[Tropical] Tropical Weather Discussion

[EMWIN Server]

AXNT20 KNHC 061805
TWDAT

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1805 UTC Tue Jul 6 2021

Tropical Weather Discussion for North America, Central America
Gulf of Mexico, Caribbean Sea, northern sections of South
America, and Atlantic Ocean to the African coast from the
Equator to 31N. The following information is based on satellite
imagery, weather observations, radar and meteorological analysis.

Based on 1200 UTC surface analysis and satellite imagery through
1630 UTC.

...SPECIAL FEATURES...

Tropical Storm Elsa is centered near 24.9N 82.8W at 06/1500 UTC
or about 105 nm WNW of Key West, Florida and moving NNW or 340
DEG at 10 kt. The estimated minimum central pressure is 1007 mb.
The maximum sustained wind speed is at 50 knots with gusts to 60
kt. Latest VIS satellite shows dry air intrusion along the western
side of Elsa. Despite this, numerous moderate to strong
convection is seen N and NE of the center over the SW Florida
coast within 65 nm of 25N01W. Scattered moderate to isolated
strong convection is present SE of the center over the Keys and
western Cuba.

Tropical Storm Elsa is expected to gradually turn to the N through
this evening and then NNE on Wednesday. Under this track, Elsa
will move parallel to the W coast of Florida through this evening
before making landfall along the Big Band area on Wednesday
morning. Storm surge of 2 to 4 ft are probable along the Panhandle
and central W Florida coastline, 3 to 5 ft along the Big Band
area and 1 to 3 ft along the SW coast and Keys. Rainfall of 4 to
6 inches with locally higher amounts are anticipated along the W
Florida coast, and 1 to 3 inches for the rest of Florida. Urban
and river flooding, and even flash flooding is a major concern.
Stay informed with your local weather forecast office and listen
to possible instructions from you local emergency management
office.

Please read the latest Offshore Waters Forecast issued by the
National Hurricane Center at website -
https://www.nhc.noaa.gov/marine/offshores.php

The latest Elsa NHC Forecast/Advisory and Public Advisory can be
found at www.hurricanes.gov

...TROPICAL WAVES...

An Atlantic tropical wave is along 25W from 16N southward and
moving W at 10 to 15 kt. Scattered moderate to isolated strong
convection is from 03N to 08N between the African coast and 30W.

Another Atlantic tropical wave is near 41W from 12N southward and
moving W near 20 kt. Scattered moderate convection is from 02N to
10N between 33W and 43W.

A third modest tropical wave over eastern Venezuela and northern
Brazil, and moving W near 15 kt. Aided by upper-level divergent
flow near the northern part of the wave, scattered moderate to
isolate strong convection is flaring up over northeastern
Venezuela and adjacent waters.

...MONSOON TROUGH/ITCZ...

The monsoon trough extends from the Gambia coastline at 13N16W to
04N41W. Numerous moderate to strong convection is occurring near
the coast of Gambia and Guinea-Bissau. An ITCZ runs from 04N43W to
near the French Guiana-Brazil border. Scattered showers and
isolated thunderstorms are evident from 02N to 08N between 44W and
the Guiana-Brazil coastlines.

GULF OF MEXICO...

Tropical Storm Elsa is impacting the E Gulf and western Florida.
See the Special Features section above for details.

A surface ridge lies across the N Gulf while an elongated upper-
level low is near the Texas-Louisiana border at 32N93W.
Interaction between convergent surface SE winds related to the
ridge and divergent winds associated with the low is triggering
scattered showers and thunderstorms from the SW Texas coast across
the NW Gulf to the Panhandle. Moderate to locally fresh winds and
seas of 2 to 4 ft are near these showers and thunderstorms.
Gentle to moderate E to SE winds and seas of 1 to 3 ft prevail
elsewhere of the Gulf.

As for the forecast: Tropical Storm Elsa is near 24.9N 82.8W 1007
mb at 11 AM EDT moving NNW at 10 kt. Maximum sustained winds 50
kt gusts 60 kt. Elsa will move to 26.6N 82.9W this evening, 28.9N
83.0W Wed morning, then inland to 31.3N 82.0W Wed evening. Elsa
will remain inland and weaken to a tropical depression near 33.8N
80.0W Thu morning, then move offshore and strengthen to a tropical
storm near 36.7N 76.4W Thu evening. Tropical Storm Elsa will
reach 39.5N 72.5W Fri morning. Elsa will become extratropical as
it moves near Nova Scotia early Sat. Marine conditions will be
hazardous over much of the eastern Gulf through Wed. Atlantic high
pressure will then build across the area in the wake of Elsa
through the next few days. Swells from Elsa are likely to spread
throughout the basin during the period. Showers and thunderstorms
are expected to continue across the north-central Gulf through
Wed.

CARIBBEAN SEA...

Convergent S to SE winds feeding toward Tropical Storm Elsa near
the Florida Keys are producing scattered showers and
thunderstorms just S of western Cuba. Farther S, convergent trade
winds are creating similar conditions over the SW corner of the
basin. Moderate to fresh trades and seas of 6 to 8 ft prevail over
central Caribbean basin, mainly moderate trades and seas of 3 to
5 ft are found elsewhere.

As for the forecast: Tropical Storm Elsa has moved north of the
area into the eastern Gulf of Mexico this morning. Conditions will
continue to improve near Cuba today as Elsa moves farther away
from the area. Widespread fresh to strong trade winds will begin
to increase in the south-central Caribbean beginning late Wed and
continue through the rest of the week. Fresh to strong winds will
pulse at night in the Gulf of Honduras tonight through the rest
of the week.

ATLANTIC OCEAN...

An upper-level low near 23N64W is triggering scattered showers and
isolated thunderstorms S of Bermuda from 21N to 27N between 60W
and 66W. A surface trough over central Florida, ahead of Tropical
Storm Elsa is producing scattered showers and thunderstorms over
central and SE Florida, and the N Bahamas. moving to the west is
identified to be near 23N64W. A stationary front stretching ENE
from the Georgia-S Carolina border to the NW Atlantic is
generating clouds and scattered showers N of 29N between 65W and the
Georgia-S Carolina coast. Otherwise, a ridge extends WSW from a
1031 mb high pressure center north of the area near 34N43W to N
Florida.

Light to gentle winds and seas of 4 to 6 ft are found N of 26N
between 23W and the SE US coast. Moderate to locally fresh winds
and seas of 6 to 8 ft are seen from 10N to 26N between the
African coast and Lesser Antilles. Light to gentle winds and seas
of 3 to 5 ft are present elsewhere.

As for the forecast W of 65W: Tropical Storm Elsa will move
through the northeast Gulf of Mexico today and Wed, then move
across northern Florida Wed night, then along the Georgia coast
Thu and finally north of the area by Thu night. Fresh southeast
winds will develop off the northern and central Florida coasts Wed
and Wed night as Elsa moves inland the northern Gulf coast. High
pressure will then build westward across the area through Sat
night. By Thu, winds will become gentle to moderate once again
with tranquil conditions expected for the remainder of the period.

$$

Chan
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