Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 83, NWS Raleigh, NC

July 17, 2021Guilford County, North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at Jul 17, 2021, 4:43 PM EDT for Guilford County, North Carolina. It was in force for 47 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 17, 2021, 4:43 PM EDT (20:43 UTC)
Expired: Jul 17, 2021, 5:30 PM EDT
In force: 47 min
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Guilford County, NC

The radar

The Roanoke radar (KFCX), 109 km from the middle of the area, began a volume at 20:47 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.

What was reported inside it

Time	Report	Where	Remark
Jul 17, 4:55 PM EDT	TSTM WND DMG	2 Nne Greensboro, NC	A TREE FELL DOWN AND KNOCKED DOWN POWER LINES NEAR THE INTERSECTION OF ROSECREST DR. AND HAWTHORNE ST IN GREENSBORO.
Jul 17, 4:58 PM EDT	TSTM WND DMG	3 Sse Lake Townsend, NC	A TREE WAS REPORTED DOWN NEAR THE INTERSECTION OF RANKIN RD AND SUMMIT AVE.
Jul 17, 4:58 PM EDT	TSTM WND DMG	4 Ne Greensboro, NC	A TREE WAS REPORTED DOWN NEAR THE INTERSECTION OF EAST CONE BLVD AND YANCEYVILLE ST.
Jul 17, 5:04 PM EDT	TSTM WND DMG	1 Wnw Greensboro, NC	A TREE WAS REPORTED DOWN NEAR THE INTERSECTION OF W FRIENDLY AVE AND HOBBS RD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 8.7 hours before the alert went out and 15 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: 966 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 843 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

572 
WUUS52 KRAH 172043
SVRRAH
NCC081-172130-
/O.NEW.KRAH.SV.W.0083.210717T2043Z-210717T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Raleigh NC
443 PM EDT Sat Jul 17 2021

The National Weather Service in Raleigh has issued a

* Severe Thunderstorm Warning for...
  Guilford County in central North Carolina...

* Until 530 PM EDT.

* At 442 PM EDT, a severe thunderstorm was located near High Point,
  moving northeast at 30 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Greensboro, High Point, McLeansville, Summerfield, Gibsonville,
  Pleasant Garden, Jamestown, Haw River State Park, Lake Guilford
  Mackintosh Marina and Forest Oaks.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Straight line winds can blow down trees, power lines, and damage
mobile homes and other buildings. Seek shelter in a sturdy structure
until the storm has passed. Stay away from windows as flying debris
generated by damaging winds can be deadly.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3624 7953 3601 7954 3594 8004 3618 8003
      3625 7982
TIME...MOT...LOC 2042Z 245DEG 26KT 3601 8000 

HAIL...0.75IN
WIND...60MPH
 
$$
pwb

2 follow-up statements

843 
WWUS52 KRAH 172054
SVSRAH

Severe Weather Statement
National Weather Service Raleigh NC
454 PM EDT Sat Jul 17 2021

NCC081-172130-
/O.CON.KRAH.SV.W.0083.000000T0000Z-210717T2130Z/
Guilford NC-
454 PM EDT Sat Jul 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR CENTRAL GUILFORD COUNTY...

At 454 PM EDT, a severe thunderstorm was located near Greensboro,
moving east at 25 mph.

HAZARD...60 mph wind gusts and penny size hail. Frequent deadly 
         lightning. 

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Greensboro, High Point, McLeansville, Summerfield, Gibsonville,
Jamestown, Haw River State Park, Lake Guilford Mackintosh Marina,
Lake Jeanette Marina and Monticello.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Straight line winds can blow down trees, power lines, and damage
mobile homes and other buildings. Seek shelter in a sturdy structure
until the storm has passed. Stay away from windows as flying debris
generated by damaging winds can be deadly.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3598 8004 3605 8002 3611 7987 3623 7989
      3625 7983 3624 7956 3624 7953 3601 7954
TIME...MOT...LOC 2054Z 257DEG 22KT 3604 7988 

HAIL...0.75IN
WIND...60MPH
 
$$

pwb

644 
WWUS52 KRAH 172117
SVSRAH

Severe Weather Statement
National Weather Service Raleigh NC
517 PM EDT Sat Jul 17 2021

NCC081-172130-
/O.CON.KRAH.SV.W.0083.000000T0000Z-210717T2130Z/
Guilford NC-
517 PM EDT Sat Jul 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR NORTHEASTERN GUILFORD COUNTY...

At 517 PM EDT, a severe thunderstorm was located near McLeansville,
or 9 miles northeast of Greensboro, moving northeast at 15 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
McLeansville, Haw River State Park, Monticello, Lake Townsend Marina
and Lake Townsend.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Straight line winds can blow down trees, power lines, and damage
mobile homes and other buildings. Seek shelter in a sturdy structure
until the storm has passed. Stay away from windows as flying debris
generated by damaging winds can be deadly.

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3607 7970 3615 7975 3618 7978 3624 7980
      3625 7978 3624 7956 3624 7954 3623 7953
      3614 7953 3609 7964
TIME...MOT...LOC 2117Z 236DEG 13KT 3618 7970 

HAIL...0.75IN
WIND...60MPH
 
$$

pwb

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 3:56 PM EDT	Special Weather Statement	RAH	Forsyth	64 min
Jul 17, 4:24 PM EDT	Special Weather Statement	RAH	Randolph	36 min
Jul 17, 4:35 PM EDT	Special Weather Statement	RAH	Johnston	40 min
Jul 17, 4:41 PM EDT	Special Weather Statement	RAH	Guilford	34 min
Jul 17, 5:06 PM EDT	Areal Flood Advisory	RAH	Guilford	3 hr
Jul 17, 5:21 PM EDT	Severe Thunderstorm Warning	RAH	Alamance, Orange	39 min
Jul 17, 5:32 PM EDT	Special Weather Statement	RAH	Davidson, Guilford	58 min
Jul 17, 5:44 PM EDT	Severe Thunderstorm Warning	RAH	Durham, Orange, Person	44 min
Jul 17, 6:32 PM EDT	Special Weather Statement	RAH	Guilford	58 min
Jul 17, 6:40 PM EDT	Special Weather Statement	RAH	Wayne	35 min
Jul 17, 6:57 PM EDT	Special Weather Statement	RAH	Sampson	63 min
Jul 17, 7:33 PM EDT	Special Weather Statement	RAH	Guilford	42 min
Jul 17, 7:42 PM EDT	Special Weather Statement	RAH	Wayne	63 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.