Severe Thunderstorm Warning 79, NWS Amarillo, TX

Area Forecast Discussion
National Weather Service Amarillo TX
1237 PM CDT Fri Jun 19 2020

.AVIATION...
VFR conditions should prevail for most of the 18Z TAF period. For
all TAF sites, VCTS conditions are expected to start around 20-21Z
and continue through around 07-09Z Saturday before thunderstorms
exit the areas around the TAF sites. If thunderstorms move over
TAF sites, erratic winds are expected. Overall winds should
predominately be east and southeasterly at 10-15 kts to start the
TAF period. Winds will then become variable at 5-10 kts past 09Z
Saturday to the end of the TAF period.

Meccariello

&&

PREV DISCUSSION... /Issued 308 AM CDT Fri Jun 19 2020/

SHORT TERM...Today through Saturday night

A cold front has moved into the eastern Oklahoma and northern
Texas Panhandles and will slowly move to the southeast as
convection develops along and near the frontal boundary or may
become quasi-stationary today over the northeast Texas Panhandle
to the western and southwestern Texas Panhandle. Cloud cover and
ongoing convection or additional convection developing this
afternoon along with the cold air advection behind the front will
hold highs today mainly in the 70s behind the cold front to lower
to mid 80s ahead of the cold front. Southwesterly flow aloft today
will advect Pacific moisture into the mid and upper levels while
low level Gulf moisture continues to advect into the Panhandles
from the Rio Grande River and West Texas into the forecast area.
Besides the severe threat today and this evening, very heavy
rainfall which may result in flooding or flash flooding concerns
will also be a threat from the convection.

Upper flow will transition to zonal tonight and Saturday as a
shortwave trough approaches from the west. Lingering convection
tonight into Saturday will move off to the east and south by late
Saturday and Saturday night as subsidence prevails behind the
exiting upper trough. The cold front will move east and south and
should exit the Panhandles by late this evening or overnight
tonight. Surface high will build in from the northwest Saturday
with highs mainly in the 80s Saturday.

Schneider

LONG TERM...Sunday through Friday Night...

By Sunday, a mid to upper- level low will be around southern
Manitoba, Canada with quasi- zonal flow over the FA. By 09Z Monday
a shortwave trough axis will deepen through western SD,
southeastern NE into CO. At the same time a ridge will start to
build over CA, OR, and WA. This pattern will help to set up the FA
for some NW flow thunderstorms.

Sunday is looking to be hot with light winds from the south.
Dewpoints are going to drop in the western half of the FA area
creating some very low RH values. The far western counties in the
combined Panhandles will see RH values drop below 15 percent
during the middle of the afternoon. Going into the evening 60
degree dewpoints will push west again with RH values recovering to
40 percent in the west and 80 percent in the east. Depending on
what model you look at, there could be a well defined dryline
Sunday afternoon across the eastern third of the FA near the
Oklahoma state line. The NAM is one model that suggests a dry
line that will create enough convergence for storm initiation out
ahead of the dryline. The NAM also suggest that the dryline will
be far enough east that storms will be in Oklahoma not the
Panhandles. Trends will have to be monitored as the potential for
severe storms could be present Sunday night.

As the mid to upper level trough digs into the Norther Plains and
Upper Mississippi River Valley on Monday, so will an associated
surface cold front push into the FA from the northeast. Upper
level flow becomes northwesterly by Monday afternoon, with some
perturbations aloft possibly sparking some thunderstorms Monday
evening and each evening there after. Each evening there is a wide
range of PoPs ranging from 20 to 40. The NBM has the best wide
range of PoPs across the FA on Tuesday evening and again Wednesday
afternoon with PoPs trending ever so slightly downward towards
the end of the forecast period. The main concern for storms will
be gusty winds with an inverted V sounding especially in the west
up again New Mexico.

Temperatures look to be slightly cooler on Tuesday and Wednesday
with winds at the surface holding a more easterly component.
Easterly winds will create a little bit of an upsloping cooling
affect that will hold temperature back in the 80's for a high.
Thursday, surface winds become southwest and then temperatures
start to warm into the 90's with down sloping winds. This seems to
be the case through Friday as well.

Hoffeditz

&&

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

&&

29/2

Hazardous Weather Outlook
National Weather Service Amarillo TX
357 PM CDT Fri Jun 19 2020

OKZ001>003-TXZ001>020-317-201100-
Cimarron-Texas-Beaver-Dallam-Sherman-Hansford-Ochiltree-Lipscomb-
Hartley-Moore-Hutchinson-Roberts-Hemphill-Oldham-Potter-Carson-
Gray-Wheeler-Deaf Smith-Randall-Armstrong-Donley-Collingsworth-
Palo Duro Canyon-
357 PM CDT Fri Jun 19 2020

This Hazardous Weather Outlook is for the Texas and Oklahoma
Panhandles.

.DAY ONE...Through Tonight.

Thunderstorms will be possible through tonight across the Oklahoma
and Texas Panhandles. Some storms will have the potential to become
strong to severe, with large hail and damaging winds the primary
hazards. A Severe Thunderstorm Watch is in effect until 11 PM this
evening for the south central and southeast Texas Panhandle. In
addition, heavy rainfall may accompany the strongest, slow moving
storms, which may lead to localized flooding or flash flooding.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Thunderstorms will be possible Saturday and Saturday evening over
eastern sections of the Oklahoma and Texas Panhandles. If storms
form, they are expected to remain below severe levels at this
time.

Additional thunderstorms will be possible Sunday evening through
Thursday across at least parts of the Oklahoma and Texas Panhandles.
Some storms will have the potential to become strong to severe,
with large hail and damaging winds the primary hazards.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may become necessary late this afternoon and
evening. Please relay any information about observed severe
weather to the National Weather Service while following all local,
state, and CDC guidelines.

02

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