Area Forecast Discussion
Issued by NWS Amarillo, TX

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FXUS64 KAMA 160548
AFDAMA

Area Forecast Discussion
National Weather Service Amarillo TX
1248 AM CDT Wed Aug 16 2017

.AVIATION...06Z TAFS...

VFR conditions are expected over the next 24 hours. Right now
chances for thunderstorms look to be minimal, and therefore no
prob30 groups have been added. South to southwest winds 5 to 15
knots will become west and northwest at KAMA and KDHT TAF sites
around 10Z to 14Z Wednesday and then become northwest and north at
all three TAF sites after 13Z to 15Z Wednesday. Have noted some
low cloud potential at KAMA and KGUY as some guidance suggests
enough clearing to maybe get a thicker layer, but for now will
just keep FEW/SCT in the TAFS.

Weber

&&

PREV DISCUSSION... /Issued 415 PM CDT Tue Aug 15 2017/

DISCUSSION...

August is on pace to be the "rainiest" month on record. Through
August 14th, this is the most rainfall ever on record for the
beginning of August with a total of 6.64" through the 14th. The
next closest record was in 1928 when we had 4.98" through the
14th. The record for August is 8.07" set back in 2009. The total
for the month so far from the rainfall earlier this morning is at
7.76".

Biggest change to this forecast package was to decrease chances for
rainfall today and tonight. That being said, we still have chances
but it doesn`t look as good as it did 12-24 hours ago. Decreased
chances overall in the near-term as well. Still have a "rainy"
forecast going forward overall with multiple chances for
thunderstorms. Also noteworthy, Thursday night has been consistently
showing a good signal for rainfall in the evening through morning
hours of Friday the last several days. This seems to be the trend
through August with night precipitation. This could result in
possible flooding within thunderstorms that produce moderate to
heavy rainfall.

Satellite analysis at 20Z shows limited cumulus across the area
compared to yesterday, which is in line with forecast soundings
showing an elevated capping inversion. A surface trough axis was
located west of our forecast area in eastern New Mexico, where
showers/thunderstorms are beginning to develop just ahead of the
axis. With an upper level trough over western parts of the CONUS,
we are under southwesterly flow aloft. Showers and thunderstorms
west of us are generally moving towards the northeast from the
southwest. We are struggling to break the cap, but forecast
soundings have our western zones breaking the cap later this
afternoon/early evening. Western areas should start to see signs
of showers/thunderstorms by the 5pm-7pm timeframe. We have ample
CAPE around again today but 0-6km bulk shear values are still
unimpressive. Widespread severe weather does not look likely, and
chances are strong wind gusts will be the main concern for any
thunderstorms that do develop, albeit low chances. Severe weather
looks less likely than it did yesterday, and even strong storms
may struggle to develop today/tonight.

Wednesday looks to have very small chances for thunderstorms across
mainly our eastern zones. These are small chances at this time
around 20 percent. Our next "decent" chance for rainfall will be
Thursday night when we have 40-50 percent chances across a good
portion of the forecast area. Storms that do develop will have--as
with the trend lately--ample CAPE and weak bulk shear. Widespread
severe weather does not look likely but certainly a few storms
could be strong with winds the main threat. Storms will be slow
movers as well with a very moist atmosphere in place. There will
be good moisture transport into the forecast area with a decent
low level jet in place around 30 knots. Eastern areas could easily
get around half an inch to perhaps even an inch "broad brush"
wise. Localized higher amounts are definitely possible which could
lead to possible flooding or flash flooding as saturated soils
are in place across much of the forecast area.

Outside of these chances, thunderstorms are possible in nearly
every period, but its too early to say with much confidence the
possibility of severe weather or any other impacts. That being
said, signals for above normal rainfall through the end of August
are apparent.

Temperatures still look to be very close to normal for this time of
year through the extended.

Guerrero

&&

.PRELIMINARY POINT TEMPS/POPS...
Amarillo TX                64  87  66  89  65 /  10  10  40  20  30
Beaver OK                  63  92  67  92  66 /  10  10  50  30  20
Boise City OK              60  84  63  87  62 /  10  10  40  20  10
Borger TX                  66  90  69  92  68 /  10  10  50  20  30
Boys Ranch TX              64  89  67  91  65 /  10  10  40  20  30
Canyon TX                  64  87  66  89  65 /  10  10  30  20  30
Clarendon TX               67  89  69  91  67 /  20  10  40  20  30
Dalhart TX                 62  87  64  90  63 /  10  10  40  20  20
Guymon OK                  63  89  65  91  65 /  10  10  40  30  20
Hereford TX                64  88  65  89  65 /  10  10  30  20  30
Lipscomb TX                65  90  68  91  67 /  20  10  50  30  30
Pampa TX                   64  90  67  90  66 /  20  10  50  30  30
Shamrock TX                67  90  70  92  69 /  20  10  40  20  30
Wellington TX              69  91  71  93  70 /  20  10  40  20  30

&&

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

&&

$$

89/24



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