Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 87, NWS Raleigh, NC

July 17, 2021Forsyth County, Guilford County, North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at Jul 17, 2021, 8:49 PM EDT for Forsyth County, Guilford County, North Carolina. It was in force for 23 min. 3 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, 8:49 PM EDT (00:49 UTC)
Expired: Jul 17, 2021, 9:12 PM EDT
In force: 23 min
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Forsyth County, NC, Guilford County, NC

The radar

The Roanoke radar (KFCX), 102 km from the middle of the area, began a volume at 00:51 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, 8:52 PM EDT	TSTM WND DMG	4 S Stokesdale, NC	REPORT FROM MPING: TREES UPROOTED OR SNAPPED; ROOF BLOWN OFF. TIME ESTIMATED BY RADAR.
Jul 17, 8:54 PM EDT	TSTM WND DMG	3 Nne Colfax, NC	A TREE WAS REPORTED DOWN NEAR THE INTERSECTION OF NC HIGHWAY 68 AND OAK RIDGE RD. TIME ESTIMATED BY RADAR.
Jul 17, 8:54 PM EDT	TSTM WND DMG	3 S Stokesdale, NC	A TREE WAS REPORTED DOWN ACROSS HIGHWAY 68 NEAR THE INTERSECTION OF CASE RIDGE DR AND NC HIGHWAY 68. TIME ESTIMATED BY RADAR.

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 00:00Z, 0.8 hours before the alert went out and 20 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: 995 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 1335 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

934 
WUUS52 KRAH 180049
SVRRAH
NCC067-081-180130-
/O.NEW.KRAH.SV.W.0087.210718T0049Z-210718T0130Z/

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

The National Weather Service in Raleigh has issued a

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

* Until 930 PM EDT.

* At 848 PM EDT, severe thunderstorms were located along a line
  extending from near Pine Hall to near Kernersville, moving east at
  35 mph.

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

  SOURCE...Radar indicated. At 835 pm, law enforcement reported a 
           tree down on Olivette Chruch Rd.

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

* Locations impacted include...
  Greensboro, Winston-Salem, High Point, Kernersville, Summerfield,
  Stokesdale, Walkertown, Haw River State Park, Lake Jeanette Marina
  and Monticello.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3620 8023 3626 8020 3624 7954 3601 7997
      3603 8017 3603 8021 3601 8022 3609 8025
TIME...MOT...LOC 0048Z 261DEG 31KT 3627 8002 3618 8004 3610 8015 

HAIL...0.88IN
WIND...60MPH
 
$$

Kren

2 follow-up statements

546 
WWUS52 KRAH 180107
SVSRAH

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

NCC067-081-180130-
/O.CON.KRAH.SV.W.0087.000000T0000Z-210718T0130Z/
Forsyth NC-Guilford NC-
907 PM EDT Sat Jul 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR NORTHEASTERN FORSYTH AND NORTHERN GUILFORD COUNTIES...

At 907 PM EDT, severe thunderstorms were located along a line
extending from Bethany to near Monroeton to 8 miles northwest of
Greensboro, moving east at 35 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Greensboro, Winston-Salem, Kernersville, Summerfield, Stokesdale,
Walkertown, Haw River State Park, Lake Jeanette Marina, Monticello
and Belews Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3626 8020 3624 7954 3609 7996 3609 8011
      3611 8020
TIME...MOT...LOC 0107Z 258DEG 32KT 3631 7983 3624 7982 3618 7990 

HAIL...0.88IN
WIND...60MPH
 
$$

Kren

449 
WWUS52 KRAH 180112
SVSRAH

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

NCC067-081-180121-
/O.CAN.KRAH.SV.W.0087.000000T0000Z-210718T0130Z/
Forsyth NC-Guilford NC-
912 PM EDT Sat Jul 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN FORSYTH AND
NORTHERN GUILFORD COUNTIES IS CANCELLED...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been cancelled.  However gusty winds are
still possible with these thunderstorms.

LAT...LON 3626 8020 3624 7954 3609 7996 3609 8011
      3611 8020
TIME...MOT...LOC 0109Z 261DEG 31KT 3631 7981 3624 7980 3618 7988 

$$

Kren

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 8:01 PM EDT	Special Weather Statement	RAH	Forsyth	29 min
Jul 17, 8:10 PM EDT	Severe Thunderstorm Warning	RAH	Davidson, Forsyth	50 min
Jul 17, 9:04 PM EDT	Areal Flood Advisory	RAH	Forsyth, Guilford	46 min
Jul 17, 9:15 PM EDT	Special Weather Statement	RAH	Davidson	30 min
Jul 17, 9:26 PM EDT	Areal Flood Advisory	RAH	Davidson, Forsyth, Guilford	77 min
Jul 17, 9:40 PM EDT	Special Weather Statement	RAH	Guilford	35 min
Jul 17, 9:55 PM EDT	Special Weather Statement	RAH	Person	65 min
Jul 17, 9:59 PM EDT	Severe Thunderstorm Warning	RAH	Granville, Person	46 min
Jul 17, 10:48 PM EDT	Special Weather Statement	RAH	Granville, Vance, Warren	42 min
Jul 18, 5:46 PM EDT	Special Weather Statement	RAH	Cumberland, Hoke, Sampson, Wayne	59 min
Jul 18, 5:54 PM EDT	Special Weather Statement	RAH	Forsyth, Guilford	66 min
Jul 18, 5:58 PM EDT	Special Weather Statement	RAH	Vance, Warren	62 min
Jul 18, 6:29 PM EDT	Special Weather Statement	RAH	Vance, Warren	61 min
Jul 18, 6:31 PM EDT	Special Weather Statement	RAH	Cumberland, Harnett, Hoke, Johnston, Lee, Montgomery and 4 more	59 min
Jul 18, 6:35 PM EDT	Special Weather Statement	RAH	Durham	40 min
Jul 18, 6:51 PM EDT	Severe Thunderstorm Warning	RAH	Granville, Vance, Warren	39 min
Jul 18, 7:35 PM EDT	Special Weather Statement	RAH	Chatham, Davidson, Lee, Moore, Randolph	55 min
Jul 18, 7:51 PM EDT	Special Weather Statement	RAH	Halifax	54 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.