Flash Flood Warning 46, NWS Columbia, SC

840 
WGUS72 KCAE 271040
FFSCAE

Flash Flood Statement
National Weather Service Columbia SC
640 AM EDT Fri Sep 27 2024

GAC181-SCC003-037-065-081-271300-
/O.CON.KCAE.FF.W.0046.000000T0000Z-240927T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lincoln GA-Aiken SC-Edgefield SC-McCormick SC-Saluda SC-
640 AM EDT Fri Sep 27 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING 
FOR LINCOLN, NORTHWESTERN AIKEN, EDGEFIELD, MCCORMICK AND 
SOUTHWESTERN SALUDA COUNTIES...

At 640 AM EDT, Doppler radar and automated rain gauges indicated 
that heavy rain was falling across the warned area. Between 4 and 7 
inches of rain have fallen. Additional rainfall amounts up to 0.5 
inches are possible in the warned area. Flash flooding is ongoing or 
expected to begin shortly.

HAZARD...Flash flooding caused by heavy rain. THe heaviest
         rainfall should be pushing out of the area, with
         flooding expected to continue.

SOURCE...Radar and automated gauges.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  North Augusta, Belvedere, Edgefield, Saluda, McCormick, Johnston, 
  Lincolnton, Ridge Spring, Hamilton Branch State Park, Clarks Hill 
  Recreation Area, Mccormick County Airport, J. Strom Thurmond Dam, 
  Elijah Clark State Park, Edgefield County Airport, Saluda County 
  Airport, Trenton, Parksville, Ward, Plum Branch and Cleora.

This includes the following highways...
	Interstate 520 in South Carolina near mile marker 23.
	Interstate 20 in South Carolina between mile markers 0 and 19.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Most flooding deaths occur in vehicles. Never drive through a 
flooded roadway or around barricades. Turn around, don't drown.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3401 8259 3408 8248 3406 8233 3397 8231
      3402 8224 3397 8217 3398 8205 3397 8205
      3395 8205 3406 8193 3405 8182 3391 8164
      3380 8163 3359 8175 3353 8201 3362 8218
      3369 8224 3364 8248 3398 8265 3396 8257

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

PL

Area Forecast Discussion
National Weather Service Columbia SC
212 AM EDT Fri Sep 27 2024

.SYNOPSIS...
Hurricane Helene has moved onshore and is currently moving into
south central GA. Widespread rain, flash flooding, very strong
and gusty winds along with isolated tornadoes remain possible
through late this morning. Confidence in impacts remains high
with tropical storm force winds as the primary threat. The
storm is expected to move west and north of the area Friday with
diminishing winds. Dry weather is expected Saturday into early
next week along with seasonal to slightly above normal
temperatures.

&&

.NEAR TERM /THROUGH TODAY/...
Key Messages:
- Hurricane Helene marching northward overnight and passing west
  of the area early this morning
- Tropical Storm Warning in effect for the entire CWA. Potential
  for gusty winds of 50-60 mph, especially in the CSRA.
- Tornado threat continues with a Tornado Watch in effect until
  8 AM Friday morning.
- Flood Watch in effect through Friday afternoon for the CSRA
  and southwestern Midlands.
- Areas of heavy rainfall could
  result in flash flooding, especially south and west of I-26.

Overnight through Friday Morning:

Hurricane Helene has moved onshore and continues marching
rapidly northward into south central GA. CAE WSR-88D returns
show widespread rain across the area with regional network
showing rain blanketing the region. Hazards through this morning
continue to focus on the very strong and gusty winds isolated
tornadoes, heavy rainfall, and localized flooding.

Wind: A Tropical Storm Warning remains in effect for the entire
CWA. Hurricane Helene has an unusually large wind field for a
tropical cyclone in the lower latitudes and will be
transitioning to an extra-tropical cyclone after landfall
resulting in a tricky wind forecast for the Midlands and CSRA.
What we can say with higher confidence is that the strongest
winds are likely across the CSRA and Southwestern Midlands which
will be closer to the cyclone center. Wind gusts up to 60 mph
are possible through this morning. There will be a potential
for the stronger winds to cause localized wind damage including
isolated to scattered power outages.

Tornadoes: With Helene forecast to pass to our west, this places the
FA in the right-front quadrant of the cyclone which is a favorable
location for tropical tornadoes. The combination of strong 0-6
km wind shear and increasing helicity will support tornado
development in any thunderstorms that develop. It is important
to note that many, but not all, tropical tornadoes develop
quickly and are short lived resulting in limited lead time. This
threat is compounded by the timing of greatest risk which is
during the overnight hours.

Heavy Rainfall and Flash Flooding: Rainfall chances basically
categorical or close to if not 100 percent overnight into this
morning. A Flood Watch is in effect through Friday afternoon for
portions of the forecast area. Rainfall thus far from Helene
shows numerous locations already in excess of 4 inches with
additional rain likely to result flooding issues.

