Area Forecast Discussion
Issued by NWS San Juan, PR

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FXCA62 TJSJ 212014
AFDSJU

Area Forecast Discussion
National Weather Service San Juan PR
Issued by National Weather Service MIAMI FL
414 PM AST Thu Sep 21 2017

.UPDATE...
Removed the Tropical Storm Warning from the offshore Atlantic
Waters northwest of Puerto Rico.

DISCUSSION... Hurricane Maria continues to move northwest away
from Puerto Rico, but the southerly moisture flow on the southeast
side of Maria lingers. The outer bands of Maria extend over 400
miles to the southeast of the center. This southerly moisture flow
will unfortunately remain through the weekend which will increase
rain chances and maintain breezy conditions across Puerto Rico
and the US Virgin Islands.

Any rain that Puerto Rico receives, which is hard to detect with
the TJUA radar down, will aggravate the ongoing record flooding
on many of the rivers. Heavy rainfall and standing water is
continuing in many locations away from rivers which presents its
own difficulties. Mudslides have occurred and will likely continue
with any additional heavy rainfall. Thus, will keep the Flash
Flood Watch up across all of Puerto Rico and the US Virgin
Islands.

Heat Index values will be in the mid to upper 90s today and
tomorrow but will push 100 or more by the weekend. This will make
recovery efforts difficult and overall living unpleasant as
electricity remains out across the island.

Easterly trade winds will not return until the middle of next
week.

AVIATION...
Hurricane Maria continues to move away from the region with wind
speeds and gust beginning to subside as we move through the TAF
period. Lingering moisture particularly on the west side of Puerto
Rico with MVFR conditions in those regions. USVI have begun to see
some drier air and conditions should improve for these regions with
winds gusting 20-25kts. Moisture from Maria will allow vicinity
showers and storms to be possible across the US Virgin Islands. AMD
NOT SKED remains for all terminals, continue to check with
authorities for airport closures.

MARINE...
Hurricane Maria will continue moving away from the local
waters allowing the occasional tropical storm force winds to
subside in the the waters northwest of Puerto Rico. Elsewhere a
Small Craft Advisory is in effect with south winds of 20 to 30
knots slowly lessening late this evening. More moderate south-
southeast flow is expected through the weekend with seas
continuing to subside.

Showers and thunderstorms with heavy rain, locally higher winds
and waves, and reduced visibilities will be possible in the outer
bands of Maria through the weekend.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  81  87  82  86 /  20  30   0  20
STT  83  84  83  83 /  80  80  30  60

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...Flash Flood Watch through Friday afternoon for Central Interior-
     Culebra-Eastern Interior-Mayaguez and Vicinity-North
     Central-Northeast-Northwest-Ponce and Vicinity-San Juan and
     Vicinity-Southeast-Southwest-Vieques-Western Interior.

     Small Craft Advisory until 6 PM AST Friday for Southeast-
     Southwest.

VI...Flash Flood Watch through Friday afternoon for St Croix-
     St.Thomas...St. John...and Adjacent Islands.

     Small Craft Advisory until 6 PM AST Friday for St.Thomas...St.
     John...and Adjacent Islands.

AM...Flash Flood Watch through Friday afternoon for Coastal Waters OF
     Southwestern Puerto Rico out 10 NM-Coastal Waters of
     Northern USVI and Culebra out 10 NM-Coastal Waters of
     Southern Puerto Rico out 10 NM-Coastal Waters of Southern
     USVI Vieques and Eastern Puerto Rico out 10 NM.

     Small Craft Advisory until 6 PM AST Friday for Anegada Passage
     Southward to 17N-Atlantic Waters of Puerto Rico and USVI
     from 10 NM to 19.5N-Caribbean Waters of Puerto Rico from 10
     NM to 17N-Coastal Waters OF Northwestern Puerto Rico out 10
     NM-Coastal Waters OF Southwestern Puerto Rico out 10 NM-
     Coastal Waters of Northern Puerto Rico out 10 NM-Coastal
     Waters of Northern USVI and Culebra out 10 NM-Coastal
     Waters of Southern Puerto Rico out 10 NM-Coastal Waters of
     Southern USVI Vieques and Eastern Puerto Rico out 10 NM-
     Mona Passage Southward to 17N.

&&

$$

SHORT TERM...MD
MARINE.......MD
AVIATION.....LK


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