Alert archive / North Carolina / Mesoscale Discussions in 2017

Mesoscale Discussion 1626

September 6, 201728 counties in North Carolina; 9 counties in South Carolina; 8 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Sep 6, 2017, 1:29 PM EDT for 28 counties in North Carolina; 9 counties in South Carolina; 8 counties in Virginia. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Sep 6, 2017, 1:29 PM EDT (17:29 UTC)
Expired: Sep 6, 2017, 4:00 PM EDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 45 counties

Bertie County, NC, Bladen County, NC, Camden County, NC, Chowan County, NC, Cumberland County, NC, Duplin County, NC, Edgecombe County, NC, Gates County, NC, Greene County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hoke County, NC, Johnston County, NC, Lenoir County, NC, Martin County, NC, Nash County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Pitt County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Wake County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Calhoun County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Florence County, SC, Lee County, SC, Marion County, SC, Marlboro County, SC, Sumter County, SC, City of Chesapeake, VA, City of Franklin, VA, City of Hampton, VA, City of Norfolk, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, Isle of Wight County, VA

The radar

The Raleigh/Durham radar (KRAX), 62 km from the middle of the area, began a volume at 17:29 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

Newport, NC (KMHX), launched 12:00Z, 5.5 hours before the alert went out and 167 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: 239 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 1111 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in North Carolina, 2017 Mesoscale Discussions in South Carolina, 2017 Mesoscale Discussions in Virginia, 2017 Every mesoscale discussion in 2017

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.