Alert archive / Delaware / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 262, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 13, 2021, 6:53 PM EDT for Sussex County, Delaware. It was in force for 37 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 13, 2021, 6:53 PM EDT (22:53 UTC)
- Expired
- Aug 13, 2021, 7:30 PM EDT
- In force
- 37 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 20 km from the middle of the area, began a volume at 22:53 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
Wallops Is Stn, VA (KWAL), launched 12:00Z, 10.9 hours before the alert went out and 80 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
- 809 J/kg
- Mixed-layer CIN
- -190 J/kg
- Mixed-layer LCL
- 1510 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
393
WUUS51 KPHI 132253
SVRPHI
DEC005-132330-
/O.NEW.KPHI.SV.W.0262.210813T2253Z-210813T2330Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
653 PM EDT Fri Aug 13 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southern Sussex County in southern Delaware...
* Until 730 PM EDT.
* At 653 PM EDT, a severe thunderstorm was located near Sycamore, or
near Georgetown, moving southeast at 10 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Georgetown, Seaford, Millsboro, Laurel, Bridgeville, Sycamore,
Blades, Greenwood and Bethel.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3855 7560 3870 7572 3882 7559 3879 7541
3871 7520 3857 7529 3848 7544
TIME...MOT...LOC 2253Z 301DEG 8KT 3867 7550
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
NC2 follow-up statements
116
WWUS51 KPHI 132312
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
712 PM EDT Fri Aug 13 2021
DEC005-132330-
/O.CON.KPHI.SV.W.0262.000000T0000Z-210813T2330Z/
Sussex DE-
712 PM EDT Fri Aug 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR CENTRAL SUSSEX COUNTY...
At 711 PM EDT, a severe thunderstorm was located near Sycamore, or
near Georgetown, moving southeast at 10 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Georgetown, Seaford, Millsboro, Bridgeville, Sycamore, Blades and
Greenwood.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3857 7554 3868 7566 3881 7559 3879 7541
3871 7520 3857 7530 3853 7541
TIME...MOT...LOC 2311Z 301DEG 8KT 3865 7546
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
PO366
WWUS51 KPHI 132327
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
727 PM EDT Fri Aug 13 2021
DEC005-132337-
/O.EXP.KPHI.SV.W.0262.000000T0000Z-210813T2330Z/
Sussex DE-
727 PM EDT Fri Aug 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SUSSEX COUNTY WILL
EXPIRE AT 730 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with this thunderstorm.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 3857 7554 3868 7566 3881 7559 3879 7541
3871 7520 3857 7530 3853 7541
TIME...MOT...LOC 2327Z 301DEG 8KT 3905 7572
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 3:21 PM EDT | Special Weather Statement | PHI | Sussex | 24 min |
| Aug 13, 6:04 PM EDT | Special Weather Statement | PHI | Sussex | 26 min |
| Aug 13, 6:45 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 30 min |
| Aug 13, 6:47 PM EDT | Special Weather Statement | PHI | Sussex | 43 min |
| Aug 13, 7:12 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 33 min |
| Aug 13, 7:30 PM EDT | Special Weather Statement | PHI | Sussex | 45 min |
| Aug 13, 7:43 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 47 min |
| Aug 13, 7:57 PM EDT | Areal Flood Advisory | PHI | Kent, Sussex | 93 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.