Scientific Forecaster Discussion
Area forecast discussion
National Weather Service Salt Lake City Utah
943 PM MDT Friday Apr 17 2015
Synopsis...northwesterly flow in the wake of a departing storm
system will prevail through the weekend. High pressure will
temporarily strengthen early next week...before an unsettled
weather pattern develops for the latter portion of the week.
Discussion...the upper low that has affected the forecast area for
the past few days is currently centered over south-central Colorado.
It is forecast to continue to slowly drift east and into the Great
Plains tomorrow afternoon. In the meantime...moisture continues to
wrap around this low...spilling clouds and a few showers into Utah.
Most of the showers are confined to The Spine of Utah and points
east...but are decreasing in coverage this evening. A continued
downward trend in precipitation as well as cloud cover is expected
through the night and into tomorrow morning.
An easterly surface pressure gradient still exists across the
northern Wasatch which will continue to produced enhanced canyon
winds along the Wasatch front. However...winds at 700mb are more
northerly than they were last night so the lack of cold advection
across the terrain would suggest that winds will not be as strong as
they were last night.
A weak shortwave disturbance will cross northern Utah late tomorrow
afternoon and tomorrow evening. This wave will act on the remaining
moisture to generate a few showers across northeast Utah and
southwest Wyoming tomorrow.
Updated the forecast mainly to increase probability of precipitation over the northeastern
zones for the rest of the night...and to make minor tweaks to sky
Aviation...southeast winds will become established at the slc
terminal by 04z or 05z. Otherwise...VFR conditions are expected
through the night.
For more information from National oceanic and atmospheric administration/S National Weather Service visit...
http://weather.Gov/saltlakecity (all lower case)
For frequently asked questions about the area forecast discussion
http://weather.Gov/saltlakecity/general/afd_faqs.Php (all lower case)