Deep moisture and light winds led to conditions favorable for morning waterspouts. Warm and moist conditions in advance of an arriving mid level trough of low pressure, nose of an upper level jet, and inland moving sea breeze circulation, favored an environment conducive for severe thunderstorms during afternoon hours.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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 CHS wrote it up.
Deep moisture and light winds led to conditions favorable for morning waterspouts. Warm and moist conditions in advance of an arriving mid level trough of low pressure, nose of an upper level jet, and inland moving sea breeze circulation, favored an environment conducive for severe thunderstorms during afternoon hours.
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 Charleston, SC wrote its last area forecast discussion before the first event at Aug 21, 3:04 PM EST, 12 minutes earlier.
Area Forecast Discussion National Weather Service Charleston SC 404 PM EDT Sun Aug 21 2022 .SYNOPSIS... Several disturbances will linger across our region this week. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/... KCLX detected scattered to numerous showers and thunderstorms along and east of I-95 across the SC Lowcountry. Additional cells should develop later this afternoon and evening as outflow boundaries spread out across the forecast area and the sea breeze pushes inland. Latest SPC mesoanalysis indicated that MLCAPE ranged around 2000 J/kg, with low values of CIN lingering off the SC coast. Recent runs of the HRRR and HREF indicate that coverage will categorical across portions of the CWA late this afternoon into this evening. Given PW values around 2.2 inches and slow storm motions, a few areas could experience flooding of low lying or other poor drainage locations. In addition, a few strong thunderstorms are possible through early this evening. Convection should continue across through land-based zones through this evening, then should slowly shift over the coastal waters late tonight. Low temperatures are forecast to range in the low to mid 70s tonight. && .SHORT TERM /6 AM MONDAY MORNING THROUGH WEDNESDAY/... An unsettled weather pattern will persist across our area. The mid- levels will consist of a trough gradually strengthening/amplifying over the East Coast into Tuesday, with signs that it's axis may reform to the west on Wednesday. At the surface, High pressure will remain far to our east in the Atlantic. Meanwhile, a surface trough should either be to our west or overhead Monday and Tuesday afternoon. Additionally, a cold front will be approaching from the northwest late Monday into Tuesday. The front may be located just to our northwest by late Wednesday, or possibly beginning to move through our area. A deep plume of moisture will remain across region, with PWATs at least 2", and at times up to 2.25", which is well above normal for this time of year. All of this moisture combined with the mid-level and surface features, along with a weak afternoon sea breeze will lead to afternoon and evening convection. The convection may decrease a bit in coverage and intensity during the overnights and early mornings, but it's not expected to completely go away and dry out. Hence, we have POPs as high as likely during the days and generally in the chance category each night. It's difficult to determine the exact timing and location of the convection and rainfall as this will best be determined during the near term. The main concern each day will be the potential for locally heavy rainfall, which could lead to flooding in low- lying and poorly drained areas. The flood potential should worsen with each passing day as the ground gets more saturated. The overall severe potential appears to be rather low due to limited instability, that actually drops with each passing day. But if any severe storms due manage to form, damaging winds would be the most likely hazard. Temperatures will be a few degrees below normal due to the abundant clouds and precipitation. && .LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/... Broad mid-level troughing is expected to prevail over the East Coast through Thursday. Heights start to rise on Friday as weak ridging builds across the southern U.S. The ridge strengthens/amplifies over the weekend. At the surface, High pressure will prevail far to our east in the Atlantic. Meanwhile, a weak cold front will slowly approach from the northwest Wednesday night into Thursday. The front is expected to move through our area late Thursday, then transition to a stationary front just off our coast, where it could remain Friday through early next week. Deep moisture will be in