Area Forecast Discussion
Issued by NWS Jackson, MS

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FXUS64 KJAN 210843

Area Forecast Discussion
National Weather Service Jackson MS
343 AM CDT Thu Sep 21 2017

Today and Tonight...Warm and humid conditions will continue across
the forecast area today as high pressure at the surface strengthens
a bit from the northeast into the region.  Aloft, the forecast area
will be fixed between high pressure wedging southwest from the Mid-
Mississippi River Valley through the Mid-South region, and increased
troughing from the East Coast, southwest into the Deep South.  This
combination will result in northeast flow aloft across the forecast

Patchy fog will erode across the area after sunrise this morning and
heating ensues.  Highs this afternoon under mostly sunny skies will
warm up to around 90.  With dew points remaining in the low and
middle 70s, afternoon heat indices will hover around the century
mark across much of the area.

Isolated to scattered showers and storms will again be possible
during the afternoon hours, primarily across the Golden Triangle
area and southern portions of the CWA.  Given the before mentioned
northeast flow aloft over the area, movement with much of today`s
convection will likewise have a northeast to southwest movement.
While severe storms aren`t expected today, an isolated storm or two
could become capable of producing wind gusts up around 40 mph,
mainly across southern portions of the CWA where mid-level lapse are
a tad bit steeper than elsewhere.  Like convective trends the past
few days, this activity will quickly dissipate after sunset this

Despite some lingering clouds from afternoon convection, skies will
be mostly clear overnight.  Some slightly drier air will begin to
gradually filter into the region from the east during this time.
With some patchy fog again possible early Friday morning, especially
in locales where rain is observed today and skies clear tonight,
lows will range from the upper 60s to lower 70s. /19/

Friday through Wednesday...Little change will occur to our weather
pattern through the period. Upper level ridging will take hold of
the region through the weekend into early next week. This will
keep our summer-like pattern in place despite the fact that fall
officially arrives on Friday. Highs through the period should
remain in the upper 80s/lower 90s. Overnight lows will also remain
mild for this time of year in the upper 60s and lower 70s. Rain
chances will exist through the weekend, especially for the southern
half of my forecast area. This upper ridge will be strong enough
to block the eastward motion of an upper trough and cold front to
our west. As the upper ridge breaks down by mid-week next week,
this will allow the trough to trek eastward, and allowing the
front to drop through the area. /28/


06Z TAF discussion:
VFR flight categories will prevail at most sites through the
overnight hours. Some patchy fog and/or low stratus developing
towards day break could result in a brief bout of MVFR/IFR
visibilities/ceilings. These will quickly rebound to VFR
categories after sunrise as both gradually erode as heating
ensues. Some isolate to scattered convection will again be
possible this afternoon. This could again result in a brief bout
of degraded flight categories at sites where it`s observed. Winds
today across the area will be around 5 knots, becoming more
easterly during the course of the day. /19/


Jackson       92  70  90  70 /  14   8  32   8
Meridian      93  69  90  69 /  14  10  35   9
Vicksburg     92  70  91  70 /  15   6  27   9
Hattiesburg   91  69  90  69 /  20  14  35  16
Natchez       90  71  90  70 /  23  10  27  16
Greenville    93  70  92  70 /  14   4  12   4
Greenwood     92  70  90  70 /  14   4  13   4





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