Area Forecast Discussion
Issued by NWS Miami, FL

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FXUS62 KMFL 242024
AFDMFL

Area Forecast Discussion
National Weather Service Miami FL
424 PM EDT SUN JUL 24 2016

.DISCUSSION...
Short term (Tonight-Tue)...an upper level low moving over Florida
is keeping cooler temperatures around 500 mb, between -7 to -8
degrees celsius, while abundant low level moisture lingers across
South Florida tonight. This will keep enough instability and
moisture in place for at least scattered showers and thunderstorms
to continue through this evening.

At 400 pm edt radar data was showing the most active thunderstorms
moving over the Gulf coast areas, and a couple of cells developing
northwest Miami-Dade county. Several outflow boundaries from these
cells are moving across the eastern half of South Florida, which
may trigger additional convection through the rest of the
afternoon and early evening hours.

Most of South Florida remains under a marginal risk for severe
storms through this evening. Most storms will be capable of
producing strong gusty winds in the 40 to 55 mph range, small hail
and localized flooding, but can not rule out the possibility of
experiencing an isolated severe storm or two before the evening is
over. Overall atmospheric setup tonight may be also supportive of
waterspout activity over the nearshore waters.

Model guidance shows the aforementioned upper low migrating
further west and away from the area by Mon, allowing for warmer
temps and drier air to start filtering aloft. However, there
should be enough low level moisture in place to combine with
daytime heating and sea breeze activity to bring another round of
scattered to numerous thunderstorms in the afternoon hours. Also,
winds will begin to increase and veer to a more southeasterly flow,
which will again keep best chances of showers and thunderstorms
over interior and Gulf coast areas. Coverage will be mainly
scattered on Tue as drier air and warmer temps establish aloft,
while some models insist in bringing some Saharan dust intrusion
into the regional air mass as early as Tue afternoon. This may
further decrease chances of showers and thunderstorms,

Afternoon highs remain in the upper 80s to lower 90s over most
coastal metro areas, and climbing into the mid 90s over interior
areas. Heat index readings could reach the lower 100s again by Tue
afternoon, especially if the Saharan dust intrusion materializes.

Long Term (Wed-Sat)...with models showing mid level ridging re-
establishing across the region, 500 mb temps returning to normal
values, and prevailing light to moderate southeasterly flow at the
sfc, expect mainly scattered coverage of showers each afternoon
with a more stable air mass in place. A caveat to this forecast
scenario could be the arrival of a tropical wave feature into the
Caribbean by mid week, but there is still time to adjust the long
term forecast as future guidance becomes available.

Afternoon max temps will rise into the lower to mid 90s, except
along the immediate Atlantic coast where highs will likely remain
in the upper 80s.

&&

.MARINE...
Generally light east/southeasterly flow will prevail across the
South Florida coastal waters, around 10 knots or less tonight and
Mon. Only exceptions will be around thunderstorms, which will
generate brief periods of strong gusty winds, rough seas and
frequent to excessive cloud to water lightning. Seas will remain
around 3 feet or less with little to no swell. The
east/southeasterly flow will begin to increase during the first
half of the work week, with minor increases in seas possible.

&&

.AVIATION...
An upper level low continues to bring lots of instability to South
Florida this afternoon. While there is currently a lull in
activity along the east coast, the chances of activity increasing
again at any given time this afternoon are high enough that the
SHRA VCTS has been left in the forecast for the rest of the
afternoon, and possibly will be needed into the evening hours.
Otherwise, VFR conditions will prevail outside of heavy showers or
storms, which could bring temporary IFR conditions through the
afternoon hours.

&&

.PRELIMINARY POINT TEMPS/POPS...
West Palm Beach  77  91  80  92 /  40  50  20  10
Fort Lauderdale  77  89  80  90 /  30  50  10  10
Miami            77  91  80  91 /  30  50  10  10
Naples           74  90  76  92 /  30  50  20  30

&&

.MFL Watches/Warnings/Advisories...
FL...None.
AM...None.
GM...None.
&&

$$

DISCUSSION/MARINE...17/AR
AVIATION...13/SI



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