Alert archive / South Carolina / Special Weather Statements in 2016

Special Weather Statement, NWS Charleston, SC

July 21, 2016Charleston County, South Carolina

NWS Charleston, SC issued this special weather statement at Jul 21, 2016, 2:03 PM EDT for Charleston County, South Carolina. 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: Jul 21, 2016, 2:03 PM EDT (18:03 UTC)
Expired: Jul 21, 2016, 2:45 PM EDT
In force: 42 min
Issued by: NWS Charleston, SC

County Charleston County, SC

The radar

The Charleston,SC radar (KCLX), 127 km from the middle of the area, began a volume at 18:05 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, 6.1 hours before the alert went out and 27 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: 1413 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1048 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Jul 21, 1:22 PM EDT, 41 minutes earlier.

Area forecast discussion, Jul 21, 1:22 PM EDT, 41 minutes before

Area Forecast Discussion
National Weather Service Charleston SC
122 PM EDT THU JUL 21 2016

.SYNOPSIS...
A weak cold front will sag south of the area today, then slightly
drier high pressure will briefly build in from the north. Atlantic
high pressure will rebuild over the weekend while an inland trough
prevails.

&&

.NEAR TERM /THROUGH TONIGHT/...
The combination of the sea breeze and a shortwave approaching from
the north will generate showers and thunderstorms this afternoon.
Convection should mainly start along the sea breeze and then
develop inland. Some of the storms could become severe with
damaging winds and possibly large hail, especially along mesoscale
boundary collisions. Otherwise, we're on track for another warm
and muggy day with highs mainly in the mid 90s inland and heat
indices around 100 degrees.

Tonight: Showers and thunderstorms will diminish in the evening
with mostly dry conditions overnight, although some rain could
linger near the Altamaha River closer to the deeper moisture.
Some light/shallow fog is possible late, especially where it
recently rained. Low temperatures will mainly range from the mid
70s inland to near 80 at the coast.

&&

.SHORT TERM /FRIDAY THROUGH SUNDAY/...
An expansive upper ridge will build across the area Friday into
Saturday while slightly drier continental high pressure builds in
from the north. With surface dewpoints dropping to 70-72F, despite
toasty temps in the mid 90s, CAPEs will be less than 1,000 J/kg
overall. The sea breeze will be rather weak and late on Friday,
then slightly stronger on Saturday but still late in the day. The
broad mid-level subsidence and limited surface-based instability
point to mainly dry weather Friday-Saturday.

On Sunday the upper ridge flattens out while Atlantic high
pressure starts to rebuild at the surface. Slightly more favorable
conditions aloft, better low-level moisture, and a more active sea
breeze should facilitate isolated afternoon shower/tstms.

&&

.LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/...
The upper ridge gradually breaks down and a more progressive
pattern develops in the long term period. Meanwhile Atlantic high
pressure maintains its control over the area. A more typical late
July pattern is expected though rain chances could be slightly
higher Tuesday into Wednesday due to a weak front approaching from
the north. Highs will generally be in the 90s with maximum heat
indices 105-108F across southeast GA.

&&

.AVIATION /17Z THURSDAY THROUGH MONDAY/...
18Z TAFs: The combination of an upper level disturbance and the
sea breeze will generate showers and thunderstorms this afternoon
and early evening. We have VCTS for both KCHS and KSAV through
early this evening. Brief flight restrictions are possible
resulting from any TSRA that directly impacts either terminal.
As radar trends develop, amendments may be needed to add TEMPO
groups. Convection will decrease late this evening. However,
computer models hint that MVFR is possible in fog that may
develop before daybreak. This will be highly dependent on rainfall
in the area and clearing skies. Given the variations in all of
these factors, we opted to not include mention of this in the
current TAFs.

Extended Aviation Outlook: Brief flight restrictions are possible
with showers/thunderstorms, mainly Sunday and Monday.

&&

.MARINE...
Today and Tonight...High pressure will prevail with a weak
pressure gradient leading to winds mainly 10 kt or less. Seas
mostly 3 feet or less, although building slightly to 4 feet toward
the Gulf Stream. The risk of waterspouts will decrease into this
afternoon as the sea breeze develops.

