Alert archive / North Carolina / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 108, NWS Raleigh, NC

August 5, 2005Orange County, North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at Aug 5, 2005, 5:18 PM EDT for Orange County, North Carolina. It was in force for 27 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, 2005, 5:18 PM EDT (21:18 UTC)
Expired
Aug 5, 2005, 5:45 PM EDT
In force
27 min
Issued by
NWS Raleigh, NC
Area
Counties, with a storm outline in the text

County Orange County, NC

The radar

The Raleigh/Durham radar (KRAX), 72 km from the middle of the area, began a volume at 21:19 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, 9.3 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 2005-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1463 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 2005-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 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
1463 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
1227 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
-9 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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, 2:45 PM EDT, 2 hours 33 minutes earlier.

Area forecast discussion, Aug 5, 2:45 PM EDT, 2 hours 33 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RALEIGH NC
245 PM EDT FRI AUG 5 2005

.SHORT TERM (TONIGHT THROUGH MONDAY)...

THROUGH TONIGHT: ISOLATED TO SCATTERED STORMS THAT FORMED WITHIN
VERY WEAK LOW LEVEL CONVERGENCE ZONES SHOULD DIMINISH IN COVERAGE
AND INTENSITY SHORTLY AFTER SUNSET. WILL CONTINUE 20-30% POPS
THROUGH MID EVENING... THEN WILL CLEAR OUT SKIES BRIEFLY BEFORE
PATCHY STRATUS AND FOG ARE EXPECTED TO DEVELOP... AS SUGGESTED BY
FORECAST SOUNDINGS AND PERSISTENCE. FORECAST LOWS OF 69-73
REASONABLE.

SAT-MON: OVERALL PATTERN IS FAIRLY STAGNANT THROUGH THIS PERIOD WITH
A BAGGY UPPER LOW OVER THE GULF COAST REGION DRIFTING SLOWLY
WESTWARD... & THE PREVAILING WESTERLIES HOLDING WELL TO OUR NORTH...
KEEPING NC BENEATH A WEAK UPPER LEVEL SHEAR AXIS & AT THE MERCY OF
HARD-TO-DETECT LOW LEVEL FORCING FEATURES TO FOCUS CONVECTION WITH
DAYTIME DESTABILIZATION. THE SURFACE FRONT APPROACHING FROM THE
NORTHWEST SHOULD STALL TO OUR NORTH EARLY IN THE WEEKEND BEFORE
WASHING OUT. OFFSHORE ANTICYCLONE SHOULD PRODUCE A PREVAILING
SOUTHEAST TO SOUTH WIND FLOW THROUGH THE LOW LEVELS... CAUSING A
SLIGHT UPTICK IN MOISTURE THROUGH THE COLUMN AS WIND FIELDS ALOFT
REMAIN WEAK. IN GENERAL... SEE NO REASON TO DEPART FROM THE
PERSISTENCE OF THE LAST TWO DAYS WITH SMALL (1 IN 4) CHANCES OF
SHOWERS AND STORMS PRIMARILY EACH AFTERNOON AND EVENING. WE SHOULD
SEE AREAS OF FOG AND STRATUS AGAIN SAT NIGHT. ONLY MINOR CHANGES ARE
NEEDED TO FORECAST MAX/MIN TEMPS WITH INCREASED CLOUD COVER
PROGRESSIVELY TRIMMING HIGHS A BIT EACH DAY.

&&

.LONG TERM (TUESDAY THROUGH FRIDAY)...

CONFLUENCE ZONE BETWEEN BERMUDA HIGH JUST OFF THE MID-ATLANTIC COAST
AND UPPER CYCLONIC CIRCULATION OVER THE LOWER MISSISSIPPI WILL
PROVIDE AN INFLUX OF GULF MOISTURE INTO REGION. PWS WATER REMAIN
AOA 2.0 AS THE CYCLONIC CIRCULATION CENTER LIFTS SLOWLY NORTH IN
THE TN VALLEY IN RESPONSE TO PASSING NORTHERN STREAM S/W TROUGH. A
DIURNAL LOW CHANCE TREND IN POPS WILL BE FEATURED THROUGH THE
PERIOD. HOWEVER...IF THE S/W TROUGH ACTUALLY LIFTS NORTH ACROSS THE
CENTRAL APPALACHIANS  HIGH CHANCE POPS TO LIKELY WILL BE JUSTIFIED
BY MID-WEEK. CLOUD COVER AND RAIN CHANCES WILL MITIGATE MAXIMUM
TEMPERATURES TO NORMAL RANGES WITH LOWS 70-75.

&&

.AVIATION...

ISOLATED TO SCATTERED THUNDER THIS EVENING ACROSS TAF FORECAST AREA
THROUGH 00Z. DEVELOPMENT OF SE LOW-LEVEL MARINE LAYER MAY INTRODUCE
IFR/LIFR CEILINGS TO GO ALONG WITH THE MVFR VISIBILITIES THAT HAVE
OBSERVED THE PAST SEVERAL MORNINGS. SCATTERED THUNDER AGAIN TOMORROW
AFTERNOON WITH AFTERNOON HEATING AND PRE-FRONTAL TROUGH.