Friday late morning through Friday afternoon:
The remains of Helene will rapidly track off to the northwest of
the area, towards central TN and KY through the day. Rainfall
will be ending towards noon time, and conditions will improve
through the afternoon. Afternoon highs will moderate somewhat
with the return of some sunshine ranging from around 80 in the
west to the mid 80s in the east.

&&

.SHORT TERM /TONIGHT THROUGH SUNDAY NIGHT/...
Key messages:
- A closed upper low over the Ohio River Valley this weekend
  with a chance of showers mainly north of I-20.
- River Flooding expected to be occurring.

A closed upper level low pressure system over the Ohio River Valley
absorbs TC Helene Friday Night and then crawls eastward toward the
Mid Atlantic States this weekend. The best chance for showers
appears to be on Sunday with the upper low directly to the north of
the Carolinas. Temperatures are expected to be slightly above normal
for the end of September.

The excessive amount of rainfall which will continue to fall in
Upstate SC during the passage of TC Helene is expected to increase
river flows to minor to moderate flood stage this weekend.

&&

.LONG TERM /MONDAY THROUGH THURSDAY/...
Key Messages:
- Drier and continued warm conditions expected next week.

A pesky closed upper level low pressure system moves offshore and
begins to open up on Monday and is gradually replaced by above normal
H5 heights. This should result in dry weather and temperatures
3 to 5 degrees above climatology for early October. Some river
levels should drop below flood stage by mid week.

&&

.AVIATION /06Z FRIDAY THROUGH TUESDAY/...
Restrictions to dominate the first half of the period with
conditions improving from mid morning through the end of the
period.

Hurricane Helene will be marching northward through the day and
pass west of the terminals. Numerous concerns through the period
with very strong and gusty winds topping the list. Sustained
speeds increasing to 35-40 kts and gusts of 50-60 kts at times,
particularly at AGS/DNL. Exceptionally strong winds will also be
present aloft. Rain will also continue and become heavy at times
with vsbys generally between 3 and 5 miles and cigs between 800
and 1500 feet. Conditions will begin improving during the late
morning hours as Helene passes to the west with winds slowly
subsiding through the day and clouds diminishing. Expect VFR
conditions from midday through the end of the period however
winds will remain a concern.

EXTENDED AVIATION OUTLOOK...No significant impacts to aviation
expected through Tuesday.

&&

.CAE WATCHES/WARNINGS/ADVISORIES...
SC...Flood Watch through this afternoon for SCZ016-018-020>022-
     025>028-030-035-037-041-115-116-135-136.
     Tropical Storm Warning for SCZ016-018-020>022-025>031-035-037-
     038-041-115-116-135>137.
GA...Flood Watch through this afternoon for GAZ040-063>065-077.
     Tropical Storm Warning for GAZ040-063>065-077.
&&

Preliminary Local Storm Report
National Weather Service Columbia SC
416 AM EDT Fri Sep 27 2024

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

0410 AM     Tropical Cyclone 2 W Augusta Daniel Fiel 33.47N 82.07W
09/27/2024                   Richmond           GA   Public

            Public reported trees down and power flashes
            along Sibley Rd in Augusta.

&&

gpl

Preliminary Local Storm Report
National Weather Service Columbia SC
430 AM EDT Fri Sep 27 2024

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

0425 AM     Tropical Cyclone 3 ENE Bowman            33.37N 80.64W
09/27/2024                   Orangeburg         SC   Emergency Mngr

            Orangeburg County EM reports trees down
            along Baxley Rd.

&&

gpl

Preliminary Local Storm Report
National Weather Service Columbia SC
445 AM EDT Fri Sep 27 2024

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

0444 AM     Tropical Cyclone 5 WSW Rowesville        33.35N 80.92W
09/27/2024                   Orangeburg         SC   Emergency Mngr

            Trees down.

&&

RJO

Preliminary Local Storm Report
National Weather Service Columbia SC
447 AM EDT Fri Sep 27 2024

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

0441 AM     Tropical Cyclone 1 NE Bowman             33.36N 80.67W
09/27/2024                   Orangeburg         SC   Emergency Mngr

            Trees down.

&&

RJO

Preliminary Local Storm Report
National Weather Service Columbia SC
449 AM EDT Fri Sep 27 2024

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

0441 AM     Tropical Cyclone 3 ESE Cope              33.36N 80.95W
09/27/2024                   Orangeburg         SC   Public

            Trees down.

&&

RJO

Preliminary Local Storm Report
National Weather Service Columbia SC
507 AM EDT Fri Sep 27 2024

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

0503 AM     Tropical Cyclone Augusta Bush Field      33.37N 81.97W
09/27/2024                   Richmond           GA   Public

            74 mph wind gust.

&&

RJO