Alert archive / South Carolina / Heat Advisories in 2011

Heat Advisory 1, NWS Wilmington, NC

June 20, 20114 counties in South Carolina

NWS Wilmington, NC issued this heat advisory at Jun 20, 2011, 3:29 AM EDT for 4 counties in South Carolina. It took effect at Jun 20, 2011, 12:00 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Jun 20, 2011, 3:29 AM EDT (07:29 UTC)
In effect from
Jun 20, 2011, 12:00 PM EDT
Expired
Jun 20, 2011, 8:00 PM EDT
In force
8 hr
Issued by
NWS Wilmington, NC

Counties Darlington County, SC, Florence County, SC, Georgetown County, SC, Williamsburg County, SC

The radar

The Wilmington radar (KLTX), 116 km from the middle of the area, began a volume at 07:29 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 00:00Z, 7.5 hours before the alert went out and 110 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 00:00Z on 2011-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3205 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 00:00Z on 2011-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 square meters per square second.193958Sfc1 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
3205 J/kg
Mixed-layer CIN
-45 J/kg
Mixed-layer LCL
1266 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
171 m²/s²
Significant tornado parameter
1.0
Supercell composite
5.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Wilmington, NC wrote its last area forecast discussion before this heat advisory went out at Jun 20, 3:20 AM EDT, 9 minutes earlier.

Area forecast discussion, Jun 20, 3:20 AM EDT, 9 minutes before
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Hazardous weather outlook, Jun 19, 11:29 PM EDT, 4 hours before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE WILMINGTON NC
1129 PM EDT SUN JUN 19 2011

NCZ087-096-099-105>110-SCZ017-023-024-032-033-039-053>056-210330-
ROBESON-BLADEN-COLUMBUS-INLAND PENDER-COASTAL PENDER-
INLAND NEW HANOVER-COASTAL NEW HANOVER-INLAND BRUNSWICK-
COASTAL BRUNSWICK-MARLBORO-DARLINGTON-DILLON-FLORENCE-MARION-
WILLIAMSBURG-INLAND HORRY-COASTAL HORRY-INLAND GEORGETOWN-
COASTAL GEORGETOWN-
1129 PM EDT SUN JUN 19 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST NORTH CAROLINA AND
NORTHEAST SOUTH CAROLINA.

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORM ACTIVITY DURING MONDAY
AFTERNOON AND EVENING. BOTH HAIL 1 INCH OR GREATER AND DAMAGING
WIND GUSTS WILL BE THE PRIMARY THREATS.

HEAT INDEX VALUES MAY REACH 105 DEGREES FOR SEVERAL HOURS DURING
THE AFTERNOONS MONDAY THROUGH WEDNESDAY. THIS LEVEL OF HEAT AND
HUMIDITY CAN CAUSE HEAT ILLNESSES OR HEAT STROKE IF STRENUOUS
OUTDOOR WORK IS PERFORMED WITHOUT ADEQUATE PROTECTION. HEAT
ADVISORIES WILL BE ISSUED SHOULD THIS THREAT DEVELOP.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

AMZ250-252-254-256-210330-
SURF CITY TO CAPE FEAR NC OUT 20 NM-
CAPE FEAR NC TO LITTLE RIVER INLET SC OUT 20 NM-
LITTLE RIVER INLET TO MURRELLS INLET SC OUT 20 NM-
MURRELLS INLET TO SOUTH SANTEE RIVER SC OUT 20 NM-
1129 PM EDT SUN JUN 19 2011

...SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL 9 AM EDT MONDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ADJACENT COASTAL WATERS.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   SMALL CRAFT EXERCISE CAUTION.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