&&

.RAH WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

SHORT TERM...HARTFIELD
LONG TERM/AVIATION...LOCKLEAR
Hazardous weather outlook, Aug 5, 5:30 AM EDT, 11 hours 48 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RALEIGH NC
530 AM EDT FRI AUG 5 2005

NCZ007>011-021>028-038>043-073>078-083>086-088-089-060930-
PERSON-GRANVILLE-VANCE-WARREN-HALIFAX-FORSYTH-GUILFORD-ALAMANCE-
ORANGE-DURHAM-FRANKLIN-NASH-EDGECOMBE-DAVIDSON-RANDOLPH-CHATHAM-
WAKE-JOHNSTON-WILSON-STANLY-MONTGOMERY-MOORE-LEE-HARNETT-WAYNE-
ANSON-RICHMOND-SCOTLAND-HOKE-CUMBERLAND-SAMPSON-
530 AM EDT FRI AUG 5 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL NORTH
CAROLINA.

.DAY ONE...TODAY AND TONIGHT

LATE AFTERNOON THUNDERSTORMS WILL DEVELOP TODAY. SOME HAIL IS
EXPECTED AND WILL APPROACH SEVERE LIMITS IN ISOLATED LOCATIONS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Special weather statement, Aug 5, 1:22 PM EDT, 3 hours 56 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
122 PM EDT FRI AUG 5 2005

NCZ041-051830-
WAKE-
INCLUDING THE CITY OF...RALEIGH
122 PM EDT FRI AUG 5 2005

STRONG STORMS WILL CONTINUE TO DEVELOP OVER NORTH AND WEST
RALEIGH AND CARY THROUGH 215 PM. FREQUENT LIGHTNING AND VERY HEAVY
RAINFALL CAN BE EXPECTED WITH THIS STORM... SO ANYONE OUTDOORS
SHOULD MOVE INTO A SAFE SHELTER IMMEDIATELY. REMEMBER THAT IF YOU
CAN HEAR THUNDER... YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING. HAIL UP TO THE SIZE OF MARBLES AND WIND GUSTS OVER 35
MPH ARE POSSIBLE WITH THESE STORMS.

GIH
Special weather statement, Aug 5, 4:15 PM EDT, 1 hour 3 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
415 PM EDT FRI AUG 5 2005

NCZ073-083>086-052115-
ANSON-HOKE-RICHMOND-SCOTLAND-STANLY-MOORE
415 PM EDT FRI AUG 5 2005

...STRONG THUNDERSTORMS WILL MOVE SOUTH AT 10 MPH ACROSS
RICHMOND...STANLY...ANSON... MOORE...HOKE AND SCOTLAND COUNTIES
THROUGH 515 PM EDT...

AT 415 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS OVER
PORTIONS OF THE WESTERN SANDHILLS AND THE SOUTHERN PIEDMONT OF NORTH
CAROLINA.  THE STRONGEST STORM WILL MOVE FROM NEAR MASTON SOUTH
ALONG STATE ROUTE 177 AND U.S. HIGHWAY 1 TO NEAR HAMLET AND
ROCKINGHAM IN RICHMOND COUNTY... THROUGH 500 PM.

GUSTY WINDS OF 30 TO 40 MPH... HAIL UP TO THE SIZE OF MARBLES... AND
INTENSE CLOUD-TO-GROUND LIGHTNING CAN BE EXPECTED WITH THESE
THUNDERSTORMS.

MWS
Special weather statement, Aug 5, 4:51 PM EDT, 27 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
451 PM EDT FRI AUG 5 2005

NCZ024-052145-
ORANGE-
451 PM EDT FRI AUG 5 2005

...STRONG THUNDERSTORM WILL MOVE ACROSS ORANGE COUNTY THROUGH 545 PM
EDT...

AT 451 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
INTERSTATE 85 IN EXTREME EASTERN ORANGE COUNTY... ABOUT 9 MILES
NORTH OF CHAPEL HILL.

THE STORM WILL DRIFT SOUTH SOUTHWEST AROUND 10 MPH... AND WILL MOVE
ACROSS INTERSTATE 40 EAST OF HILLSBOROUGH... BETWEEN 510 AND 530 PM.

GUSTY WINDS TO 40 MPH... INTENSE CLOUD-TO-GROUND LIGHTNING... AND
HAIL UP TO THE SIZE OF MARBLES CAN BE EXPECTED WITH THIS STORM.

MWS
Local storm report, Aug 5, 5:18 PM EDT, 0 minutes before
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Nearby

Severe Thunderstorm Warnings in North Carolina, 2005Every severe thunderstorm warning in 2005

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.