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Hurricane watch issued for Franklin along eastern Yucatan coast

Posted by Chris in Tampa on 8/7/2017, 5:05 am

It continues to get more organized. Recon will do its first mission this afternoon.

It could be around hurricane strength at landfall, with hurricane conditions as early as tonight, though regardless of the wind the rains from Franklin "could produce life-threatening flash floods".




Satellite floater:
http://www.ssd.noaa.gov/PS/TROP/floaters/07L/07L_floater.html
Atlantic: http://www.ssd.noaa.gov/PS/TROP/trop-atl.html

Track:
http://www.nhc.noaa.gov/refresh/graphics_at2+shtml/084451.shtml?cone#contents




"Tropical Storm Franklin Discussion Number   3
NWS National Hurricane Center Miami FL       AL072017
500 AM EDT Mon Aug 07 2017

Deep convection associated with Franklin has been steadily
increasing in both coverage and vertical depth since the previous
advisory.  Wind data from a late-arriving 0231Z ASCAT-A pass suggest
that Franklin might not have had a closed surface circulation at
that time. However, the new GOES-16 nighttime microphysics imagery
clearly shows low clouds moving from west to east on the south side
of the alleged center, which is suggestive of a closed low-level
circulation. The intensity has been nudged upward to 40 kt based on
sustained winds of 39 kt measured at 4-meters elevation from NOAA
buoy 42057 located about 110 nmi east of the center.

The initial motion estimate is 300/12 kt. The latest NHC model
guidance remains in excellent agreement that Franklin will continue
to move west-northwestward along the south side of a deep-layer
ridge during the next 48 hours or so, making landfall along the
east coast of the Yucatan peninsula in 18-24 hours. After the
cyclone crosses over Yucatan and moves into the Bay of Campeche by
Wednesday, a more westward motion is expected thereafter as the
ridge currently situated over northern Mexico and the southwestern
U.S. builds southward. The track model guidance is tightly clustered
around the previous forecast track, so the new forecast track is
just an extension of the previous one and lies down the middle of
the guidance envelope.

Upper-level outflow continues to expand in the western semicircle,
and a pronounced poleward outflow channel has developed in the
northern semicircle, which is being aided by a large upper-level low
located north of Puerto Rico. Although UW-CIMSS wind analyses
indicate that modest westerly mid-level shear is still affecting the
cyclone, that hindrance is forecast to abate in another 6 h or so.
Both the GFS and ECMWF models are forecasting the deep-layer and
mid-level shear to decrease to near zero in the 12-24 h period,
suggesting that Franklin could undergo a period of rapid
intensification right up until landfall occurs. Unfortunately, the
official intensity forecast does not directly reflect that possible
intensification trend due to the 24-h position being inland over
Yucatan with weakening occuring at that time due to land
interaction. Franklin is likely to reach a peak intensity of about
60 kt or so prior to landfall, and for that reason the government of
Mexico has issued a Hurricane Watch. The cyclone will weaken some as
it moves over the Yucatan, but re-strengthening is expected after
Franklin emerges over the very warm waters of the Bay of Campeche in
the 48-72 h period. The NHC intensity forecast remains close to the
higher SHIPS guidance at 24 hours, and is near the IVCN and HCCA
consensus models after that time.

FORECAST POSITIONS AND MAX WINDS

INIT  07/0900Z 17.1N  84.2W   40 KT  45 MPH
12H  07/1800Z 18.0N  85.8W   50 KT  60 MPH
24H  08/0600Z 19.0N  88.0W   55 KT  65 MPH...INLAND
36H  08/1800Z 19.9N  90.2W   40 KT  45 MPH...INLAND
48H  09/0600Z 20.4N  92.3W   45 KT  50 MPH...OVER WATER
72H  10/0600Z 21.0N  96.4W   55 KT  65 MPH
96H  11/0600Z 21.1N 100.5W   25 KT  30 MPH...INLAND
120H  12/0600Z...DISSIPATED

$$
Forecaster Stewart"




"Tropical Storm Franklin Advisory Number   3
NWS National Hurricane Center Miami FL       AL072017
500 AM EDT Mon Aug 07 2017

...FRANKLIN GRADUALLY GETTING BETTER ORGANIZED...
...HURRICANE WATCH ISSUED FOR A PORTION OF THE YUCATAN COAST...


SUMMARY OF 500 AM EDT...0900 UTC...INFORMATION
----------------------------------------------
LOCATION...17.1N 84.2W
ABOUT 285 MI...460 KM ESE OF CHETUMAL MEXICO
ABOUT 265 MI...425 KM E OF BELIZE CITY
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...WNW OR 300 DEGREES AT 13 MPH...20 KM/H
MINIMUM CENTRAL PRESSURE...1005 MB...29.68 INCHES


WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:

The government of Mexico has issued a Hurricane Watch for a portion
of the eastern Yucatan peninsula from Chetumal to Punta Allen.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Hurricane Watch is in effect for...
* The coast of Mexico from Chetumal to Punta Allen

A Tropical Storm Warning is in effect for...
* The coast of Mexico from Chetumal to Campeche

A Tropical Storm Watch is in effect for...
* Belize City northward to the border of Mexico
* The coast of Mexico from Campeche to Sabancuy

A Hurricane Watch means that hurricane conditions are possible
within the watch area, in this case within the next 24 hours.

A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area, in this case within
24 hours.

A Tropical Storm Watch means that tropical storm conditions are
possible within the watch area.

Interests elsewhere around the Bay of Campeche should monitor the
progress of this system.

For storm information specific to your area, please monitor
products issued by your national meteorological service.


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
At 500 AM EDT (0900 UTC), the center of Tropical Storm Franklin was
located near latitude 17.1 North, longitude 84.2 West. Franklin is
moving toward the west-northwest near 13 mph (20 km/h) and this
general motion is expected to continue over the next 48 hours.  On
the forecast track, the center of Franklin will pass well north of
Honduras today, then approach the east coast of the Yucatan
peninsula by late afternoon.  Franklin is then expected to move
across the Yucatan Peninsula tonight and on Tuesday.

Maximum sustained winds are near 45 mph (75 km/h) with higher gusts.
Strengthening is forecast until the center reaches the eastern coast
of the Yucatan peninsula, and Franklin could be near hurricane
strength by the time landfall occurs this evening.

Tropical-storm-force winds extend outward up to 140 miles (220 km)
from the center.

The estimated minimum central pressure is 1005 mb (29.68 inches).


HAZARDS AFFECTING LAND
----------------------
RAINFALL:  Rainfall amounts of 3 to 6 inches, with isolated amounts
of around 12 inches, are possible across the Yucatan Peninsula of
Mexico and Belize through Wednesday.  These rains could produce
life-threatening flash floods.

WIND:  Hurricane conditions are possible in the Hurricane Watch
area by this evening.  Tropical Storm conditions are expected to
begin in portions of the warning area this afternoon.  Tropical
Storm conditions are possible in portions of the watch area in
Belize by late afternoon.  Tropical Storm conditions are possible in
the watch area in Mexico on Tuesday.


NEXT ADVISORY
-------------
Next intermediate advisory at 800 AM EDT.
Next complete advisory at 1100 AM EDT.

$$
Forecaster Stewart"

NHC: http://www.nhc.noaa.gov/

129



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Hurricane watch issued for Franklin along eastern Yucatan coast - Chris in Tampa, 8/7/2017, 5:05 am

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