Alert archive / South Carolina / Special Weather Statements in 2015
Special Weather Statement, NWS Columbia, SC
NWS Columbia, SC issued this special weather statement at Jul 20, 2015, 7:41 PM EDT for Lancaster County, South Carolina. It was in force for 34 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 20, 2015, 7:41 PM EDT (23:41 UTC)
- Expired
- Jul 20, 2015, 8:15 PM EDT
- In force
- 34 min
- Issued by
- NWS Columbia, SC
County Lancaster County, SC
The radar
The Columbia radar (KCAE), 82 km from the middle of the area, began a volume at 23:43 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
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 11.7 hours before the alert went out and 180 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
- 207 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 1335 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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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 Columbia, SC wrote its last area forecast discussion before this special weather statement went out at Jul 20, 7:36 PM EDT, 5 minutes earlier.
Area forecast discussion, Jul 20, 7:36 PM EDT, 5 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE COLUMBIA SC 736 PM EDT MON JUL 20 2015 .SYNOPSIS... A RIDGE OF HIGH PRESSURE WILL DOMINATE THROUGH MID WEEK WITH AN UPPER LEVEL DISTURBANCE APPROACHING THE SOUTHEAST US WEDNESDAY. ABOVE NORMAL TEMPERATURES EARLY IN THE PERIOD WITH A SLIGHT COOLING TREND BY THE END OF THE WEEK. SCATTERED DIURNAL THUNDERSTORMS EACH DAY. && .NEAR TERM /UNTIL 6 AM TUESDAY MORNING/... A WEAK SURFACE TROUGH REMAINS OVER THE CENTRAL FORECAST AREA (FA). FLAT UPPER RIDGE CENTERED TO OUR WEST WITH A WEAK UPPER TROUGH TO OUR NE. WEAK WNW TO NW FLOW ALOFT OVER OUR REGION. WEAK UPPER IMPULSE CURRENTLY PASSING BY JUST TO OUR EAST..WITH SOME SLIGHTLY DRIER AIR ALOFT AND WEAK NVA BEHIND IT. THIS...ALONG WITH LATEST RUC SOUNDINGS INDICATING SOME WEAK CAPPING AROUND H7 AND HIGH LFC AND CONVECTIVE TEMPS...APPEARS TO BE ACTING TO SUPPRESS AREAL COVERAGE OF CONVECTION THUS FAR. LATEST MESOANALYSIS INDICATES A SLIGHTLY DRIER ATMOSPHERE IN PLACE...WITH GENERALLY MODERATE INSTABILITIES. DCAPE VALUES ARE QUITE HIGH THOUGH...AROUND 1500 J/KG NEAR THE CSRA. NEXT SHORTWAVE CURRENTLY OVER E TENN...AND WILL PUSH SE INTO OUR REGION TONIGHT. LATEST HIGH RESOLUTION MODELS PROJECT MINIMAL CONVECTIVE ACTIVITY IN THE NEAR TERM OVER MOST OF THE FA...BUT SCATTERED CONVECTION MOVING INTO OR DEVELOPIONG OVER THE WESTERN PIEDMONT AND CSRA THIS EVENING AND EARLY TONIGHT. AN ISOLATED STRONGER STORM COULD BECOME SEVERE AND PRODUCE STRONG WIND GUSTS...GIVEN INDICATIONS OF STRONG DCAPE VALUES. WILL INDICATE MAINLY ISOLATED TO SLIGHT CHANCE THUNDER MOST AREAS...EXCEPT TRENDING UP TO LOW END CHANCE WESTERN PIEDMONT AND CSRA THIS EVENING AND EARLY TONIGHT. && .SHORT TERM /6 AM TUESDAY MORNING THROUGH WEDNESDAY/... SURFACE TROUGH HANGS IN OVER THE FORECAST AREA AHEAD OF AN APPROACHING COLD FRONT THOUGH WEDNESDAY. FAIRLY ACTIVE PATTERN WITH SERIES OF MOSTLY WEAK SHORTWAVES MOVING NEAR THE AREA IN A WESTERLY FLOW ALOFT...A MORE PRONOUNCED SHORTWAVE WILL PUSH ACROSS THE REGION LATE WEDNESDAY. SPC CURRENTLY HAS US IN GENERAL THUNDER BUT COULD HAVE A FEW STRONGER STROMS ALONG COLD FRONT. MAY NEED A HEAT ADVISORY FOR SOUTHERN HALF OF CWA TUESDAY AFTERNOON 18-22Z OR SO...ENDED UP HAVING TO ISSUE ONE THIS AFTERNOON FOR AREAS SOUTH. DEWPOINTS IN LOWER 70S AND TEMPS AROUND 100 WILL BRING APPARENT TEMPS UP TO NEAR ADVISORY CRITERIA. GUIDANCE CONSENSUS FOR THE TEMPERATURE FORECAST SEEMS REASONABLE. && .