Alert archive / South Carolina / Flash Flood Warnings in 2024

Flash Flood Warning 15, NWS Charleston, SC

August 9, 2024Berkeley County, Charleston County, Dorchester County, South Carolina

NWS Charleston, SC issued this flash flood warning at Aug 9, 2024, 1:29 AM EDT for Berkeley County, Charleston County, Dorchester County, South Carolina. It was in force for 8 hr. 13 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 9, 2024, 1:29 AM EDT (05:29 UTC)
Expired
Aug 9, 2024, 9:00 AM EDT
In force
8 hr
Issued by
NWS Charleston, SC
Area
Storm-based polygon
Emergency
Flash flood emergency
Damage threat
Catastrophic
Flood severity
None

Counties Berkeley County, SC, Charleston County, SC, Dorchester County, SC

The radar

The Charleston,SC radar (KCLX), 122 km from the middle of the area, began a volume at 05:29 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Aug 9, 1:30 AM EDTFLOOD7 Sw Moncks Corner, SCThe public reported 4.12 inches of rainfall in two hours and 30 minutes at 400 block of Rowley Lane Cane Bay.
Aug 9, 1:30 AM EDTRAIN 4.127 Sw Moncks Corner, SCThe public reported 4.12 inches of rainfall in two hours and 30 minutes at 400 block of Rowley Lane Cane Bay.
Aug 9, 2:35 AM EDTFLASH FLOOD1 Ese Moncks Corner, SCA video was relayed of a flooded house on Fairlawn Drive in Moncks Corner.
Aug 9, 3:15 AM EDTFLASH FLOODMoncks Corner, SCEmergency officials in Moncks Corner reported that high water rescues are in progress. Homes are flooded throughout the city and roads are closed due to 2-3 feet of fast moving water.
Aug 9, 4:00 AM EDTFLASH FLOODMoncks Corner, SCEmergency management reported approximately 30 swift water rescues occurred within Berkeley County, mainly in Moncks Corner. No injuries have been reported.
Aug 9, 4:25 AM EDTFLASH FLOODMoncks Corner, SCEmegency Manager reported a tree blocking the Haynesville Ext due to flood flashing and thunderstorm wind.
Aug 9, 4:43 AM EDTRAIN 8.887 Sw Moncks Corner, SCA spotter reported 8.88 inches of rain has fallen in Cane Bay during the last 6 hours.
Aug 9, 6:08 AM EDTFLASH FLOOD5 N Sangaree, SCA picture on social media shows a stranded car in flood waters located on Nexton Pkwy and Pine Hollow Dr. Two occupants were rescued from vehicle with no reported injuries.
Aug 9, 6:59 AM EDTFLOOD3 N Ridgeville, SCSocial media video shows two lanes of I-26 southbound with 1-2 ft of flood water near the Highway 27 exit. In addition, Highway 27 was flooded.
Aug 9, 7:47 AM EDTFLOOD6 Nne Sangaree, SCTrained spotter reported water covering roadway along the 300 block of Waterlily Way.
Aug 9, 8:44 AM EDTFLASH FLOOD5 Ssw Dorchester, SCEmergency manager shared a picture of paved Wire Road washed out near the intersection of Zion Road.
Aug 9, 9:00 AM EDTFLASH FLOODSummerville, SCEmergency manager and media reported at least 75 roads closed due to flooding across Dorchester County this morning. A slightly larger amount of closures seemed to be near Harleyville, Summerville, and along the Edisto River.
Aug 9, 9:05 AM EDTFLOOD7 N Sangaree, SCTrained spotter reported water covering roadway near Lake Ridge Blvd in the Pine Hills subdivision of Cane Bay. Caused by the overflow of Sandy Run Creek due to flooding.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 7 storm reports to this flash flood warning; the first came 66 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 5.5 hours before the alert went out and 33 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Charleston AFB, SC at 00:00Z on 2024-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 102 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 00:00Z on 2024-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
102 J/kg
Mixed-layer CIN
-87 J/kg
Mixed-layer LCL
956 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

The text

As transmitted.