THUNDERSTORM ACTIVITY WILL MOVE OFF THE MAINLAND OF THE CAROLINAS
AND INTO THE ADJACENT ATLANTIC WATERS DURING MONDAY AFTERNOON AND
EVENING. A FEW OF THESE STORMS WILL BECOME STRONG ENOUGH TO
PRODUCE WIND GUSTS UP TO 35 KT OR GREATER. IN ADDITION...SQUALL
LIKE CONDITIONS WILL OCCUR WITH VISIBILITY REDUCED TO LESS THAN
1/2 MILE AT TIMES ALONG WITH FREQUENT TO CONTINUOUS CLOUD TO OCEAN
LIGHTNING.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   SMALL CRAFT EXERCISE CAUTION.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

DCH

In the hours before

Special weather statement, Jun 20, 12:03 AM EDT, 3 hours 26 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON NC
1203 AM EDT MON JUN 20 2011

NCZ087-096-200445-
ROBESON-BLADEN-
1203 AM EDT MON JUN 20 2011

...STRONG THUNDERSTORM OVER ROBESON COUNTY NORTH OF LUMBERTON...

AT 1202 AM EDT...A STRONG THUNDERSTORM WAS LOCATED 3 MILES SOUTH OF
ST. PAULS...OR 9 MILES NORTH OF LUMBERTON...MOVING EAST AT 30 MPH.

THIS THUNDERSTORM HAS THE CAPABILITY OF PRODUCING SMALL HAIL UP TO
THE SIZE OF DIMES...GUSTY WINDS OF 40 MPH AND FREQUENT DANGEROUS
LIGHTNING. UPWARDS OF ONE INCH OF RAIN COULD ALSO FALL IN A VERY
SHORT PERIOD OF TIME.

COMMUNITIES POTENTIALLY IN THE PATH OF THESE STORMS INCLUDE
AMMON...DUART...EMERSON...HOWELLSVILLE...JEROME...RUSKIN...ST.
PAULS...TOBERMORY...TOLARSVILLE...WHITE OAK...DUBLIN AND RENNERT.

STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER DETAILS OR UPDATES. FOR
ADDITIONAL WEATHER INFORMATION...SEE OUR WEB SITE AT
WEATHER.GOV/ILM.

LAT...LON 3484 7890 3485 7882 3485 7856 3462 7858
      3470 7909 3484 7909 3486 7892

TRA
Special weather statement, Jun 20, 12:41 AM EDT, 2 hours 48 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON NC
1241 AM EDT MON JUN 20 2011

NCZ096-200515-
BLADEN-
1241 AM EDT MON JUN 20 2011

...STRONG THUNDERSTORM OVER NORTHERN BLADEN COUNTY...

AT 1240 AM EDT...A STRONG THUNDERSTORM WAS CENTERED 4 MILES EAST OF
RUSKIN...OR 8 MILES NORTH OF ELIZABETHTOWN...MOVING EAST AT 35 MPH.
THIS STORM IS LIKELY PRODUCING SMALL HAIL UP TO THE SIZE OF DIMES
AND WIND GUSTS TO 40 MPH. FREQUENT LIGHTNING AND HEAVY RAINFALL ARE
ALSO EXPECTED IN THIS STORM.

COMMUNITIES IN THE PATH OF THESE STORMS INCLUDE AMMON AND RUSKIN.

STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER DETAILS OR UPDATES.
FOR ADDITIONAL WEATHER INFORMATION...CHECK OUR WEB SITE AT
WEATHER.GOV/ILM.

LAT...LON 3483 7846 3478 7842 3475 7838 3473 7838
      3470 7836 3470 7835 3467 7832 3465 7832
      3464 7869 3483 7870 3485 7849

TRA

The office that day

Everything else NWS Wilmington, NC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 20, 12:03 AM EDTSpecial Weather StatementILMRobeson42 min
Jun 20, 12:41 AM EDTSpecial Weather StatementILMBladen34 min
Jun 20, 12:47 AM EDTSevere Thunderstorm WarningILMBladen13 min

Nearby

Heat Advisories in South Carolina, 2011Every heat advisory in 2011

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.