Area Forecast Discussion
Issued by NWS Hastings, NE

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FXUS63 KGID 260845

Area Forecast Discussion
National Weather Service Hastings NE
345 AM CDT THU MAY 26 2016

.SHORT TERM...(Today and tonight)
Issued at 345 AM CDT Thu May 26 2016

Quiet conditions are in place across the CWA early this morning, at
least for now, with mostly clear/partly cloudy skies. Looking at
upper air and satellite data, been little change with the
southwesterly flow across the Plains, with the primary features
being areas of low pressure spinning over eastern Montana and over
the Desert SW. At the surface, the latest round of convection that
pushed through mainly south central Nebraska during the mid/late
evening hours Wednesday didn`t exactly make for a clear cut surface
pattern across the region. Light/variable winds are in place, with a
more distinct boundary currently just south of the CWA boundary.

This forecast isn`t exactly straightforward, and as a result,
confidence in exactly how things are going to evolve, even starting
early this morning, is on the lower side. While things the past few
hours have been quiet, short term/hi res models have been fairly
persistent showing some kind of additional development occurring in
the next few hours, but have gone back and forth some with
intensity/overall coverage. Looking to be a result of a weak mid
level wave/isentropic lift, depending on if thunderstorms do
develop, it could affect where the better boundaries set up and how
things go this afternoon/tonight. At this point, models suggest that
areas south of I-80 have the best chance at additional precip this
morning, and that it would likely exit the area by late morning,
bringing a temporary lull in action.

The "main show" still looks to be this afternoon into tonight, as
larger scale lift increases with the approaching upper level low now
in the Desert SW. Expected to move into CO by this evening, along
with mid/upper level jet energy nosing in from the southwest,
thunderstorm chances will be ramping up by mid/late afternoon. Focus
aided by surface boundaries, one of the biggest questions today is
where exactly those will be. Concerning for our CWA is that even if
the main boundary is south this morning, it is expected to push back
north /but how far?/ with the deepening surface low moving into E/SErn
KS. Lift will continue to increase into the evening/overnight hours,
as a 40-50 knot S/SWrly LLJ gets going.

Models continue to be in good agreement showing the potential for
more than sufficient instability and deep layer shear for
thunderstorms to become severe, as well as lower level shear with
surface boundaries in the vicinity - aided by the increasing LLJ
late this afternoon/evening. While large hail/damaging winds look to
be the primary hazards, tornadoes certainly cannot be ruled out.

Some of the most specific details will become more clear as the
daytime passes today, and with the entire Hastings CWA having the
threat for severe weather, folks need to stay updated to the latest
forecast information.

.LONG TERM...(Friday through Wednesday)
Issued at 345 AM CDT Thu May 26 2016

The main concern in the mid and long term is continued chances for
precipitation including chances for severe storms. The mesoscale
details each day will impact the next, making the overall forecast
difficult...and more or less broad brushed.

The upper low will push into the Central/High Plains with the
surface low moving from east central Colorado south into the
Texas/Oklahoma panhandles. The front will move eastward during the
day/afternoon and the warm moist air in the warm sector will be
plentiful for another chance for strong to severe storms. The best
chances currently look for storms to develop and move east with
the upper disturbance during the late afternoon and evening hours.
CAPE is abundant and shear is adequate for storms. Currently
thinking the convection will move off to the east during the
overnight hours...but a chance for storms could persist overnight.

The region will have the best chance for a lull in activity
Saturday and early Sunday as the upper wave finally moves off to
the northeast and the next wave primed to impact the region is
still off over the southwest. Chances for precip increase during
the afternoon/evening Sunday. Highs will be in the 70s and low

The chances for precipitation will continue off and on throughout
this period. The details are messy to determine.  The upper wave
from the southwest will approach by Tuesday and linger over the
Central Plains awaiting the next upper system from the northwest.
Because there is a continued chance for precipitation...each day
will bring with it another chance for flooding. As the ground gets
saturated, more and more rain will become runoff. Flooding
potential will need to be watched in addition to any severe
chances. Highs throughout this period are expected to be in the


.AVIATION...(For the 06Z KGRI/KEAR TAFS through 06Z Thursday night)
Issued at 1237 AM CDT Thu May 26 2016

Overall confidence in this taf forecast is on the low side. Yet
another outflow boundary from convection moving through the area
makes the wind forecast uncertain. At this point kept things
light/variable through early this morning, with a more easterly
direction building in after sunrise. Will have to monitor for the
development of fog as well early this morning, through models
generally keep the best chances just south of the terminal areas.
Additional chances for thunderstorms will return mainly this
afternoon, so do have VCTS mention going.


.GID Watches/Warnings/Advisories...


LONG TERM...Billings Wright
AVIATION...ADP is the U.S. government's official web portal to all federal, state and local government web resources and services.