056 
WGUS52 KCHS 090529
FFWCHS
SCC015-019-035-090930-
/O.NEW.KCHS.FF.W.0015.240809T0529Z-240809T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Charleston SC
129 AM EDT Fri Aug 9 2024

...FLASH FLOOD EMERGENCY FOR MONCKS CORNER...

The National Weather Service in Charleston has issued a

* Flash Flood Warning for...
  Berkeley County in southeastern South Carolina...
  Charleston County in southeastern South Carolina...
  Dorchester County in southeastern South Carolina...

* Until 530 AM EDT.

* At 129 AM EDT, Doppler radar numerous showers and thunderstorms 
  with torrential rainfall impacting much of Berkeley and Dorchester 
  Counties and extending into parts of central and upper Charleston 
  County. As much a 2 to 5 inches of rain has fallen in this area 
  since late Thursday evening on top of the 9 to 17 inches of rain 
  that has fallen over the past several days. Widespread dangerous 
  flash flooding is ongoing across the city of Moncks Corner. High 
  water rescues are in progress and a life threatening situation is 
  developing. Take action now. Renewed flash flood could develop 
  across other parts of Dorchester County as well as central and 
  upper Charleston County.

  FLASH FLOOD EMERGENCY for Moncks Corner. This is a PARTICULARLY 
  DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar indicated.

  IMPACT...This is a PARTICULARLY DANGEROUS SITUATION. SEEK
           HIGHER GROUND NOW! Life threatening flash flooding of
           low water crossings, small creeks and streams, urban
           areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  North Charleston, Summerville, Goose Creek, Hanahan, Moncks 
  Corner, Saint George, Naval Weapons Station Charleston, Ladson, 
  Givhans Ferry State Park and Dorchester.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now! This is an extremely dangerous and 
life-threatening situation. Do not attempt to travel unless you are 
fleeing an area subject to flooding or under an evacuation order.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3338 7978 3332 7974 3327 7956 3326 7956
      3324 7949 3324 7946 3322 7946 3319 7941
      3296 7965 3293 7983 3295 8031 3302 8040
      3303 8039 3305 8040 3305 8043 3318 8059
      3340 7985 3337 7981

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CATASTROPHIC

$$

ST
7 follow-up statements
543 
WGUS72 KCHS 090636
FFSCHS

Flash Flood Statement
National Weather Service Charleston SC
236 AM EDT Fri Aug 9 2024

SCC015-019-035-090930-
/O.CON.KCHS.FF.W.0015.000000T0000Z-240809T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berkeley SC-Charleston SC-Dorchester SC-
236 AM EDT Fri Aug 9 2024

...FLASH FLOOD EMERGENCY FOR MONCKS CORNER...

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 AM EDT EARLY THIS 
MORNING FOR BERKELEY, CHARLESTON AND DORCHESTER COUNTIES...

At 236 AM EDT, Doppler radar showers and thunderstorms producing 
torrential rains across much of Dorchester, Berkeley and Charleston 
Counties. An intense area of rain will move into Moncks Corner by 2 
AM, resulting in continued life-threatening flash flooding where 
swift water rescues are in progress based on reports from Berkeley 
County emergency officials. Dorchester County emergency officials 
report numerous roads are closed due to flash flooding in and around 
Harleyville and Ridgeville, including Highway 78 near William Canady 
Road. As much a 3 to 7 inches of rain has fallen in this area since 
late Thursday evening on top of the 9 to 17 inches of rain that has 
fallen over the past few days. Any additional heavy rain will lead 
to more dangerous flash flooding.

  FLASH FLOOD EMERGENCY for Moncks Corner. This is a PARTICULARLY 
  DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar indicated.

IMPACT...This is a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER
         GROUND NOW! Life threatening flash flooding of low water
         crossings, small creeks and streams, urban areas,
         highways, streets and underpasses.

