Weather Service Report


997 
FXUS65 KFGZ 281629
AFDFGZ

Area Forecast Discussion
National Weather Service Flagstaff AZ
930 AM MST Tue Mar 28 2017

.SYNOPSIS...A low pressure center will shift east into New Mexico
this afternoon with decreasing shower and thunderstorm activity over 
northern Arizona. Gusty northerly winds will develop this afternoon 
and continue into early Wednesday. Another system will move into 
northern Arizona from the northwest late Thursday through 
Saturday bringing strong southwesterly winds and showers.

&&
.DISCUSSION...The low is centered near the Four Corners this morning 
with warp around moisture moving north to south over northern 
Arizona. Most of the shower activity has now moved east of the I-
17/Highway 89 corridor as the low shifts eastward. Current grids 
have this trend of showers decreasing from west to east covered 
well. 

&&

.PREV DISCUSSION /412 AM MST/...Lingering shower activity will 
diminish through the day today as a low pressure system slides east 
of the area. There remains the potential for a few thunderstorms 
this morning and afternoon east of Highway 89 and I-17. Behind this 
system, gusty northerly winds will develop with areas south of the 
higher terrain favored for the strongest winds tonight. Gusty winds 
will become more widespread on Wednesday morning as the inversion 
breaks. Winds are then expected to decrease during the afternoon and 
evening as weak ridging moves in. Wednesday and Thursday morning 
will be dry before the next storm system moves into the region. 

There still remains uncertainty as to how far south this system 
will track and how quickly it will exit to the east. Therefore, 
confidence in the amount of precipitation that will fall is low. 
However, there is increasing confidence in a period of strong 
southwesterly winds ahead of the system later Thursday into 
Friday. At this time, it appears wind advisories will likely be 
needed and some favored southwesterly downslope locations could 
near wind warning criteria. This will continue to be fine tuned as
we get closer to the event.

The active pattern looks to continue into early next week with
another storm system dropping southeast and potentially impacting
northern Arizona Monday into Tuesday.

&&

.AVIATION...For the 18Z Package...Scattered showers and 
isolated thunderstorms will continue through late afternoon or early 
evening east of a KPAN-KINW-0V7 line. MVFR ceilings/visibilities 
will be possible under the stronger storms. Elsewhere, an extensive 
cumulus field will develop along and north of the Mogollon Rim, with 
cloud bases at or above 11 kft msl. Gusty northeast to northwest 
winds will increase through the afternoon, with wind speeds between 
10-20 knots and gusts between 20-30 knots. While winds will decrease 
at most places after 01Z Wednesday, strong northerly winds will 
continue overnight at locations to the south of high terrain. 
Aviation discussion not updated for TAF amendments.

&&

.FGZ WATCHES/WARNINGS/ADVISORIES...NONE.

&&

$$

PUBLIC...MAS/TPS 
AVIATION...JJ


For Northern Arizona weather information visit
weather.gov/flagstaff

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Western Regional Climate Center, wrcc@dri.edu