Weekend to be one of the summer's hottest. Heat indexes near 110 degrees and record highs in the upper 90s. Little to no rain won't bring relief.
- Morning lows will be mild and consistent across the region. Far inland lows will be 73-74, central inland locations will be 74-75, intracoastal will be 76-77, and the coast will be 78-80 degrees.
- Ambient temperatures will be close to record highs Saturday afternoon. A few locations in Colleton, Dorchester, Jasper, and Hampton Counties could reach 100 degrees which would likely tie daily records there.
- Charleston Intl is forecast to reach 99 degrees and that would tie the daily record at that location.
- Most areas will reach the upper 90s around 2-4pm, and will stay in the 90s for an extended period over 6 hours.
- Rain chances will be low Saturday, however afternoon storms are possible.
- Coastal corridor has the highest chance for rain (30%). Storm coverage will be isolated and cells will be slow moving.
- Severe weather threat is low in the southern and inland counties, but Charleston, Berkeley, Williamsburg, Georgetown, and Clarendon Counties are placed within the SPC Day 1 risk for marginal severe weather conditions.
- Highest CAPE (basically thunderstorm fuel) is located in the Northeast Low Country and the coast for most of the day. A band of high CAPE should establish to the coastal side of the seabreeze by late afternoon. Storms should fire then, and may interact with favorable shear and high PWAT values.
- Cloud Cover will remain clear overnight, besides patchy fog in some locations. Valleys inland are the most probable locations for light fog.
- Cirrus will stream overhead mid morning, mainly across the southern Low Country. By afternoon cumulus will build across most inland areas.
- Heat Index is the combined effects of ambient temperature and relative humidity to determine what the temperature actually feels like
- Heat Indexes will be above 100 degrees for the entire Low Country (Possible exception on the lakes and barrier islands.
- Intracoastal Corridor will have the highest heat indexes. There, the air will feel like 107-109 degrees.
- Charleston Metro will have heat indexes above 100 degrees for multiple hours Saturday, it will be dangerous.
- Dew points will bottom out in the mid 60s before the progression of the seabreeze.
- Humidity will only be able to lower to around 70% during peak diurnal heating.
Atlantic Hurricane Season Outlook:
My friend Benjamin put together a great overview of his thoughts on the 2019 HS. Give it a read 🙂