Alert archive / North Carolina / Special Weather Statements in 2018
Special Weather Statement, NWS Raleigh, NC
NWS Raleigh, NC issued this special weather statement at May 18, 2018, 6:13 PM EDT for Johnston County, North Carolina. 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
- May 18, 2018, 6:13 PM EDT (22:13 UTC)
- Expired
- May 18, 2018, 7:15 PM EDT
- In force
- 62 min
- Issued by
- NWS Raleigh, NC
County Johnston County, NC
The radar
The Raleigh/Durham radar (KRAX), 22 km from the middle of the area, began a volume at 22:15 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
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 10.2 hours before the alert went out and 153 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.
- Mixed-layer CAPE
- 246 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 626 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted.
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</html>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 18, 3:35 PM EDT, 2 hours 38 minutes earlier.
Area forecast discussion, May 18, 3:35 PM EDT, 2 hours 38 minutes before
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Special weather statement, May 18, 2:31 PM EDT, 3 hours 42 minutes before
Special Weather Statement
National Weather Service Raleigh NC
231 PM EDT FRI MAY 18 2018
NCZ021-022-038-039-073>075-083-084-182000-
Guilford NC-Stanly NC-Richmond NC-Anson NC-Forsyth NC-Randolph NC-
Davidson NC-Moore NC-Montgomery NC-
231 PM EDT FRI MAY 18 2018
...Showers and thunderstorms with very heavy rain will become more
numerous and overspread the western Piedmont including the Triad
area through 400 PM EDT...
At 220 PM EDT, Doppler radar was tracking a large area of showers
with locally heavy rain and some embedded thunderstorms across the
Southern Piedmont that were spreading north at 25 to 30 MPH. The
strongest storms were located near Robbins, Seagrove, and Wadesboro
with additional storms popping up across the area.
Instantaneous rainfall rates in excess of 1.5 inches per hour will
will result in rapid rises on streams and creeks and possibly some
flooding of poor drainage areas or low lying areas.
Locations impacted include...
Greensboro, Winston-Salem, High Point, Asheboro, Lexington,
Albemarle, Rockingham, Wadesboro, Randleman and Troy.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Locally heavy rain will quickly reduce visibility and result in the
accumulation of water on roadways, standing water in low lying
areas, and minor flooding of creeks, streams, and areas of poor
drainage. 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.
&&
LAT...LON 3550 8030 3552 8018 3572 8033 3574 8046
3583 8049 3589 8037 3608 8052 3614 8044
3626 8045 3624 7954 3551 7954 3515 7961
3507 7957 3504 7946 3499 7957 3482 7962
3481 8032 3519 8028 3516 8044 3519 8051
TIME...MOT...LOC 1822Z 186DEG 31KT 3560 7977
BLAESSpecial weather statement, May 18, 4:06 PM EDT, 2 hours 7 minutes before
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</html>Special weather statement, May 18, 6:13 PM EDT, 0 minutes before
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</html>The office that day
Everything else NWS Raleigh, NC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 2:31 PM EDT | Special Weather Statement | RAH | Anson, Davidson, Forsyth, Guilford, Montgomery, Randolph and 2 more | 89 min |
| May 18, 2:41 PM EDT | Flash Flood Watch | RAH | Alamance, Chatham, Cumberland, Durham, Edgecombe, Forsyth and 19 more | 28 hr |
| May 18, 4:06 PM EDT | Special Weather Statement | RAH | Alamance, Guilford | 54 min |
| May 18, 5:35 PM EDT | Special Weather Statement | RAH | Orange, Person | 55 min |
Nearby
Special Weather Statements in North Carolina, 2018Every 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.