Alert archive / North Carolina / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 199, NWS Raleigh, NC

August 5, 2010Orange County, North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at Aug 5, 2010, 3:27 PM EDT for Orange County, North Carolina. It was in force for 32 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
Aug 5, 2010, 3:27 PM EDT (19:27 UTC)
Expired
Aug 5, 2010, 3:59 PM EDT
In force
32 min
Issued by
NWS Raleigh, NC
Area
Storm-based polygon

County Orange County, NC

The radar

The Raleigh/Durham radar (KRAX), 72 km from the middle of the area, began a volume at 19:26 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, 7.5 hours before the alert went out and 70 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, Greensboro/Hi Pt, NC at 12:00Z on 2010-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2373 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, Greensboro/Hi Pt, NC at 12:00Z on 2010-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 square meters per square second.1939Sfc1 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
2373 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
930 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
66 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.0

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Raleigh, NC wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 5, 3:25 PM EDT, 2 minutes earlier.

Area forecast discussion, Aug 5, 3:25 PM EDT, 2 minutes before
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Hazardous weather outlook, Aug 5, 12:26 PM EDT, 3 hours 1 minute before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RALEIGH NC
1226 PM EDT THU AUG 5 2010

NCZ007-021-038-061630-
PERSON-FORSYTH-DAVIDSON-
1226 PM EDT THU AUG 5 2010

...HEAT ADVISORY IN EFFECT UNTIL 7 PM EDT THIS EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NORTH 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.

   HEAT ADVISORY.

ALSO...THERE IS A RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING...WITH A PRIMARY THREAT OF DAMAGING WIND GUSTS AND
FREQUENT TO EXCESSIVE LIGHTNING.

SEVERE STRAIGHT LINE WINDS CAN CAUSE AS MUCH DAMAGE AS TORNADOES.
WHEN SEVERE WINDS STRIKE... TAKE COVER IN AN INTERIOR BATHROOM...
CLOSET... OR HALLWAY ON THE LOWEST FLOOR.

EVERY THUNDERSTORM PRODUCES DEADLY LIGHTNING...AND NO PLACE
OUTSIDE IS SAFE. LIGHTNING CAN STRIKE 20 MILES AWAY FROM A STORM.
IF SOMEONE IS STRUCK BY LIGHTNING... SEEK MEDICAL CARE
IMMEDIATELY. LIGHTNING STRIKES CAN RESULT IN CARDIAC ARREST... AND
QUICK RESPONSE IS VITAL. WHEN THUNDER ROARS... GO INDOORS.

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

SEVERE STORMS ARE POSSIBLE AGAIN ON FRIDAY AFTERNOON AS A COLD
FRONT APPROACHES FROM THE NORTHWEST.

NCZ008>011-022>028-039>043-073>078-083>086-088-089-061630-
GRANVILLE-VANCE-WARREN-HALIFAX-GUILFORD-ALAMANCE-ORANGE-DURHAM-
FRANKLIN-NASH-EDGECOMBE-RANDOLPH-CHATHAM-WAKE-JOHNSTON-WILSON-STANLY-
MONTGOMERY-MOORE-LEE-HARNETT-WAYNE-ANSON-RICHMOND-SCOTLAND-HOKE-
CUMBERLAND-SAMPSON-
1226 PM EDT THU AUG 5 2010

...HEAT ADVISORY IN EFFECT UNTIL 7 PM EDT THIS EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NORTH 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.

   HEAT ADVISORY.

ALSO...THERE IS A RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING...WITH A PRIMARY THREAT OF DAMAGING WIND GUSTS AND FREQUENT
TO EXCESSIVE LIGHTNING..

SEVERE STRAIGHT LINE WINDS CAN CAUSE AS MUCH DAMAGE AS TORNADOES.
WHEN SEVERE WINDS STRIKE... TAKE COVER IN AN INTERIOR BATHROOM...
CLOSET... OR HALLWAY ON THE LOWEST FLOOR.

EVERY THUNDERSTORM PRODUCES DEADLY LIGHTNING...AND NO PLACE
OUTSIDE IS SAFE. LIGHTNING CAN STRIKE 20 MILES AWAY FROM A STORM.
IF SOMEONE IS STRUCK BY LIGHTNING... SEEK MEDICAL CARE
IMMEDIATELY. LIGHTNING STRIKES CAN RESULT IN CARDIAC ARREST... AND
QUICK RESPONSE IS VITAL. WHEN THUNDER ROARS... GO INDOORS.

