Johnston, SC Warnings, Watches and Advisories

Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Johnston.

Use the Radar Maps link provided to understand the trajectory of a storm.

Special Weather Statement issued March 20 at 2:51PM EDT by NWS Greenville-Spartanburg SC

A cold front crosses the area today, bringing much drier air to the region. Increased daytime mixing lowers RH values into the 25-35% range, especially across the NC Piedmont. Gusty winds of 30-35kts expected and drier fuel moisture increases the fire danger for the area.

Lake Wind Advisory issued March 20 at 2:47PM EDT until March 21 at 8:00AM EDT by NWS Charleston SC

* WHAT...West winds 15 to 25 knots with gusts up to 30 knots and waves 1 to 2 feet expected on Lake Moultrie. * WHERE...Lake Moultrie. * WHEN...From 6 PM this evening to 8 AM EDT Friday. * IMPACTS...Strong winds and rough waves on Lake Moultrie will create hazardous conditions for small craft.

Lake Wind Advisory issued March 20 at 2:45PM EDT until March 21 at 8:00AM EDT by NWS Columbia SC

* WHAT...West winds 10 to 20 mph with gusts up to 40 mph. * WHERE...Portions of east central Georgia and central South Carolina. * WHEN...Until 8 AM EDT Friday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft.

Special Weather Statement issued March 20 at 2:44PM EDT by NWS Columbia SC

The combination of continued breezy winds and dry air on Friday raises concerns for dangerous fire behavior across the area. Very dry high pressure is expected to push through the southeastern US, with min RH values on Friday afternoon forecast to fall into the 15-20% range. Additionally, the South Carolina Forestry Commission has issued a Red Flag Fire Alert until further notice. Please act with diligence to avoid wildfires occurring on Friday.