place ahead of the front, and nearby over the weekend. This pattern will bring our area unsettled weather in the form of showers/thunderstorms, especially each afternoon and evening. For this reason, high temperatures should remain a few degrees below normal. && .AVIATION /20Z SUNDAY THROUGH FRIDAY/... Prior to the 18Z TAFs, the terminals have warmed to the convective temperature and the cumulus field has started to develop. KCLX detected a few showers and isolated thunderstorms across portions of the SC Lowcountry and SE GA. Steering flow should result in the convection to near the coast by 20Z. High resolution guidance indicates that new convection will develop along the coast late this afternoon into this evening, highlighted with TEMPOs generally from 20-1Z. Showers should linger across the terminals through most of the evening, pushing off the coast after midnight. On Monday, the day should start with light SW winds and VFR conditions. However, by mid-morning showers should develop near the terminals, highlighted with VCSH by 15Z. Extended Aviation Outlook: Periodic flight restrictions are likely due to showers and thunderstorms, especially each afternoon/evening. && .MARINE... The sfc pattern across the marine zones will support SSW winds between 10 to 15 kts tonight. Seas are forecast to gradually increase to 2 to 3 ft. Extended Marine: An unsettled weather pattern will persist. Atlantic High pressure will remain far to our east while several surface troughs or weak fronts gradually move through the Southeast. In general, winds should mostly be from the SW 15 kt or less through Tuesday, then shifting around to the SE or E Wednesday and Thursday. Seas will average 2-3 ft. Additionally, showers/thunderstorms should bring brief impacts to the coastal waters throughout the extended marine period. && .CHS WATCHES/WARNINGS/ADVISORIES... GA...None. SC...None. MARINE...None. && NEAR TERM...NED SHORT TERM... LONG TERM... AVIATION...NED MARINE...
Hazardous Weather Outlook National Weather Service Charleston SC 407 AM EDT Sun Aug 21 2022 GAZ087-088-099>101-114>119-137>141-SCZ040-042>045-047>052-220815- Jenkins-Screven-Candler-Bulloch-Effingham-Tattnall-Evans- Inland Bryan-Coastal Bryan-Inland Chatham-Coastal Chatham-Long- Inland Liberty-Coastal Liberty-Inland McIntosh-Coastal McIntosh- Allendale-Hampton-Inland Colleton-Dorchester-Inland Berkeley- Inland Jasper-Beaufort-Coastal Colleton-Charleston-Coastal Jasper- Tidal Berkeley- 407 AM EDT Sun Aug 21 2022 This Hazardous Weather Outlook is for southeast Georgia and southeast South Carolina. .DAY ONE...Today and tonight. Heavy Rainfall: Several rounds of showers and thunderstorms will impact the region this afternoon through tonight. Heavy rainfall is possible along with some localized flooding, especially in low-lying and poorly drained areas. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Heavy Rainfall: Considerable moisture will persist across the area through early this week, resulting in showers and thunderstorms. Periods of heavy rainfall are expected and flooding could occur, especially in low-lying and poorly drained areas. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time. AMZ330-350-352-354-374-220815- Charleston Harbor- Waters from South Santee River to Edisto Beach SC out 20 NM- Waters from Edisto Beach SC to Savannah GA out 20 NM- Waters from Savannah GA to Altamaha Sound GA out 20 NM, including Grays Reef National Marine Sanctuary- Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM- 407 AM EDT Sun Aug 21 2022 This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...Today and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time.
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</html>The Charleston,SC radar (KCLX), 118 km away, was scanning. The volume nearest the first event began at 20:42 UTC.
1 strong wind, 1 thunderstorm wind, 1 lightning. Local standard time, as filed.
WATERSPOUT. Location: 33.1060N, 79.9560W. The local media relayed a video from the public of a waterspout with no discernable damage on the Cooper River near the Pimlico Rice Field neighborhood.
A Beaufort County 911 Call Center reported a tree down and blocking the road along Pinckney Colony Boulevard.
The Beaufort County 911 Call Center reported a lightning strike to a multi-story apartment complex along Parklands Drive, resulting in a hole in the attic where rain entered and eventually reached the lower levels.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Carolina in 2022Every state in 2022This day in weather historyWarnings in South Carolina, August 2022
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 2026-10-01. Each event’s entry at NCEI: 1042157, 1047140, 1047142.