Some locations that will experience flash flooding include...
  North Charleston, Summerville, Goose Creek, Hanahan, Moncks 
  Corner, Saint George, Naval Weapons Station Charleston, Ladson, 
  Givhans Ferry State Park and Dorchester.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now! This is an extremely dangerous and 
life-threatening situation. Do not attempt to travel unless you are 
fleeing an area subject to flooding or under an evacuation order.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3338 7978 3332 7974 3327 7956 3326 7956
      3324 7949 3324 7946 3322 7946 3319 7941
      3296 7965 3293 7983 3295 8031 3302 8040
      3303 8039 3305 8040 3305 8043 3318 8059
      3340 7985 3337 7981

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CATASTROPHIC

$$

ST
298 
WGUS72 KCHS 090727
FFSCHS

Flash Flood Statement
National Weather Service Charleston SC
327 AM EDT Fri Aug 9 2024

SCC015-019-035-090930-
/O.CON.KCHS.FF.W.0015.000000T0000Z-240809T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berkeley SC-Charleston SC-Dorchester SC-
327 AM EDT Fri Aug 9 2024

...FLASH FLOOD EMERGENCY FOR MONCKS CORNER...

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 AM EDT EARLY THIS 
MORNING FOR BERKELEY, CHARLESTON AND DORCHESTER COUNTIES...

At 327 AM EDT, Doppler radar showers and thunderstorms producing 
torrential rains across much of Dorchester, Berkeley and Charleston 
Counties. An intense area of rain over northern portions of 
Dorchester and Colleton Counties will move into Moncks Corner over 
the next hour, resulting in continued life-threatening flash 
flooding.

Berkeley County emergency officials have reported that swift water 
rescues are in progress and many homes are flooded throughout the 
city of Moncks Corner. City streets are completely flooded with as 
much as 2 to 3 feet of fast moving water occuring. AVOID TRAVEL! 
Heed all evacuation and shelter in place orders.

Dorchester County emergency officials report numerous roads are 
closed due to flash flooding in and around Harleyville and 
Ridgeville, including Highway 78 near William Canady Road.

As much a 3 to 7 inches of rain has fallen in this area since late 
Thursday evening on top of the 9 to 17 inches of rain that has 
fallen over the past few days. Any additional heavy rain will lead 
to more dangerous flash flooding.

  FLASH FLOOD EMERGENCY for Moncks Corner. This is a PARTICULARLY 
  DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar indicated.

IMPACT...This is a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER
         GROUND NOW! Life threatening flash flooding of low water
         crossings, small creeks and streams, urban areas,
         highways, streets and underpasses.

Some locations that will experience flash flooding include...
  North Charleston, Summerville, Goose Creek, Hanahan, Moncks 
  Corner, Saint George, Naval Weapons Station Charleston, Ladson, 
  Givhans Ferry State Park and Dorchester.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now! This is an extremely dangerous and 
life-threatening situation. Do not attempt to travel unless you are 
fleeing an area subject to flooding or under an evacuation order.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3338 7978 3332 7974 3327 7956 3326 7956
      3324 7949 3324 7946 3322 7946 3319 7941
      3296 7965 3293 7983 3295 8031 3302 8040
      3303 8039 3305 8040 3305 8043 3318 8059
      3340 7985 3337 7981

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CATASTROPHIC

$$

ST
344 
WGUS72 KCHS 090913
FFSCHS

Flash Flood Statement
National Weather Service Charleston SC
513 AM EDT Fri Aug 9 2024

SCC015-019-035-090930-
/O.CON.KCHS.FF.W.0015.000000T0000Z-240809T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berkeley SC-Charleston SC-Dorchester SC-
513 AM EDT Fri Aug 9 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 AM EDT EARLY THIS 
MORNING FOR BERKELEY, CHARLESTON AND DORCHESTER COUNTIES...

At 513 AM EDT, Doppler radar indicated the heaviest rainfall has 
shifted south and east of Moncks Corner. 4 to 9 inches of rain has 
already fallen in portions of the warning area and emergency 
management has reported widespread flash flooding in Moncks Corner 
including water rescues. Additional rainfall amounts of 1 to 2 
inches are possible, mainly across southeast Berkeley and eastern 
Charleston County.

HAZARD...Life threatening flash flooding.

