Alert archive / Virginia / Frost Advisories in 2016

Frost Advisory 9, NWS Baltimore/Washington

October 24, 20166 counties in Virginia; Grant County, Hardy County, West Virginia

NWS Baltimore/Washington issued this frost advisory at Oct 24, 2016, 11:50 AM EDT for 6 counties in Virginia; Grant County, Hardy County, West Virginia. It took effect at Oct 25, 2016, 3:00 AM EDT. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued: Oct 24, 2016, 11:50 AM EDT (15:50 UTC)
In effect from: Oct 25, 2016, 3:00 AM EDT
Expired: Oct 25, 2016, 8:28 AM EDT
In force: 5 hr
Issued by: NWS Baltimore/Washington

Counties City of Harrisonburg, VA, City of Staunton, VA, City of Waynesboro, VA, Page County, VA, Rockingham County, VA, Shenandoah County, VA, Grant County, WV, Hardy County, WV

The radar

The Sterling radar (KLWX), 125 km from the middle of the area, began a volume at 15:49 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, 3.8 hours before the alert went out and 165 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: 1277 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 113 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 frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Baltimore/Washington wrote its last area forecast discussion before this frost advisory went out at Oct 24, 10:51 AM EDT, 59 minutes earlier.

Area forecast discussion, Oct 24, 10:51 AM EDT, 59 minutes before

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Hazardous weather outlook, Oct 24, 7:08 AM EDT, 4 hours 42 minutes before

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In the hours before

Local storm report, Oct 24, 9:18 AM EDT, 2 hours 32 minutes before

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The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 24, 2:57 AM EDT	Wind Advisory	LWX	Albemarle, Amherst, Augusta, Greene, Highland, Madison and 6 more	4 hr
Oct 24, 11:50 AM EDT	Freeze Warning	LWX	Highland	21 hr
Oct 24, 4:44 PM EDT	Freeze Watch	LWX	Clarke, Frederick, Highland, Page, Rockingham, Shenandoah and 3 more	21 hr

Nearby

Frost Advisories in Virginia, 2016 Frost Advisories in West Virginia, 2016 Every frost 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.