Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 47, NWS Raleigh, NC

May 4, 20214 counties in North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at May 4, 2021, 3:46 PM EDT for 4 counties in North Carolina. It was in force for 44 min. 2 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: May 4, 2021, 3:46 PM EDT (19:46 UTC)
Expired: May 4, 2021, 4:30 PM EDT
In force: 44 min
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Durham County, NC, Granville County, NC, Orange County, NC, Person County, NC

The radar

The Raleigh/Durham radar (KRAX), 72 km from the middle of the area, began a volume at 19:50 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
May 4, 3:55 PM EDT	TSTM WND DMG	4 Ese Hillsborough, NC	TREE DOWN NEAR LINDEN ROAD. TIME ESTIMATED BY RADAR.
May 4, 4:10 PM EDT	TSTM WND DMG	4 Nnw Chapel Hill, NC	TREE DOWN ON THE 7000 BLOCK OF NC HIGHWAY 86 N.

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, 7.8 hours before the alert went out and 99 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: 463 J/kg
Mixed-layer CIN: -235 J/kg
Mixed-layer LCL: 935 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

557 
WUUS52 KRAH 041946
SVRRAH
NCC063-077-135-145-042030-
/O.NEW.KRAH.SV.W.0047.210504T1946Z-210504T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Raleigh NC
346 PM EDT Tue May 4 2021

The National Weather Service in Raleigh has issued a

* Severe Thunderstorm Warning for...
  Southern Person County in central North Carolina...
  Northeastern Orange County in central North Carolina...
  Western Granville County in central North Carolina...
  Northern Durham County in central North Carolina...

* Until 430 PM EDT.

* At 346 PM EDT, a severe thunderstorm was located near Hillsborough,
  moving northeast at 35 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Durham, Oxford, Hillsborough, Creedmoor, Butner, Rougemont, Stem,
  Lake Michie, Eno River State Park and Bahama.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 3644 7863 3612 7855 3596 7912 3632 7914
TIME...MOT...LOC 1946Z 245DEG 30KT 3609 7904 

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

JD

2 follow-up statements

638 
WWUS52 KRAH 042011
SVSRAH

Severe Weather Statement
National Weather Service Raleigh NC
411 PM EDT Tue May 4 2021

NCC135-145-042020-
/O.CAN.KRAH.SV.W.0047.000000T0000Z-210504T2030Z/
Person NC-Orange NC-
411 PM EDT Tue May 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN PERSON AND
NORTHEASTERN ORANGE COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 3644 7863 3612 7855 3607 7875 3606 7875
      3600 7899 3624 7895 3624 7880 3640 7880
TIME...MOT...LOC 2010Z 266DEG 31KT 3631 7874 3616 7877 3603 7891 

$$

NCC063-077-042030-
/O.CON.KRAH.SV.W.0047.000000T0000Z-210504T2030Z/
Granville NC-Durham NC-
411 PM EDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR WESTERN GRANVILLE AND NORTHERN DURHAM COUNTIES...

At 410 PM EDT, severe thunderstorms were located along a line
extending from 8 miles west of Oxford to Butner to near Durham,
moving east at 35 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Durham, Oxford, Creedmoor, Butner, Rougemont, Stem, Lake Michie, Lake
Butner, Berea and Bahama.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 3644 7863 3612 7855 3607 7875 3606 7875
      3600 7899 3624 7895 3624 7880 3640 7880
TIME...MOT...LOC 2010Z 266DEG 31KT 3631 7874 3616 7877 3603 7891 

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

JD

246 
WWUS52 KRAH 042027
SVSRAH

Severe Weather Statement
National Weather Service Raleigh NC
427 PM EDT Tue May 4 2021

NCC063-077-042036-
/O.EXP.KRAH.SV.W.0047.000000T0000Z-210504T2030Z/
Granville NC-Durham NC-
427 PM EDT Tue May 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN GRANVILLE AND NORTHERN
DURHAM COUNTIES WILL EXPIRE AT 430 PM EDT...
    
The storms which prompted the warning have weakened below severe 
limits, and have exited much of the warned area. Therefore, the 
warning will be allowed to expire.  However gusty winds are still 
possible with these thunderstorms.

LAT...LON 3644 7863 3612 7855 3607 7875 3606 7875
      3600 7899 3624 7895 3624 7880 3640 7880
TIME...MOT...LOC 2026Z 245DEG 30KT 3636 7860 3621 7863 3608 7877 

$$

JD

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 2:38 PM EDT	Special Weather Statement	RAH	Alamance, Guilford, Randolph	67 min
May 4, 3:02 PM EDT	Special Weather Statement	RAH	Forsyth	58 min
May 4, 3:19 PM EDT	Severe Thunderstorm Warning	RAH	Alamance, Guilford	40 min
May 4, 3:57 PM EDT	Special Weather Statement	RAH	Montgomery, Stanly	63 min
May 4, 4:02 PM EDT	Special Weather Statement	RAH	Wayne	58 min
May 4, 4:20 PM EDT	Special Weather Statement	RAH	Person	55 min
May 4, 4:30 PM EDT	Special Weather Statement	RAH	Franklin, Vance	60 min
May 4, 4:44 PM EDT	Special Weather Statement	RAH	Anson, Richmond	61 min
May 4, 4:58 PM EDT	Special Weather Statement	RAH	Chatham, Lee	62 min
May 4, 5:06 PM EDT	Special Weather Statement	RAH	Nash	54 min
May 4, 5:30 PM EDT	Special Weather Statement	RAH	Edgecombe	30 min
May 4, 5:37 PM EDT	Severe Thunderstorm Warning	RAH	Anson, Richmond, Scotland	53 min
May 4, 6:14 PM EDT	Severe Thunderstorm Warning	RAH	Cumberland, Harnett, Hoke, Moore	61 min
May 4, 7:11 PM EDT	Special Weather Statement	RAH	Johnston, Wayne	64 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.