Friday through Tuesday: Atlantic high pressure will be the
dominant feature, supporting prevailing southerly flow.
Occasional surges will occur, primarily along the coast each
afternoon with the sea breeze and over the nearshore Atlantic
waters at night due to nocturnal jetting.

&&

.CHS WATCHES/WARNINGS/ADVISORIES...
GA...None.
SC...None.
MARINE...None.

&&

SYNOPSIS...
NEAR TERM...
SHORT TERM...
LONG TERM...JRL
AVIATION...
MARINE...

Hazardous weather outlook, Jul 21, 3:33 AM EDT, 10 hours 30 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHARLESTON SC
333 AM EDT THU JUL 21 2016

AMZ330-350-352-354-374-GAZ087-088-099>101-114>119-137>141-SCZ040-
042>045-047>052-221000-
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 EXTENDING FROM 20 TO
60 NM-JENKINS-SCREVEN-CANDLER-BULLOCH-EFFINGHAM-TATTNALL-EVANS-
INLAND BRYAN-COASTAL BRYAN-INLAND CHATHAM-COASTAL CHATHAM-LONG-
INLAND LIBERTY-COASTAL LIBERTY-INLAND MCINTOSH-COASTAL MCINTOSH-
ALLENDALE-HAMPTON-INLAND COLLETON-DORCHESTER-INLAND BERKELEY-
INLAND JASPER-BEAUFORT-COASTAL COLLETON-CHARLESTON-COASTAL JASPER-
TIDAL BERKELEY-
333 AM EDT THU JUL 21 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL
WATERS...SOUTHEAST GEORGIA AND SOUTHEAST SOUTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

SEVERE THUNDERSTORMS...A FEW SEVERE THUNDERSTORMS WITH DAMAGING
WINDS AND LARGE HAIL ARE POSSIBLE THIS AFTERNOON.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

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, Jul 21, 10:23 AM EDT, 3 hours 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1023 AM EDT THU JUL 21 2016

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

1018 AM     WATER SPOUT      5 SSE FOREST BEACH      32.09N  80.70W
07/21/2016                   AMZ352             SC   EMERGENCY MNGR

            EMERGENCY MANAGER IS RECEIVING MULTIPLE REPORTS OF
            WATERSPOUTS OFF OF HILTON HEAD ISLAND. MOST RECENT
            REPORT OF ONGOING WATERSPOUT...POSSIBLY GROWING IN SIZE
            AND/OR STRENGTH...IS OFFSHORE FROM THE SOUTHERN PORTION
            OF THE ISLAND.

&&

EVENT NUMBER CHS1600651

JMC

Local storm report, Jul 21, 10:58 AM EDT, 3 hours 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1058 AM EDT THU JUL 21 2016

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

0950 AM     WATER SPOUT      5 ESE FOREST BEACH      32.13N  80.66W
07/21/2016                   AMZ352             SC   EMERGENCY MNGR

            EMERGENCY MANAGER IS BEGINNING TO RECEIVE REPORTS OF A
            WATERSPOUT OFFSHORE OF THE MIDDLE PORTION OF HILTON HEAD
            ISLAND.

&&

EVENT NUMBER CHS1600652

JMC

Local storm report, Jul 21, 11:39 AM EDT, 2 hours 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1139 AM EDT THU JUL 21 2016

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

0552 PM     TSTM WND DMG     3 SSE CLYO              32.44N  81.23W
07/20/2016                   EFFINGHAM          GA   EMERGENCY MNGR

            EMERGENCY MANAGER REPORTED A POWER POLE AND CONNECTED
            LINES DOWN...AND AT LEAST ONE TREE NEARBY...IN THE
            VICINITY OF THE 400 BLOCK OF WHITAKER RD. TIME ESTIMATED
            BASED ON RADAR.

&&

EVENT NUMBER CHS1600653

JMC

Local storm report, Jul 21, 11:49 AM EDT, 2 hours 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1149 AM EDT THU JUL 21 2016

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

1050 AM     WATER SPOUT      2 ESE TYBEE ISLAND      32.00N  80.83W
07/21/2016                   AMZ354             GA   LIFEGUARD

            TYBEE OCEAN RESCUE REPORTED WATERSPOUTS SIGHTED
            OFFSHORE FROM NEAR 8TH AND 15TH STREETS.

