Alert archive / Florida / Special Marine Warnings in 2021

Special Marine Warning 140, NWS Melbourne, FL

August 4, 2021

NWS Melbourne, FL issued this special marine warning at Aug 4, 2021, 10:51 AM EDT. It was in force for 84 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 4, 2021, 10:51 AM EDT (14:51 UTC)
Expired: Aug 4, 2021, 12:15 PM EDT
In force: 84 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Hail: 0.0 in
Wind: 34.0 mph

What forecasters said that day

The local office's own words before this special marine warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Melbourne, FL wrote its last area forecast discussion before this special marine warning went out at Aug 4, 10:00 AM EDT, 51 minutes earlier.

Area forecast discussion, Aug 4, 10:00 AM EDT, 51 minutes before

Area Forecast Discussion
National Weather Service Melbourne FL
1000 AM EDT Wed Aug 4 2021

.DISCUSSION...

Current...KMLB 88D shows ISOLD-SCT convection with light/moderate
rain moving from WCFL/SWFL into ECFL. 915MHZ USAF Cape wind
profilers show uniformly SW winds around 20 kts just off the deck
thru around 10.0 Kft. Generally MCLoudy skies presently across the
region with the sun having some work ahead to burn this off for
eventual surface heating. A quasi-stationary surface boundary
continues to lie across the Deep South/southeast U.S. to include
north FL. This is keeping the Atlc ridge axis surpressed south of
ECFL.

Today-Tonight...The mid/upper level trough across the Ohio/Tennessee
Valleys will keep the aforementioned surface boundary lingering
across the north Gulf and north FL through the period. Deep moisture
will continue to pool across the region providing fuel for SCT-NMRS
(aftn/evening) convection over the FL peninsula. 500 mb temps will
average between -5.5C-6.5C. Occasional weak mid-level impulses will
traverse the area providing for additional lift to support the
showers/storms. The deep SW/W flow will inhibit ECSB development for
much of the ECFL coast, but will have to monitor for the immediate
St. Lucie/Martin coasts for this feature to possibly be pinned along
the coast. The potential factor to suppressing convection, including
timing, is the persistent mid-high level cloud cover limiting
surface heating. Southwest FL remains very active this morning and
will monitor for convection here pushing into Okeechobee County and
areas across the Treasure Coast for some heavy rainfall potential.

Storm threats will continue to be frequent lightning strikes in a
few storms, gusty winds of 40 to 50 mph in strongest activity, and
torrential downpours leading to nuisance flooding in areas that have
recently seen abundant rainfall and across low-lying/poor drainage
locations. Cannot rule out localized storm totals in a couple spots
of 2-4 inches, especially in slower-moving activity or if/where
heavier showers/storms "train".

Clouds/precip could limit temperatures today and have inherited M-
U80s for highs. We retain the cloud cover again this evening and
overnight and with the deep moisture/proximity to the front, and
passing impulses, cannot rule out a few showers or isolated storm
overnight, though we should gradually see a decrease in ongoing
shower/storm coverage/intensity thru the evening. Overnight lows
generally in the L-M70s with conditions humid.

&&

.AVIATION...Some spotty low-cloudiness this morning. Also watching
ISOLD-SCT convection across WCFL/SWFL trying to push into the
coverage warning area of ECFL. Remains to be seen how mid/high level
cloudiness will affect surface heating/convective timing later this
afternoon. Atmosphere remains very moist with occasional mid-level
impulses traversing the region. Will monitor and update TAF sites
as necessary for convection. MVFR, ISOLD IFR, invof showers/storms.

&&

.MARINE...Today-Tonight...The Atlc high pressure ridge axis
continues southward with a weak frontal boundary draped across north
FL allowing deep moisture to pool across the area. A tighter
pressure gradient is permitting S/SW winds of near 15-20 kts
offshore/north of Sebastian Inlet. It is here where small craft
should exercise caution thru the afternoon and perhaps early
evening. Wind direction may "back" a bit more SSW/S later this
evening and overnight. SCT-NMRS showers with SCT lightning storms
remain in the forecast with some activity moving off of the coast,
especially later in the afternoon/evening. Seas 2-3 ft near shore,
but may approach 4 ft well offshore/north of the Cape. As always,
winds/seas may be higher invof showers/storms.

&&

.MLB WATCHES/WARNINGS/ADVISORIES...
FL...None.
AM...None.
&&

Sedlock/Rodriguez

Hazardous weather outlook, Aug 4, 4:52 AM EDT, 5 hours 59 minutes before

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The office that day

Everything else NWS Melbourne, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 3, 8:26 PM EDT	Special Weather Statement	MLB	Volusia	49 min
Aug 4, 11:24 AM EDT	Special Marine Warning	MLB		66 min
Aug 4, 12:06 PM EDT	Special Marine Warning	MLB		54 min

Nearby

Special Marine Warnings in Florida, 2021 Every special marine warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.