Area Forecast Discussion
Issued by NWS San Juan, PR

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXCA62 TJSJ 030814
AFDSJU

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
414 AM AST SUN MAY 3 2015

.SYNOPSIS...UPPER LEVEL RIDGE WILL CONTINUE TO ERODE THROUGH
MID WEEK AS TROUGH ALOFT AMPLIFIES ACROSS THE WESTERN ATLANTIC
AND INTO THE CARIBBEAN. MID LEVEL RIDGE WILL REMAIN NEARLY
INTACT THROUGH THURSDAY. SURFACE HIGH PRESSURE WILL EXIT THE
MID ATLANTIC COAST MONDAY AND BUILD EASTWARD ACROSS THE WESTERN
ATLANTIC TIGHTENING THE PRESSURE GRADIENT WITH TRADE WINDS
RETURNING AND STRENGTHENING ACROSS THE AREA.

&&

.DISCUSSION...MOSTLY CLEAR SKIES PREVAILED ACROSS THE LOCAL
ISLANDS OVERNIGHT...WITH BRIEF LIGHT SHOWERS OBSERVED OVER THE
LOCAL WATERS. WINDS WERE LIGHT AND VARIABLE WITH COASTAL TEMPS
IN THE UPPER 70S TO LOWER 80S.

ALTHOUGH THE UPPER LEVEL RIDGE WILL CONTINUE TO ERODE OVER THE
NEXT FEW DAYS...THE MID LEVEL RIDGE WILL HOLD ACROSS THE AREA.
THIS PATTERN COMBINED WITH LIMITED LOW LEVEL MOISTURE WILL RESULT
IN FAIR AND STABLE WEATHER CONDITIONS THROUGH AT LEAST MID WEEK.
HOWEVER...LOCALLY INDUCED SHOWERS CANT BE RULED OUT EACH AFTERNOON
OVER THE INTERIOR AND NORTHWEST PORTIONS OF PUERTO RICO.

NAAPS GUIDANCE CONTINUES TO INDICATE A NEW AREA OF SAHARAN DUST
ARRIVING ON TUESDAY...WITH MODELS INDICATING DRYING OCCURRING
ALONG WITH THE STRENGTHENING WINDS. THEN BY THE END OF THE WORK
WEEK AND INTO THE UPCOMING WEEKEND...MOISTURE MAY POOL ACROSS THE
AREA DEPENDING ON THE LOCATION OF A TROUGH DEEPENING TO THE WEST.

&&

.AVIATION...VFR THRU THE NEXT 24 HRS...WITH FEW CLOUDS AND
ISOLD SHRA POSSIBLE AFT 0317 IN THE VCNTY OF TJBQ & TJMZ. SFC
WND CALM TO LIGHT/VRB OVERNIGHT...FOLLOWED BY SE WINDS AT 10-15
MPH WITH OCNL GUST UP TO 20 KT AND SEA BREEZE VARIATIONS AFT
03/12Z.

&&

.MARINE...SURFACE HIGH PRESSURE WILL EXIT THE MID ATLANTIC COAST
MONDAY AND BUILD EASTWARD ACROSS THE WESTERN ATLANTIC TIGHTENING
THE PRESSURE GRADIENT WITH TRADE WINDS RETURNING AND STRENGTHENING
ACROSS THE LOCAL WATERS. SEAS WILL THEN REACH 7 FEET ACROSS THE
OFFSHORE WATERS.

&&

.FIRE WEATHER...PERSISTENT HIGH PRESSURE ALOFT WILL CONTINUE
TO MAINTAIN DRY CONDITIONS AND DESICCATE FUELS. FIRE DANGER
WILL INCREASE TUESDAY AND WEDNESDAY AS WINDS STRENGTHEN IN
RESPONSE TO BUILDING SURFACE HIGH PRESSURE TO THE NORTH.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  91  77  91  78 /  20  20  20  10
STT  88  78  88  78 /  20  30  30  20

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...NONE.
VI...NONE.
AM...NONE.
&&

$$

15/23


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.