critical fire weather conditions this afternoon across portions of
Fire Weather Zone 150 west of Tucson. Thereafter, these conditions
may again be met Wednesday afternoon across portions of Fire Weather
Zones 151 and 152 southeast of Tucson.
.PREV DISCUSSION...Mostly clear skies across Southeast arizona this
morning under southwesterly flow aloft with an upper low centered
across far NW Nevada. As the associated trough pushes to the east
across the Great Basin this weekend, we`ll be on the dry southern
side of the system with southwesterly flow and a somewhat tight
pressure gradient. The pattern of southwesterly flow aloft will more
or less continue through the middle of next week as another trough
moves into the west coast early next week and then slowly pushes
east to move through Arizona by about Thursday. Dry weather through
the forecast period with breezy to windy conditions each afternoon
due to deep mixing and enhanced gradient. Some blowing dust is
possible today along I-10 in Pinal County and near San Simon with a
blowing dust threat continuing near San Simon into the middle of
next week. Otherwise, temperatures will be below normal through the
end of next week with highs staying in the 80`s across the lower
elevations. No 100 degree temperatures in sight.
Meyer et al.
Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson