Area Forecast Discussion
Issued by NWS Amarillo, TX

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060
FXUS64 KAMA 260820
AFDAMA

Area Forecast Discussion
National Weather Service Amarillo TX
320 AM CDT Wed Jul 26 2017

.DISCUSSION...
Today will be the last day with hot temperatures for the next
several days. Mostly dry weather conditions today followed by
chances of showers and storms for the next several days into next
week. This includes the risk of heavy rainfall with some areas
receiving persistent rainfall and the potential for flash
flooding.

Starting tonight, a cold front will slowly approach the northern
combined Panhandles bringing showers and storms to the region. A
low amplitude meridional pattern will limit progression southward
of the main lax gradient along the cold front. The latest 26/00Z
hi-res model output and some global model outputs have been
slowing the front`s equatorward progression throughout the
Panhandles which will delay the onset of precipitation for some
areas until later this evening into the overnight hours. The
front will enter the far northern areas late tonight and make its
way south of the TX Panhandle by tomorrow evening. Some storms
this afternoon and evening across the far northwestern Panhandles
may produce heavy rain and localized flooding. Latest 00Z GFS and
other hi-res model output are showing some indication of some low
and mid level convergence along the front and depending where
these storms generate with weak flow aloft to steer these storms,
flash flooding can become a risk. PWAT anomalies from the latest
numerical guidance of some values in the +3 to +4 S.D. range
during the day on Thursday in-conjunction with 850-500 hPa mean
flow of around 10 kts are starting to increase confidence of a
persistent heavy rainfall event. Will continue to update forecast
along as we get closer to tonight into tomorrow. With this very
moist airmass along with daytime heating, a moderate CAPE low
shear environment will be present for some storms in the afternoon
on Thursday and Friday to be strong to possibly severe,
especially in the northern Panhandles with gusty winds being a
threat. However, flash flooding will be the main threat on
Thursday into Friday.

Starting Friday night through the middle of next week, the main
upper level ridge high pressure will slowly begins to drift to the
west, centered over portions of southwestern CONUS by the weekend
and become more positively tilted by early next week. With a
deepening 250 hPa jet setting up over the central and eastern
CONUS by then, perturbations off the main jet flow to the east
will bring more chances of rainfall across the Panhandles under a
good 20-25 kts steering 500 hPa N-NW flow. This will continue to
bring several rounds of diurnal convection across the region
throughout the forecast period. Also with antecedent conditions of
heavy rainfall over the next 24-48 hours possible, this may make
more additional hazards of flooding into next week with already
saturated grounds. For temperatures, after one last day of well
above average values, temperatures will cool down to near average
throughout the rest of the forecast period for late July.

Meccariello

&&

.PRELIMINARY POINT TEMPS/POPS...
Amarillo TX                97  70  87  68  89 /  20  30  40  40  30
Beaver OK                 102  73  84  69  90 /  20  60  40  40  30
Boise City OK              94  66  80  64  86 /  40  80  50  40  30
Borger TX                 100  73  88  70  91 /  20  40  50  40  30
Boys Ranch TX              98  70  88  69  91 /  20  50  50  40  40
Canyon TX                  97  70  88  69  91 /  10  30  40  40  30
Clarendon TX               98  73  91  69  90 /   5  20  40  30  30
Dalhart TX                 97  70  85  67  90 /  40  70  50  40  30
Guymon OK                  98  70  84  67  88 /  30  70  40  40  30
Hereford TX                97  69  89  69  92 /  10  30  40  40  30
Lipscomb TX               101  75  87  70  89 /  20  40  40  40  30
Pampa TX                   98  70  87  67  88 /  20  30  40  40  30
Shamrock TX               100  74  93  71  91 /   5  20  30  30  30
Wellington TX             102  75  97  73  93 /   0  10  30  20  30

&&

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

&&

$$

11/29



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