Area Forecast Discussion
Issued by NWS Salt Lake City, UT
FXUS65 KSLC 260408
Area Forecast Discussion
National Weather Service Salt Lake City UT
1008 PM MDT THU AUG 25 2016
.SYNOPSIS...Moisture over southern Utah will spread northward
through Friday. Drier air will return for the weekend and early next
.DISCUSSION...An upper trough encompasses the northern Rockies
this evening inducing a cyclonic westerly flow across the forecast
area. A stalled surface boundary associated with this trough
stretches across the forecast area roughly along a Roosevelt-
Nephi-Ibapah line. North of this boundary a stable and relatively
cool airmass resides across northern Utah, while to the south
a moist unstable airmass is in place with dew points running in
the 40s (low 50s in the lowest elevations) and PW values near 1
inch. A mid level circulation noted in water vapor imagery
crossing southern Utah is helping to maintain showers and
thunderstorms after sunset, and given the cyclonic nature of the
mean flow these will likely linger into the overnight hours even
with the aforementioned wave exiting to the east.
One last shortwave currently digging south through the interior
Pacific Northwest will round the base of the mean trough and cross
northern Utah Friday. This will generally re-enforce the
relatively cool and stable airmass in place across the north,
although may help to fire a few showers/thunderstorms across the
northern mountains. Meanwhile scattered convection is once again
expected across the south.
Updated to increase pops into the chance/scattered category
across the southern third of the area. Otherwise going forecast
overnight looks in good shape.
.AVIATION...VFR conditions with south winds will prevail through
the morning hours Friday at KSLC.
.FIRE WEATHER...Moisture that had been pooled over southern Utah
has spread northward into central and northeastern portions of the
district this afternoon. The moist airmass will remain in place
through Saturday morning, with instability being provided by a
storm system slowly rotating through the district. This will allow
for the continued threat of showers and thunderstorms, primarily
during the afternoon and evening hours over central and southern
Utah. High pressure will build behind the exiting system on
Saturday, allowing for drier air to move back in from the north
through early next week.
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