Alert archive / Georgia / Special Weather Statements in 2020

Special Weather Statement, NWS Charleston, SC

August 18, 2020Screven County, Georgia

NWS Charleston, SC issued this special weather statement at Aug 18, 2020, 1:48 PM EDT for Screven County, Georgia. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 18, 2020, 1:48 PM EDT (17:48 UTC)
Expired
Aug 18, 2020, 2:30 PM EDT
In force
42 min
Issued by
NWS Charleston, SC

County Screven County, GA

The radar

The Charleston,SC radar (KCLX), 46 km from the middle of the area, began a volume at 17:50 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 12:00Z, 5.8 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-pSkew-T log-p diagram, Charleston AFB, SC at 12:00Z on 2020-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 828 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 12:00Z on 2020-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -19 square meters per square second.1939Sfc1 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
828 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
856 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
-19 m²/s²
0-3 km storm-relative helicity
-30 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 18, 10:31 AM EDT, 3 hours 17 minutes earlier.

Area forecast discussion, Aug 18, 10:31 AM EDT, 3 hours 17 minutes before
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Hazardous weather outlook, Aug 18, 4:16 AM EDT, 9 hours 32 minutes before
Hazardous Weather Outlook
National Weather Service Charleston SC
416 AM EDT Tue Aug 18 2020

SCZ048>050-190830-
Beaufort-Coastal Colleton-Charleston-
416 AM EDT Tue Aug 18 2020

...MODERATE RISK FOR RIP CURRENTS IN EFFECT FROM 8 AM EDT THIS
MORNING THROUGH THIS EVENING...

This Hazardous Weather Outlook is for southeast South Carolina.

.DAY ONE...Today and 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.

Coastal Flooding: Minor coastal flooding is likely with the high
tide this evening. A Coastal Flood Advisory will be issued later
today.

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

Coastal Flooding: Minor coastal flooding is likely with the evening
high tides through at least Thursday. Coastal Flood Advisories could
be needed.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

GAZ117-119-139-141-SCZ051-190830-
Coastal Bryan-Coastal Chatham-Coastal Liberty-Coastal McIntosh-
Coastal Jasper-
416 AM EDT Tue Aug 18 2020

...MODERATE RISK FOR RIP CURRENTS IN EFFECT FROM 8 AM EDT THIS
MORNING THROUGH THIS EVENING...

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

.DAY ONE...Today and 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...Wednesday through Monday.

Coastal Flooding: Minor coastal flooding is likely with the evening
high tides through at least Thursday. Coastal Flood Advisories could
be needed.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

AMZ330-350-352-354-374-GAZ087-088-099>101-114>116-118-137-138-140-
SCZ040-042>045-047-052-190830-
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-
Jenkins-Screven-Candler-Bulloch-Effingham-Tattnall-Evans-
Inland Bryan-Inland Chatham-Long-Inland Liberty-Inland McIntosh-
Allendale-Hampton-Inland Colleton-Dorchester-Inland Berkeley-
Inland Jasper-Tidal Berkeley-
416 AM EDT Tue Aug 18 2020

This Hazardous Weather Outlook is for Atlantic coastal waters,
southeast Georgia and southeast South Carolina.

.DAY ONE...Today and 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 assistance is not anticipated at this time.

In the hours before

Special weather statement, Aug 18, 1:48 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Charleston SC
148 PM EDT Tue Aug 18 2020

GAZ088-181830-
Screven-
148 PM EDT Tue Aug 18 2020

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF SCREVEN COUNTY...

At 147 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorm near Altman, or near Sylvania, moving east at 15
mph.

  HAZARD...strong winds 45 to 55 mph.

  IMPACT...Expect minor damage to tree limbs and blowing around of
           light, unsecured objects.

Some locations in the path of this storm include...
Sylvania, Hiltonia, Newington, Rocky Ford, Woodcliff, Altman,
Hilltonia and Captolo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify. Be certain to monitor local radio and TV
stations as well as local cable TV outlets for additional information
and possible warnings from the National Weather Service.

Report damage directly to the Charleston National Weather Service at
1-888-383-2024 when it is safe to do so. You can also email your
report to nws.charlestonsc@noaa.gov.

&&

LAT...LON 3291 8177 3304 8154 3301 8149 3296 8151
      3290 8147 3288 8148 3288 8145 3285 8146
      3284 8142 3278 8143 3277 8142 3277 8143
      3274 8141 3270 8143 3265 8139 3263 8142
      3260 8139 3257 8143 3253 8165 3267 8187
TIME...MOT...LOC 1747Z 259DEG 13KT 3267 8170

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 2:31 PM EDTSevere Thunderstorm WarningCHSAllendale, Hampton59 min
Aug 18, 3:21 PM EDTCoastal Flood AdvisoryCHS6 hr
Aug 18, 3:56 PM EDTAreal Flood AdvisoryCHSCharleston94 min
Aug 18, 4:24 PM EDTSpecial Weather StatementCHSJasper36 min
Aug 18, 4:33 PM EDTSpecial Weather StatementCHSColleton27 min
Aug 18, 4:47 PM EDTSevere Thunderstorm WarningCHSCharleston, Colleton58 min
Aug 18, 5:58 PM EDTSpecial Weather StatementCHSBerkeley32 min
Aug 18, 6:34 PM EDTSpecial Weather StatementCHSBerkeley26 min
Aug 18, 2:47 PM EDTSpecial Weather StatementCHSCandler28 min
Aug 18, 3:14 PM EDTSpecial Weather StatementCHSEffingham31 min
Aug 18, 3:22 PM EDTSpecial Weather StatementCHSCandler23 min
Aug 18, 3:46 PM EDTSpecial Weather StatementCHSEffingham29 min
Aug 18, 4:17 PM EDTSpecial Weather StatementCHSEffingham43 min
Aug 18, 4:37 PM EDTSevere Thunderstorm WarningCHSBryan52 min
Aug 18, 5:20 PM EDTSpecial Weather StatementCHSLiberty25 min
Aug 18, 5:28 PM EDTSevere Thunderstorm WarningCHSLiberty, Long62 min

Nearby

Special Weather Statements in Georgia, 2020Every special weather statement in 2020

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.