Alert archive / Virginia / Special Weather Statements in 2018

Special Weather Statement, NWS Blacksburg, VA

July 23, 2018Alleghany County, Virginia

NWS Blacksburg, VA issued this special weather statement at Jul 23, 2018, 8:13 PM EDT for Alleghany County, Virginia. It was in force for 62 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 23, 2018, 8:13 PM EDT (00:13 UTC)
Expired: Jul 23, 2018, 9:15 PM EDT
In force: 62 min
Issued by: NWS Blacksburg, VA

County Alleghany County, VA

The radar

The Roanoke radar (KFCX), 66 km from the middle of the area, began a volume at 00:17 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 00:00Z, 0.2 hours before the alert went out and 275 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: 791 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 722 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

As transmitted.

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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 23, 7:34 PM EDT, 39 minutes earlier.

Area forecast discussion, Jul 23, 7:34 PM EDT, 39 minutes before

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Hazardous weather outlook, Jul 23, 7:20 PM EDT, 53 minutes before

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In the hours before

Special weather statement, Jul 23, 5:57 PM EDT, 2 hours 16 minutes before

Special Weather Statement
National Weather Service BLACKSBURG VA
557 PM EDT MON JUL 23 2018

VAZ044-058-232230-
Halifax-Pittsylvania-
557 PM EDT MON JUL 23 2018

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT
SOUTHERN PITTSYLVANIA AND SOUTHWESTERN HALIFAX COUNTIES AND THE
NORTHWESTERN CITY OF DANVILLE...

Until 630 PM EDT

At 554 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Turbeville to near Blairs to near
Mayfield. Movement was northwest at 15 mph.

Heavy rain, pea size hail, and winds in excess of 30 mph are
possible with this storm. Heavy rainfall may cause localized
flooding. Do not drive your vehicle through flooded roadways.

Locations impacted include...
Danville...
Chatham...
Blairs...
Ingram...
and Java.

LAT...LON 3663 7970 3674 7967 3685 7952 3688 7914
      3663 7898 3664 7934 3654 7957 3654 7966
TIME...MOT...LOC 2154Z 142DEG 14KT 3664 7908 3664 7936 3655 7957

RS

Special weather statement, Jul 23, 6:26 PM EDT, 1 hour 47 minutes before

Special Weather Statement
National Weather Service BLACKSBURG VA
626 PM EDT MON JUL 23 2018

VAZ033-044-232300-
Franklin-Pittsylvania-
626 PM EDT MON JUL 23 2018

...A STRONG THUNDERSTORM WILL AFFECT
NORTHWESTERN PITTSYLVANIA AND EAST CENTRAL FRANKLIN COUNTIES...

Until 700 PM EDT

At 624 PM EDT, a strong thunderstorm was located near Climax, moving
northwest at 25 mph.

Heavy rain, pea size hail, and winds in excess of 30 mph are
possible with this storm. Heavy rainfall may cause localized
flooding. Do not drive your vehicle through flooded roadways.

Locations impacted include...
Penhook...
Callands...
Sago...
Climax...
and Pittsville.

If you are on or near Smith Mountain, get out of the water and move
indoors or inside a vehicle. Remember, lightning can strike out to
10 miles from the parent thunderstorm. If you can hear thunder, you
are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.

LAT...LON 3677 7960 3682 7965 3685 7964 3684 7966
      3683 7966 3696 7981 3706 7960 3704 7958
      3703 7956 3705 7954 3703 7951 3706 7949
      3704 7950 3702 7950 3704 7948 3702 7949
      3701 7948 3701 7947 3686 7940
TIME...MOT...LOC 2224Z 146DEG 22KT 3685 7952

RS

Special weather statement, Jul 23, 6:29 PM EDT, 1 hour 44 minutes before

Special Weather Statement
National Weather Service BLACKSBURG VA
629 PM EDT MON JUL 23 2018

VAZ058-059-232300-
Halifax-Charlotte-
629 PM EDT MON JUL 23 2018

...A STRONG THUNDERSTORM WILL AFFECT
WEST CENTRAL CHARLOTTE AND NORTHWESTERN HALIFAX COUNTIES...

Until 700 PM EDT

At 628 PM EDT, a strong thunderstorm was located over Crystal Hill,
moving northwest at 20 mph.

Heavy rain, pea size hail, and winds in excess of 30 mph are
possible with this storm. Heavy rainfall may cause localized
flooding. Do not drive your vehicle through flooded roadways.

Locations impacted include...
Nathalie...
Mt Laurel...
Crystal Hill...
and Cody.

LAT...LON 3678 7893 3695 7912 3696 7912 3704 7896
      3702 7891 3707 7888 3688 7873
TIME...MOT...LOC 2228Z 144DEG 18KT 3687 7889

RS

Special weather statement, Jul 23, 6:46 PM EDT, 1 hour 27 minutes before

Special Weather Statement
National Weather Service BLACKSBURG VA
646 PM EDT MON JUL 23 2018

NCZ001-003-004-019-020-232345-
Stokes-Yadkin-Surry-Ashe-Wilkes-
646 PM EDT MON JUL 23 2018

...A LINE OF THUNDERSTORMS WILL AFFECT
SURRY...EASTERN WILKES...STOKES...EAST CENTRAL ASHE AND YADKIN
COUNTIES...

Until 745 PM EDT

At 640 PM EDT, radar indicated thunderstorms were located
along a line extending from near Kernersville to near Harmony.
Movement was north at 20 mph.

Heavy rain, pea size hail, and winds in excess of 30 mph are
possible with this storm. The duration of heavy rain may only last
15 to 20 minutes this evening and drop a half to one inch of rain
over the area. Following this line of thunderstorms, steady light
rain will continue to fall through the remainder of the
evening. Heavy rainfall may cause localized flooding. Do not drive
your vehicle through flooded roadways.

Locations impacted include...
Mount Airy...
North Wilkesboro...
Elkin...
Wilkesboro...
and Fairview.

LAT...LON 3641 8134 3644 8127 3636 8125 3643 8117
      3642 8113 3643 8108 3638 8103 3637 8098
      3641 8096 3645 8098 3656 8090 3654 8006
      3626 8004 3626 8045 3614 8044 3611 8051
      3606 8051 3605 8050 3606 8098 3603 8106
TIME...MOT...LOC 2240Z 167DEG 18KT 3617 8007 3595 8084

RS

Special weather statement, Jul 23, 7:41 PM EDT, 32 minutes before

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Special weather statement, Jul 23, 8:13 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 23, 8:52 PM EDT	Special Weather Statement	RNK	Appomattox	23 min
Jul 23, 8:53 PM EDT	Special Weather Statement	RNK	Botetourt	37 min
Jul 24, 6:36 PM EDT	Flash Flood Warning	RNK	Grayson	3 hr
Jul 24, 7:22 PM EDT	Areal Flood Advisory	RNK	Bland, Smyth, Tazewell, Wythe	2 hr
Jul 24, 7:53 PM EDT	Areal Flood Advisory	RNK	Amherst, Bedford, Campbell, Halifax, Pittsylvania, City of Lynchburg	6 hr
Jul 24, 9:54 AM EDT	Special Weather Statement	RNK	Yadkin	66 min
Jul 24, 11:14 AM EDT	Special Weather Statement	RNK	Yadkin	61 min
Jul 24, 1:00 PM EDT	Areal Flood Advisory	RNK	Rockingham, Stokes	3 hr
Jul 24, 4:34 PM EDT	Special Weather Statement	RNK	Mercer	56 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.