SOURCE...Emergency management reported.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, and highways.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3325 7999 3331 8000 3336 7998 3340 7985
      3337 7981 3338 7978 3332 7974 3324 7947
      3319 7941 3296 7965 3293 7983 3295 8031
      3302 8040 3303 8039 3305 8040 3305 8043
      3318 8059 3331 8015 3322 8007

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

JRL
060 
WGUS72 KCHS 090921
FFSCHS

Flash Flood Statement
National Weather Service Charleston SC
521 AM EDT Fri Aug 9 2024

SCC019-090931-
/O.CAN.KCHS.FF.W.0015.000000T0000Z-240809T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Charleston SC-
521 AM EDT Fri Aug 9 2024

...FLASH FLOOD WARNING IS CANCELLED FOR CHARLESTON COUNTY...

An Areal Flood Warning remains in effect for this area. Do not drive 
into flooded areas.

&&

LAT...LON 3325 7999 3336 7998 3340 7985 3332 7974
      3321 7945 3320 7948 3315 7952 3316 7956
      3312 7964 3298 7978 3294 7977 3293 7983
      3294 8003 3300 8005 3302 8015 3298 8023
      3298 8030 3318 8059 3331 8015 3322 8007

$$

SCC015-035-090930-
/O.CON.KCHS.FF.W.0015.000000T0000Z-240809T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berkeley SC-Dorchester SC-
521 AM EDT Fri Aug 9 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 AM EDT EARLY THIS 
MORNING FOR BERKELEY AND DORCHESTER COUNTIES...

At 521 AM EDT, Doppler radar indicated the heaviest rainfall has 
shifted south and east of Moncks Corner. 4 to 9 inches of rain has 
already fallen in portions of the warning area and emergency 
management has reported widespread flash flooding in Moncks Corner 
including water rescues. Additional rainfall amounts of 1 to 2 
inches are possible, mainly across southeast Berkeley County.

HAZARD...Life threatening flash flooding.

SOURCE...Emergency management reported.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, and highways.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3325 7999 3336 7998 3340 7985 3332 7974
      3321 7945 3320 7948 3315 7952 3316 7956
      3312 7964 3298 7978 3294 7977 3293 7983
      3294 8003 3300 8005 3302 8015 3298 8023
      3298 8030 3318 8059 3331 8015 3322 8007

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

JRL
182 
WGUS52 KCHS 090925
FFWCHS
SCC015-035-091300-
/O.EXT.KCHS.FF.W.0015.000000T0000Z-240809T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Charleston SC
525 AM EDT Fri Aug 9 2024

The National Weather Service in Charleston has extended the

* Flash Flood Warning for...
  Berkeley County in southeastern South Carolina...
  Dorchester County in southeastern South Carolina...

* Until 900 AM EDT.

* At 525 AM EDT, Doppler radar indicated the heaviest rainfall has 
  shifted south and east of Moncks Corner. 4 to 9 inches of rain has 
  already fallen in portions of the warning area and emergency 
  management has reported widespread flash flooding in Moncks Corner 
  including water rescues. Life-threatening flash flooding will 
  likely continue even after the heavy rainfall subsides. Additional 
  rainfall amounts of 1 to 2 inches are possible, mainly across 
  southeast Berkeley County.

  HAZARD...Life threatening flash flooding.

  SOURCE...Emergency management reported.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, and highways.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3325 7999 3336 7998 3340 7985 3332 7974
      3321 7945 3320 7948 3315 7952 3316 7956
      3312 7964 3298 7978 3294 7977 3293 7983
      3294 8003 3300 8005 3302 8015 3298 8023
      3298 8030 3318 8059 3331 8015 3322 8007

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

JRL
130 
WGUS72 KCHS 091235
FFSCHS

Flash Flood Statement
National Weather Service Charleston SC
835 AM EDT Fri Aug 9 2024

SCC015-035-091300-
/O.CON.KCHS.FF.W.0015.000000T0000Z-240809T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berkeley SC-Dorchester SC-
835 AM EDT Fri Aug 9 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING 
FOR BERKELEY AND DORCHESTER COUNTIES...

At 835 AM EDT, Radar rainfall estimates and automated rain gauges 
indicated that an area of 4 to 9 inches of rain has fallen across 
portions of Berkeley and Dorchester Counties. Emergency management 
has reported widespread flooding in Moncks Corner, Bonneau, Jedburg, 
and Ridgeville areas. Several roads are impassible due to moving 
flood waters. Interstate 26 near mile marker 189 in the Ridgeville 
area was closed in both directions due to flooding.

