textproduct: Charleston

WHAT HAS CHANGED

Aviation section updated for the 0Z TAFs.

KEY MESSAGES

- 1) A slow-moving front will drift into the area from the north and bring increased chances for showers and thunderstorms Friday into the weekend. Locally heavy rainfall will be possible and could bring a risk of flooding to portions of our area.

DISCUSSION

KEY MESSAGE 1: A slow-moving front will drift into the area from the north and bring increased chances for showers and thunderstorms Friday into the weekend. Locally heavy rainfall will be possible and could bring a risk of flooding to portions of our area.

A cold front will slowly drift southward towards our region on Friday, then transition into a stationary front over or nearby through the weekend. There will be deep moisture associated with this front. PWATs could make a run for 2.5" this weekend, which is well above the 90% mark for CHS Sounding Climatology, and may be approaching 3 standard deviations per NAEFS. This deep moisture combined with lift from the front will generate widespread showers and embedded thunderstorms. Efficient rainfall production, especially within thunderstorms, will increase the potential for localized flooding. While most flooding impacts are expected to remain minor, repeated heavy downpours over urban areas, such as the Charleston or Savannah Metro areas, could warrant Flood Advisories and/or Flash Flood Warnings. Rainfall totals of 1-3" appear likely, especially across parts of southeast South Carolina and lesser amounts across southeast Georgia. Locally higher amounts will occur where there is training of thunderstorms. The Weather Prediction Center (WPC) highlighted portions of our area with a Slight Risk for excessive rainfall Friday and Saturday.

AVIATION /00Z FRIDAY THROUGH TUESDAY/

0Z TAFs: Conditions across the terminals will remain dry with light SW winds. Recent runs of the HRRR and HREF indicates that scattered to numerous showers and thunderstorms will develop along a sea breeze across KCHS and KJZI between 18-22Z. These storms will tap into moderate instability and very deep moisture, creating torrential downpours. Conditions during thunderstorms could rapidly become restrictive. The TAFs will highlight the potential for thunderstorms with TEMPOs from 18-20Z at KCHS and KJZI, one hour later at KSAV.

Extended Aviation Outlook: A front nearby will bring periods of flight restrictions within showers/thunderstorms.

MARINE

Tonight through Tuesday: Light to moderate winds should continue across our waters tonight as a cold front approaches from the north. It'll transition into a stationary front over or nearby this weekend, yielding increased showers and thunderstorms. Despite the front, marine conditions should remain below Small Craft Advisory criteria.

Rip Currents: There is a Moderate Risk for rip currents for the Charleston County beaches through this evening.

CLIMATE

Record High Temperatures:

July 29: KCHS: 100/1993 KCXM: 99/1999

Record High Minimum Temperatures:

July 23: KCHS: 80/1991 KCXM: 83/1952

July 24: KCHS: 81/2024

July 25: KCHS: 80/2011 KCXM: 82/2016 KSAV: 80/1893

July 26: KCHS: 78/2025 KSAV: 80/1884

July 28: KCHS: 80/2025

July 29: KCHS: 80/2016 KSAV: 82/1878

CHS WATCHES/WARNINGS/ADVISORIES

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