Alert archive / North Carolina / Special Weather Statements in 2012

Special Weather Statement, NWS Raleigh, NC

July 22, 2012Alamance County, North Carolina

NWS Raleigh, NC issued this special weather statement at Jul 22, 2012, 12:08 AM EDT for Alamance County, North Carolina. It was in force for 37 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 22, 2012, 12:08 AM EDT (04:08 UTC)
Expired
Jul 22, 2012, 12:45 AM EDT
In force
37 min
Issued by
NWS Raleigh, NC

County Alamance County, NC

The radar

The Raleigh/Durham radar (KRAX), 88 km from the middle of the area, began a volume at 04:07 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 00:00Z, 4.1 hours before the alert went out and 57 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 00:00Z on 2012-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3006 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2012-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 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
3006 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
954 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
48 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Raleigh, NC wrote its last area forecast discussion before this special weather statement went out at Jul 21, 9:55 PM EDT, 2 hours 13 minutes earlier.

Area forecast discussion, Jul 21, 9:55 PM EDT, 2 hours 13 minutes before
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Hazardous weather outlook, Jul 21, 10:55 PM EDT, 1 hour 13 minutes before
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In the hours before

Special weather statement, Jul 21, 9:16 PM EDT, 2 hours 52 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
916 PM EDT SAT JUL 21 2012

NCZ023>025-039>042-076-077-220215-
ALAMANCE-CHATHAM-DURHAM-HARNETT-JOHNSTON-LEE-ORANGE-RANDOLPH-WAKE-
916 PM EDT SAT JUL 21 2012

...STRONG THUNDERSTORMS WILL MOVE ACROSS HARNETT...JOHNSTON...WAKE...
RANDOLPH...ORANGE...LEE...DURHAM...CHATHAM AND ALAMANCE COUNTIES
THROUGH 1015 PM EDT...

AT 914 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS IN BAND
FROM NEAR STALEY TO PITTSBORO TO HOLLY SPRINGS. THESE STORMS WERE
MOVING TO THE EAST-SOUTHEAST AT 15 MPH.

LOCATIONS IN THE PATH OF THESE STORMS INCLUDE PITTSBORO... BYNUM...
JORDAN LAKE... MONCURE... SILER CITY... FUQUAY-VARINA.

HAZARDS INCLUDE...
PEA SIZE HAIL.
GUSTY WINDS OF 30 TO 40 MPH.
AN EXCESSIVE AMOUNT OF DEADLY CLOUD TO GROUND LIGHTNING.
HEAVY RAINFALL AND MINOR FLOODING.

THIS INCLUDES INTERSTATE 40 BETWEEN EXITS 281 AND 319... INTERSTATE
540... INTERSTATE 440... AND HIGHWAY 64.

SEEK SHELTER IN A NEARBY BUILDING OR VEHICLE. STRONG WINDS ARE
CAPABLE OF KNOCKING DOWN SMALL TREES AND TREE LIMBS.

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.

&&

LAT...LON 3588 7829 3587 7828 3545 7844 3547 7877
      3553 7962 3589 7963
TIME...MOT...LOC 0114Z 290DEG 14KT 3577 7929

GIH
Special weather statement, Jul 21, 9:45 PM EDT, 2 hours 23 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
945 PM EDT SAT JUL 21 2012

NCZ024-220230-
ORANGE-
945 PM EDT SAT JUL 21 2012

...A STRONG THUNDERSTORM WILL MOVE ACROSS ORANGE COUNTY THROUGH 1030
PM EDT...

AT 945 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
EFLAND...OR ABOUT 6 MILES WEST OF HILLSBOROUGH...MOVING EAST AT 10
MPH.

SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...EFLAND...
HILLSBOROUGH.

HAZARDS INCLUDE...
PEA SIZE HAIL.
GUSTY WINDS OF 30 TO 40 MPH.
DEADLY CLOUD TO GROUND LIGHTNING.

THIS INCLUDES INTERSTATE 40 BETWEEN EXITS 157 AND 266.

