Alert archive / Virginia / Special Weather Statements in 2021

Special Weather Statement, NWS Blacksburg, VA

January 18, 2021Floyd County, Franklin County, Virginia

NWS Blacksburg, VA issued this special weather statement at Jan 18, 2021, 4:13 AM EST for Floyd County, Franklin County, Virginia. It was in force for 47 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
Jan 18, 2021, 4:13 AM EST (09:13 UTC)
Expired
Jan 18, 2021, 5:00 AM EST
In force
47 min
Issued by
NWS Blacksburg, VA

Counties Floyd County, VA, Franklin County, VA

The radar

The Roanoke radar (KFCX), 10 km from the middle of the area, began a volume at 09:15 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 00:00Z, 9.2 hours before the alert went out and 80 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-pSkew-T log-p diagram, Roanoke, VA at 00:00Z on 2021-01-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Roanoke, VA at 00:00Z on 2021-01-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 square meters per square second.1939587897117136156175Sfc1 km3 km6 km9 kmRMLM
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
1080 m above ground
0-6 km bulk shear
102 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
70 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

863 
WWUS81 KRNK 180913
SPSRNK

Special Weather Statement
National Weather Service BLACKSBURG VA
413 AM EST Mon Jan 18 2021

VAZ017-032-033-043-181000-
Henry-Franklin-Patrick-Floyd-
413 AM EST Mon Jan 18 2021

...A BAND OF HEAVY SNOW WILL AFFECT FLOYD...NORTHWESTERN 
HENRY...SOUTHERN FRANKLIN AND NORTHEASTERN PATRICK COUNTIES...

At 412 AM EST, a band of heavy snow was located over Floyd, moving 
east at 30 mph.

A quick dusting of snow to several tenths of an inch will occur with 
these bands, leading to slick roads.

Locations impacted include...
Rocky Mount...
Floyd...
Indian Valley...
Bassett...
Sydnorsville...
Ferrum...
and Woolwine.

Be prepared for snow or ice covered roads. Slow down and allow extra 
time when traveling.

LAT...LON 3683 8056 3690 8061 3701 8043 3700 8042
      3701 8041 3702 8041 3701 8039 3702 8038
      3702 8035 3706 8031 3702 7967 3665 8003
TIME...MOT...LOC 0912Z 286DEG 28KT 3693 8028 

$$

BMG

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 18, 2:43 AM ESTSpecial Weather StatementRNKBland, Craig, Giles, Pulaski, Roanoke, Wythe62 min
Jan 18, 3:33 AM ESTSpecial Weather StatementRNKCarroll, Pulaski, Wythe, City of Galax, City of Radford42 min
Jan 18, 4:16 AM ESTSpecial Weather StatementRNKCarroll, Wythe44 min
Jan 18, 4:58 AM ESTSpecial Weather StatementRNKFloyd32 min
Jan 18, 9:59 AM ESTSpecial Weather StatementRNKAlleghany, City of Covington46 min
Jan 18, 11:44 AM ESTSpecial Weather StatementRNKAmherst, Botetourt, City of Lynchburg61 min

Nearby

Special Weather Statements in Virginia, 2021Every special weather statement in 2021

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.