Area Forecast Discussion
Issued by NWS Aberdeen, SD

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FXUS63 KABR 261143 AAA

Area Forecast Discussion...UPDATED
National Weather Service Aberdeen SD
643 AM CDT THU MAY 26 2016

Issued at 641 AM CDT THU MAY 26 2016

12z aviation discussion updated below.


.SHORT TERM...(Today through Saturday Afternoon)
Issued at 351 AM CDT THU MAY 26 2016

Upper level low pressure across the Dakotas and MT/WY will be the
focus for additional shower and thunderstorm development later this
afternoon. CAM solutions suggest activity will begin across the
western/central Dakotas where steeper lapse rates exist closer to
the upper low center. Not expecting any severe weather today though
as instability is lacking with MLCAPE values less than 1000 J/KG.
Activity will try to push eastward towards the James Valley by this

Overnight and through the day Friday, frontal boundary establishes
itself over the area, but there are some discrepancies amongst the
models in just where this sets up. Models vary in position from
eastern SD to western MN. A wave of low pressure eventually rides
northward along this frontal boundary on Friday, bringing a good
chance for rainfall. So, where this boundary actually sets up will
be important in determining where best precip chances are.

Shortwave energy will move northeast over the area Friday night into
Saturday, which will keep the precip chances rolling right into the
start of the weekend. Overall, severe weather does not appear to be
a concern during the short term period as best severe parameters are
more south of the area into the Central Plains.

.LONG TERM...(Saturday Evening through Wednesday)
Issued at 351 AM CDT THU MAY 26 2016

The long term models show a short wave trough leaving the region on
Saturday night bringing an end to the showers/storms. Expect Sunday
to be mostly dry at this time along with Sunday night also most
likely being dry. Then the models show an upper level low pressure
trough in southwest Canada dropping southeast and into our region,
intensifying and closing off from early to mid week. All of the
models show different solutions on the location, strength, and
timing of this upper low pressure area. Nevertheless...either
solution will give us chances of showers/storms from Monday on
through Wednesday. Temperatures will be warmer early on mainly in
the upper 70s to the lower 80s cooling some into the low to mid 70s
for Tuesday and Wednesday.


.AVIATION...(For the 12Z TAFS through 12Z Friday Morning)
Issued at 641 AM CDT THU MAY 26 2016

Vfr conditions are expected for all locations through today and
tonight. An upper level low pressure area spinning over eastern MT
this morning will move east today. This will bring the development
of showers and thunderstorms in central SD this afternoon. These
will move east into the evening hours. Some of these may affect the
taf locations.


.ABR Watches/Warnings/Advisories...


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