textproduct: Charleston

WHAT HAS CHANGED

Key Message 1 has been added for fog potential early this morning. The Aviation Section has been updated to include fog potential.

KEY MESSAGES

- 1) Patchy to areas of fog possible across Southeast South Carolina through daybreak this morning.

- 2) Dry conditions and seasonable temperatures expected this weekend and into next week.

DISCUSSION

KEY MESSAGE 1: Patchy to areas of fog possible across Southeast South Carolina through daybreak this morning.

Latest satellite imagery and sfc obs indicate visibilities have lowered below 1 mile in some spots across the Tri-County Area and Colleton County early this morning, mainly due to shallow fog. Condensation pressure deficits remain low in areas that experienced rainfall within the last 12-24 hours while light/calm winds persist with high pressure filtering into the region. The setup remains favorable for patchy to areas of fog occurring across the area previously noted with a few spots possibly experiencing locally dense fog near low-lying locations through daybreak. A Special Weather Statement could eventually be needed to address locally dense fog.

KEY MESSAGE 2: Dry conditions and seasonable temperatures expected this weekend and into next week.

Dry high pressure will build across the Southeast United States this weekend and prevail through early next week. Cold air advection post fropa will set the stage for noticeably cooler temps today and Sunday, although are expected to remain above normal for afternoon highs, generally in the mid-upper 70s this afternoon, then low-mid 70s Sunday afternoon. Overnight periods will feature cooler temps as well while high pressure settles across the area, sfc winds become rather light, and a fair amount of radiational cooling takes place under more substantial clearing. In general, temps should dip into the mid 40s inland to mid-upper 50s near the coast tonight, then a few degrees cooler Sunday night.

High pressure will reside across the Southeast early into the middle of next week, setting the stage for rebounding temps as a west flow becomes more pronounced across the local area. In general, afternoon highs should return to the mid-upper 70s. However, light winds and radiational cooling nights will continue to support lows in the low- mid 40s inland to low-mid 50s near coastal areas into the middle of next week.

AVIATION /07Z SATURDAY THROUGH WEDNESDAY/

Light northwest flow is expected at all terminals tonight while a cold front shifts further offshore and away from the area. Recent amendments to the CHS/JZI have been made to address a patchy to areas of fog developing across the area, some of which could become dense at times in a rather thin layer. TEMPO groups with 1/4 to 1/2SM vsbys due to fog have been included at CHS through 12Z this morning. MVFR conditions continue at JZI through 12Z as well this morning, although could eventually experience vsbys below 1SM as well approaching daybreak. Conditions improve to VFR thereafter with a north-northeast flow setting up during the day. VFR conditions are expected to prevail at SAV through 06Z Sunday.

Extended Aviation Outlook: Prevailing VFR conditions are expected at CHS/JZI/SAV terminals.

MARINE

Behind the cold front that pushed through yesterday, west- northwesterly winds will become north-northeasterly throughout the morning hours. As this occurs, the winds will become increasingly breezy with gusts ranging from 15 to 20 knots, highest across the South Carolina offshore (20-60nm zones) waters, and weakest in the nearshore Georgia waters. Seas of 3 to 5 feet are expected. Winds remain intermittently breezy overnight into Sunday, with gusts increasing back into the 15 to 20 knot range throughout the daytime hours. Thereafter, winds and seas should gradually diminish into early next week with generally quiet conditions and no marine hazards expected.

CHS WATCHES/WARNINGS/ADVISORIES

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