textproduct: Charleston

WHAT HAS CHANGED

All sections have been updated.

KEY MESSAGES

- 1) Hot and humid conditions will persist along portions of our coast the rest of today. A Heat Advisory is in effect for McIntosh County.

- 2) Isolated to scattered thunderstorms may develop along our southeast Georgia coast this afternoon. A couple of strong to marginally severe storms will be possible into the evening hours, especially near the Altamaha River.

DISCUSSION

KEY MESSAGE 1: Hot and humid conditions will persist along portions of our coast the rest of today. A Heat Advisory is in effect for McIntosh County.

Along our southeast Georgia coast, temperatures are in the mid to upper 90s, while dewpoints are in the mid to upper 70s. These locations are experiencing heat index values around 105 degrees. The highest values (up to 110 degrees) are across McIntosh County, which is where we have a Heat Advisory in effect until this evening.

KEY MESSAGE 2: Isolated to scattered thunderstorms may develop along our southeast Georgia coast this afternoon. A couple of strong to marginally severe storms will be possible into the evening hours, especially near the Altamaha River.

A stationary front is located in the vicinity of the Altamaha River this afternoon. North of the front, dewpoints have fallen into the low to mid 60s. South of the front, they are generally in the 70s, along with temperatures in the mid to upper 90s. SPC Mesoscale Analysis in this area generally has MLCAPEs in the 500-1,000 J/kg range, DCAPEs around 1,000 J/kg, and effective bulk shear of 25-30 kt. But the CAMs aren't showing much convection and this is confirmed by satellite imagery, which hasn't shown much vertical cumulus development. So there will be a short window this afternoon where there could be isolated scattered strong to marginally severe storms (with the main threat being damaging wind gusts) along the sea breeze. Once sunset arrives, any storms will quickly dissipate.

AVIATION /00Z FRIDAY THROUGH TUESDAY/

00Z TAFs: VFR conditions will prevail throughout the forecast with light and variable winds. Winds will gradually increase tomorrow afternoon out of the south as a seabreeze slowly moves inland reaching JZI by 15z and SAV/CHS by around 18 to 19Z. Isolated to scattered showers and thunderstorms will be possible between 18 to 21Z at SAV. Temporary restrictions in flight conditions could be possible as far north as CHS; however, confidence in coverage is too low to support a mention in the TAF.

Extended Aviation Outlook: The probabilities for periodic flight restrictions due to showers and thunderstorms will gradually increase Friday through early next week.

MARINE

A stationary front will linger across our southeast South Carolina and southeast Georgia waters through the rest of this week, bringing fairly light winds and low seas. A stronger front is expected to move through early next week, causing winds and seas to increase. Wind gusts could approach 25 kts across some of our waters on Sunday, along with 5-6 ft seas. Therefore, Small Craft Advisories may be needed. Conditions should gradually improve on Monday.

CLIMATE

Record High Minimum Temperatures:

August 1: KSAV: 79/2020

August 4: KSAV: 78/1941

August 5: KCHS: 79/1980 KCXM: 82/1991

CHS WATCHES/WARNINGS/ADVISORIES

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