Alert archive / North Carolina / Special Weather Statements in 2017

Special Weather Statement, NWS Blacksburg, VA

July 27, 2017Rockingham County, North Carolina

NWS Blacksburg, VA issued this special weather statement at Jul 27, 2017, 6:55 PM EDT for Rockingham County, North Carolina. It was in force for 65 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 27, 2017, 6:55 PM EDT (22:55 UTC)
Expired: Jul 27, 2017, 8:00 PM EDT
In force: 65 min
Issued by: NWS Blacksburg, VA

County Rockingham County, NC

The radar

The Roanoke radar (KFCX), 81 km from the middle of the area, began a volume at 22:57 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, 10.9 hours before the alert went out and 107 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: 32 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 865 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 27, 6:25 PM EDT, 30 minutes earlier.

Area forecast discussion, Jul 27, 6:25 PM EDT, 30 minutes before

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Hazardous weather outlook, Jul 27, 4:01 PM EDT, 2 hours 54 minutes before

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In the hours before

Special weather statement, Jul 27, 3:13 PM EDT, 3 hours 42 minutes before

Special Weather Statement
National Weather Service BLACKSBURG VA
313 PM EDT THU JUL 27 2017

VAZ017-033-272015-
Franklin-Floyd-
313 PM EDT THU JUL 27 2017

...A STRONG THUNDERSTORM WILL AFFECT EASTERN FLOYD AND FRANKLIN
COUNTIES THROUGH 415 PM EDT...

At 312 PM EDT, a strong thunderstorm was located near Endicott,
moving east at 30 mph.

Winds in excess of 30 mph are possible with this storm. Frequent
lightning and very heavy rainfall can also be expected with this
thunderstorm.

Locations impacted include...
Rocky Mount...
Floyd...
Sydnorsville...
Ferrum...
and Snow Creek.

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.

LAT...LON 3690 8035 3703 8034 3707 7973 3682 7973
TIME...MOT...LOC 1912Z 276DEG 27KT 3694 8020

RAB

Special weather statement, Jul 27, 3:25 PM EDT, 3 hours 30 minutes before

Special Weather Statement
National Weather Service BLACKSBURG VA
325 PM EDT THU JUL 27 2017

VAZ034-035-044>046-272030-
Amherst-Campbell-Bedford-Pittsylvania-Appomattox-
325 PM EDT THU JUL 27 2017

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT
APPOMATTOX...CAMPBELL...NORTHEASTERN PITTSYLVANIA...SOUTHERN
BEDFORD...AND SOUTHEASTERN AMHERST COUNTIES AND THE CITY OF
LYNCHBURG THROUGH 430 PM EDT...

At 324 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Smith Mountain Lake State Park to
Evington to near Bocock. Movement was east at 45 mph.

Winds in excess of 30 mph are possible with these storms. Frequent
lightning and very heavy rainfall can also be expected with these
thunderstorms.

Locations impacted include...
Lynchburg...
Altavista...
Appomattox...
Hurt...
and Brookneal.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

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

LAT...LON 3723 7877 3720 7883 3702 7890 3705 7897
      3703 7901 3706 7909 3700 7911 3697 7946
      3716 7970 3715 7970 3715 7971 3719 7972
      3719 7976 3722 7977 3722 7981 3728 7943
      3758 7902 3754 7882 3755 7882 3745 7870
TIME...MOT...LOC 1924Z 282DEG 40KT 3713 7962 3721 7927 3741 7905

RAB

Special weather statement, Jul 27, 4:17 PM EDT, 2 hours 38 minutes before

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Special weather statement, Jul 27, 4:38 PM EDT, 2 hours 17 minutes before

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Special weather statement, Jul 27, 5:40 PM EDT, 1 hour 15 minutes before

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Special weather statement, Jul 27, 6:55 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 27, 2:03 PM EDT	Special Weather Statement	RNK	Botetourt, Montgomery, Pulaski, Roanoke, City of Radford, City of Roanoke and 1 more	57 min
Jul 27, 2:40 PM EDT	Special Weather Statement	RNK	Bedford, City of Lynchburg	65 min
Jul 27, 2:55 PM EDT	Special Weather Statement	RNK	City of Roanoke, City of Salem	65 min
Jul 27, 3:13 PM EDT	Special Weather Statement	RNK	Franklin	62 min
Jul 27, 3:25 PM EDT	Special Weather Statement	RNK	Appomattox, Campbell, City of Lynchburg	65 min
Jul 27, 4:38 PM EDT	Special Weather Statement	RNK	Halifax, Pittsylvania	52 min
Jul 27, 4:17 PM EDT	Special Weather Statement	RNK	Wilkes	43 min
Jul 27, 5:40 PM EDT	Special Weather Statement	RNK	Alleghany, Rockingham, Stokes, Surry	65 min

Nearby

Special Weather Statements in North Carolina, 2017 Every special weather statement in 2017

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.