Alert archive / Georgia / Special Weather Statements in 2017
Special Weather Statement, NWS Charleston, SC
NWS Charleston, SC issued this special weather statement at Aug 7, 2017, 5:18 PM EDT for Effingham 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 7, 2017, 5:18 PM EDT (21:18 UTC)
- Expired
- Aug 7, 2017, 6:00 PM EDT
- In force
- 42 min
- Issued by
- NWS Charleston, SC
County Effingham County, GA
The radar
The Charleston,SC radar (KCLX), 48 km from the middle of the area, began a volume at 21:20 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, 9.3 hours before the alert went out and 138 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.
- Mixed-layer CAPE
- 1145 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 886 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>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 7, 3:49 PM EDT, 1 hour 29 minutes earlier.
Area forecast discussion, Aug 7, 3:49 PM EDT, 1 hour 29 minutes before
Area Forecast Discussion National Weather Service Charleston SC 349 PM EDT Mon Aug 7 2017 .SYNOPSIS... A front will drop into the area Tuesday, lingering into Thursday before lifting back north. High pressure will rebuild Friday through early next week. && .NEAR TERM /THROUGH TONIGHT/... At mid afternoon: Scattered showers and thunderstorms continue across the forecast area but updraft strength has generally been unimpressive since the onset. Scattered showers and tstms will persist mainly inland from beaches and barrier islands through late afternoon. The overall severe threat is low, however stronger storms may produce some gusty winds given the decent deep layered wind fields and swift storm motions. Tonight: Diurnal convection is expected to diminish this evening. Overnight, deeper moisture and some broad upper difluence will gradually increase from west to east. Lower level convergence is forecast to increase across southeast SC and to the north of I-16 in GA as a cold front approaches northwest Ga late. We maintained chance POPs overnight in this region with much uncertainty on how the coverage of nocturnal convection plays out given the myriad of mesoscale boundaries that will linger across the this evening. The GFS was a wet outlier and we leaned toward a persistence forecast overall. Mild overnight minimum temps will be in the mid 70s inland to the upper 70s coast. Low level wind fields appear too strong for any fog concerns. && .SHORT TERM /TUESDAY THROUGH THURSDAY/... Mid-level troughing will prevail over the East Coast. At the surface, a cold front will approach from the north on Tuesday, then linger nearby as a stationary front until Thursday. Deep moisture will be in place with PWATs ~2.2" each day. Lift will be in the form of the front and a series of shortwaves moving through. The end result will be a wet pattern with plenty of showers and thunderstorms. Instability is not impressive, especially for this time of year, so the severe risk will be low each day. The main threat will be heavy rainfall due to the weak mid-level winds. More so Tuesday and Wednesday due to the proximity of the front to our area. Temperatures will be several degrees below normal each day due to abundant clouds and a high areal coverage of precipitation. && .LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/... An upper ridge will gradually strengthen over the eastern United States late week through the weekend while Bermuda high pressure strengthens to our east. Diurnal convection will become less numerous as time wears on. Meanwhile high temps will gradually increase. && .AVIATION /19Z MONDAY THROUGH SATURDAY/... VFR conditions expected to prevail through 18z Tuesday. Showers and thunderstorms have been skirting the terminals and direct impacts were looking less and less likely at 1930Z. Outside of convection, gusts around 20 knots have been occurring in south to southwest flow this afternoon. There could be another uptick in showers and isolated tstms later tonight and on Tuesday morning, confidence too low for any TAF inclusions at this time. Extended Aviation Outlook: Showers and tstms may occasionally affect the terminals, with temporary visibility restrictions the primary concern. && .MARINE... We have seen borderline SCA conditions along the Charleston County coast this afternoon with elevated platforms and some intra-coastal sites reporting 25 knots occasionally. Models indicate 1000 MB geostrophic flow peaking late this afternoon but still remaining