Area Forecast Discussion
Issued by NWS North Platte, NE

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FXUS63 KLBF 211128 AAB
AFDLBF

Area Forecast Discussion...UPDATED
National Weather Service North Platte NE
628 AM CDT Mon Aug 21 2017

.UPDATE...
Issued at 446 AM CDT Mon Aug 21 2017

Updated forecast to include dense fog advisory along the eastern
Panhandle and the Platte River Valley.

&&

.SHORT TERM...(Today and tonight)
Issued at 324 AM CDT Mon Aug 21 2017

Eclipse morning and mvfr and ifr cigs covering most of the forecast
area with patchy fog developing dropping visibilities to 3 to 6
miles across western Nebraska. Dew point spreads across the area 1
to 2F with boundary to the south spreads around 5F. Boundary to lift
north through the morning with southerly winds increasing behind the
boundary and east to northeast winds to the north of the boundary.
Nam holding on to the fog through at least 14 to 15z. Stratus just
complicates cloud forecast. Cirrus above the stratus not as dense as
satellite would suggest with stars visible through canopy to the
south of us where no stratus. Highs today in the 80s with highs late
in the day with more sun. Cool front to move through this afternoon
with marginal forecast for thunderstorms along the front as it moves
through. These will continue with the progression of the front
through the early evening. Lows tonight in the 50s and 60s with some
40s northwest panhandle.

.LONG TERM...(Tuesday through Sunday)
Issued at 324 AM CDT Mon Aug 21 2017

Tuesday and Wednesday... An upper ridge amplifies across the Western
U.S. as a closed low brushes the northern Great Lakes, placing
Nebraska in northwest flow. Generally a quiet period is expected,
other than an schc PoP Wed PM as a sfc low and trough emerge from
the higher terrain to the west. Overall moisture appears rather
scant, but lift sub H6 and better moisture around H7 may be enough
for iso T. High pressure sits right over the Central Plains on
Tuesday, keeping winds light and temperatures fairly mild. H85 temps
range from around 14C north central to 20C panhandle. Return flow
sets up on Wednesday, and with sunshine and deep mixing, temps will
make a run for 90 far west and mid/upper 80s elsewhere.

Thursday through Sunday... H5 flow turns more zonal across the
Plains with the ridge flattening, and the surface synoptic pattern
comprises mainly the slow moving trough. Essentially daily TSRA
chances with the trough providing lift in the low levels and the
high pressure over the Midwest pumping moisture into the area. Best
chance of widespread measureable precip comes late Friday with a
shortwave providing extra support. Seasonable temps through this
period with little WAA and H85 temps hanging around 20C. Friday may
be a bit warmer than forecast with slightly stronger southerly flow
ahead of the system.

&&

.AVIATION...(For the 12Z TAFS through 12Z Tuesday morning)
Issued at 628 AM CDT Mon Aug 21 2017

Widespread vlifr,ifr and mvfr cigs will continue over western
Nebraska early this morning and gradually lift through 15z.
Visibilities will generally remain in the mvfr categories. A cool
front will move across western Nebraska with thunderstorms
developing along the front from KVTN to KOGA after 18z and the
thunderstorms moving east through the afternoon and evening.

&&

.LBF WATCHES/WARNINGS/ADVISORIES...
Dense Fog Advisory until 10 AM CDT /9 AM MDT/ this morning for
NEZ022-023-035-036-056>059.

&&

$$

UPDATE...Power
SHORT TERM...Power
LONG TERM...Snively
AVIATION...Power



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