Alert archive / North Carolina / Special Weather Statements in 2020

Special Weather Statement, NWS Raleigh, NC

August 6, 2020Granville County, Orange County, Person County, North Carolina

NWS Raleigh, NC issued this special weather statement at Aug 6, 2020, 3:12 AM EDT for Granville County, Orange County, Person County, North Carolina. It was in force for 63 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 6, 2020, 3:12 AM EDT (07:12 UTC)
Expired: Aug 6, 2020, 4:15 AM EDT
In force: 63 min
Issued by: NWS Raleigh, NC

Counties Granville County, NC, Orange County, NC, Person County, NC

The radar

The Raleigh/Durham radar (KRAX), 83 km from the middle of the area, began a volume at 07:12 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 7.2 hours before the alert went out and 87 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: 1840 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 1137 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.3

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 Raleigh, NC wrote its last area forecast discussion before this special weather statement went out at Aug 6, 3:03 AM EDT, 9 minutes earlier.

Area forecast discussion, Aug 6, 3:03 AM EDT, 9 minutes before

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Hazardous weather outlook, Aug 5, 6:48 AM EDT, 20 hours 24 minutes before

Hazardous Weather Outlook
National Weather Service Raleigh NC
648 AM EDT Wed Aug 5 2020

NCZ007>011-021>028-038>043-073>078-083>086-088-089-061100-
Person-Granville-Vance-Warren-Halifax-Forsyth-Guilford-Alamance-
Orange-Durham-Franklin-Nash-Edgecombe-Davidson-Randolph-Chatham-Wake-
Johnston-Wilson-Stanly-Montgomery-Moore-Lee-Harnett-Wayne-Anson-
Richmond-Scotland-Hoke-Cumberland-Sampson-
648 AM EDT Wed Aug 5 2020

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...Today and tonight.

Widespread hazardous weather is not expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Scattered to numerous showers and thunderstorms are expected
Thursday afternoon into the evening hours. A few of these storms may
become strong to locally severe, with the main hazard of damaging
wind gusts. Locally heavy rain may also pose a risk of flooding
mainly in urban and poor drainage areas.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Aug 5, 10:59 PM EDT, 4 hours 13 minutes before

Special Weather Statement
National Weather Service Raleigh NC
1059 PM EDT Wed Aug 5 2020

NCZ021-038-060430-
Forsyth NC-Davidson NC-
1059 PM EDT Wed Aug 5 2020

...THUNDERSTORMS WITH FREQUENT LIGHTNING AND VERY HEAVY RAIN ALONG
THE YADKIN AND FORSYTH COUNTY LINE WILL AFFECT WESTERN FORSYTH AND
NORTH CENTRAL DAVIDSON COUNTIES UNTIL 1230 AM EDT...

At 1053 PM EDT, radar indicated thunderstorms with very heavy rain
from Lone Hickory and Huntsville in Yadkin County north and east to
near Lewisville and Clemmons in Forsyth County. These storms were
developing southeast at 5 to 10 mph into the Clemmons and Arcadia to
the west side of Winston-Salem.

Very heavy rain in excess of an inch in 20 minutes and minor
flooding and deadly cloud to ground lightning will be possible with
these storms.

Locations impacted include...
Winston-Salem, Clemmons, Bermuda Run, Huntsville, Lewisville, Rural
Hall, Arcadia, Stanleyville, Pfafftown and Donnaha.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drivers are urged to slow down and use extra caution to avoid
hydroplaning, especially in urban areas where prolonged heavy rain
can quickly lead to flooding.

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 3611 8050 3612 8046 3614 8044 3621 8045
      3622 8043 3624 8045 3626 8045 3626 8026
      3625 8023 3617 8021 3602 8014 3591 8037
      3596 8038 3599 8042 3601 8042 3606 8046
      3604 8049 3608 8052
TIME...MOT...LOC 0253Z 324DEG 5KT 3609 8048

PWB

Special weather statement, Aug 6, 12:33 AM EDT, 2 hours 39 minutes before

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Special weather statement, Aug 6, 2:27 AM EDT, 45 minutes before

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Special weather statement, Aug 6, 3:12 AM EDT, 0 minutes before

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The office that day

Everything else NWS Raleigh, NC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 5, 8:54 PM EDT	Special Weather Statement	RAH	Forsyth	36 min
Aug 5, 10:59 PM EDT	Special Weather Statement	RAH	Forsyth	91 min
Aug 5, 11:32 PM EDT	Areal Flood Advisory	RAH	Davidson, Forsyth	100 min
Aug 6, 12:02 AM EDT	Flash Flood Warning Considerable damage threat	RAH	Forsyth	86 min
Aug 6, 12:33 AM EDT	Special Weather Statement	RAH	Guilford	57 min
Aug 6, 2:27 AM EDT	Special Weather Statement	RAH	Alamance, Orange, Person	78 min
Aug 6, 1:05 PM EDT	Special Weather Statement	RAH	Sampson	55 min
Aug 6, 1:43 PM EDT	Special Weather Statement	RAH	Durham	62 min
Aug 6, 2:03 PM EDT	Severe Thunderstorm Warning	RAH	Durham, Franklin, Granville, Wake	57 min
Aug 6, 3:05 PM EDT	Special Weather Statement	RAH	Harnett, Lee	55 min
Aug 6, 3:26 PM EDT	Special Weather Statement	RAH	Orange	34 min
Aug 6, 3:27 PM EDT	Special Weather Statement	RAH	Franklin, Nash, Wake	63 min
Aug 6, 3:42 PM EDT	Severe Thunderstorm Warning	RAH	Franklin, Johnston, Nash, Wake, Wilson	48 min
Aug 6, 4:13 PM EDT	Flash Flood Warning Considerable damage threat	RAH	Harnett	2 hr
Aug 6, 4:31 PM EDT	Special Weather Statement	RAH	Johnston	59 min
Aug 6, 4:45 PM EDT	Special Weather Statement	RAH	Montgomery	60 min
Aug 6, 4:56 PM EDT	Areal Flood Advisory	RAH	Franklin, Johnston, Nash, Wake, Wilson	3 hr
Aug 6, 5:43 PM EDT	Severe Thunderstorm Warning	RAH	Person	47 min
Aug 6, 6:03 PM EDT	Special Weather Statement	RAH	Forsyth, Guilford	57 min
Aug 6, 6:26 PM EDT	Flash Flood Warning Considerable damage threat	RAH	Forsyth	3 hr
Aug 6, 6:32 PM EDT	Severe Thunderstorm Warning	RAH	Forsyth, Guilford	43 min
Aug 6, 6:45 PM EDT	Flash Flood Warning Considerable damage threat	RAH	Guilford	8 hr
Aug 6, 7:03 PM EDT	Flash Flood Warning Considerable damage threat	RAH	Davidson	4 hr
Aug 6, 7:48 PM EDT	Special Weather Statement	RAH	Davidson, Guilford, Randolph	57 min

Nearby

Special Weather Statements in North Carolina, 2020 Every special weather statement in 2020

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.