A surface trough, associated with a complex occluded low over Pennsylvania, triggered late Monday afternoon convection in the moist unstable air over the Midlands. A CoCoRaHS volunteer in Gilbert observed 1.52 inches of afternoon rain in 40 minutes. Thunderstorms migrated to the coast by early evening. The Marine Corp Air Station in Beaufort received 2.31 inches. The Cades 4 W COOP observer recorded a 24 hour precipitation total of 3.29 inches.
A pre-frontal surface trough tracked over the state Tuesday triggering more thunderstorm activity. Scattered thunderstorms developed during the afternoon. The largest concentration of thunderstorms occurred over the southern counties of the Low Country. A Bluffton CoCoRaHS observer reported a 2.48 inch rainfall total. The Columbia Metro Airport observed a high temperature of 96 degrees.
A cool front passed over the state Tuesday night, reaching Beaufort County by daybreak. North of this front, the Columbia Owens Downtown Airport and the Florence Regional Airport reached a high temperature of 90 degrees. Both airports also reported trace amounts of precipitation.
High pressure over the state Wednesday and Thursday maintained relatively tranquil afternoons free of any significant convection. The Charleston Air Force Base reported a high temperature of 85 degrees and 0.91 inches of rainfall Wednesday. The Greenville-Spartanburg Airport received a localized rainfall of 0.61 inches and recorded a high temperature of 90 degrees on Thursday. Inland airports reported morning low stratus clouds and fog Thursday and Friday. Orangeburg Municipal Airport and Barnwell Regional Airport reported Friday morning visibilities down to a quarter mile.
A pre-frontal trough and diurnal heating caused an outbreak of strong thunderstorms late Friday afternoon. The National Weather Service Office in Greer logged dozens of reports of downed trees, powerlines and overturned Porta-Potties following Friday's afternoon storms. The Anderson County Airport recorded a 51 m.p.h. wind gust, 0.36 inches of rain, and an afternoon high temperature of 91 degrees. CoCoRaHS observers in Rock Hill and York reported respective rainfall amounts of 1.85 and 1.36 inches. The Columbia Metro Airport and MCAS Beaufort reached a temperature of 94 degrees.
Cool, dry Canadian high pressure settled over the state for the weekend. The COOP observer in Dillon reported the state's Saturday high temperature of 93 degrees. Scattered rainshowers were touched off by Saturday's passage of a cold front. The Greenville Downtown Airport received 0.01 inches while the North Myrtle Beach Airport received 0.20 inches. Mullins saw 1.28 inches of Saturday rain. Sunday, the Columbia Metro Airport and the Greenwood County Airport reached a high temperature of 88 degrees after morning low temperatures of 71 and 63 degrees respectively. The state's low temperature Sunday was 57.9 degrees on Sassafras Mountain. There were no reports of rain on Sunday.
(Note: The highest and lowest official temperatures and highest precipitation totals provided below are based on observations from the National Weather Service Cooperative Observer network and the National Weather Service's Forecast Offices.)
The highest official temperature reported was 96 degrees at the Columbia Metro Airport on July 25.
The lowest official temperature reported was 57.9 degrees on Sassafras Mountain on July 30.
The heaviest official 24-hour rainfall reported was 3.29 inches at Cades 4 W.
The state average rainfall for the seven-day period was 0.9 inches.
| Weekly | Jan 1 | Departure | |
|---|---|---|---|
| Anderson AP | 0.32 | 35.02 | 9.0 |
| Greer AP | 1.13 | 34.22 | 6.4 |
| Charlotte, NC AP | 0.70 | 29.67 | 5.4 |
| Columbia Metro AP | 0.39 | 34.83 | 8.4 |
| Orangeburg AP | 0.59 | 24.94 | -3.0 |
| Augusta, GA Bush AP | 0.66 | 28.51 | 2.1 |
| Florence AP | 0.05 | 28.03 | 3.0 |
| N Myrtle Beach AP | 0.32 | 19.13 | -8.6 |
| Charleston AFB | 2.83 | 30.27 | 2.0 |
| Savannah, GA AP | 1.59 | 36.61 | 9.0 |
Weekly rainfall totals ending midnight Sunday.
4-inch depth soil temperature: Clinton 77 degrees. Columbia 80 degrees. Barnwell 75 degrees. Mullins 65 degrees.
Most South Carolina river stages were normal. Several Upstate rivers were below to much below normal.
Charleston Harbor water temperature: 84 degrees.
Fripp Nearshore Buoy (Station 41033): 82.2 degrees.
