Alert archive / North Carolina / Special Weather Statements in 2012

Special Weather Statement, NWS Raleigh, NC

March 20, 2012Granville County, North Carolina

NWS Raleigh, NC issued this special weather statement at Mar 20, 2012, 9:26 AM EDT for Granville County, North Carolina. It was in force for 64 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 20, 2012, 9:26 AM EDT (13:26 UTC)
Expired: Mar 20, 2012, 10:30 AM EDT
In force: 64 min
Issued by: NWS Raleigh, NC

County Granville County, NC

The radar

The Raleigh/Durham radar (KRAX), 65 km from the middle of the area, began a volume at 13:27 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, 1.4 hours before the alert went out and 121 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: 746 J/kg
Mixed-layer CIN: -85 J/kg
Mixed-layer LCL: 926 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 20, 7:24 AM EDT, 2 hours 2 minutes earlier.

Area forecast discussion, Mar 20, 7:24 AM EDT, 2 hours 2 minutes before

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Hazardous weather outlook, Mar 20, 4:14 AM EDT, 5 hours 12 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RALEIGH NC
414 AM EDT TUE MAR 20 2012

NCZ007>011-021>028-038>043-073>078-083>086-088-089-210930-
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-
414 AM EDT TUE MAR 20 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NORTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

POCKETS OF DENSE FOG ARE POSSIBLE EARLY THIS MORNING ACROSS
CENTRAL NORTH CAROLINA. THE FOG WILL LIFT AND DISSIPATE PRIOR TO 9 AM.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE SATURDAY AND SUNDAY.

In the hours before

Local storm report, Mar 20, 6:36 AM EDT, 2 hours 50 minutes before

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Special weather statement, Mar 20, 6:43 AM EDT, 2 hours 43 minutes before

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Local storm report, Mar 20, 6:58 AM EDT, 2 hours 28 minutes before

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Local storm report, Mar 20, 7:00 AM EDT, 2 hours 26 minutes before

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Special weather statement, Mar 20, 7:08 AM EDT, 2 hours 18 minutes before

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Special weather statement, Mar 20, 9:26 AM EDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 20, 2:33 AM EDT	Special Weather Statement	RAH	Granville, Vance	57 min
Mar 20, 3:04 AM EDT	Special Weather Statement	RAH	Vance	56 min
Mar 20, 4:57 AM EDT	Special Weather Statement	RAH	Durham	63 min
Mar 20, 5:44 AM EDT	Special Weather Statement	RAH	Wake	61 min
Mar 20, 5:59 AM EDT	Special Weather Statement	RAH	Wake	61 min
Mar 20, 6:43 AM EDT	Special Weather Statement	RAH	Harnett, Lee	62 min
Mar 20, 7:08 AM EDT	Special Weather Statement	RAH	Cumberland, Harnett, Hoke, Lee, Moore	52 min
Mar 20, 9:50 AM EDT	Special Weather Statement	RAH	Richmond	55 min
Mar 20, 10:36 AM EDT	Special Weather Statement	RAH	Richmond	54 min
Mar 20, 10:41 AM EDT	Special Weather Statement	RAH	Wake	64 min
Mar 20, 4:04 PM EDT	Special Weather Statement	RAH	Franklin	41 min
Mar 20, 4:51 PM EDT	Severe Thunderstorm Warning	RAH	Franklin, Nash	39 min
Mar 20, 5:03 PM EDT	Special Weather Statement	RAH	Randolph	57 min
Mar 20, 5:32 PM EDT	Special Weather Statement	RAH	Franklin	58 min
Mar 20, 5:58 PM EDT	Severe Thunderstorm Warning	RAH	Franklin, Wake	28 min
Mar 20, 6:36 PM EDT	Special Weather Statement	RAH	Davidson, Forsyth	54 min
Mar 20, 7:04 PM EDT	Special Weather Statement	RAH	Davidson, Forsyth	26 min
Mar 20, 7:13 PM EDT	Areal Flood Advisory	RAH	Davidson, Forsyth, Guilford	3 hr
Mar 20, 7:16 PM EDT	Severe Thunderstorm Warning	RAH	Davidson, Forsyth, Guilford	44 min
Mar 20, 7:39 PM EDT	Flash Flood Warning	RAH	Davidson, Forsyth, Guilford	3 hr

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.