&&

EVENT NUMBER CHS1600654

JMC

Local storm report, Jul 21, 12:01 PM EDT, 2 hours 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1201 PM EDT THU JUL 21 2016

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

0555 PM     TSTM WND DMG     3 NNE STILLWELL         32.42N  81.22W
07/20/2016                   EFFINGHAM          GA   EMERGENCY MNGR

            EMERGENCY MANAGER REPORTED A TREE DOWN ON UNION SPRINGS
            RD. TIME ESTIMATED BASED ON RADAR.

&&

EVENT NUMBER CHS1600655

JMC

Special weather statement, Jul 21, 2:03 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
203 PM EDT THU JUL 21 2016

SCZ050-211845-
CHARLESTON SC-
203 PM EDT THU JUL 21 2016

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF CHARLESTON COUNTY
UNTIL 245 PM EDT...

AT 202 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR GARRIS LANDING...OR 13 MILES NORTHEAST OF
MOUNT PLEASANT...MOVING SOUTH AT 5 MPH.

  HAZARD...STRONG WINDS 45 TO 55 MPH AND UP TO PENNY SIZED HAIL.

  IMPACT...EXPECT MINOR DAMAGE TO TREE LIMBS AND BLOWING AROUND OF
           LIGHT...UNSECURED OBJECTS. MINOR HAIL DAMAGE TO PLANTS...
           TREES AND CROPS IS POSSIBLE. DAMAGE TO WINDSHIELDS IS
           UNLIKELY.

SOME LOCATIONS IN THE PATH OF THIS STORM INCLUDE...
MOUNT PLEASANT...ISLE OF PALMS...SULLIVAN'S ISLAND...AWENDAW...BULL
ISLAND...GARRIS LANDING...MOUNT PLEASANT REGIONAL AIRPORT AND MOUNT
PLEASANT TOWNE CENTRE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BEACHES ARE ESPECIALLY DANGEROUS DURING THUNDERSTORMS BECAUSE
LIGHTNING WILL USUALLY STRIKE THE TALLEST OBJECT IN THE VICINITY.
MOVE OFF BEACHES AND GET IN A STURDY STRUCTURE OR AUTOMOBILE
IMMEDIATELY. MANY PEOPLE HAVE BEEN KILLED BY LIGHTNING ON BEACHES IN
THE SOUTHEASTERN UNITED STATES.

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 3288 7955 3274 7982 3275 7988 3292 7982
      3295 7977 3299 7977 3302 7973 3299 7952
TIME...MOT...LOC 1802Z 005DEG 6KT 3295 7971

DPB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 9:59 AM EDT	Special Marine Warning	CHS		61 min
Jul 21, 10:45 AM EDT	Special Marine Warning	CHS		60 min
Jul 21, 2:12 PM EDT	Severe Thunderstorm Warning	CHS	Berkeley, Charleston	63 min
Jul 21, 2:15 PM EDT	Severe Thunderstorm Warning	CHS	Colleton, Dorchester	60 min
Jul 21, 2:58 PM EDT	Special Weather Statement	CHS	Dorchester	47 min
Jul 21, 3:13 PM EDT	Severe Thunderstorm Warning	CHS	Berkeley, Charleston, Dorchester	48 min
Jul 21, 3:15 PM EDT	Special Marine Warning	CHS		90 min
Jul 21, 3:22 PM EDT	Severe Thunderstorm Warning	CHS	Colleton, Dorchester	68 min
Jul 21, 4:44 PM EDT	Special Weather Statement	CHS	Beaufort	46 min
Jul 21, 4:53 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort, Colleton	67 min
Jul 21, 5:36 PM EDT	Special Weather Statement	CHS	Jasper	39 min
Jul 21, 6:00 PM EDT	Special Weather Statement	CHS	Jasper	45 min
Jul 21, 7:09 PM EDT	Special Weather Statement	CHS	Hampton	51 min

Nearby

Special Weather Statements in South Carolina, 2016 Every special weather statement in 2016

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.