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/... EXTENDED GUIDANCE KEEPS UPPER RIDGE OVER CENTRAL US WITH TROUGH OVER THE NE US. WEAK SHORTWAVES IN THE WEST TO NORTHWEST FLOW ALOFT WILL PROVIDE A TRIGGER FOR MAINLY SCATTERED CONVECTION. BEST CHANCE WHEN TRIGGER COINCIDES WITH BEST DIURNAL HEATING. TEMPERATURES LOWERING TO NEAR CLIMATOLOGY...LOWER TO MID 90S...BY THE WEEKEND. 20 TO 40 PERCENT POPS THROUGH THE PERIOD. && .AVIATION /00Z TUESDAY THROUGH SATURDAY/... VFR CONDITIONS EXPECTED OUTSIDE OF AFTERNOON/EVENING THUNDERSTORMS. A SURFACE TROUGH OVER THE REGION AND APPROACHING SHORTWAVE ENERGY WILL PROMOTE SCATTERED CONVECTION THIS EVENING...ESPECIALLY IN THE CSRA. RADAR AT 23Z INDICATING SHOWERS/THUNDERSTORMS DEVELOPING NEAR AGS/DNL TERMINALS. BASED ON TRENDS...HIGHER CHANCE TO IMPACT DNL THRU 04Z. OTHERWISE HIGH BASED CUMULUS. FOG POTENTIAL APPEARS LOW WITH TEMPERATURES REMAINING WARM OVERNIGHT AND DEVELOPING LOW LEVEL JET 25 TO 30 KNOTS. SCATTERED DIURNAL CONVECTION POSSIBLE AGAIN TUESDAY AFTERNOON. EXTENDED AVIATION OUTLOOK...RESTRICTIONS EXPECTED IN DIURNAL CONVECTION TUESDAY THROUGH FRIDAY. AREAS OF MVFR VSBYS POSSIBLE DURING THE EARLY MORNING EACH DAY. && .CAE WATCHES/WARNINGS/ADVISORIES... SC...NONE. GA...NONE. &&
Hazardous weather outlook, Jul 20, 3:07 AM EDT, 16 hours 34 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE COLUMBIA SC 307 AM EDT MON JUL 20 2015 GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041- 210715- LINCOLN-MCDUFFIE-COLUMBIA-RICHMOND-BURKE-LANCASTER-CHESTERFIELD- MCCORMICK-NEWBERRY-FAIRFIELD-KERSHAW-EDGEFIELD-SALUDA-LEXINGTON- RICHLAND-LEE-AIKEN-SUMTER-BARNWELL-ORANGEBURG-CALHOUN-CLARENDON- BAMBERG- 307 AM EDT MON JUL 20 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL GEORGIA AND CENTRAL SOUTH CAROLINA. .DAY ONE...TODAY AND TONIGHT A FEW THUNDERSTORMS THIS AFTERNOON AND EVENING COULD POSSIBLY CONTAIN DAMAGING WIND. HEAVY RAINFALL WITH A FEW OF THE STORMS COULD ALSO LEAD TO LOCALIZED FLOODING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
In the hours before
Special weather statement, Jul 20, 7:41 PM EDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
741 PM EDT MON JUL 20 2015
SCZ015-022-210015-
LANCASTER-KERSHAW-
741 PM EDT MON JUL 20 2015
...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN LANCASTER AND
NORTHWESTERN KERSHAW COUNTIES...
AT 741 PM EDT...A STRONG THUNDERSTORM WAS NEAR ELGIN...OR 7 MILES
SOUTH OF LANCASTER...MOVING SOUTHEAST AT 20 MPH.
WIND GUSTS OF 45 TO 55 MPH AND HALF INCH HAIL ARE POSSIBLE WITH THIS
STORM.
LOCATIONS IMPACTED INCLUDE...
LANCASTER...KERSHAW...ELGIN...HEATH SPRINGS...IRWIN AND LANCASTER
MILL.
LAT...LON 3464 8044 3439 8057 3456 8088 3457 8088
3472 8079
TIME...MOT...LOC 2341Z 294DEG 15KT 3461 8076The office that day
Everything else NWS Columbia, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 11:37 AM EDT | Heat Advisory | CAE | Aiken, Bamberg, Barnwell, Calhoun, Clarendon, Edgefield and 1 more | 6 hr |
Nearby
Special Weather Statements in South Carolina, 2015Every special weather statement in 2015
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.