National Weather Service Today's Weather Impact Levels

791
FXCA62 TJSJ 091643 AAA
AFDSJU

Area Forecast Discussion...UPDATED
National Weather Service San Juan PR
1243 PM AST Mon Dec 9 2024

.UPDATE...As winds became east southeast, showers remained off
shore along the northern coast of Puerto Rico and areas along the
southeast coast have had between one quarter and one half inches.
Showers penetrated as far inland as a line from Rio Grande to San
Lorenzo to Guayama. Only light amounts were seen in the U.S.
Virgin Islands. Temperatures were fairly cool during the early
morning hours with lows in the 60s in the mountains and mountain
valleys to the upper 70s on the windward coasts. A few low
temperatures on the minor islands only fell to 81 degrees owing to
the warm waters around them. But despite the cool nighttime
temperatures, highs have reached the upper 80s to around 90
degrees in the lower elevations so far today. The airmass is quite
a bit drier as seen by the precipitable water values falling
below 1.6 inches across the forecast area. Nevertheless a few
showers are forming downstream from the islands and moving
onshore over Puerto Rico in the easterly flow and over the
Cordillera Central. Some of these may have significant rainfall,
but nothing more than urban and small stream flooding is expected
later this afternoon in the wettest places. The outlook for
tonight is for increasing moisture after midnight and tomorrow
will still be breezier than today.

&&


.AVIATION...
(12Z TAFs)

Sct SHRA to spread across the FA from E to W with brief MVFR and
lcl mtn obscurations. SHRA to incr aft 10/06Z. Winds E 8-14 kt
with some hir gusts nr SHRA and alg the coasts. Aft 10/00Z winds
NE 6-12 kt with land breeze influences. Max winds WNW 57-67 kts
btwn FL425-480 and NW 52-63 kts btwn FL255-320.

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...None.
VI...None.
AM...None.

&&

$$

SHORT TERM/AVIATION...WS
UPPER AIR/PUBLIC...GRS

NWS SJU Office Area Forecast Discussion