Alert archive / Virginia / Special Weather Statements in 2018

Special Weather Statement, NWS Blacksburg, VA

August 7, 2018City of Roanoke, City of Salem, Virginia

NWS Blacksburg, VA issued this special weather statement at Aug 7, 2018, 3:25 PM EDT for City of Roanoke, City of Salem, Virginia. It was in force for 50 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: Aug 7, 2018, 3:25 PM EDT (19:25 UTC)
Expired: Aug 7, 2018, 4:15 PM EDT
In force: 50 min
Issued by: NWS Blacksburg, VA

Counties City of Roanoke, VA, City of Salem, VA

The radar

The Roanoke radar (KFCX), 44 km from the middle of the area, began a volume at 19:28 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, 7.4 hours before the alert went out and 37 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: 562 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 750 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -69 m²/s²
0-3 km storm-relative helicity: -32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

796 
WWUS81 KRNK 071925
SPSRNK

Special Weather Statement
National Weather Service BLACKSBURG VA
325 PM EDT TUE AUG 7 2018

VAZ022-023-072015-
Botetourt-Roanoke-
325 PM EDT TUE AUG 7 2018

...A STRONG THUNDERSTORM WILL AFFECT 
CENTRAL ROANOKE AND SOUTHWESTERN BOTETOURT COUNTIES...THE CITY OF
SALEM AND THE CITY OF ROANOKE...

Until 415 PM EDT. 

At 324 PM EDT, a strong thunderstorm was located near Catawba, moving
southeast at 10 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Roanoke...
Salem...
Vinton...
Troutville...
and Catawba.

This includes The following Locations The Salem Fairgrounds and
Roanoke Regional Airport.
 
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

When it is safe to do so, please send your reports of hail of any
size, as well as reports of any wind damage, including downed trees
or large limbs, to the National Weather Service by calling toll free
at 1...8 6 6...2 1 5...4 3 2 4. Reports and pictures can also be
shared on the National Weather Service Blacksburg Facebook page and
on Twitter.

LAT...LON 3738 7977 3735 7979 3731 7985 3730 7984
      3729 7985 3726 7986 3723 7984 3722 7985
      3722 7987 3721 7988 3718 7990 3716 7993
      3729 8019 3740 8012 3744 8005
TIME...MOT...LOC 1924Z 293DEG 9KT 3736 8006 

$$

Loconto

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 12:10 PM EDT	Special Weather Statement	RNK	Pulaski	35 min
Aug 7, 12:59 PM EDT	Special Weather Statement	RNK	Bath	46 min
Aug 7, 1:35 PM EDT	Special Weather Statement	RNK	Bland, Tazewell	55 min
Aug 7, 3:15 PM EDT	Special Weather Statement	RNK	Pulaski	45 min
Aug 7, 3:30 PM EDT	Special Weather Statement	RNK	Montgomery	45 min
Aug 7, 3:56 PM EDT	Special Weather Statement	RNK	Floyd, Montgomery, City of Radford	49 min
Aug 7, 4:12 PM EDT	Severe Thunderstorm Warning	RNK	Franklin, Montgomery, Roanoke, City of Roanoke, City of Salem	63 min
Aug 7, 4:29 PM EDT	Special Weather Statement	RNK	City of Lynchburg	46 min
Aug 7, 4:47 PM EDT	Areal Flood Advisory	RNK	Amherst, Bedford, Campbell, City of Lynchburg	72 min
Aug 7, 4:56 PM EDT	Special Weather Statement	RNK	Henry, Patrick	49 min
Aug 7, 5:05 PM EDT	Special Weather Statement	RNK	Franklin, Pittsylvania, City of Martinsville	40 min
Aug 7, 5:25 PM EDT	Special Weather Statement	RNK	Campbell	50 min
Aug 7, 5:32 PM EDT	Special Weather Statement	RNK	Buckingham	58 min
Aug 7, 5:57 PM EDT	Special Weather Statement	RNK	Henry, Pittsylvania, City of Danville, City of Martinsville	63 min
Aug 7, 6:18 PM EDT	Severe Thunderstorm Warning	RNK	Halifax, Pittsylvania	57 min
Aug 7, 6:44 PM EDT	Special Weather Statement	RNK	Campbell	61 min
Aug 7, 6:51 PM EDT	Severe Thunderstorm Warning	RNK	Campbell, Charlotte, Halifax, Pittsylvania	34 min
Aug 7, 7:11 PM EDT	Special Weather Statement	RNK	Charlotte	49 min
Aug 7, 3:03 PM EDT	Special Weather Statement	RNK	Stokes	42 min
Aug 7, 3:48 PM EDT	Special Weather Statement	RNK	Stokes	57 min
Aug 7, 4:49 PM EDT	Special Weather Statement	RNK	Yadkin	56 min
Aug 7, 4:52 PM EDT	Severe Thunderstorm Warning	RNK	Yadkin	53 min
Aug 7, 6:59 PM EDT	Special Weather Statement	RNK	Alleghany	46 min
Aug 7, 7:54 PM EDT	Special Weather Statement	RNK	Surry	51 min

Nearby

Special Weather Statements in Virginia, 2018 Every special weather statement in 2018

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.