Alert archive / North Carolina / Special Weather Statements in 2018
Special Weather Statement, NWS Raleigh, NC
NWS Raleigh, NC issued this special weather statement at Aug 20, 2018, 11:17 PM EDT for Wake County, North Carolina. It was in force for 58 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 20, 2018, 11:17 PM EDT (03:17 UTC)
- Expired
- Aug 21, 2018, 12:15 AM EDT
- In force
- 58 min
- Issued by
- NWS Raleigh, NC
County Wake County, NC
The radar
The Raleigh/Durham radar (KRAX), 16 km from the middle of the area, began a volume at 03:19 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, 3.3 hours before the alert went out and 126 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
- 1032 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 765 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.0
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 Aug 20, 8:45 PM EDT, 2 hours 32 minutes earlier.
Area forecast discussion, Aug 20, 8:45 PM EDT, 2 hours 32 minutes before
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Hazardous Weather Outlook National Weather Service Raleigh NC 1109 PM EDT Mon Aug 20 2018 NCZ007>011-021>028-038>043-073>078-083>086-088-089-220315- 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- 1109 PM EDT Mon Aug 20 2018 This Hazardous Weather Outlook is for central North Carolina. .DAY ONE...Tonight. Torrential downpours with the storms may trigger flash flooding on area streets, creeks, and poor drainage areas. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. There is a chance for severe thunderstorms Tuesday afternoon through Tuesday evening, mainly between 4 PM and 11 PM. The main severe weather hazards will be hail up to the size of pennies or quarters, and straight-line wind gusts around 60 mph. Also, torrential downpours may trigger flash flooding in area streets and poor drainage areas. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
In the hours before
Special weather statement, Aug 20, 6:44 PM EDT, 4 hours 33 minutes before
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</html>Special weather statement, Aug 20, 11:17 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Raleigh NC
1117 PM EDT MON AUG 20 2018
NCZ041-210415-
Wake NC-
1117 PM EDT MON AUG 20 2018
...A STRONG THUNDERSTORM WILL AFFECT WAKE COUNTY UNTIL 1215 AM EDT...
At 1115 PM EDT, Doppler radar was tracking a strong thunderstorm
over Raleigh, moving northeast at 15 mph. The primary threat with
this storm is heavy rainfall and minor flooding. There will likely
be some ponding of water on roadways, however flash flooding is not
expected at this time.
Wind gusts up to 40 mph will also be possible with this storm.
Locations impacted include...
Raleigh, Cary, Wake Forest, Garner, Zebulon, Rdu International,
Morrisville, Knightdale, Wendell and Rolesville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
Locally heavy rain will quickly reduce visibility and result in
ponding 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 3604 7860 3581 7830 3573 7842 3571 7846
3571 7847 3557 7864 3583 7888
TIME...MOT...LOC 0315Z 241DEG 15KT 3578 7868
10The office that day
Everything else NWS Raleigh, NC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 8:04 PM EDT | Special Weather Statement | RAH | Davidson | 56 min |
| Aug 20, 8:08 PM EDT | Special Weather Statement | RAH | Moore | 67 min |
| Aug 20, 10:58 PM EDT | Areal Flood Advisory | RAH | Johnston, Wayne | 3 hr |
| Aug 21, 12:27 AM EDT | Special Weather Statement | RAH | Franklin | 63 min |
| Aug 21, 1:04 AM EDT | Special Weather Statement | RAH | Johnston | 56 min |
| Aug 21, 3:41 AM EDT | River Flood Warning | RAH | Johnston | 21 hr |
| Aug 21, 4:30 PM EDT | Special Weather Statement | RAH | Davidson, Forsyth | 60 min |
| Aug 21, 5:00 PM EDT | Severe Thunderstorm Warning | RAH | Davidson, Forsyth | 43 min |
| Aug 21, 5:45 PM EDT | Special Weather Statement | RAH | Davidson | 30 min |
| Aug 21, 6:10 PM EDT | Special Weather Statement | RAH | Randolph | 35 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.