646 
fxca62 tjsj 301043 cca 
afdsju 


Area forecast discussion...corrected 
National Weather Service San Juan PR 
642 am AST Sat Aug 30 2008 


Synopsis...Tropical Storm Hanna was located near 240 miles north 
of San Juan Puerto Rico early this morning...moving west at 10 knots. 
Weak high pressure will briefly build into the area Sunday and 
Monday. A tropical wave is expected to approach the local area 
Tuesday. A series of tropical waves will move across the tropical 
Atlantic for the upcoming week. 




&& 


Discussion...Tropical Storm Hanna continue moving west...north 
of the forecast area. The cyclonic circulation associated with 
this system is creating a south to southwest low level wind flow 
across the local area. At the same time...the outer bands 
associated with Hanna...have been producing scattered showers and 
thunderstorms mainly across the Atlantic coastal waters. Some of 
these showers was affecting the U.S Virgin Islands early this 
morning. Hanna is expected to move west or west northwest during 
the next two days. As this system move away from the local 
area...winds will prevail mainly from the south and southeast...in 
combination with available moisture...will enhance the development 
of showers and thunderstorms mainly across the northern half of 
Puerto Rico. The next week...a series of tropical waves are 
located ni the tropical Atlantic. The most active one..is 
currently in th far eastern Atlantic...south of the Cape Verde 
Islands. This system is showing sign of organization...and further 
development is possible during the next 24-48 hours. 


&& 


Aviation...thin bands of convection are spiraling into Tropical 
Storm Hanna and a few will cross through the Leeward Islands where 
airports tncm and tkpk reside. These bands are producing winds of 15 
to 20 knots with gusts of an additional 10 to 15 knots in isolated 
cases and lower visibilities in heavy rain. One band has already 
passed tist and organized convection will only occur there later in 
the day should another band form. Puerto Rico may be affected 
between 12 and 16z by a band now 25 to 30 miles north of them but 
aviation concerns will be more affected by the general convection 
over the center of the island in the form of showers and 
thunderstorms. These storms will move north as the afternoon 
progresses. After 16z mountain obscurations must be expected and MVFR 
conditions in heavy rain. Tjps should only experience brief MVFR 
conditions...while those on the north coast may be more prolonged. 
Winds will be gusty near thunderstorms. Conditions will improve 
after 22z. 




&& 


Marine...NE to north-northeast swell are starting to arrive to our local 
Atlantic waters. Seas are expected to build from 5 to 6 feet 
today across the near shore Atlantic waters and local passages. 
At this time...41043 buoy...located northeast of Puerto Rico is reporting 
9 feet of significant wave height. The center of Tropical Storm 
Hanna passed ver close to this buoy. Early this morning... the 
buoy was reporting winds near 35kts from the south southwest...and 
a sea level pressure of 1002 mb. Seas will begin to diminish 
tonight for a more typical wave height. Small craft should 
exercise caution across the offshore Atlantic waters. 




&& 


Preliminary point temps/pops... 
sju 92 79 89 78 / 70 20 20 50 
stt 88 80 87 79 / 50 50 50 50 


&& 


Sju watches/warnings/advisories... 
PR...none. 
Vi...none. 
&& 


$$ 


12/71/