Alert archive / North Carolina / Heat Advisories in 2017

Heat Advisory 6, NWS Raleigh, NC

July 21, 201729 counties in North Carolina

NWS Raleigh, NC issued this heat advisory at Jul 21, 2017, 3:03 PM EDT for 29 counties in North Carolina. It took effect at Jul 22, 2017, 11:00 AM EDT. It was in force for 32 hr.

The area

The counties it named.

The facts

Issued: Jul 21, 2017, 3:03 PM EDT (19:03 UTC)
In effect from: Jul 22, 2017, 11:00 AM EDT
Expired: Jul 23, 2017, 7:00 PM EDT
In force: 32 hr
Issued by: NWS Raleigh, NC

All 29 counties

Alamance County, NC, Anson County, NC, Chatham County, NC, Davidson County, NC, Durham County, NC, Edgecombe County, NC, Forsyth County, NC, Franklin County, NC, Granville County, NC, Guilford County, NC, Halifax County, NC, Harnett County, NC, Hoke County, NC, Johnston County, NC, Lee County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Richmond County, NC, Sampson County, NC, Scotland County, NC, Stanly County, NC, Vance County, NC, Warren County, NC, Wayne County, NC, Wilson County, NC

The radar

The Raleigh/Durham radar (KRAX), 47 km from the middle of the area, began a volume at 19:03 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

Roanoke, VA (KRNK), launched 12:00Z, 7.1 hours before the alert went out and 172 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: 10 J/kg
Mixed-layer CIN: -139 J/kg
Mixed-layer LCL: 1063 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Jul 21, 2:25 PM EDT, 38 minutes earlier.

Area forecast discussion, Jul 21, 2:25 PM EDT, 38 minutes before

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Hazardous weather outlook, Jul 21, 12:01 PM EDT, 3 hours 2 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
Jul 20, 9:27 PM EDT	Heat Advisory	RAH	Chatham, Cumberland, Durham, Edgecombe, Franklin, Halifax and 13 more	23 hr
Jul 21, 3:03 PM EDT	Excessive Heat Watch	RAH	Cumberland, Wake	24 hr
Jul 21, 4:09 PM EDT	Special Weather Statement	RAH	Edgecombe, Halifax, Johnston, Nash, Wilson	66 min
Jul 21, 4:11 PM EDT	Special Weather Statement	RAH	Cumberland	64 min
Jul 21, 4:42 PM EDT	Areal Flood Advisory	RAH	Cumberland	3 hr
Jul 21, 5:36 PM EDT	Special Weather Statement	RAH	Johnston, Wilson	54 min
Jul 21, 5:50 PM EDT	Special Weather Statement	RAH	Scotland	40 min
Jul 21, 6:09 PM EDT	Special Weather Statement	RAH	Person	66 min
Jul 21, 6:12 PM EDT	Areal Flood Advisory	RAH	Hoke	3 hr

Nearby

Heat Advisories in North Carolina, 2017 Every heat advisory 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.