The low pressure and an associated cold front continued to move away from the region on Monday, April 20. Isolated showers continued through the early morning hours, before drier air returned across the state. The 24-hour rainfall totals across the state ranged from less than a quarter of an inch in the Pee Dee to over five inches in portions of coastal Beaufort, Charleston, and Colleton counties. A CoCoRaHS observer in Sheldon in Beaufort County measured 5.11 inches. Temperatures rose from the 60s into the 70s under mostly cloudy skies. By Tuesday, high pressure moved into the region with drier conditions and seasonable temperatures through Wednesday. Reported lows were in the 40s, though some locations at higher elevations dropped into the 30s, with daytime temperatures rebounding into the upper 70s to low 80s.
By Thursday, the high pressure had transitioned offshore ahead of another storm system that moved through the area, bringing the potential for severe weather through the evening hours. Thunderstorms produced heavy rainfall in the Charleston area. Between four to six inches fell during the evening hours causing localized flooding in low-lying areas. The National Weather Service (NWS) station in downtown Charleston reported a 24-hour rainfall total of 3.34 inches, breaking the previous daily record of 2.22 inches set back in 2018. There were multiple reports of strong winds causing downed trees across parts of the Midlands.
The return to fair weather on Friday was short-lived as another surface low pressure crossed the Upstate on Saturday producing supercell thunderstorms. These storms dropped golf-ball-sized hail throughout the area, from Oconee to York counties. One of the supercells spawned an EF2 tornado, with maximum wind speeds of 115 mph, in the suburbs of eastern Greenville that tracked toward the Taylors area. More seasonable conditions returned across the state on Sunday as the cold front cleared the region. Behind the system, breezy conditions prompted the NWS to issue lake wind advisories as sustained winds of 20 mph and gusts up to 35 mph affected the state.
(Note: The highest and lowest official temperatures and highest precipitation totals provided below are based on observations from the National Weather Service (NWS) Cooperative Observer network and the National Weather Service's Forecast Offices.)| Weekly* | Since Jan 1 | Departure | |
|---|---|---|---|
| Anderson Airport | 1.10 | 25.07 | 10.3 |
| Greer Airport | 1.76 | 25.88 | 10.7 |
| Charlotte, NC Airport | 2.37 | 18.91 | 5.5 |
| Columbia Metro Airport | 0.68 | 17.82 | 4.6 |
| Orangeburg Airport | 1.05 | 15.05 | 0.9 |
| Augusta, GA Airport | 1.99 | 21.78 | 7.3 |
| Florence Airport | 0.37 | 15.18 | 3.4 |
| North Myrtle Beach Airport | 0.82 | 15.72 | 2.1 |
| Charleston Air Force Base | 2.49 | 17.50 | 4.6 |
| Savannah, GA Airport | 4.82 | 20.69 | 7.8 |
| *Weekly precipitation totals ending midnight Sunday. M - denotes total with missing values. |
4-inch depth soil temperature: Clinton: 59 degrees. Columbia: 66 degrees. Barnwell: 61 degrees. Mullins: Not Available.
Multiple rounds of heavy rain fell across much of the Lowcountry and portions of the Upstate. Between the first round of rainfall ending the morning of Monday, April 20, and the additional rain from the evening of April 23 many locations in the Lowcountry recorded more than five inches of rain, with some localized areas reporting as much as eight inches. In the Upstate, areas north of the Interstate 85 corridor measured more than two inches, with more isolated locations observing close to four inches. Elsewhere across the state, rainfall ranged from half an inch to an inch and a half.
After the initial surge in river heights due to the added rainfall in the basins, most of the river gauges dropped back out of the flood stage. Only a few gauges along portions of the Santee and Savannah rivers near the coast were at major and minor flood stage. Streamflow levels across much of the state remained normal due to the multiple weeks of rain that fell during the previous periods. However, the lack of general rainfall across the Pee Dee Basin caused a drop in streamflow values along some of the rivers, including the Little Pee River near Galivants Ferry.
