239
FXSA20 KWBC 031937
PMDSA
SOUTH AMERICA FORECAST DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
336 PM EDT WED JUL 03 2024
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
NOTE: DUE TO THE 4TH OF JULY BULLETIN...THE NEXT SET OF BULETTIN
AND FORECAST CHARTS WILL BE PRODUCED ON FRIDAY JULY 5TH.
SOUTH AMERICAN DISCUSSION FOR 03 JUL 2024 AT 19 UTC: THE MAIN
SYSTEM OF INTEREST CONTINUES BEING THE ANTARCTIC AIR INTRUSION IN
SOUTHERN PORTIONS OF THE CONTINENT. THE MAIN SURFACE LOW HAS
ALREADY CROSSED EAST INTO THE ATLANTIC BASIN...AND BY 18 UTC ON
WEDNESDAY IT CENTERED NEAR SOUTHERN SANTA CRUZ IN ARGENTINA. AS
THE LOW INTERACTS WITH A 1032 HPA HIGH LOCATED NEAR 90S 40W...A
TIGHT PRESSURE GRADIENT IS PRESENT IN AREAS WEST OF THE LOW. THIS
WILL CONTINUE TO FAVOR MODERATE SOUTH-SOUTHWESTERLY WINDS ACROSS
AUSTRAL CHILE AND MOST OF PATAGONIA ON WEDNESDAY...ACCOMPANIED BY
COLD TEMPERATURES AND PERIODS OF SNOW SHOWERS. IN TERM OF SNOWFALL
AMOUNTS...EXPECT 05-10CM/DAY AND MAXIMA OF 15-25CM IN THE ANDES
BETWEEN 46S AND 51S. IN AREAS SOUTH AND EAST EXPECT LIGHTER
SNOWFALL ACCUMULATION. TO THE NORTH...THE COLD AIR INTRUSION IS
EXPECTED TO REACH ARAUCANIA/LOS RIOS IN SOUTHERN CHILE. GIVEN THE
PRESENCE OF THE 5340 AND 5280 1000-500 THICKNESS CONTOURS...EXPECT
A CHANCE FOR PERIODS WITH MIXED PRECIPITATION FROM VALDIVIA/OSORNO
INTO AREAS TO THE SOUTH. ON THURSDAY...EXPECT MUCH LIGHTER
ACCUMULATIONS AS THE MAIN SYSTEM MOVES INTO THE SOUTH ATLANTIC.
A SURFACE FRONT IS ORGANIZING IN MID-SECTIONS OF THE CONTINENT. AS
SURFACE PRESSURES BUILD IN CENTRAL AND NORTHEAST
ARGENTINA/URUGUAY...THE FRONT IS FORECAST TO ADVANCE NORTHWARD TO
EXTEND ACROSS SANTA CATARINA-BRASIL...CENTRAL PARAGIAU...SOUTHERN
BOLIVIA ON THURSDAY EVENING. BY FRIDAY EVENING IT IS EXPECTED
ACROSS PARANA-BRASIL...THE PARAGUAY-BRASIL BORDER...INTO CENTRAL
BOLIVIA/SANTA CRUZ DE LA SIERRA. EXPECT LIMITED RAINFALL AMOUNTS
WITH THIS SYSTEM...WITH THE LARGEST ACCUMULATIONS CLUSTERING IN
POST FRONTAL AREAS IN SOUTH BRASIL. BY THURSDAY THROUGH EARLY
FRIDAY EXPECT MAXIMA OF 15MM IN RIO GRANDE DO SUL. ON FRIDAY THIS
INCREASES TO MAXIMA OF 20-35MM IN RIO GRANDE DO SUL/COASTAL
PARANA...DOE TO ENHANCED ISENTROPIC LIFT AND AVAILABLE MOISTURE
AND IMPROVED UPPER JET DYNAMICS.
GALVEZ..(WPC)
PALAVECINO (SMN-ARGENTINA)
LEDESMA (WPC)
SARABIA (DMC-CHILE)
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