Alert archive / North Carolina / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 331, NWS Raleigh, NC

August 19, 20124 counties in North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at Aug 19, 2012, 8:55 AM EDT for 4 counties in North Carolina. It was in force for 65 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
Aug 19, 2012, 8:55 AM EDT (12:55 UTC)
Expired
Aug 19, 2012, 10:00 AM EDT
In force
65 min
Issued by
NWS Raleigh, NC
Area
Storm-based polygon

Counties Franklin County, NC, Halifax County, NC, Nash County, NC, Warren County, NC

The radar

The Raleigh/Durham radar (KRAX), 71 km from the middle of the area, began a volume at 12:58 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, 0.9 hours before the alert went out and 162 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 2012-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 303 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 2012-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 square meters per square second.19395878Sfc1 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
303 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
598 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
72 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.

787 
WUUS52 KRAH 191255
SVRRAH
NCC069-083-127-185-191400-
/O.NEW.KRAH.SV.W.0331.120819T1255Z-120819T1400Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
855 AM EDT SUN AUG 19 2012

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN FRANKLIN COUNTY IN CENTRAL NORTH CAROLINA
  WEST CENTRAL HALIFAX COUNTY IN CENTRAL NORTH CAROLINA
  SOUTHERN WARREN COUNTY IN CENTRAL NORTH CAROLINA
  NORTH CENTRAL NASH COUNTY IN CENTRAL NORTH CAROLINA

* UNTIL 1000 AM EDT

* AT 854 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER INGLESIDE...OR 5 MILES NORTHEAST OF
  LOUISBURG...MOVING EAST AT 25 MPH. QUARTER SIZED HAIL AND WINDS IN
  EXCESS OF 58 MPH ARE LIKELY WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  CENTERVILLE...
  CASTALIA...
  AVENTON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN RALEIGH.

&&

LAT...LON 3640 7798 3610 7786 3603 7830 3620 7839
TIME...MOT...LOC 1255Z 259DEG 23KT 3615 7822

$$

23
2 follow-up statements
286 
WWUS52 KRAH 191319
SVSRAH

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
919 AM EDT SUN AUG 19 2012

NCC069-083-127-185-191400-
/O.CON.KRAH.SV.W.0331.000000T0000Z-120819T1400Z/
FRANKLIN NC-HALIFAX NC-WARREN NC-NASH NC-
919 AM EDT SUN AUG 19 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 AM EDT
FOR NORTH CENTRAL NASH...SOUTHERN WARREN...WEST CENTRAL HALIFAX AND
NORTHEASTERN FRANKLIN COUNTIES...

AT 916 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM.  THIS STORM WAS LOCATED NEAR
CENTERVILLE...OR 14 MILES EAST OF LOUISBURG...MOVING EAST AT 25 MPH.

HAZARDS IN THE WARNING INCLUDE...
QUARTER SIZED HAIL.
DAMAGING WINDS IN EXCESS OF 58 MPH.

LOCATIONS IN THE PATH OF THE STORM INCLUDE... AVENTON AND ARCOLA.

IF YOU OBSERVED DAMAGING WINDS OR LARGE HAIL...PLEASE NOTIFY YOUR
NEAREST LAW ENFORCEMENT AGENCY AND ASK THEM TO RELAY YOUR REPORT TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN RALEIGH.

LAT...LON 3626 7824 3640 7798 3610 7786 3605 7819
TIME...MOT...LOC 1319Z 259DEG 23KT 3618 7803

$$

23
132 
WWUS52 KRAH 191351
SVSRAH

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
951 AM EDT SUN AUG 19 2012

NCC069-083-127-185-191401-
/O.EXP.KRAH.SV.W.0331.000000T0000Z-120819T1400Z/
FRANKLIN NC-HALIFAX NC-WARREN NC-NASH NC-
951 AM EDT SUN AUG 19 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL NASH...SOUTHERN
WARREN...WEST CENTRAL HALIFAX AND NORTHEASTERN FRANKLIN COUNTIES
EXPIRES AT 1000 AM EDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA AND 
THE WARNING WILL BE ALLOWED TO EXPIRE.

IF YOU OBSERVED SEVERE WEATHER INCLUDING DAMAGING WINDS OR LARGE
HAIL...PLEASE CONTACT THE NATIONAL WEATHER SERVICE BY CALLING TOLL
FREE 1...8 7 7...6 3 3...6 7 7 2...OR NOTIFY YOUR NEAREST LAW
ENFORCEMENT AGENCY AND ASK THEM TO RELAY YOUR REPORT TO THE NATIONAL
WEATHER SERVICE FORECAST OFFICE IN RALEIGH.

LAT...LON 3626 7824 3640 7798 3610 7786 3605 7819
TIME...MOT...LOC 1351Z 259DEG 23KT 3622 7778

$$

23

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 8:34 PM EDTSpecial Weather StatementRAHWayne11 min
Aug 19, 4:26 AM EDTSpecial Weather StatementRAHAlamance, Chatham, Durham, Franklin, Granville, Guilford and 6 more2 hr
Aug 19, 4:49 AM EDTAreal Flood AdvisoryRAHAlamance, Guilford, Orange, Randolph3 hr
Aug 19, 6:04 AM EDTSpecial Weather StatementRAHAlamance, Chatham, Durham, Franklin, Granville, Guilford and 6 more116 min
Aug 19, 6:58 AM EDTSpecial Weather StatementRAHChatham, Durham, Franklin, Granville, Orange, Person and 2 more92 min
Aug 19, 7:37 AM EDTAreal Flood AdvisoryRAHGuilford4 hr
Aug 19, 7:40 AM EDTSpecial Weather StatementRAHAnson, Montgomery, Richmond, Stanly65 min
Aug 19, 8:03 AM EDTFlash Flood WarningRAHDurham50 min
Aug 19, 8:24 AM EDTSpecial Weather StatementRAHFranklin, Nash, Vance, Warren51 min
Aug 19, 8:47 AM EDTSpecial Weather StatementRAHAnson, Richmond, Scotland58 min
Aug 19, 9:05 AM EDTSevere Thunderstorm WarningRAHHalifax, Warren40 min
Aug 19, 9:09 AM EDTTornado WarningRAHHalifax23 min
Aug 19, 9:20 AM EDTAreal Flood AdvisoryRAHHalifax, Vance, Warren3 hr
Aug 19, 9:25 AM EDTSpecial Weather StatementRAHMontgomery, Moore65 min
Aug 19, 9:41 AM EDTFlash Flood WarningRAHHalifax, Warren2 hr
Aug 19, 9:47 AM EDTSpecial Weather StatementRAHHoke, Richmond, Scotland58 min
Aug 19, 9:47 AM EDTSevere Thunderstorm WarningRAHEdgecombe, Halifax, Nash58 min
Aug 19, 10:28 AM EDTSpecial Weather StatementRAHCumberland, Harnett, Hoke, Lee, Moore62 min
Aug 19, 11:22 AM EDTFlash Flood WarningRAHHalifax, Warren2 hr
Aug 19, 11:26 AM EDTSpecial Weather StatementRAHCumberland, Harnett, Sampson64 min
Aug 19, 11:35 AM EDTAreal Flood AdvisoryRAHWake78 min
Aug 19, 12:26 PM EDTSpecial Weather StatementRAHSampson, Wayne64 min
Aug 19, 7:14 PM EDTSpecial Weather StatementRAHSampson46 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2012Every severe thunderstorm warning 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.