FXUS62 KCHS 211819 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 219 PM EDT Tue Apr 21 2026

.WHAT HAS CHANGED...

All sections updated.

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.KEY MESSAGES...

- 1) Rain-free conditions dominate this week as high pressure

prevails.

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.DISCUSSION...

KEY MESSAGE 1: Rain-free conditions dominate this week as high pressure prevails.

Quiet weather conditions will remain across the region as sfc high pressure nudges across the area from the nearby Atlantic under ridging building aloft. High temps remain on track to be near normal this afternoon, peaking around the upper 70s north to lower 80s along/south of the I-16 corridor. High temps are expected to warm above normal mid to late week as a southwest wind occurs under broad ridging aloft, reaching the mid-upper 80s away from coastal areas. Unfortunately, no rainfall is forecast across the local area until a front arrives late weekend and moisture return remains modest, suggesting RH values dropping into the 20s west of I-95 each afternoon through Friday. While RH values are critical, winds are expected to top out in the 10-15 mph range (mostly near the coast with a sea breeze), thus no fire weather headlines are in effect at this time. However, its encouraged to exercise caution if burning and heed any local burn bans as conditions remain very dry during the week.

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.AVIATION /18Z TUESDAY THROUGH SUNDAY/...

VFR conditions will prevail at CHS/JZI/SAV terminals through 18Z Wednesday. However, a sea breeze will result in northeast winds turning to southwest this afternoon at all terminals, with wind speeds generally remaining below 10 kt.

Extended Aviation Outlook: VFR conditions will prevail at CHS/JZI/SAV terminals through Friday with a sea breeze likely to occur each afternoon. A few showers and/or thunderstorms could impact the terminals late Saturday.

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.MARINE...

High pressure centered across the Mid-Atlantic will slowly shift south with a weakening cold front during the next few days, favoring in a southerly flow across local waters for much of the week. Wind speeds should generally remain around 10-15 kt or less with some slight enhancement along the land/sea interface where a daily sea breeze develops, then shifts inland. Seas between 2-4 ft this afternoon (largest across outer Georgia waters) should range between 2-3 ft Wednesday through late week. A few showers and thunderstorms could arrive this weekend.

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.CHS WATCHES/WARNINGS/ADVISORIES...

GA...None. SC...None. MARINE...None.

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DPB