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

SEVERE STORMS ARE POSSIBLE AGAIN ON FRIDAY AFTERNOON AND EVENING
AS A COLD FRONT APPROACHES FROM THE NORTHWEST.

In the hours before

Special weather statement, Aug 5, 2:22 PM EDT, 1 hour 5 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
222 PM EDT THU AUG 5 2010

NCZ021-022-038-051955-
DAVIDSON-FORSYTH-GUILFORD-
222 PM EDT THU AUG 5 2010

...STRONG THUNDERSTORMS WILL MOVE INTO FORSYTH...GUILFORD AND
DAVIDSON COUNTIES FROM THE NORTHWEST BETWEEN 300 PM AND 400 PM...

AT 217 PM EDT...DOPPLER RADAR INDICATED A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 15 MILES SOUTHWEST OF
MOUNT AIRY TO 35 MILES WEST OF MOCKSVILLE...MOVING EAST AT 20 MPH.
THESE STORMS ARE PRODUCING STRONG WIND GUSTS AND EXTREMELY FREQUENT
DANGEROUS LIGHTNING... AND WILL MOVE INTO THE TRIAD REGION...
INCLUDING INTERSTATES 40 AND 85... AFTER 300 PM.

LOCATIONS IN THE PATH OF THESE STORMS INCLUDE... LEWISVILLE...
CLEMMONS... WINSTON-SALEM... LEXINGTON... STOKESDALE... AND
GREENSBORO.

HAZARDS INCLUDE...
GUSTY WINDS OF 40 TO 50 MPH.
PEA SIZE HAIL.

THESE THUNDERSTORMS ARE PRODUCING AN EXCESSIVE AMOUNT OF LIGHTNING.
SEEK SHELTER INDOORS AND STAY AWAY FROM THE WINDOWS. MANY LIGHTNING
STRIKES WILL OCCUR WELL AHEAD OF THE HEAVY RAIN AND GUSTY WINDS. IF
YOU CANNOT SEEK SHELTER INDOORS TAKE COVER IN A VEHICLE.

TORRENTIAL DOWNPOURS WITH THESE STORMS WILL MAKE DRIVING DIFFICULT.
USE EXTREME CAUTION AND SLOW DOWN IN HEAVY RAIN.

&&

LAT...LON 3612 8045 3626 8046 3624 7967 3602 7976
      3591 8004 3586 8005 3555 8019 3555 8021
      3569 8033 3571 8033 3571 8038 3574 8046
      3583 8049 3584 8040 3589 8041 3590 8037
      3596 8038 3607 8052 3609 8052
TIME...MOT...LOC 1817Z 274DEG 19KT 3639 8087 3593 8115

GIH
Special weather statement, Aug 5, 2:40 PM EDT, 47 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
240 PM EDT THU AUG 5 2010

NCZ022>024-039-040-051945-
ALAMANCE-CHATHAM-GUILFORD-ORANGE-RANDOLPH-
240 PM EDT THU AUG 5 2010

...A STRONG THUNDERSTORM WILL MOVE ACROSS PARTS OF GUILFORD...
ALAMANCE...ORANGE...RANDOLPH AND CHATHAM COUNTIES THROUGH 345 PM
EDT...

AT 239 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
LIBERTY...OR ABOUT 10 MILES EAST OF RANDLEMAN...MOVING NORTHEAST AT
30 MPH.

SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
ALAMANCE...SWEPSONVILLE...GRAHAM...HAW RIVER...AND MEBANE.

HAZARDS INCLUDE...
PEA SIZE HAIL.
GUSTY WINDS OF 30 TO 40 MPH.
OCCASIONAL LIGHTNING.

IF A THUNDERSTORM MOVES NEARBY OR OVERHEAD...SEEK SAFE SHELTER IN A
NEARLY BUILDING OR VEHICLE. STRONG WINDS ARE CAPABLE OF KNOCKING
DOWN BLOWING AROUND LIGHT OBJECTS LEFT OUTDOORS. BRIEFLY HEAVY RAIN
WILL CAUSE PONDING OF WATER ON ROADS AND POOR VISIBILITY.

