Alert archive / Virginia / Heat Advisories in 2016

Heat Advisory 1, NWS Blacksburg, VA

July 24, 20164 counties in Virginia

NWS Blacksburg, VA issued this heat advisory at Jul 24, 2016, 2:53 PM EDT for 4 counties in Virginia. It took effect at Jul 25, 2016, 12:00 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jul 24, 2016, 2:53 PM EDT (18:53 UTC)
In effect from: Jul 25, 2016, 12:00 PM EDT
Expired: Jul 25, 2016, 8:00 PM EDT
In force: 8 hr
Issued by: NWS Blacksburg, VA

Counties Appomattox County, VA, Buckingham County, VA, Charlotte County, VA, Halifax County, VA

The radar

The Roanoke radar (KFCX), 138 km from the middle of the area, began a volume at 18:54 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.9 hours before the alert went out and 229 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2153 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -31 m²/s²
0-3 km storm-relative helicity: 103 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 Blacksburg, VA wrote its last area forecast discussion before this heat advisory went out at Jul 24, 1:33 PM EDT, 1 hour 20 minutes earlier.

Area forecast discussion, Jul 24, 1:33 PM EDT, 1 hour 20 minutes before

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Hazardous weather outlook, Jul 24, 3:52 AM EDT, 11 hours 1 minute before

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The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 24, 6:06 PM EDT	Special Weather Statement	RNK	Greenbrier	24 min
Jul 24, 6:34 PM EDT	Special Weather Statement	RNK	Greenbrier	26 min

Nearby

Heat Advisories in Virginia, 2016 Every heat advisory in 2016

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.