Alert archive / North Carolina / Special Weather Statements in 2012

Special Weather Statement, NWS Raleigh, NC

March 31, 2012Wake County, North Carolina

NWS Raleigh, NC issued this special weather statement at Mar 31, 2012, 8:26 PM EDT for Wake County, North Carolina. It was in force for 34 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: Mar 31, 2012, 8:26 PM EDT (00:26 UTC)
Expired: Mar 31, 2012, 9:00 PM EDT
In force: 34 min
Issued by: NWS Raleigh, NC

County Wake County, NC

The radar

The Raleigh/Durham radar (KRAX), 20 km from the middle of the area, began a volume at 00:29 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, 0.4 hours before the alert went out and 116 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 372 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 1795 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -39 m²/s²
0-3 km storm-relative helicity: -33 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.8

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 Mar 31, 7:25 PM EDT, 1 hour 1 minute earlier.

Area forecast discussion, Mar 31, 7:25 PM EDT, 1 hour 1 minute before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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Hazardous weather outlook, Mar 31, 5:40 AM EDT, 14 hours 46 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RALEIGH NC
540 AM EDT SAT MAR 31 2012

NCZ007>011-021>028-038>043-073>078-083>086-088-089-011130-
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-
540 AM EDT SAT MAR 31 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NORTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

THE APPROACH OF AN UPPER LEVEL TROUGH AND ASSOCIATED COLD FRONT
WILL RESULT IN A CHANCE OF THUNDERSTORMS THIS AFTERNOON AND
EVENING. IF STORMS DEVELOP...SOME MAY BECOME STRONG TO
SEVERE...WITH A PRIMARY THREAT OF HAIL...AND A LESSER THREAT OF
DAMAGING WIND GUSTS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

MWS

In the hours before

Special weather statement, Mar 31, 8:26 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
826 PM EDT SAT MAR 31 2012

NCZ041-010100-
WAKE-
826 PM EDT SAT MAR 31 2012

...A THUNDERSTORM WITH BRIEF HEAVY DOWNPOURS WILL MOVE ACROSS
PORTIONS OF WAKE COUNTY THROUGH 900 PM EDT...

AT 823 PM EDT...DOPPLER RADAR INDICATED A THUNDERSTORM OVER
APEX...OR ABOUT OVER CARY...MOVING SOUTHEAST AT 20 MPH.

SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...HOLLY SPRINGS...LAKE
WHEELER...GARNER.

HAZARDS INCLUDE...
BRIEF HEAVY DOWNPOURS WITH MINOR PONDING OR FLOODING.
PEA SIZE HAIL.
GUSTY WINDS OF 30 TO 40 MPH.

FOR YOUR SAFETY...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 3571 7849 3555 7869 3570 7896 3583 7888
TIME...MOT...LOC 0023Z 304DEG 17KT 3574 7884

NP

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 31, 8:33 PM EDT	Special Weather Statement	RAH	Anson	27 min
Mar 31, 9:01 PM EDT	Special Weather Statement	RAH	Halifax	44 min
Mar 31, 10:34 PM EDT	Special Weather Statement	RAH	Edgecombe, Halifax, Nash	41 min
Mar 31, 10:41 PM EDT	Special Weather Statement	RAH	Alamance, Orange	34 min
Mar 31, 11:11 PM EDT	Special Weather Statement	RAH	Orange, Wake	64 min
Mar 31, 11:37 PM EDT	Severe Thunderstorm Warning	RAH	Chatham, Durham, Wake	38 min
Mar 31, 11:58 PM EDT	Severe Thunderstorm Warning	RAH	Wake	37 min
Apr 1, 12:32 AM EDT	Special Weather Statement	RAH	Johnston	58 min
Apr 1, 1:52 AM EDT	Special Weather Statement	RAH	Wayne	23 min

Nearby

Special Weather Statements in North Carolina, 2012 Every 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.