HAZARD...Life threatening flash flooding.

SOURCE...Emergency management reported.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, and highways.

This includes I-26 between mile markers 179 and 202.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3325 7999 3336 7998 3340 7985 3332 7974
      3321 7945 3320 7948 3315 7952 3316 7956
      3312 7964 3298 7978 3294 7977 3293 7983
      3294 8003 3300 8005 3302 8015 3298 8023
      3298 8030 3318 8059 3331 8015 3322 8007

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

NED
431 
WGUS72 KCHS 091259
FFSCHS

Flash Flood Statement
National Weather Service Charleston SC
859 AM EDT Fri Aug 9 2024

SCC015-035-091309-
/O.EXP.KCHS.FF.W.0015.000000T0000Z-240809T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berkeley SC-Dorchester SC-
859 AM EDT Fri Aug 9 2024

...FLASH FLOOD WARNING WILL EXPIRE AT 9 AM EDT THIS MORNING FOR 
BERKELEY AND DORCHESTER COUNTIES...

The heavy rain ended between 5 to 6 AM this morning. However, an 
area of 4 to 9 inches of rain fell across northern portions of 
Dorchester and Berkeley Counties last night. Significant flooding is 
ongoing across the Moncks Corner, Bonneau, Jedburg, and Ridgeville 
areas.  Please continue to heed remaining road closures. A Flood 
Warning remains in effect for the area until 1245 PM.

A Flood Watch remains in effect until 600 PM EDT Friday for a 
portion of southeast South Carolina.

&&

LAT...LON 3325 7999 3336 7998 3340 7985 3332 7974
      3321 7945 3320 7948 3315 7952 3316 7956
      3312 7964 3298 7978 3294 7977 3293 7983
      3294 8003 3300 8005 3302 8015 3298 8023
      3298 8030 3318 8059 3331 8015 3322 8007

$$

NED

What forecasters said that day

The local office's own words before this flash flood warning went out, 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 this flash flood warning went out at Aug 9, 12:48 AM EDT, 41 minutes earlier.

Area forecast discussion, Aug 9, 12:48 AM EDT, 41 minutes before
Area Forecast Discussion
National Weather Service Charleston SC
1248 AM EDT Fri Aug 9 2024

.SYNOPSIS...
Debby will track northward away from the region tonight. A weak
front will then stall in the vicinity late week into early next
week.

&&

.NEAR TERM /UNTIL 6 AM THIS MORNING/...
Tropical Depression Debby will continue to pull north through
Virginia overnight, while a weak cold front is situated northeast-
southwest over inland sections of the Southeast. Since moisture
remains exceptionally high, and low level moisture transport is also
elevated, the potential for convection will remain for the night. A
spoke of vorticity circulating around the southern side of Debby
will swing through overnight, resulting in scattered to locally
widespread showers and a few t-storms, mainly across the Quad County
Area across Southeast South Carolina and stretching into western
most zones just south of the Savannah River into Southeast Georgia.
Some locally heavy rainfall is still a concern due to the high
moisture values and maybe even backbuilding storms. See the
Hydrology section for additional information.

A continued southerly flow and considerable cloud cover won't allow
temperatures to cool much more than a few degrees tonight, at least
outside convection. Locations that are directly impacted by
convection early, likely have reached their minimum tonight, and
could even warm a degree or two late. On average lows will be in the
low to mid 70s, although where it doesn't rain, lows will only
dip into the upper 70s

&&

.SHORT TERM /6 AM THIS MORNING THROUGH SUNDAY/...
Friday, in the wake of Debby, PW values across the forecast
area will remain two inches or greater. The region will remain
on the eastern edge of a H5 ridge centered over the Southern
Great Plains. Short term guidance indicates that a mid-level
disturbance may track across the forecast area Friday afternoon.
Also, higher resolution guidance indicates that a sea breeze
will develop in the afternoon and advance inland. Given
temperatures in the low to mid 90s and dewpoints in the mid to
upper 70s, CAPE values could exceed 3000 J/kg in some locations.
Showers and thunderstorms are forecast to develop along and
near the sea breeze Friday afternoon, with the greatest coverage
over the CHS Tri-county. HREF indicates the probs of 1"/3hr
increase above 50 percent with 3"/3 hr ranging from 10-30
percent along the sea breeze. See hydro section below for
additional details. Heat index values may peak around 108 Friday
afternoon, Heat Advisory is possible.

