August 10th, 2019: Record Heat Stifles Low Country

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.

8-10-19 TI



  • 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.

Precipitation/Cloud Cover:

  • 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/Humidity:

  • 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 đŸ™‚

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