textproduct: Charleston

WHAT HAS CHANGED

The Aviation section was updated.

KEY MESSAGES

- 1) Hot and humid conditions are expected across the area this weekend and through early next week. Heat Advisories could be needed.

DISCUSSION

KEY MESSAGE 1: Hot and humid conditions are expected across the area this weekend and through early next week. Heat Advisories could be needed.

Surface high pressure will persist across the western Atlantic through the period, favoring southwest to south flow that will support dew points well in the 70s and afternoon high temperatures in the mid 90s each day. Widespread peak heat index values above 100 degrees are expected daily across southeast South Carolina and southeast Georgia. A swath of 105 to near 110 degree heat indices are possible along and east of the I-95 corridor where dew points in the upper 70s and perhaps low 80s could occur. The need for Heat Advisories in these locations will likely be evaluated on a day-to- day basis through the middle of next week.

Convective coverage could become more numerous next week as an inland trough lingers nearby and a cold front approaches from the northwest. Increased cloud cover and earlier thunderstorm development could temper daytime heating if convection develops during the peak heating hours.

AVIATION /00Z SATURDAY THROUGH WEDNESDAY/

00Z TAFs: VFR. The formation of the sea breeze Saturday afternoon will cause winds to increase and become gusty. Additionally, there will a risk of convection with the sea breeze. Though, these details will need to be refined more in future TAFs.

Extended Aviation Outlook: Predominately VFR conditions through the period, however there is a low chance of brief flight restrictions each afternoon and evening from showers and thunderstorms developing along the sea breeze.

MARINE

Tonight through Wednesday: The pattern will continue to feature the subtropical high to the east and a trough inland. This setup should favor moderate south to southwest flow each day, with flow surging a bit each afternoon and evening with the development of the sea breeze. During the peak surge each day, winds will get into the 15- 20 knot range with gusts up to around 25 knots possible primarily across the SC waters and in Charleston Harbor. Seas should generally be in the 2-4 ft range, except up to around 5 ft in response to surging winds across the Charleston County waters. It's possible we could need short duration Small Craft Advisories at times, mainly in the Charleston County waters and maybe even Charleston Harbor. The National Hurricane Center continues to highlight an area in the northeast Gulf with a low chance (30%) of development through the next 7 days. If this low were to develop and track up the Southeast coast, there could be additional wind and sea concerns for the local waters.

CLIMATE

Record High Minimum Temperatures:

July 17: KCHS: 79/2025

July 18: KCHS: 79/2007 KCXM: 81/2007

July 19: KCHS: 79/1986 KCXM: 83/1986

July 20: KCHS: 79/2025 KCXM: 83/2000 KSAV: 79/1942

July 21: KCHS: 80/1986 KCXM: 83/1998

July 22: KCHS: 81/2011 KCXM: 83/2011

CHS WATCHES/WARNINGS/ADVISORIES

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