Alert archive / North Carolina / Mesoscale Discussions in 2012

Mesoscale Discussion 1790

August 19, 201216 counties in North Carolina

The Storm Prediction Center issued this mesoscale discussion at Aug 19, 2012, 1:38 PM EDT for 16 counties in North Carolina. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Aug 19, 2012, 1:38 PM EDT (17:38 UTC)
Expired: Aug 19, 2012, 3:15 PM EDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Beaufort County, NC, Brunswick County, NC, Camden County, NC, Carteret County, NC, Craven County, NC, Currituck County, NC, Dare County, NC, Hyde County, NC, Jones County, NC, New Hanover County, NC, Onslow County, NC, Pamlico County, NC, Pasquotank County, NC, Pender County, NC, Tyrrell County, NC, Washington County, NC

The radar

The Morehead City radar (KMHX), 32 km from the middle of the area, began a volume at 17:41 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

Newport, NC (KMHX), launched 12:00Z, 5.6 hours before the alert went out and 32 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: 1089 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 821 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 19, 9:53 AM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 25 more	97 min
Aug 19, 10:33 AM EDT	Severe Thunderstorm Watch	SPC	Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 29 more	7 hr

Nearby

Mesoscale Discussions in North Carolina, 2012 Every mesoscale discussion 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.