fairly constant near 25 knots overnight. We have conditions just below SCA levels overnight along the central SC coast with 20 knots and seas 4-5 ft. If conditions warrant, a SCA may still be required. Elsewhere, southwest flow will remain elevated overnight in the 15 knot range with seas 3-4 ft. Tuesday through Saturday: A cold front will move over the area from the north on Tuesday, then linger nearby as a stationary front until Thursday, finally transitioning into a warm front and moving back to the north on Friday. Atlantic high pressure will build Friday through early next week. Winds will generally stay below 10 kt through Thursday, perhaps increasing into the weekend. && .CHS WATCHES/WARNINGS/ADVISORIES... GA...None. SC...None. MARINE...None. && NEAR TERM... SHORT TERM...MS LONG TERM... AVIATION...MS MARINE...MS
Hazardous weather outlook, Aug 7, 3:57 AM EDT, 13 hours 21 minutes before
Hazardous Weather Outlook National Weather Service Charleston SC 357 AM EDT Mon Aug 7 2017 AMZ330-350-352-354-374-GAZ087-088-099>101-114>119-137>141-SCZ040- 042>045-047>049-051-052-080800- 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-Coastal Jasper- Tidal Berkeley- 357 AM EDT Mon Aug 7 2017 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...Tuesday through Sunday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time. SCZ050-080800- Charleston- 357 AM EDT Mon Aug 7 2017 ...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. .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
Special weather statement, Aug 7, 3:00 PM EDT, 2 hours 18 minutes before
Special Weather Statement
National Weather Service Charleston SC
300 PM EDT MON AUG 7 2017
GAZ101-SCZ042-047-048-051-071945-
Effingham-Inland Jasper-Coastal Jasper-Hampton-Beaufort-
300 PM EDT MON AUG 7 2017
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF EFFINGHAM...
BEAUFORT...HAMPTON AND JASPER COUNTIES...
At 300 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorm near Ebenezer, or 8 miles east of Springfield,
moving northeast at 30 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...
Beaufort, Ridgeland, Springfield, Clarendon, Rincon, Grahamville,
Ebenezer and Coosawhatchie.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 3224 8122 3237 8138 3275 8103 3248 8070
TIME...MOT...LOC 1900Z 228DEG 33KT 3242 8117
ECTSpecial weather statement, Aug 7, 3:58 PM EDT, 1 hour 20 minutes before
Special Weather Statement
National Weather Service Charleston SC
358 PM EDT MON AUG 7 2017
SCZ042-043-047>049-051-072045-
Coastal Colleton-Inland Jasper-Coastal Jasper-Hampton-Beaufort-Inland
Colleton-
358 PM EDT MON AUG 7 2017
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BEAUFORT...HAMPTON...
COLLETON AND JASPER COUNTIES...
At 358 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorm over Yemassee, moving northeast at 25 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...
Walterboro, Yemassee, Clarendon, Coosawhatchie, Gardens Corner,
Grays, Ritter and Hendersonville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 3242 8090 3272 8108 3305 8075 3268 8042
TIME...MOT...LOC 1958Z 224DEG 23KT 3270 8087
ECTSpecial weather statement, Aug 7, 5:18 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Charleston SC
518 PM EDT MON AUG 7 2017
GAZ101-116-118-SCZ047-051-072200-
Effingham-Inland Chatham-Inland Bryan-Inland Jasper-Coastal Jasper-
518 PM EDT MON AUG 7 2017
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BRYAN...EFFINGHAM...
CHATHAM AND JASPER COUNTIES...
At 517 PM EDT, National Weather Service doppler radar indicated
strong thunderstorms near Bloomingdale, or 7 miles northwest of
Pooler, moving northeast at 30 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...
Savannah, Pooler, Springfield, Jasper, Rincon, Port Wentworth,
Hardeeville and Bloomingdale.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 3223 8149 3224 8143 3228 8145 3255 8118
3233 8093 3230 8096 3231 8100 3228 8100
3202 8139 3216 8156
TIME...MOT...LOC 2117Z 231DEG 26KT 3221 8130
ECTThe office that day
Everything else NWS Charleston, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 3:00 PM EDT | Special Weather Statement | CHS | Jasper | 45 min |
| Aug 7, 3:58 PM EDT | Special Weather Statement | CHS | Colleton | 47 min |
| Aug 7, 7:18 PM EDT | Special Weather Statement | CHS | Evans, Tattnall | 42 min |
Nearby
Special Weather Statements in Georgia, 2017Every special weather statement in 2017
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.