Alert archive / North Carolina / Special Weather Statements in 2012

Special Weather Statement, NWS Raleigh, NC

April 18, 2012Wake County, North Carolina

NWS Raleigh, NC issued this special weather statement at Apr 18, 2012, 1:48 AM EDT for Wake County, North Carolina. It was in force for 42 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: Apr 18, 2012, 1:48 AM EDT (05:48 UTC)
Expired: Apr 18, 2012, 2:30 AM EDT
In force: 42 min
Issued by: NWS Raleigh, NC

County Wake County, NC

The radar

The Raleigh/Durham radar (KRAX), 44 km from the middle of the area, began a volume at 05:47 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, 5.8 hours before the alert went out and 100 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: 51 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 2070 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 247 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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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 8:34 PM EDT	Special Weather Statement	RAH	Montgomery, Moore	71 min
Apr 17, 11:15 PM EDT	Special Weather Statement	RAH	Moore	75 min
Apr 18, 1:16 AM EDT	Special Weather Statement	RAH	Randolph	29 min
Apr 18, 1:54 AM EDT	Special Weather Statement	RAH	Randolph	36 min
Apr 18, 2:26 AM EDT	Special Weather Statement	RAH	Alamance	49 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.