Alert archive / North Carolina / Special Weather Statements in 2018

Special Weather Statement, NWS Raleigh, NC

May 23, 2018Alamance County, North Carolina

NWS Raleigh, NC issued this special weather statement at May 23, 2018, 3:20 PM EDT for Alamance County, North Carolina. It was in force for 55 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: May 23, 2018, 3:20 PM EDT (19:20 UTC)
Expired: May 23, 2018, 4:15 PM EDT
In force: 55 min
Issued by: NWS Raleigh, NC

County Alamance County, NC

The radar

The Raleigh/Durham radar (KRAX), 112 km from the middle of the area, began a volume at 19:20 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 12:00Z, 7.3 hours before the alert went out and 34 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: 169 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 809 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 52 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 Raleigh, NC wrote its last area forecast discussion before this special weather statement went out at May 23, 1:25 PM EDT, 1 hour 55 minutes earlier.

Area forecast discussion, May 23, 1:25 PM EDT, 1 hour 55 minutes before

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Hazardous weather outlook, May 23, 3:18 AM EDT, 12 hours 2 minutes before

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In the hours before

Special weather statement, May 23, 3:01 PM EDT, 19 minutes before

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Special weather statement, May 23, 3:09 PM EDT, 11 minutes before

Special Weather Statement
National Weather Service Raleigh NC
309 PM EDT WED MAY 23 2018

NCZ026-027-231945-
Nash NC-Franklin NC-
309 PM EDT WED MAY 23 2018

...A DEVELOPING STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL NASH
AND NORTHEASTERN FRANKLIN COUNTIES UNTIL 345 PM EDT...

At 308 PM EDT, Doppler radar was tracking a developing thunderstorm
near Louisburg, moving southeast at 15 mph.

Pea size hail, heavy rain, and wind gusts up to 40 mph will be
possible with this storm.

Locations impacted include...
Castalia, Centerville and Ingleside.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter in a nearby building or vehicle. Wind gusts as high as
40 mph are capable of knocking down tree limbs and blowing around
trash cans, potted plants, lawn furniture and other light outdoor
objects.

&&

LAT...LON 3623 7812 3621 7811 3621 7805 3620 7800
      3618 7798 3618 7797 3619 7797 3619 7796
      3618 7796 3601 7807 3618 7834 3625 7830
TIME...MOT...LOC 1908Z 293DEG 14KT 3619 7826

MORROW

Special weather statement, May 23, 3:20 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Raleigh NC
320 PM EDT WED MAY 23 2018

NCZ022-023-232015-
Guilford NC-Alamance NC-
320 PM EDT WED MAY 23 2018

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHERN ALAMANCE AND
NORTHEASTERN GUILFORD COUNTIES UNTIL 415 PM EDT. THIS INCLUDES LAKE
TOWNSEND AND LAKE CAMMACK...

At 318 PM EDT, Doppler radar was tracking a line of strong
thunderstorms along a line extending from near Reidsville to near
Bethany. Movement was southeast at 15 mph.

Pea size hail, heavy rainfall, frequent lightning, and wind gusts up
to 40 mph will be possible with these storms.

Locations impacted include...
Greensboro, Burlington, Graham, Mebane, McLeansville, Elon College,
Summerfield, Gibsonville, Haw River and Swepsonville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Townsend or Lake Cammack, 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 3624 7957 3624 7953 3625 7953 3624 7926
      3604 7926 3605 7975 3625 7991
TIME...MOT...LOC 1918Z 314DEG 13KT 3630 7962 3630 7990

MORROW

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 3:01 PM EDT	Special Weather Statement	RAH	Stanly	44 min
May 23, 3:09 PM EDT	Special Weather Statement	RAH	Franklin	36 min
May 23, 3:34 PM EDT	Special Weather Statement	RAH	Durham	41 min
May 23, 3:43 PM EDT	Special Weather Statement	RAH	Nash	62 min
May 23, 4:01 PM EDT	Special Weather Statement	RAH	Stanly	44 min
May 23, 4:04 PM EDT	Special Weather Statement	RAH	Chatham	56 min
May 23, 4:19 PM EDT	Severe Thunderstorm Warning	RAH	Chatham, Wake	41 min
May 23, 4:34 PM EDT	Special Weather Statement	RAH	Franklin	26 min
May 23, 4:56 PM EDT	Special Weather Statement	RAH	Warren	34 min
May 23, 5:01 PM EDT	Special Weather Statement	RAH	Halifax	59 min
May 23, 5:04 PM EDT	Special Weather Statement	RAH	Cumberland, Sampson, Wayne	56 min
May 23, 5:05 PM EDT	Special Weather Statement	RAH	Anson, Richmond	55 min
May 23, 5:15 PM EDT	Special Weather Statement	RAH	Granville	45 min
May 23, 5:26 PM EDT	Special Weather Statement	RAH	Franklin	49 min
May 23, 5:33 PM EDT	Special Weather Statement	RAH	Cumberland	42 min
May 23, 5:41 PM EDT	Special Weather Statement	RAH	Vance	34 min
May 23, 5:55 PM EDT	Special Weather Statement	RAH	Halifax	65 min
May 23, 6:05 PM EDT	Special Weather Statement	RAH	Hoke, Scotland	55 min
May 23, 7:00 PM EDT	Special Weather Statement	RAH	Sampson	60 min
May 23, 7:17 PM EDT	Severe Thunderstorm Warning	RAH	Sampson	33 min
May 23, 7:24 PM EDT	Special Weather Statement	RAH	Randolph	51 min
May 23, 7:27 PM EDT	Special Weather Statement	RAH	Wilson	48 min

Nearby

Special Weather Statements in North Carolina, 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.