Saturday and Sunday: A wavy stationary front will remain across
the inland counties through this weekend. A sea breeze is
possible each afternoon and evening. Scattered to likely showers
and thunderstorms are possible each PM. Highs should generally
peak in the low 90s, which will combine with elevated dew points
to produce heat indices around 108 in spots, especially across
the eastern half of the forecast area. Heat Advisories could be
needed.

&&

.LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/...
A stationary front will linger across the forecast area into
mid week. Long term guidance indicates that a broad H5 trough
will remain across the region. This pattern should support
scattered showers and thunderstorms each afternoon and evening.
High temperatures should favor values in the low 90s.

&&

.AVIATION /06Z FRIDAY THROUGH TUESDAY/...
CHS/JZI: At least scattered SHRA and a few TSRA will move near or
through the terminals through the overnight. For now we have VCTS,
but any direct impact would cause brief flight restrictions. Thus,
our reasoning for showing a temporary group from 04-08Z of MVFR
conditions in moderate TSRA at CHS and SHRA at JZI. Late tonight
into Friday afternoon there doesn't appear to be any concerns, but
more convection will occur on the sea breeze thereafter. For now, we
show VCTS, but any direct impacts would produce gusty winds and
flight restrictions.

SAV: Odds favor most if not all convection that is upstream not
impacting the terminal. We have VCSH from 04-08Z though, just in
case some of it survives as per the Hi-Res guidance. A better chance
of convection looks to occur after 19Z Friday, when we show VCTS.
But gusty winds and flight restrictions are likely.

Extended Aviation Outlook: Flight restrictions are possible in
afternoon and evening showers/thunderstorms into early next week.

&&

.MARINE...
Overnight: Even though TD Debby will continue to pull further away
to the north, the cyclonic circulation around that system will
generally prevail. That along with a fairly tight gradient between
that system and the sub-tropical ridge to the south and east, will
result in south or south-southwest winds gusting as high as 20-30 kt
across some local waters, and around 20 kt at times in the
Charleston Harbor and nearshore Georgia waters. This in turn allows
for seas to build as high as 6 or 7 feet on the South Carolina
waters, and up to 6 feet on the outer Georgia waters, supporting
Small Craft Advisories. The nearshore Georgia waters are still
expected to stay just shy of advisory levels, although some
localized gusts of 25 kt will occur from time to time.

Friday through Tuesday: Conditions will gradually improve
through the day on Friday. Southwest winds will remain gusty
through the afternoon with six foot seas lingering into Friday
afternoon. By Friday evening, winds and seas should settle below
Small Craft Advisory criteria. A stationary front is forecast
to remain across the region this weekend into early next week,
supporting steady SW winds and seas around 2 to 3 ft.

Rip Currents: High Risk is forecast for SC beaches Friday, with
a Moderate risk across GA beaches. The combination of a
lingering south longshore current, swell, and changes to the
surf zone bathymetry may favor rip currents on Saturday.

&&

.HYDROLOGY...
Debby will continue to bring a threat for heavy rainfall through
the night, which will exacerbate ongoing flooding issues. A
Flood Watch remains in effect for portions of Southeast South
Carolina through the night as a result.

Significant rainfall has fallen across most of our area, with an
additional 1 to 2 inches still possible tonight, mainly across
parts of southeast South Carolina. Recent reports prior to
midnight have been for as much as 2-3 inches in parts of
Dorchester and Berkeley County, which is along a moisture
convergence axis. After midnight this activity will begin to
diminish in coverage and intensity. This situation is being
handled by an Areal Flood Warning.

Further south into Georgia, additional rainfall amounts will be
light and the threat for flash flooding is considerably less.

