810
FXUS64 KJAN 240818
AFDJAN

Area Forecast Discussion
National Weather Service Jackson MS
318 AM CDT Mon Jun 24 2024

...New DISCUSSION...

.DISCUSSION...
Issued at 316 AM CDT Mon Jun 24 2024

Today and Tonight...High pressure aloft wedged into the region from
the west, has weakened enough over the forecast area to allow a weak
frontal boundary to sink south into the CWA.  This boundary will
primarily be responsible for bringing an increase in cloud cover to
the area today.  However, it`ll also bring with it a chance for
isolated to scattered showers, and isolated thunderstorms across
mainly central and southern portions of the CWA through this
afternoon as it drops further south through the forecast area.

Winds will become northerly around 5 mph in the wake of the
boundary. Unfortunately for us, no change in airmass will exist
across the area.  The boundary will eventually stall across southern
portions of the CWA tonight, where it`ll gradually washout.  Any
convection that`s ongoing during the afternoon will begin to wane
during the late afternoon and early evening hours as daytime heating
is lost.  Mostly clear skies will exist tonight, with lows only
following into the 70s.

Once again, the main concern during the period will be the increased
heat stress across the region this afternoon. Dew points will range
from the upper 60s to middle 70s this afternoon.  This, coupled with
high temperatures ranging from the mid 90s to around 100, will
generally yield afternoon heat index values between 105-110 across
nearly the entire forecast area.  As a result, the "Heat Advisory"
has been expanded to cover the entire forecast area through 8 PM
this evening. /19/

Tuesday...Oppressive heat will continue into Tuesday as mid level
ridging hangs on just enough to limit convective coverage to
mainly isolated diurnal activity for one more day. Northeast/east
MS will fair best in terms of humidity due to the nearby presence
of a weak front that will allow a somewhat drier airmass to tease
the area. Unfortunately, this may help temps to soar to around 100
in those areas. Highest heat indices will be along and west of
I-55, where dewpoints are more likely to remain in the mid 70s
through the day. Accordingly, we have extended the Heat Advisory
to include the daytime Tuesday. Even where dewpoints may be more
marginal from Meridian up to the Golden Triangle area, temps will
be high enough that it will still be very possible to reach
advisory thresholds.

Wednesday and Thursday...With the upper ridge temporarily
retreating, NW flow aloft will bring a shortwave across the area
Wednesday. Given the moist airmass in place ahead of this feature,
precip coverage is expected to be greater. This is also a window
when there would be some potential for an upstream convective
complex to move into the area, but it`s a bit too early to clearly
anticipate these mesoscale details. Lingering shortwave troughing
along the Gulf Coast will provide an opportunity for higher rain
chances again on Thursday, but focused more over the southern half
of the area. Meanwhile, upper ridging will begin to build again
into the northern half of the area. Overall, clouds and rain will
be more likely to limit daytime temperatures Wednesday and
Thursday than on previous days, but in any areas where clouds/rain
are limited, heat stress may continue to be an issue with heat
indices still potentially reaching dangerous thresholds.

Friday through Sunday: The upper ridge will continue to build over
the area, with temperatures trending back upward. However, the
seasonably moist airmass will remain, fostering mainly diurnal
convection each day. Greatest coverage will be focused over the
eastern half of our area, which will be farthest from the middle of
the ridge. Heat stress concerns will continue to be in the picture
outside of brief relief from any rain. /DL/

&&

.AVIATION...
(06Z TAFS)
Issued at 1220 AM CDT Mon Jun 24 2024

VFR flight categories will prevail at area TAF sites over the
next 24 hours. A weak frontal boundary will sink south through the
region overnight into this morning. This will result in some
scattered clouds developing across the area through the forecast
period, with some isolated convection possible as well through the
forecast period, especially this afternoon across southern
portions of the area. Calm to light southerly winds from the
south overnight, will gradually give way to winds becoming more
northerly around 5 knots in the wake of this boundary. /19/

&&

.PRELIMINARY POINT TEMPS/POPS...
Jackson       96  75  97  77 /  20   0  20  10
Meridian      98  73 100  74 /  20   0  20  10
Vicksburg     96  76  97  77 /  20   0  20  10
Hattiesburg   96  76  98  76 /  50  10  40  10
Natchez       94  74  95  75 /  40  10  30  10
Greenville    99  77 100  77 /   0   0  10  20
Greenwood     98  76 100  77 /  10  10  20  20

&&

.JAN WATCHES/WARNINGS/ADVISORIES...
MS...Heat Advisory from noon today to 8 PM CDT this evening for
     MSZ018-019-025>066-072>074.

     Heat Advisory from 10 AM to 8 PM CDT Tuesday for MSZ018-019-
     025>066-072>074.

LA...Heat Advisory from noon today to 8 PM CDT this evening for
     LAZ007>009-015-016-023>026.

     Heat Advisory from 10 AM to 8 PM CDT Tuesday for LAZ007>009-015-
     016-023>026.

AR...Heat Advisory from noon today to 8 PM CDT this evening for
     ARZ074-075.

     Heat Advisory from 10 AM to 8 PM CDT Tuesday for ARZ074-075.

&&

$$

19/DL