&&

LAT...LON 3624 7949 3623 7924 3576 7926 3561 7968
      3582 7987
TIME...MOT...LOC 1839Z 229DEG 27KT 3588 7960

DJF

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 4, 10:13 PM EDTSpecial Weather StatementRAHGranville, Person, Vance, Warren77 min
Aug 4, 10:26 PM EDTSevere Thunderstorm WarningRAHGranville, Halifax, Vance, Warren40 min
Aug 4, 11:03 PM EDTSpecial Weather StatementRAHFranklin, Halifax, Nash57 min
Aug 4, 11:28 PM EDTSpecial Weather StatementRAHDurham, Orange62 min
Aug 4, 11:47 PM EDTAreal Flood AdvisoryRAHHalifax103 min
Aug 5, 12:09 AM EDTSpecial Weather StatementRAHEdgecombe, Nash, Wilson66 min
Aug 5, 12:16 AM EDTSevere Thunderstorm WarningRAHDurham, Wake44 min
Aug 5, 12:38 AM EDTSevere Thunderstorm WarningRAHJohnston, Wake52 min
Aug 5, 12:52 AM EDTSpecial Weather StatementRAHWake38 min
Aug 5, 1:15 AM EDTAreal Flood AdvisoryRAHWake3 hr
Aug 5, 1:16 AM EDTSpecial Weather StatementRAHWayne, Wilson59 min
Aug 5, 1:43 AM EDTSpecial Weather StatementRAHWake62 min
Aug 5, 2:14 AM EDTAreal Flood AdvisoryRAHWake106 min
Aug 5, 2:22 AM EDTSpecial Weather StatementRAHHarnett, Wayne53 min
Aug 5, 2:40 AM EDTSevere Thunderstorm WarningRAHJohnston50 min
Aug 5, 3:24 AM EDTAreal Flood AdvisoryRAHJohnston96 min
Aug 5, 4:15 AM EDTSpecial Weather StatementRAHSampson90 min
Aug 5, 2:22 PM EDTSpecial Weather StatementRAHDavidson, Forsyth, Guilford93 min
Aug 5, 2:40 PM EDTSpecial Weather StatementRAHAlamance65 min
Aug 5, 3:03 PM EDTSevere Thunderstorm WarningRAHAlamance57 min
Aug 5, 4:18 PM EDTSevere Thunderstorm WarningRAHDavidson57 min
Aug 5, 4:22 PM EDTSpecial Weather StatementRAHForsyth53 min
Aug 5, 4:40 PM EDTSpecial Weather StatementRAHAlamance35 min
Aug 5, 4:50 PM EDTSevere Thunderstorm WarningRAHDavidson, Forsyth, Guilford40 min
Aug 5, 5:03 PM EDTSevere Thunderstorm WarningRAHPerson57 min
Aug 5, 5:13 PM EDTSevere Thunderstorm WarningRAHDavidson, Randolph47 min
Aug 5, 5:28 PM EDTSevere Thunderstorm WarningRAHGranville50 min
Aug 5, 5:30 PM EDTSevere Thunderstorm WarningRAHGuilford43 min
Aug 5, 5:45 PM EDTSpecial Weather StatementRAHMontgomery, Randolph, Stanly60 min
Aug 5, 5:47 PM EDTSevere Thunderstorm WarningRAHAlamance, Orange58 min
Aug 5, 6:01 PM EDTSpecial Weather StatementRAHVance59 min
Aug 5, 6:06 PM EDTSevere Thunderstorm WarningRAHAlamance, Orange39 min
Aug 5, 6:40 PM EDTSevere Thunderstorm WarningRAHDurham, Granville, Orange50 min
Aug 5, 6:56 PM EDTSpecial Weather StatementRAHFranklin, Halifax, Nash64 min
Aug 5, 7:13 PM EDTSevere Thunderstorm WarningRAHWake47 min
Aug 5, 7:19 PM EDTSpecial Weather StatementRAHCumberland, Harnett, Hoke, Johnston, Lee, Richmond and 1 more56 min
Aug 5, 7:31 PM EDTSevere Thunderstorm WarningRAHEdgecombe, Halifax, Nash, Wilson59 min
Aug 5, 7:40 PM EDTAreal Flood AdvisoryRAHAnson, Richmond110 min
Aug 5, 7:42 PM EDTAreal Flood AdvisoryRAHWake108 min
Aug 5, 7:47 PM EDTAreal Flood AdvisoryRAHFranklin103 min
Aug 5, 7:54 PM EDTFlash Flood WarningRAHWake111 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2010Every severe thunderstorm warning in 2010

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.