THIS INCLUDES INTERSTATE 85 BETWEEN EXITS 164 AND 170.

SEEK SHELTER IN A NEARBY BUILDING OR VEHICLE. STRONG WINDS ARE
CAPABLE OF KNOCKING DOWN SMALL TREES AND BLOWING AROUND TRASH CANS...
POTTED PLANTS...LAWN FURNITURE AND OTHER LIGHT OUTDOOR OBJECTS.

&&

LAT...LON 3622 7896 3590 7902 3597 7926 3599 7927
      3620 7926
TIME...MOT...LOC 0145Z 284DEG 9KT 3608 7920

GIH
Local storm report, Jul 21, 9:48 PM EDT, 2 hours 20 minutes before
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Local storm report, Jul 21, 9:51 PM EDT, 2 hours 17 minutes before
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Local storm report, Jul 21, 10:54 PM EDT, 1 hour 14 minutes before
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Special weather statement, Jul 22, 12:08 AM EDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 8:34 PM EDTSpecial Weather StatementRAHRandolph41 min
Jul 21, 8:40 PM EDTAreal Flood AdvisoryRAHRandolph52 min
Jul 21, 8:47 PM EDTAreal Flood AdvisoryRAHWake44 min
Jul 21, 8:51 PM EDTSevere Thunderstorm WarningRAHDavidson, Randolph24 min
Jul 21, 9:16 PM EDTSpecial Weather StatementRAHChatham, Wake59 min
Jul 21, 9:45 PM EDTSpecial Weather StatementRAHOrange45 min
Jul 22, 12:43 AM EDTAreal Flood AdvisoryRAHAlamance, Orange107 min
Jul 22, 12:50 AM EDTSpecial Weather StatementRAHAlamance, Orange40 min
Jul 22, 2:22 AM EDTSpecial Weather StatementRAHWilson38 min
Jul 22, 3:03 AM EDTSpecial Weather StatementRAHWayne42 min
Jul 22, 3:16 AM EDTAreal Flood AdvisoryRAHJohnston, Wayne, Wilson2 hr
Jul 22, 3:27 AM EDTSpecial Weather StatementRAHWake63 min
Jul 22, 3:51 AM EDTAreal Flood AdvisoryRAHWake100 min
Jul 22, 4:26 AM EDTSpecial Weather StatementRAHWake49 min
Jul 22, 4:43 AM EDTSpecial Weather StatementRAHFranklin47 min
Jul 22, 1:56 PM EDTSpecial Weather StatementRAHCumberland64 min
Jul 22, 2:58 PM EDTSpecial Weather StatementRAHCumberland62 min
Jul 22, 3:09 PM EDTSpecial Weather StatementRAHAnson66 min
Jul 22, 3:24 PM EDTSpecial Weather StatementRAHAnson, Hoke, Montgomery, Moore, Richmond, Scotland and 1 more66 min
Jul 22, 3:28 PM EDTSevere Thunderstorm WarningRAHJohnston, Sampson, Wayne32 min
Jul 22, 3:47 PM EDTSpecial Weather StatementRAHGuilford58 min
Jul 22, 4:46 PM EDTAreal Flood AdvisoryRAHCumberland, Harnett, Hoke, Moore86 min
Jul 22, 4:58 PM EDTSpecial Weather StatementRAHMontgomery62 min
Jul 22, 5:00 PM EDTSpecial Weather StatementRAHCumberland60 min
Jul 22, 5:25 PM EDTSevere Thunderstorm WarningRAHHoke, Moore50 min
Jul 22, 5:45 PM EDTSpecial Weather StatementRAHSampson60 min
Jul 22, 6:17 PM EDTSpecial Weather StatementRAHHoke58 min
Jul 22, 6:39 PM EDTSpecial Weather StatementRAHWake66 min
Jul 22, 6:53 PM EDTSpecial Weather StatementRAHJohnston67 min
Jul 22, 7:32 PM EDTSevere Thunderstorm WarningRAHJohnston, Wake30 min

Nearby

Special Weather Statements in North Carolina, 2012Every special weather statement in 2012

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.