Alert archive / South Carolina / Areal Flood Advisories in 2021

Areal Flood Advisory 66, NWS Columbia, SC

August 17, 2021Calhoun County, Lexington County, Richland County, South Carolina

NWS Columbia, SC issued this areal flood advisory at Aug 17, 2021, 10:58 PM EDT for Calhoun County, Lexington County, Richland County, South Carolina. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: Aug 17, 2021, 10:58 PM EDT (02:58 UTC)
Expired: Aug 18, 2021, 1:00 AM EDT
In force: 2 hr
Issued by: NWS Columbia, SC
Area: Storm-based polygon

Counties Calhoun County, SC, Lexington County, SC, Richland County, SC

The radar

The Columbia radar (KCAE), 15 km from the middle of the area, began a volume at 02:59 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.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 3.0 hours before the alert went out and 141 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1990 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 710 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory went out, 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 this areal flood advisory went out at Aug 17, 10:41 PM EDT, 17 minutes earlier.

Area forecast discussion, Aug 17, 10:41 PM EDT, 17 minutes before

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Hazardous weather outlook, Aug 17, 6:31 PM EDT, 4 hours 27 minutes before

Hazardous Weather Outlook
National Weather Service Columbia SC
631 PM EDT Tue Aug 17 2021

GAZ040-063>065-077-SCZ016-018-025-029>031-035-038-041-135>137-182245-
Lincoln-McDuffie-Columbia-Richmond-Burke-Chesterfield-McCormick-
Edgefield-Lee-Aiken-Sumter-Barnwell-Clarendon-Bamberg-
Northwestern Orangeburg-Central Orangeburg-Southeastern Orangeburg-
631 PM EDT Tue Aug 17 2021

This Hazardous Weather Outlook is for the Midlands of South Carolina
and the Central Savannah River area of Georgia.

.DAY ONE...Tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

SCZ020>022-026>028-037-115-116-182245-
Newberry-Fairfield-Kershaw-Saluda-Lexington-Richland-Calhoun-
Northern Lancaster-Southern Lancaster-
631 PM EDT Tue Aug 17 2021

...TORNADO WATCH 446 IN EFFECT UNTIL 2 AM EDT WEDNESDAY...

This Hazardous Weather Outlook is for the Midlands of South Carolina
and the Central Savannah River area of 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.

   Tornado Watch.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Aug 17, 7:43 PM EDT, 3 hours 15 minutes before

Special Weather Statement
National Weather Service Columbia SC
743 PM EDT Tue Aug 17 2021

GAZ065-077-SCZ030-035-180015-
Burke GA-Richmond GA-Barnwell SC-Aiken SC-
743 PM EDT Tue Aug 17 2021

...Strong thunderstorms will impact portions of central Burke,
southeastern Richmond, eastern Edgefield, southwestern Barnwell and
Aiken Counties through 815 PM EDT...

At 743 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Edgefield County Airport to 6 miles
northeast of Augusta Regional Airport to near Burke County Airport.
Movement was northeast at 50 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Aiken, Waynesboro, Savannah River Site, Aiken Mall, Plant Vogtle, New
Ellenton, Jackson, Alexander, Burke County Airport, USC Aiken,
Citizens Park, Aiken Municipal Airport, Gloverville, Aiken State
Park, Graniteville, Burnettown, Windsor, Savannah River Site Badge
Office, Vaucluse and New Holland.

This includes Interstate 20 in South Carolina between mile markers 12
and 34.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3293 8218 3336 8190 3368 8183 3381 8166
      3382 8154 3364 8138 3301 8175
TIME...MOT...LOC 2343Z 219DEG 44KT 3378 8178 3341 8186 3304 8210

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

fwa

Special weather statement, Aug 17, 8:18 PM EDT, 2 hours 40 minutes before

Special Weather Statement
National Weather Service Columbia SC
818 PM EDT Tue Aug 17 2021

SCZ020-025-026-028-180100-
Newberry SC-Richland SC-Saluda SC-Edgefield SC-
818 PM EDT Tue Aug 17 2021

...A strong thunderstorm will impact portions of southeastern
Newberry, eastern Edgefield, northwestern Lexington, eastern Saluda
and northwestern Richland Counties through 900 PM EDT...

At 817 PM EDT, Doppler radar was tracking a strong thunderstorm near
Ridge Spring, or 8 miles west of Batesburg-Leesville, moving
northeast at 35 mph.

HAZARD...Winds in excess of 30 mph. Brief funnel clouds are also
         possible.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

This storm will remain over mainly rural areas of southeastern
Newberry, eastern Edgefield, northwestern Lexington, eastern Saluda
and northwestern Richland Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Tornado Watch remains in effect until 200 AM EDT for central South
Carolina.

