Area Forecast Discussion
Issued by NWS Amarillo, TX

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FXUS64 KAMA 171753
AFDAMA

Area Forecast Discussion
National Weather Service Amarillo TX
1253 PM CDT Thu Aug 17 2017

.AVIATION...
18z TAF Cycle:

VRF conditions expected through the period. However, isolated to
scattered diurnally driven thunderstorms are expected to develop
across the western Panhandles around 20-21z and move easterly at
10-20 knots. Included tempo groups at all terminals to pinpoint
where confidence for TSRA is greatest. Some storms will be strong
to severe with strong wind gusts being the main threat. This first
round of storms should weaken considerably around sunset. A second
round of storms may develop in response to a mid level
disturbance crossing the area between 06z and 12z, with KDHT and
KGUY having the greatest chance of being affected.

Ward

&&

PREV DISCUSSION... /Issued 406 AM CDT Thu Aug 17 2017/

DISCUSSION...
Conditions will be dry for the early part of today, with increased
thunderstorm coverage late this afternoon and evening.
Thunderstorms have the potential to be severe at steep 700-500 mb
lapse rates will overspread the Panhandles amidst strong heating.
CAPE values on the order of 1000-2000 J/kg combined with about
30kts of deep layer shear will support organized convection. Hail
and winds will be the primary threat. Hi-res models suggest that
things may start off as discrete cells then become more of an MCS
where wind will become more of the threat. Additional things to
note for tonight, a shortwave trof embedded in the northwest flow
is expected to move through late in the evening allowing for
additional forcing to keep convective activity through the night.
A low level jet will set up with the lee side trof, increasing the
low level helicity values. This will not rule out the possibility
for a tornado threat. The threat will remain low, but still not
to be discounted.

Northwest flow will continue Friday into Saturday, and
thunderstorm chances will continue across the Panhandles. PWAT
values will be pushing the 1.50" range on Friday and thusly heavy
rain and possible flooding concerns could be possible with storms.
WPC has the Panhandles in a slight risk for excessive rainfall on
Friday. Saturday will be more isolated in nature as storms as high
pressure attempts to build over the area.

As we move into Sunday and the work week, southwest flow with
increased moisture is to be expected. This will bring back a
chance of thunderstorms each day, but with the increased moisture
will also bring the concerns for further heavy rain and flooding
potential.

Weber

&&

.AMA Watches/Warnings/Advisories...
TX...None.
OK...None.

&&

$$

7/9



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