textproduct: Charleston

WHAT HAS CHANGED

The Freeze Warning from this morning has expired.

KEY MESSAGES

- 1) Frost/freeze is possible tonight through Wednesday night.

DISCUSSION

KEY MESSAGE 1: Frost/freeze is possible tonight through Wednesday night.

A more widespread freeze is anticipated tonight as the cold air advection regime transitions to a radiational cooling setup with mostly clear skies and diminishing winds. Some mid-20s lows are possible in rural areas across inland GA/SC. We felt confident enough to go with a Freeze Warning for most of the area. At this point we excluded Beaufort, Coastal Jasper, and the coastal zones of GA. Freezing temps could impact far inland portions of some of these zones but coverage did not seem great enough to justify a Freeze Warning. There may be just enough lingering overnight wind across these non-warning areas to preclude the need for a Frost Advisory.

Wednesday night could also feature some frost/freeze issues across the inland half of the area where temps dip to the low/mid 30s and skies remain mostly clear.

AVIATION /13Z TUESDAY THROUGH SATURDAY/

VFR conditions will prevail at KCHS, KJZI, and KSAV through 12z Wednesday. There could be a few gusts up to around 20 knots starting mid morning and going into the afternoon.

Extended Aviation Outlook: VFR conditions are expected to prevail.

MARINE

High pressure will continue to build in across the local waters today, though the pressure gradient will gradually weaken and west to northwest flow will steadily diminish. Conditions will steadily improve and we will be able to take down the remaining Small Craft Advisory the outer GA waters by midday. Thereafter, though there could be a few periods of 15-20 knots of flow, overall conditions should remain quiet and below Small Craft Advisory thresholds through the rest of the week and into the start of the weekend.

EQUIPMENT

The KCLX radar is scheduled for radome panel replacement March 17-20, 2026. The radar will be down during this time. Users are encouraged to use data from the following nearby radar sites during the maintenance outage:

KCAE - Columbia, SC KLTX - Wilmington, NC KJAX - Jacksonville, FL KVAX - Moody AFB, GA KJGX - Robbins AFB, GA

CHS WATCHES/WARNINGS/ADVISORIES

GA...Freeze Warning from midnight tonight to 10 AM EDT Wednesday for GAZ087-088-099>101-114>116-118-137-138-140. SC...Freeze Warning from midnight tonight to 10 AM EDT Wednesday for SCZ040-042>045-047-049-050-052. MARINE...Small Craft Advisory until noon EDT today for AMZ374.