&&

LAT...LON 3428 8157 3414 8129 3413 8130 3416 8133
      3417 8137 3417 8141 3412 8143 3407 8139
      3407 8141 3408 8143 3408 8145 3409 8147
      3388 8157 3381 8166 3389 8181
TIME...MOT...LOC 0017Z 212DEG 32KT 3391 8167

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

fwa

Local storm report, Aug 17, 8:22 PM EDT, 2 hours 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
822 PM EDT TUE AUG 17 2021

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

0533 PM     TSTM WND DMG     6 NNW BROOKDALE         33.60N 80.87W
08/17/2021                   ORANGEBURG         SC   EMERGENCY MNGR

            PUBLIC REPORTED A FUNNEL CLOUD DROPPED DOWN
            NEAR CHURCH ALONG NEW HOPE AND COLUMBIA RD.
            EM FOUND 100 YD OF TREES FALLEN IN MULTIPLE
            DIRECTIONS. POSSIBLY TORNADO DAMAGE. TIME
            ESTIMATED FROM RADAR.

&&

NS

Special weather statement, Aug 17, 8:22 PM EDT, 2 hours 36 minutes before

Special Weather Statement
National Weather Service Columbia SC
822 PM EDT Tue Aug 17 2021

GAZ065-077-SCZ030-035-180115-
Burke GA-Richmond GA-Barnwell SC-Aiken SC-
822 PM EDT Tue Aug 17 2021

...Strong thunderstorms will impact portions of eastern Burke,
eastern Richmond, eastern Edgefield, western Barnwell, southwestern
Lexington, Aiken and southeastern Saluda Counties through 915 PM
EDT...

At 820 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Ridge Spring to near Aiken Mall to near
Burke County Airport. Movement was northeast at 10 mph.

HAZARD...Wind gusts up to 40 mph possible.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Aiken, Savannah River Site, Aiken Mall, Plant Vogtle, Williston, New
Ellenton, Jackson, Sardis, Alexander, USC Aiken, Citizens Park, Aiken
Municipal Airport, Aiken State Park, Gloverville, Wagener, Snelling,
Monetta, Girard, Windsor and Savannah River Site Badge Office.

This includes Interstate 20 in South Carolina between mile markers 16
and 36.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3295 8186 3292 8203 3344 8181 3374 8175
      3388 8157 3381 8151 3377 8143 3373 8141
      3371 8133 3351 8137 3315 8149 3316 8154
      3310 8162 3304 8154 3291 8176
TIME...MOT...LOC 0020Z 234DEG 9KT 3388 8167 3348 8175 3307 8194

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

CJR

Special weather statement, Aug 17, 9:18 PM EDT, 1 hour 40 minutes before

Special Weather Statement
National Weather Service Columbia SC
918 PM EDT Tue Aug 17 2021

SCZ020-021-027-028-180200-
Fairfield SC-Lexington SC-Newberry SC-Richland SC-
918 PM EDT Tue Aug 17 2021

...Strong thunderstorms will impact portions of western Fairfield,
eastern Newberry, Lexington, and northwestern Richland Counties
through 1000 PM EDT...

At 916 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from Carlisle to 8 miles southeast of
Batesburg-Leesville. Movement was northeast at 20 mph.

HAZARD...Winds in excess of 30 mph and funnel clouds.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Columbia, Lexington, Cayce, Irmo, Batesburg-Leesville, Springdale, VC
Summer Nuclear Station, Oak Grove, Highway 6 at Lake Murray Dam, Red
Bank, St. Andrews, South Congaree, Pine Ridge, Gaston, Jenkinsville,
Harbison State Forest, Monticello, Dreher Island State Park,
Blackstock and Columbia Metro Airport.

This includes the following highways...
 Interstate 20 in South Carolina between mile markers 37 and 63.
 Interstate 26 between mile markers 79 and 106.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 200 AM EDT for central South
Carolina.

&&

LAT...LON 3456 8113 3381 8111 3373 8141 3377 8143
      3381 8150 3401 8150 3407 8147 3407 8150
      3447 8151 3449 8149 3450 8142 3457 8142
TIME...MOT...LOC 0116Z 241DEG 19KT 3458 8144 3382 8143

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

fwa

Local storm report, Aug 17, 9:27 PM EDT, 1 hour 31 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 8:18 PM EDT	Special Weather Statement	CAE	Saluda	42 min
Aug 17, 8:22 PM EDT	Special Weather Statement	CAE	Aiken	53 min
Aug 17, 8:40 PM EDT	Severe Thunderstorm Warning	CAE	Aiken	50 min
Aug 17, 8:43 PM EDT	Tornado Warning	CAE	Lexington, Saluda	32 min
Aug 17, 9:18 PM EDT	Special Weather Statement	CAE	Fairfield, Lexington	42 min
Aug 17, 11:45 PM EDT	Flash Flood Warning	CAE	Lexington, Richland	2 hr

Nearby

Areal Flood Advisories in South Carolina, 2021 Every areal flood advisory in 2021

Sources

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