565
FXUS62 KJAX 201821
AFDJAX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
121 PM EST FRI DEC 20 2024
..NEW NEAR TERM, SHORT TERM, LONG TERM, MARINE
NEAR TERM
ISSUED AT 108 PM EST FRI DEC 20 2024
FOR THE LATEST NE FL AND SE GA DAILY KEY MESSAGES PLEASE VISIT:
HTTPS://WWW.WEATHER.GOV/MEDIA/JAX/BRIEFINGS/NWS-JAX-BRIEFING.PDF
STRONG HIGH PRESSURE WILL BUILD FROM THE NORTHWEST THROUGH TONIGHT.
THIS PATTERN WILL RESULT IN CLEAR SKIES. COLD ADVECTION WILL LOWER
TEMPERATURES INTO THE 30S INLAND. PATCHY FROST WILL BE POSSIBLE WELL
INLAND DUE TO THE TEMPERATURES FALLING TO NEAR FREEZING, BUT THE
COVERAGE WILL BE LIMITED DUE TO WINDS STIRRING IN THE LOWER
LEVELS.
SHORT TERM
(SATURDAY THROUGH SUNDAY NIGHT)
ISSUED AT 108 PM EST FRI DEC 20 2024
COLD, DRY AIRMASS SETTLES OVER THE REGION THIS WEEKEND AS HIGH
PRESSURE BUILDS OVER THE GREAT LAKES REGION. HIGHS ON SATURDAY
WILL STRUGGLE TO WARM AND ONLY REACH INTO THE 50S, OR ABOUT 10
DEGREES BELOW NORMAL. SATURDAY NIGHT WILL BE THE COLDEST WITH CALM
WINDS AND RADIATIONAL COOLING PROMOTING CRASHING TEMPERATURES AND
WIDESPREAD INLAND FROST DEVELOPMENT. OVERNIGHT LOWS WILL DROP TO
THE LOW/MID 30S INLAND TO THE UPPER 30S/LOW 40S ALONG THE COAST. A
FREEZE WATCH IS IN EFFECT FOR INLAND SE GA AND SUWANNEE VALLEY
SATURDAY NIGHT INTO SUNDAY MORNING WHERE A LIGHT FREEZE IS
ANTICIPATED. NORTHERLY WINDS ON SATURDAY SHIFT TO NORTHEASTERLY
SATURDAY NIGHT ADVECTING LOW-LEVEL MOISTURE BACK TO THE AREA. THIS
SHIFT TO AN ONSHORE FLOW WILL BEGIN THE WARMING TREND THAT
CONTINUES THROUGH NEXT WEEK. TEMPERATURES WILL SLIGHTLY WARM UP ON
SUNDAY, WITH HIGHS REACHING THE MID 50S TO MID 60S UNDER SUNNY
SKIES. LOWS WILL FALL TO JUST NEAR FREEZING FOR PORTIONS OF INLAND
SE GA, WITH ANOTHER ROUND OF FROST LIKELY FOR INLAND SE GA.
LONG TERM
(MONDAY THROUGH NEXT FRIDAY)
ISSUED AT 108 PM EST FRI DEC 20 2024
HIGH PRESSURE OVER NEW ENGLAND WILL STRETCH DOWN THE EASTERN
SEABOARD DEVELOPING A COASTAL TROUGH ALONG THE LOCAL ATLANTIC
COAST. HIGH PRESSURE SHIFTS EASTWARD INTO THE ATLANTIC INTO
MIDWEEK CAUSING THE LOW-LEVEL FLOW TO SHIFT FROM EASTERLY ON
MONDAY TO EAST-SOUTHEASTERLY FROM TUESDAY THROUGH THURSDAY.
TEMPERATURES WARM THROUGH THE WEEK WITH PERSISTENT ONSHORE FLOW
ADVECTING WARM, MOIST AIR ACROSS THE AREA. DUE TO THE COASTAL
TROUGH, ISOLATED SHOWERS WILL SHIFT ONSHORE TO THE I-95 CORRIDOR
MONDAY AND TUESDAY. A WEAKENING WAVE WILL PASS THROUGH THE REGION
WEDNESDAY INTO THURSDAY BRINGING THE POTENTIAL FOR SCATTERED
SHOWERS FOR CHRISTMAS.
AVIATION
(18Z TAFS)
ISSUED AT 1213 PM EST FRI DEC 20 2024
PREVAILING VFR CONDITIONS THROUGH THIS PERIOD.
MARINE
ISSUED AT 108 PM EST FRI DEC 20 2024
THE REGION WILL BE BETWEEN A DEPARTING COLD FRONT TO THE EAST
SOUTHEAST, AND STRONG HIGH PRESSURE BUILDING TO THE NORTHWEST
TONIGHT. THE GRADIENT BETWEEN THESE TWO FEATURES WILL KEEP
CONDITIONS ELEVATED THROUGH TONIGHT. THE HIGH WILL BUILD MORE TOWARD
THE NORTH THROUGH SUNDAY, THEN TOWARD THE NORTHEAST EARLY NEXT WEEK.
A COASTAL TROUGH IS EXPECTED TO DEVELOP OVER THE WATERS LATE THIS
WEEKEND INTO EARLY NEXT WEEK.
RIP CURRENTS: MODERATE THROUGH SATURDAY
PRELIMINARY POINT TEMPS/POPS
AMG 34 54 30 54 / 0 0 0 0
SSI 40 54 39 54 / 0 0 0 0
JAX 36 56 36 58 / 0 0 0 0
SGJ 42 56 42 61 / 0 0 0 10
GNV 36 57 34 62 / 0 0 0 0
OCF 37 58 36 64 / 0 0 0 0
JAX WATCHES/WARNINGS/ADVISORIES
FL...FREEZE WATCH FROM LATE SATURDAY NIGHT THROUGH SUNDAY MORNING FOR
FLZ021-023-120-220-322-422-522.
GA...FREEZE WATCH FROM LATE SATURDAY NIGHT THROUGH SUNDAY MORNING FOR
GAZ132>136-149-151>153-162-163-165-250-264-350-364.
AM...SMALL CRAFT ADVISORY FROM 9 PM THIS EVENING TO 10 AM EST
SATURDAY FOR AMZ450-452-454.
SMALL CRAFT ADVISORY UNTIL 10 AM EST SATURDAY FOR AMZ470-472-474.
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