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Area forecast discussion 
National Weather Service North Platte NE
107 PM CDT Thursday Jul 2 2015

Short term...(today and tonight)
issued at 334 am CDT Thursday Jul 2 2015

Strong middle level wave continues to move to the east southeast across
the northern plains early this morning. Models in fair agreement
with the sensible weather. Scattered thunderstorms continue from the
northern Nebraska Panhandle into the central sandhills...along the
forward edge of the wave. System has slowed some in the last hour.
Lot of lightning associated with the system but area is congealing
into rain event. Some 30 to 40 knots gusts still possible with stronger
winds aloft. Low level jet absent this morning. This area will continue to
move across western Nebraska today and cloud cover and cooler
temperatures moving into the area today with highs in the 80s.
Scattered precipitation into Thursday night and moving out
of the forecast area after 06z. Lows around 60.

Long term...(friday through wednesday)
issued at 334 am CDT Thursday Jul 2 2015

Long term period begins Friday with weak middle-level height rises over
the Central Plains in the wake of a departing shortwave trough. Surface
high pressure slides southeast into western Nebraska...and
subsidence aloft will make for a dry and mostly sunny day. GFS and
Euro...and their ensembles...remain in solid agreement on the
evolution of the upper level synoptic pattern this weekend. A
northern stream trough pushes east into central Canada as a ridge
amplifies up Canadian coast and into Alaska. Downstream adjustments
result in an increase in low level southerly flow Saturday which
will aid in the poleward flux of deeper moisture. A few storms will
be possible Saturday evening and night as isolated storms develop
along a Lee side surface trough near the Wyoming/neb/SD border and track
southeast into the western sandhills. Proximity soundings show quite
a bit of veering with height which may be supportive of a few severe
storms...however timing issues remain at this point as thunderstorms
will likely dissipate after dark. Storm chances increase Sunday as
the upper level low drops into Manitoba...which will push a cold
front and Canadian airmass southeast into the Central Plains. Highs
Sunday will be warmest in southwest Nebraska where 850mb temperatures
increase to 30c+ ahead of the front. Current guidance calls for low
90s but would not be surprised if this is a little underdone. Storms
likely develop along the front as it moves through Sunday
evening/night. A few strong to severe storms will be
possible...especially if a faster solution is realized and the front
moves through during the late afternoon/evening hours.

Models are now advertising a more progressive pattern early next contrast to the previous solutions which established
quasi-zonal flow over the northern Continental U.S. And stalled the cold front
just south of the County Warning Area. Either way...below normal highs in the 70s
are still in the forecast for Monday but have trended back on probability of precipitation
as surface flow in now drier and lacks the upslope component. Probability of precipitation
continue into the middle of the week as southerly flow becomes
reestablished on the High Plains and shortwave troughs rotate around
the large upper level low moving through Hudson Bay.


Aviation...(for the 18z tafs through 18z Friday afternoon)
issued at 105 PM CDT Thursday Jul 2 2015

Weak boundary sagging south across the area this afternoon. This
boundary has a few storms along it already...and expect the
coverage to increase through the evening hours. Boundary is south
of kvtn so no impact expected there. However the boundary will
push across the klbf area although coverage isolated to scattered so
included a thunderstorms in the vicinity in the taf. Will monitor for an amend if probability of
impact at the klbf terminal increases.

Otherwise generally VFR conditions with some morning fog
possible. If fog develops MVFR to LIFR conditions can be expected.


Lbf watches/warnings/advisories...



Short term...power
long term...Martin

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