&&

.CHS WATCHES/WARNINGS/ADVISORIES...
GA...None.
SC...Flood Watch until 8 AM EDT this morning for SCZ043>045-049-050-
     052.
     High Risk for Rip Currents through this evening for SCZ048>051.
MARINE...Small Craft Advisory until 8 PM EDT this evening for AMZ350.
     Small Craft Advisory until 6 AM EDT early this morning for
     AMZ352.
     Small Craft Advisory until 9 AM EDT this morning for AMZ374.

&&

NEAR TERM...DPB
SHORT TERM...NED
LONG TERM...NED
AVIATION...
MARINE...DPB
Hazardous weather outlook, Aug 8, 9:57 PM EDT, 3 hours 32 minutes before
Hazardous Weather Outlook
National Weather Service Charleston SC
957 PM EDT Thu Aug 8 2024

GAZ087-088-099>101-114>116-118-137-138-140-SCZ040-042-047-100200-
Jenkins-Screven-Candler-Bulloch-Effingham-Tattnall-Evans-
Inland Bryan-Inland Chatham-Long-Inland Liberty-Inland McIntosh-
Allendale-Hampton-Inland Jasper-
957 PM EDT Thu Aug 8 2024

This Hazardous Weather Outlook is for southeast Georgia and
southeast South Carolina.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Heat: Heat indices could approach or exceed 108 degrees Friday and
Saturday. Heat Advisories could be needed.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

GAZ117-119-139-141-100200-
Coastal Bryan-Coastal Chatham-Coastal Liberty-Coastal McIntosh-
957 PM EDT Thu Aug 8 2024

...MODERATE RISK FOR RIP CURRENTS IN EFFECT THROUGH FRIDAY EVENING...

This Hazardous Weather Outlook is for southeast Georgia.

.DAY ONE...Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Moderate Risk for Rip Currents.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Moderate Risk for Rip Currents.

Heat: Heat indices could approach or exceed 108 degrees Friday and
Saturday. Heat Advisories could be needed.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

SCZ048-051-100200-
Beaufort-Coastal Jasper-
957 PM EDT Thu Aug 8 2024

...HIGH RISK FOR RIP CURRENTS IN EFFECT THROUGH FRIDAY EVENING...

This Hazardous Weather Outlook is for southeast South Carolina.

.DAY ONE...Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   High Risk for Rip Currents.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   High Risk for Rip Currents.

Heat: Heat indices could approach or exceed 108 degrees Friday and
Saturday. Heat Advisories could be needed.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

SCZ049-050-100200-
Coastal Colleton-Charleston-
957 PM EDT Thu Aug 8 2024

...FLOOD WATCH IN EFFECT UNTIL 8 AM EDT FRIDAY...
...HIGH RISK FOR RIP CURRENTS IN EFFECT THROUGH FRIDAY EVENING...

This Hazardous Weather Outlook is for southeast South Carolina.

.DAY ONE...Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flood Watch.
   High Risk for Rip Currents.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flood Watch.
   High Risk for Rip Currents.

Heat: Heat indices could approach or exceed 108 degrees Friday and
Saturday. Heat Advisories could be needed.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

SCZ043>045-052-100200-
Inland Colleton-Dorchester-Inland Berkeley-Tidal Berkeley-
957 PM EDT Thu Aug 8 2024

...FLOOD WATCH IN EFFECT UNTIL 8 AM EDT FRIDAY...

This Hazardous Weather Outlook is for southeast South Carolina.

.DAY ONE...Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flood Watch.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flood Watch.

Heat: Heat indices could approach or exceed 108 degrees Friday and
Saturday. Heat Advisories could be needed.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

AMZ330-350-352-354-374-100200-
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-
957 PM EDT Thu Aug 8 2024

This Hazardous Weather Outlook is for Atlantic coastal waters.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

In the hours before

Local storm report, Aug 8, 9:21 PM EDT, 4 hours 8 minutes before
Preliminary Local Storm Report
National Weather Service Charleston SC
921 PM EDT Thu Aug 08 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0712 PM     Tstm Wnd Dmg     1 N Walterboro          32.93N  80.67W
08/08/2024                   Colleton           SC   Emergency Mngr

            Colleton County Emergency Management reported a tree
            down on Longleaf Drive near Jefferies Highway.

