An upper low, surface tropical wave, and a very moist atmosphere combined to produce rain in the Central Savannah River Area during the morning, which resulted in flooding of roads in Augusta.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CAE wrote it up.
An upper low, surface tropical wave, and a very moist atmosphere combined to produce rain in the Central Savannah River Area during the morning, which resulted in flooding of roads in Augusta.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Columbia, SC wrote its last area forecast discussion before the first event at Jul 29, 4:36 AM EST, 2 hours 44 minutes earlier.
Area Forecast Discussion National Weather Service Columbia SC 536 AM EDT Sat Jul 29 2023 .SYNOPSIS... Showers likely with isolated thunderstorms today, mainly in eastern SC. Very warm temperatures are expected Sunday ahead of a weak cold front that will stall near the coast by Monday morning. Isolated to scattered showers are expected mainly during the afternoon/evening through the week, with near to slightly below normal temperatures expected. && .NEAR TERM /THROUGH TONIGHT/... Weak surface low pressure will slowly lift north through the day. Deep moisture will flow into the region with PWAT values approaching 2.5 inches across portions of SC. Eastern portions of the forecast area may see rain for much of the day with moisture advection maximized around mid-day and early afternoon. Numerous showers are expected across the southern and eastern Midlands with scattered showers elsewhere. Overcast skies should keep temperatures below normal and limit conditional instability. Highs will be in the mid to upper 80s. We still should see some isolated thunderstorms but showers are more likely. As the inverted trough lifts northward along the coast the deepest moisture shifts away from the FA later in the afternoon and evening. This should lead to diminishing shower activity during the evening and overnight with only a few lingering showers after midnight. The unknown in the evening/overnight period will be convection to the north, triggered along a cold front in the Mid Atlantic region. Thunderstorms should sink southward through NC in the late afternoon. There is some indications in the CAMs that the convection may push into the forecast area in the evening but the majority of HREF ensemble members show the storms dying out near the northern FA. This seems reasonable given the limited instability available in central SC. For now we'll keep a chance of thunderstorms in the forecast for the northern FA this evening but we'll need to monitor the convection to the north as it unfolds today. A saturated airmass and a tall, skinny CAPE profile indicates a limited threat of severe weather and instead points to a threat of localized flash flooding in slow moving cells. Overnight lows will be near normal. && .SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/... Sunday and Sunday night: Weak upper disturbance over the forecast area will shift to the east on Sunday as an upper trough digs into the Ohio Valley as northwesterly flow increases across the region. Hi-res guidance is mixed in the extent of convective coverage on Sunday with the HRRR keeping the forecast area generally rain free but FV3 and NSSL WRF showing some convection during diurnal peak heating developing to our northwest and moving into the region with the northwesterly flow. Will continue to carry chance pops focused in the northern and eastern half of the forecast area closer to the deeper moisture and shortwave energy. Temperatures should rebound to above normal with highs in the mid to upper 90s as 850mb temps rise to around +22C to +23C aided by some developing northwesterly flow. The northwesterly flow should help dewpoints to mix out a bit better, but they will remain high enough combined with the very warm temperatures to result in some heat indices in the 105-109 range, especially across the eastern Midlands. Temperatures Sunday night will fall into the lower to mid 70s as a weak surface front pushes through the area to the coast. Monday and Monday night: A drier air mass descends on the region Monday as the forecast area remains on the southwestern periphery of the upper trough over New England into the Mid- Atlantic with PWATs falling below 1.5 inches. Despite the drier air, northwesterly flow may bring some weak shortwave energy into the region with enough instability to support isolated to scattered convection favoring the eastern Midlands closer to the deeper moisture and stalled frontal boundary. Temperatures will be slightly cooler than Sunday but still warm in the lower to mid 90s. && .LONG TERM /TUESDAY THROUGH FRIDAY/... Reasonable agreement among the global ensembles favoring a strong upper ridge over the middle of the country with upper troughing over New England and the Mid-Atlantic through mid week. The forecast area will remain on the southwesterly fringe of the upper trough with persistent northwesterly 500mb flow. Ensembles show below normal mean PWATs through Wednesday which will limit convective potential then PWATs increase again to end the week as the 500mb flow becomes more westerly as the upper trough lifts away from New England and Mid-Atlantic. Pops favor the eastern Midlands and CSRA Tue/Wed and remain low, then pops increase a bit by the end of the week with increased moisture. Temperatures during the period should be near normal. && .AVIATION /12Z SATURDAY THROUGH WEDNESDAY/... Surface low pressure will lift north today pulling deep moisture into the area. This should lead to MVFR/IFR ceilings this morning and potentially reduced vsbys at fog prone AGS and OGB. Expect an uptick in shower activity by mid morning as the deeper moisture approaches OGB, and the Augusta sites. Temporary restrictions from showers will be probable for much of the day at AGS, DNL and OGB with lower confidence at the Columbia terminals. Shower activity will begin to diminish during the late afternoon and evening as the surface low shifts away from the area. We can't rule out showers during the evening and overnight period but lower coverage limits confidence. Abundant low level moisture Saturday night will likely lead to a period of fog/stratus near the end of the 24 hr TAF period. EXTENDED AVIATION OUTLOOK...Scattered showers and thunderstorms Sunday afternoon. Chance of stratus and fog Monday morning but drier air will limit restriction chances through the end of the extended. && .CAE WATCHES/WARNINGS/ADVISORIES... GA...None. SC...None. &&
Hazardous Weather Outlook National Weather Service Columbia SC 411 AM EDT Sat Jul 29 2023 GAZ040-063>065-077-SCZ016-018-020>022-025>031-035-037-038-041-115- 116-135>137-300815- Lincoln-McDuffie-Columbia-Richmond-Burke-Chesterfield-McCormick- Newberry-Fairfield-Kershaw-Edgefield-Saluda-Lexington-Richland-Lee- Aiken-Sumter-Barnwell-Calhoun-Clarendon-Bamberg-Northern Lancaster- Southern Lancaster-Northwestern Orangeburg-Central Orangeburg- Southeastern Orangeburg- 411 AM EDT Sat Jul 29 2023 This Hazardous Weather Outlook is for the Midlands of South Carolina and the Central Savannah River area of Georgia. .DAY ONE...Today and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Sunday through Friday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Columbia radar (KCAE), 94 km away, was scanning. The volume nearest the first event began at 12:21 UTC.
1 flash flood. Local standard time, as filed.
Laney Walker Blvd Ext at E Boundary St, and E Boundary St and Sibley St, were closed due to flooding. Time estimated.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Georgia in 2023Every state in 2023This day in weather historyWarnings in Georgia, July 2023
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1105285.