Alert archive / Virginia / Special Weather Statements in 2012

Special Weather Statement, NWS Blacksburg, VA

July 4, 2012City of Roanoke, Virginia

NWS Blacksburg, VA issued this special weather statement at Jul 4, 2012, 5:48 PM EDT for City of Roanoke, Virginia. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 4, 2012, 5:48 PM EDT (21:48 UTC)
Expired: Jul 4, 2012, 6:45 PM EDT
In force: 57 min
Issued by: NWS Blacksburg, VA

County City of Roanoke, VA

The radar

The Roanoke radar (KFCX), 45 km from the middle of the area, began a volume at 21:49 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, 9.8 hours before the alert went out and 29 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: 421 J/kg
Mixed-layer CIN: -112 J/kg
Mixed-layer LCL: 1270 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 4, 4:21 PM EDT, 1 hour 27 minutes earlier.

Area forecast discussion, Jul 4, 4:21 PM EDT, 1 hour 27 minutes before

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Hazardous weather outlook, Jul 4, 4:00 PM EDT, 1 hour 48 minutes before

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In the hours before

Local storm report, Jul 4, 1:49 PM EDT, 3 hours 59 minutes before

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Local storm report, Jul 4, 1:54 PM EDT, 3 hours 54 minutes before

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Special weather statement, Jul 4, 4:42 PM EDT, 1 hour 6 minutes before

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Special weather statement, Jul 4, 4:52 PM EDT, 56 minutes before

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Special weather statement, Jul 4, 5:29 PM EDT, 19 minutes before

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Special weather statement, Jul 4, 5:48 PM EDT, 0 minutes 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 4, 4:42 PM EDT	Special Weather Statement	RNK	Botetourt	63 min
Jul 4, 6:30 PM EDT	Special Weather Statement	RNK	Buckingham	45 min
Jul 4, 6:51 PM EDT	Special Weather Statement	RNK	Franklin	54 min
Jul 4, 6:58 PM EDT	Severe Thunderstorm Warning	RNK	Franklin	62 min
Jul 4, 7:06 PM EDT	Severe Thunderstorm Warning	RNK	Roanoke, City of Roanoke	31 min
Jul 4, 7:09 PM EDT	Special Weather Statement	RNK	Buckingham	66 min
Jul 4, 7:24 PM EDT	Special Weather Statement	RNK	Wythe	66 min
Jul 4, 4:52 PM EDT	Special Weather Statement	RNK	Caldwell	53 min
Jul 4, 5:29 PM EDT	Special Weather Statement	RNK	Wilkes	61 min
Jul 4, 6:35 PM EDT	Special Weather Statement	RNK	Alleghany	40 min
Jul 3, 8:00 PM EDT	Special Weather Statement	RNK	Summers	30 min

Nearby

Special Weather Statements in Virginia, 2012 Every special weather statement 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.