Alert archive / North Carolina / Special Weather Statements in 2011

Special Weather Statement, NWS Raleigh, NC

July 8, 2011Guilford County, North Carolina

NWS Raleigh, NC issued this special weather statement at Jul 8, 2011, 5:40 PM EDT for Guilford County, North Carolina. It was in force for 50 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 8, 2011, 5:40 PM EDT (21:40 UTC)
Expired
Jul 8, 2011, 6:30 PM EDT
In force
50 min
Issued by
NWS Raleigh, NC

County Guilford County, NC

The radar

The Roanoke radar (KFCX), 124 km from the middle of the area, began a volume at 21:42 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, 9.7 hours before the alert went out and 36 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 2011-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1246 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 2011-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 85 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
1246 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
557 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
85 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.9

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 8, 2:45 PM EDT, 2 hours 55 minutes earlier.

Area forecast discussion, Jul 8, 2:45 PM EDT, 2 hours 55 minutes before
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Hazardous weather outlook, Jul 8, 3:07 PM EDT, 2 hours 33 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE RALEIGH NC
307 PM EDT FRI JUL 8 2011

NCZ007>011-021>028-038>043-073>078-083>086-088-089-091915-
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-
307 PM EDT FRI JUL 8 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NORTH CAROLINA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATE THIS AFTERNOON
INTO TONIGHT. AN APPROACHING UPPER LEVEL TROUGH WILL ENCOUNTER A
VERY MOIST AND UNSTABLE AIRMASS IN PLACE ACROSS CENTRAL NORTH
CAROLINA THIS EVENING THROUGH TONIGHT. A FEW STORMS COULD BECOME
SEVERE...WITH A PRIMARY THREAT OF DAMAGING WINDS. ADDITIONALLY...
LOCALLY HEAVY RAINFALL AND ISOLATED FLASH FLOODING WILL BE
POSSIBLE...PRIMARILY AFTER SUNSET THIS EVENING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

THUNDERSTORMS WILL REMAIN POSSIBLE THROUGH THE DAY SATURDAY...
PRIMARILY SOUTH OF HIGHWAY 64. A FEW STORMS COULD BECOME SEVERE...
WITH A MAIN THREAT OF DAMAGING WINDS.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTERS ARE ENCOURAGED TO REPORT ANY SEVERE OR SIGNIFICANT
WEATHER IMMEDIATELY TO THE NATIONAL WEATHER SERVICE.

VINCENT

In the hours before

Special weather statement, Jul 8, 12:42 PM EDT, 4 hours 58 minutes before
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Special weather statement, Jul 8, 1:37 PM EDT, 4 hours 3 minutes before
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Special weather statement, Jul 8, 1:42 PM EDT, 3 hours 58 minutes before
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Special weather statement, Jul 8, 2:38 PM EDT, 3 hours 2 minutes before
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Special weather statement, Jul 8, 5:09 PM EDT, 31 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
509 PM EDT FRI JUL 8 2011

NCZ021-022-038-082200-
DAVIDSON-FORSYTH-GUILFORD-
509 PM EDT FRI JUL 8 2011

...STRONG THUNDERSTORMS WILL AFFECT DAVIDSON... NORTHEAST FORSYTH...
AND NORTHWEST GUILFORD COUNTIES THROUGH 600 PM...

AT 505 PM EDT...DOPPLER RADAR INDICATED A LINE OF STRONG
THUNDERSTORMS OVER THE YADKIN RIVER ACROSS WESTERN DAVIDSON
COUNTY... AND 15 MILES WEST OF HIGH ROCK... MOVING NORTHEAST AT 30
MPH. ANOTHER STRONG THUNDERSTORM WAS LOCATED 5 MILES NORTHWEST OF
THE PTI AIRPORT IN GUILFORD COUNTY... MOVING NORTHEAST AT 40 MPH.

SOME LOCATIONS AFFECTED BY THESE STORMS INCLUDE...HIGH ROCK...
LEXINGTON...WELCOME...PTI AIRPORT... SUMMERFIELD...

HAZARDS INCLUDE...
GUSTY WINDS OF 30 TO 40 MPH.
VERY HEAVY RAIN FOR 20 TO 30 MINUTES.

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 3585 8048 3583 8046 3586 8042 3585 8039
      3589 8042 3589 8037 3595 8038 3626 7981
      3625 7969 3607 7956 3592 7993 3592 8004
      3586 8005 3572 8041 3573 8044 3579 8049
      3580 8047
TIME...MOT...LOC 2103Z 239DEG 28KT 3583 8038

BADGETT
Special weather statement, Jul 8, 5:40 PM EDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
540 PM EDT FRI JUL 8 2011

NCZ021-022-038-082230-
DAVIDSON-FORSYTH-GUILFORD-
540 PM EDT FRI JUL 8 2011

...STRONG THUNDERSTORMS WILL AFFECT NORTHERN DAVIDSON... EASTERN
FORSYTH AND GUILFORD COUNTIES THROUGH 630 PM...

AT 535 PM EDT...DOPPLER RADAR INDICATED A LINE OF STRONG
THUNDERSTORMS EXTENDING FROM WINSTON-SALEM TO LEXINGTON...  MOVING
NORTHEAST AT 30 MPH. THESE STORMS WILL AFFECT NORTHERN DAVIDSON...
EASTERN FORSYTH... GUILFORD... AND NORTHWEST RANDOLPH COUNTIES. THIS
INCLUDES THOMASVILLE... HIGH POINT... GREENSBORO... ARCHDALE...
LEXINGTON AND FOREST OAKS.

HAZARDS INCLUDE...
GUSTY WINDS OF 40 TO 45 MPH.
VERY HEAVY RAIN FOR 20 TO 30 MINUTES.
FREQUENT LIGHTNING.

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 3585 8048 3583 8046 3586 8042 3585 8039
      3589 8042 3589 8037 3595 8038 3626 7981
      3625 7969 3607 7956 3592 7993 3592 8004
      3586 8005 3572 8041 3573 8044 3579 8049
      3580 8047
TIME...MOT...LOC 2103Z 239DEG 27KT 3583 8038

BADGETT

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 10:43 PM EDTAreal Flood AdvisoryRAHWayne105 min
Jul 8, 12:42 PM EDTSpecial Weather StatementRAHSampson33 min
Jul 8, 1:37 PM EDTSpecial Weather StatementRAHDurham, Orange23 min
Jul 8, 1:42 PM EDTSpecial Weather StatementRAHMontgomery48 min
Jul 8, 2:38 PM EDTSpecial Weather StatementRAHDurham37 min
Jul 8, 2:45 PM EDTAreal Flood AdvisoryRAHDurham75 min
Jul 8, 5:09 PM EDTSpecial Weather StatementRAHGuilford51 min
Jul 8, 7:55 PM EDTSpecial Weather StatementRAHAlamance, Orange, Person50 min

Nearby

Special Weather Statements in North Carolina, 2011Every special weather statement 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.