Alert archive / South Carolina / Special Marine Warnings in 2021

Special Marine Warning 112, NWS Charleston, SC

September 20, 2021

NWS Charleston, SC issued this special marine warning at Sep 20, 2021, 3:31 PM EDT. It was in force for 119 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 20, 2021, 3:31 PM EDT (19:31 UTC)
Expired
Sep 20, 2021, 5:30 PM EDT
In force
119 min
Issued by
NWS Charleston, SC
Area
Storm-based polygon
Hail
0.0 in
Wind
34.0 mph

What forecasters said that day

The local office's own words before this special marine 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 special marine warning went out at Sep 20, 2:14 PM EDT, 1 hour 17 minutes earlier.

Area forecast discussion, Sep 20, 2:14 PM EDT, 1 hour 17 minutes before
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Hazardous weather outlook, Sep 20, 11:20 AM EDT, 4 hours 11 minutes before
Hazardous Weather Outlook
National Weather Service Charleston SC
1120 AM EDT Mon Sep 20 2021

SCZ049-050-211530-
Coastal Colleton-Charleston-
1120 AM EDT Mon Sep 20 2021

...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...
...MODERATE RISK FOR RIP CURRENTS IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for southeast South Carolina.

.DAY ONE...This afternoon and tonight.

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

   Flash Flood Watch.
   Moderate Risk for Rip Currents.

Coastal Flooding: Moderate coastal flooding is possible with the
evening high tide. Coastal Flood Advisories could be needed.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Coastal Flooding: Minor coastal flooding will be possible with the
high tides through mid week. Coastal Flood Advisories could be
needed.

Flooding: Pockets of heavy rainfall could occur across much of
southeast South Carolina Tuesday through Wednesday. Minor flooding
of low-lying and poor drainage areas could occur. The risk for flash
flooding could increase if heavy rainfall falls during already
elevated high tides.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

GAZ101-116-118-138-140-SCZ042>045-047-052-211530-
Effingham-Inland Bryan-Inland Chatham-Inland Liberty-Inland McIntosh-
Hampton-Inland Colleton-Dorchester-Inland Berkeley-Inland Jasper-
Tidal Berkeley-
1120 AM EDT Mon Sep 20 2021

...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

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

.DAY ONE...This afternoon and tonight.

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

   Flash Flood Watch.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Flooding: Pockets of heavy rainfall could occur across much of
southeast South Carolina and southeast Georgia Tuesday through
Wednesday. Minor flooding of low-lying and poor drainage areas could
occur.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

GAZ087-088-099-100-114-115-137-SCZ040-211530-
Jenkins-Screven-Candler-Bulloch-Tattnall-Evans-Long-Allendale-
1120 AM EDT Mon Sep 20 2021

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

.DAY ONE...This afternoon and tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Flooding: Pockets of heavy rainfall could occur across much of
southeast South Carolina and southeast Georgia Tuesday through
Wednesday. Minor flooding of low-lying and poor drainage areas could
occur.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

GAZ117-119-139-141-SCZ048-051-211530-
Coastal Bryan-Coastal Chatham-Coastal Liberty-Coastal McIntosh-
Beaufort-Coastal Jasper-
1120 AM EDT Mon Sep 20 2021

...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...
...MODERATE RISK FOR RIP CURRENTS IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

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

.DAY ONE...This afternoon and tonight.

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

   Flash Flood Watch.
   Moderate Risk for Rip Currents.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Flooding: Pockets of heavy rainfall could occur across much of
southeast South Carolina and southeast Georgia Tuesday through
Wednesday. Minor flooding of low-lying and poor drainage areas could
occur. For the coastal areas, the risk for flash flooding could
increase if heavy rainfall falls during already elevated high tides.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

AMZ330-350-352-354-374-211530-
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-
1120 AM EDT Mon Sep 20 2021

This Hazardous Weather Outlook is for Atlantic coastal waters.

.DAY ONE...This afternoon and tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

In the hours before

Local storm report, Sep 20, 10:15 AM EDT, 5 hours 16 minutes before
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Local storm report, Sep 20, 1:25 PM EDT, 2 hours 6 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
125 PM EDT MON SEP 20 2021

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

0109 PM     MARINE TSTM WIND 1 ENE SULLIVANS ISLAND  32.77N  79.82W
09/20/2021  M48 MPH          CHARLESTON         SC   MESONET

            SULLIVANS ISLAND WXFLOW SENSOR REPORTED 42 KNOT WIND
            GUST.

&&

EVENT NUMBER CHS2100647

ETM
Local storm report, Sep 20, 2:32 PM EDT, 59 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
232 PM EDT MON SEP 20 2021

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

0225 PM     MARINE TSTM WIND 4 ESE CHARLESTON        32.75N  79.87W
09/20/2021  M39 MPH          AMZ330             SC   MESONET

            FORT SUMTER WXFLOW SENSOR REPORTED 34 KNOT WIND GUST.

&&

EVENT NUMBER CHS2100648

ETM
Local storm report, Sep 20, 2:35 PM EDT, 56 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
235 PM EDT MON SEP 20 2021

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

0223 PM     MARINE TSTM WIND 1 ESE ISLE OF PALMS     32.78N  79.79W
09/20/2021  M43 MPH          AMZ350             SC   MESONET

            ISLE OF PALMS WXFLOW SENSOR REPORTED 37 KNOT WIND GUST.

&&

EVENT NUMBER CHS2100649

ETM
Local storm report, Sep 20, 2:49 PM EDT, 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
249 PM EDT MON SEP 20 2021

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

0243 PM     MARINE TSTM WIND 2 WSW FOLLY BEACH       32.64N  79.97W
09/20/2021  M47 MPH          CHARLESTON         SC   MESONET

            FOLLY BEACH WXFLOW SENSOR REPORTED 41 KNOT WIND GUST.

&&

EVENT NUMBER CHS2100650

ETM

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 20, 2:50 AM EDTCoastal Flood AdvisoryCHS7 hr
Sep 20, 3:16 AM EDTFlash Flood WatchCHSBerkeley, Colleton, Dorchester, Hampton36 hr
Sep 20, 5:48 AM EDTAreal Flood AdvisoryCHSBeaufort, Charleston, Colleton, Jasper117 min
Sep 20, 7:37 AM EDTAreal Flood AdvisoryCHSBeaufort, Charleston, Colleton113 min
Sep 20, 8:56 AM EDTSmall Craft AdvisoryCHS13 hr
Sep 20, 1:30 PM EDTSpecial Marine WarningCHS2 hr
Sep 20, 3:34 PM EDTCoastal Flood AdvisoryCHS7 hr
Sep 20, 6:40 PM EDTAreal Flood AdvisoryCHSBeaufort, Jasper3 hr
Sep 20, 7:53 PM EDTAreal Flood AdvisoryCHSChatham4 hr

Nearby

Special Marine Warnings in South Carolina, 2021Every special marine warning 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.