










Good morning. Yes!. Rain finnally will arrive starting this afternoon and it looks like it may linger thru the weekend.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
421 AM AST THU MAR 28 2013
.SYNOPSIS...BROAD MID-UPPER TROUGH ACROSS THE WRN ATLC WILL BE
SLOW TO PROGRESS EWD NEXT SVRL DAYS. ASSOCIATED SFC FRONT WILL
REACH THE AREA FRI NIGHT THEN LINGER AROUND INTO EARLY NEXT WEEK.
&&
.DISCUSSION...LOCAL AREA STILL UNDER A PWAT MINIMUM THIS MORNING
BUT LIGHT WINDS...DAYTIME HEATING AND INCREASINGLY UNSTABLE
CONDITIONS SHOULD BE ENOUGH FOR SOME AFTERNOON CONVECTION SIMILAR
TO YDAY. CONVECTION MAY BE DEEP ENOUGH TO PRODUCE TSTMS.
PRECIP CHANCES INCREASE MARKEDLY TONIGHT AS BROAD TROF PROMOTES
QUICK MOISTURE TRANSPORT AND ENHANCES MID LEVEL INSTABILITY. SFC
WINDS ALSO SHIFT TO THE NORTHEAST ALLOWING FOR INCREASED SFC
CONVERGENCE ON THE NORTH SIDE OF THE CORDILLERA. ADDED TSTMS FOR
ATLC COASTAL WATERS WHERE K INDICES ARE HIGH...SHOWALTER INDICES
SLIGHTLY NEGATIVE AND FORCING LOOKS STRONG. AS S/W ENERGY ROTATES
AROUND BROAD TROF AND SFC FRONT BECOMES NEARLY STATIONARY ACROSS
THE AREA EXPECT CLOUDY SKIES AND LIKELIHOOD OF SHOWERS THROUGH
THE WEEKEND. THE ONLY EXCEPTION WOULD BE AROUND ST. CROIX WHERE
FRONT MAY NEVER MAKE IT. GLOBAL MODELS DIFFER ON THE EXACT
DETAILS ON HOW THINGS WILL EVOLVE OVR THE WEEKEND BUT THE GENERAL
TREND SHOULD BE FOR COOLER...CLOUDY AND SHOWERY CONDITIONS THROUGH
THE WEEKEND.
EARLY NEXT WEEK...GLOBAL MODELS SHOW UPPER LEVEL PATTERN
DEAMPLIFYING WITH UPPER LEVEL RIDGE GRADUALLY BUILDING OVER THE
REGION BY MID NEXT WEEK. STARTING MON NIGHT...MODELS SHOW A RAPID
DRYING TREND THROUGH THE REST OF NEXT WEEK.
&&
.AVIATION...CONTD VFR XCPT IN ISOLD SHRA MAINLY TNCM/TKPK. FEW OBSCD
MTNS THIS AFT IN SHRA/TSRA. POSBL BRIEF MVFR INCRG WEST PR THIS AFT
AND N PR TONITE. WIND THRU TONITE BLO FL100 VRB TO NE 10 KT OR LESS.
&&
.MARINE...SEAS BUILDING OVER THE WEEKEND POSSIBLY UP TO 8 FT IN
NORTH SWELLS. SCA MAY BE REQUIRED FOR AMZ710 IN 430 AM CWF ISSUANCE.
&&
.FIRE WEATHER...STILL VERY HIGH FIRE DANGER TODAY AS AREA REMAINS
IN A LOW LEVEL MOISTURE MINIMUM AND MOISTURE RETURN LOOKS TO BE
SLOWER THAN ANTICIPATED YESTERDAY. CONDITIONS WILL ALSO BE
UNSTABLE WHICH WOULD TEND TO ENHANCE ANY FIRES. QUICK MOISTURE
RECOVERY IS EXPECTED TONIGHT WITH SOME RAIN OVER THE WEEKEND.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 84 74 83 74 / 10 20 70 70
STT 84 76 84 76 / 0 0 20 70