0723 PM     Tstm Wnd Dmg     3 NNW Cottageville      32.98N  80.49W
08/08/2024                   Colleton           SC   Emergency Mngr

            Colleton County Emergency Management reported a tree
            down and power lines down blocking one lane near the
            intersection of Wesley Grove Road and Rehoboth Road.

&&

Event Number CHS2401036
Event Number CHS2401037

BSH
Local storm report, Aug 8, 9:25 PM EDT, 4 hours 4 minutes before
Preliminary Local Storm Report
National Weather Service Charleston SC
925 PM EDT Thu Aug 08 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0237 PM     Flash Flood      3 SE Islandton          32.87N  80.89W
08/08/2024                   Colleton           SC   Emergency Mngr

            Colleton County Emergency Management reported that the
            drainage pipe under the roadway in the 1300 block of
            Forks Road has washed out due to heavy rainfall from
            Debby. The exact date and time of the event is unknown.

&&

Event Number CHS2401038

BSH
Local storm report, Aug 8, 10:46 PM EDT, 2 hours 43 minutes before
Preliminary Local Storm Report
National Weather Service Charleston SC
1046 PM EDT Thu Aug 08 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1030 PM     Flood            5 SW Jamestown          33.24N  79.75W
08/08/2024                   Berkeley           SC   Emergency Mngr

            Berkeley County Emergency Management reported water
            across the roadway on Highway 41 in the area between
            Jackie Road and Bethera Road.

1030 PM     Flood            Huger                   33.09N  79.80W
08/08/2024                   Berkeley           SC   Emergency Mngr

            Berkeley County Emergency Management reported water
            coming across the roadway on Highway 41 in area between
            the intersections with United Drive and Cainhoy Road.

&&

Event Number CHS2401039
Event Number CHS2401040

BSH
Local storm report, Aug 8, 10:57 PM EDT, 2 hours 32 minutes before
Preliminary Local Storm Report
National Weather Service Charleston SC
1057 PM EDT Thu Aug 08 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1040 PM     Flood            Smoaks                  33.10N  80.81W
08/08/2024                   Colleton           SC   Emergency Mngr

            Colleton County Emergency Management reported water in
            the roadway in the 28200 block of Lowcountry Highway.

&&

Event Number CHS2401041

BSH
Local storm report, Aug 8, 11:07 PM EDT, 2 hours 22 minutes before
Preliminary Local Storm Report
National Weather Service Charleston SC
1107 PM EDT Thu Aug 08 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1045 PM     Tstm Wnd Dmg     5 NNW Round O           33.00N  80.57W
08/08/2024                   Colleton           SC   Emergency Mngr

            Colleton County Emergency Management reported a tree
            down near the intersection of Round O Road and Sidneys
            Road. The tree was blocking both lanes of the roadway.

&&

Event Number CHS2401042

BSH
Local storm report, Aug 8, 11:56 PM EDT, 1 hour 33 minutes before
Preliminary Local Storm Report
National Weather Service Charleston SC
1156 PM EDT Thu Aug 08 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1150 PM     Flood            Moncks Corner           33.20N  80.01W
08/08/2024                   Berkeley           SC   Emergency Mngr

            Berkeley County Emergency Management reported parts of
            the city were flooded. Shannonwood Drive and South Live
            Oak at Black Tom were flood and closed. Other roads in
            the city are not passable.

&&

Event Number CHS2401043

The office that day

Everything else NWS Charleston, SC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 9, 12:24 PM EDTAreal Flood WarningCHSJasper24 hr
Aug 9, 4:41 PM EDTSpecial Weather StatementCHSBerkeley49 min
Aug 9, 5:26 PM EDTSpecial Weather StatementCHSBerkeley34 min
Aug 9, 6:06 PM EDTSpecial Weather StatementCHSBerkeley39 min
Aug 9, 6:25 PM EDTFlash Flood Warning Considerable damage threatCHSBerkeley2 hr

Nearby

Flash Flood Warnings in South Carolina, 2024Every flash flood warning in 2024

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.