Severe Thunderstorm Warning 79, NWS Memphis, TN

Area Forecast Discussion
National Weather Service Memphis TN
248 PM CDT Fri Jun 21 2019

.DISCUSSION...
Current satellite/radar imagery shows two decent bow echos moving
through MO and IL. A 30kt LLJ from the southwest currently sits
over eastern Arkansas and is helping pump in moisture from the
south as dew points have been unbearable all day with values in
the mid-to-upper 70s. The storm complex in MO has taken a further
southward trend - making it possible for our northern counties to
get clipped. If the storms hold together, damaging winds will be a
concern as the storms will continue to move into a favorable
environment with plenty of instability as MLCAPE values over the
far northern portion of the CWA currently sits at 4,500 J/kg and
MUCAPE as high as 6,000 J/kg. One limiting factor is bulk shear,
with values maxing out at 30kts over the northern portions of the
CWA.

Additionally, the heat is also a concern and will continue to be
at least through tomorrow as an upper-level ridge builds over the
region through the weekend. Heat indices have reached over 100
degrees over most of the area today with much of the same expected
tomorrow. A weak shortwave at the 500mb level with associated PVA
will move through the northern portion of the CWA late this
evening; this could help keep the showers and thunderstorms
upstream going as they head towards the CWA, some of which could
be strong. However, with a building ridge at the 700mb level,
confidence on potential thunderstorms this evening is not great.
CAMS and short range models are not handling the current pattern
well, so this will likely have to be a nowcasting event if
something gets going over the area this evening.

Cooler air will move in after Sunday as a cold front moves through
the area. Models are in decent agreement on the timing of when the
front will arrive, however there are large differences in the
amount of precip that will fall. The GFS as expected is a little
faster with the front moving in Sunday night and into Monday
morning. The NAM and ECMWF are in a little better agreement with
the front moving through Monday afternoon and evening. However,
the NAM is much drier.  Behind the front, slightly cooler air is
expected with weak perturbations moving through the area with a
zonal and more progressive pattern through the week. The heat
looks to return late next week with a building ridge.

&&

KRF

&&

.AVIATION...18Z TAFs

MVFR ceilings are slowly improving this morning and should lift to
VFR in the next hour or so. Generally dry weather is expect this
afternoon but there is a potential for an evening/overnight MCS to
move southeast across portions of west TN. Confidence remains low
so no mention will be made in the forecast at this time. Low
clouds are expected to develop again tomorrow morning, mainly
south of I-40. Gusty south to southwest winds will diminish
slightly this evening, increasing again on Saturday.

MJ

&&

.MEG WATCHES/WARNINGS/ADVISORIES...
AR...Heat Advisory until 7 PM CDT this evening for Crittenden-Cross-
     Lee AR-Phillips-St. Francis.

MO...None.
MS...Heat Advisory until 7 PM CDT this evening for Calhoun-Chickasaw-
     Coahoma-DeSoto-Monroe-Panola-Quitman-Tallahatchie-Tate-
     Tunica-Yalobusha.

TN...Heat Advisory until 7 PM CDT this evening for Shelby.

&&

Hazardous Weather Outlook
National Weather Service Memphis TN
230 PM CDT Fri Jun 21 2019

ARZ009-018-026>028-035-036-048-049-058-MOZ113-115-MSZ001>017-
020>024-TNZ001>004-019>022-048>055-088>092-221215-
Alcorn-Benton MS-Benton TN-Calhoun-Carroll-Chester-Chickasaw-Clay-
Coahoma-Craighead-Crittenden-Crockett-Cross-DeSoto-Decatur-
Dunklin-Dyer-Fayette-Gibson-Greene-Hardeman-Hardin-Haywood-
Henderson-Henry-Itawamba-Lafayette-Lake-Lauderdale-Lee AR-Lee MS-
Madison-Marshall-McNairy-Mississippi-Monroe-Obion-Panola-Pemiscot-
Phillips-Poinsett-Pontotoc-Prentiss-Quitman-Shelby-St. Francis-
Tallahatchie-Tate-Tippah-Tipton-Tishomingo-Tunica-Union-Weakley-
Yalobusha-
230 PM CDT Fri Jun 21 2019

This hazardous weather outlook is for portions of East Arkansas...
the Missouri Bootheel...North Mississippi...and West Tennessee.

.DAY ONE...Today and Tonight

Heat advisory in effect until early this evening for portions of
east Arkansas...Southwest Tennessee and north Mississippi as the
heat index values will reach over 105 for a couple hours. Most of
the Mid-South will see heat index values this afternoon between 100
and 105, with the exception of areas that thunderstorms develop.

There is a slight risk of severe thunderstorms north and east of a
line from about Corning, Arkansas, to Bolivar, Tennessee, to
Corinth, Mississippi, for today and tonight. Main threat of storms
will be high winds.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Saturday the hot and humid weather will continue with heat index
values generally between 100 to 105.

Sunday will bring a chance for some strong storms before the
front system pushes into the Mid-South.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated at this time.

TLSJr

Special Weather Statement
National Weather Service Memphis TN
445 PM CDT Fri Jun 21 2019

ARZ009-018-MOZ113-212230-
Greene AR-Clay AR-Dunklin MO-
445 PM CDT Fri Jun 21 2019

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED UNTIL 530 PM CDT
FOR...

Northwestern Greene County in eastern Arkansas...
Clay County in eastern Arkansas...
Northeastern Dunklin County in southeastern Missouri...

At 444 PM CDT...a strong thunderstorm producing winds to 50 mph was
located over Neelyville, or 11 miles northeast of Corning, moving
southeast at 10 mph.

Outflow winds will arrive well in advance of thunderstorms.

People in northwestern Greene...Clay and northeastern Dunklin
Counties should monitor this storm closely.

LAT...LON 3663 8996 3633 8996 3617 9081 3629 9081
      3630 9079 3628 9075 3641 9075 3643 9078
      3650 9078 3650 9022 3654 9021 3655 9019
      3659 9019 3663 9015
TIME...MOT...LOC 2144Z 308DEG 12KT 3656 9049