Area Forecast Discussion
Issued by NWS North Platte, NE

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FXUS63 KLBF 202333

Area Forecast Discussion
National Weather Service North Platte NE
633 PM CDT Tue Jun 20 2017

Issued at 321 PM CDT Tue Jun 20 2017

Large ridge continues over the Desert Southwest with abundant warm
air extending up the west coast and into the central plains. Gulf
of Alaska closed low pushing a cold front onshore in the Pacific
Northwest. Tropical storm Cindy making landfall in the Gulf.Hudson
Bay low and wave rounding it into the Great Lakes then into the
northeast CONUS Cold frontal boundary along the Atlantic Coast.


.SHORT TERM...(This evening through Wednesday)
Issued at 321 PM CDT Tue Jun 20 2017

This afternoon have a cu field over western Kansas with a
thunderstorm southeast of GLD. cu beginning to develop over
southwest Nebraska and more enhanced convection developing south
of McCook. Laps indicating moisture pool over northwest Kansas
into south central Nebraska. Temperatures this afternoon have been
to 97f at klbf. Have retained isolated t over southeast zones
through 7pm. Backdoor cold front from north of oax to vtn. As a
wave moves through fast northwest flow this evening this boundary
will be the focus for thunderstorm development over northern
Nebraska late tonight. Highs tomorrow will rise into the 90s over
most of western Nebraska.

.LONG TERM...(Wednesday night through Tuesday)
Issued at 321 PM CDT Tue Jun 20 2017

Lows tonight will remain in the 60s over most of the forecast
area. Ring of fire to the southwest and upper low breaking down
ridge over western Canada as Gulf of Alaska low moves into south
central Canada tomorrow this will bring a stronger wave along the
South Dakota border Wednesday night with slight chances of
thunderstorms retained. Upper closed low to the north will push a
cold front through western Nebraska through the day on Thursday
with temperatures north around 80 and in the low 90s south. Storms
will focus on boundary stalled out over southwest Nebraska
Thursday afternoon with low level jet developing and crossing the
front thunderstorms some possibly severe are expected to develop
late afternoon and continue into the evening. An upper trough
moves south across the northern plains through the day on Friday
with much cooler temperatures behind it. Highs in the 70s Friday
and the 60s on Saturday with rainshowers from late Friday night
into Saturday afternoon. Gradual warming as the upper trough moves
east through the weekend into the first part of the week with
highs back into the 70s Sunday and approaching 80 on Monday.


.AVIATION...(For the 00Z TAFS through 00Z Wednesday evening)
Issued at 615 PM CDT Tue Jun 20 2017

Regional radar display shows most of the convective activity
occurring in KS, however, radar trends over the last half hour
show returns increasing in far southern NEB across the KS-NEB
border coinciding with cooling cloud tops in satellite imagery.
Thus immediate concerns turn to thunderstorm potential in our far
southeast (specifically Hayes, Lincoln, and Frontier counties)
late this afternoon and evening. While development should spread
a little farther north into NEB (into the local forecast area),
current thinking is at this time the KLBF terminal will not be
impacted. As such, no mention of TS, however, will need to closely
monitor this for possible amendments.

LLWS conditions become a concern tonight associated with a low-
level jet. Upper height of about 1500 ft with winds at the top
around 35-45 kts. Should impact most of terminals in western NEB
then LLWS conditions will diminish in the early morning hours.

Potential for thunderstorms after midnight into tomorrow morning
and again tomorrow afternoon. The former across northern NEB and
the latter primarily east of a line from Imperial to Bassett.
Confidence on the low-end for late tonight thus no mention in the




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