Alert archive / Delaware / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 72, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 9, 2021, 4:37 PM EDT for Kent County, Sussex County, Delaware; Caroline County, Maryland. It was in force for 27 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
- Jun 9, 2021, 4:37 PM EDT (20:37 UTC)
- Expired
- Jun 9, 2021, 5:04 PM EDT
- In force
- 27 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Kent County, DE, Sussex County, DE, Caroline County, MD
The radar
The Dover AFB radar (KDOX), 29 km from the middle of the area, began a volume at 20:37 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, 8.6 hours before the alert went out and 81 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
- 795 J/kg
- Mixed-layer CIN
- -87 J/kg
- Mixed-layer LCL
- 967 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
066
WUUS51 KPHI 092037
SVRPHI
DEC001-005-MDC011-092115-
/O.NEW.KPHI.SV.W.0072.210609T2037Z-210609T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
437 PM EDT Wed Jun 9 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Western Sussex County in southern Delaware...
Southwestern Kent County in central Delaware...
Southeastern Caroline County in eastern Maryland...
* Until 515 PM EDT.
* At 436 PM EDT, a severe thunderstorm was located near Seaford, or 9
miles east of Hurlock, moving southwest at 25 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...
Seaford, Denton, Laurel, Harrington, Federalsburg, Bridgeville,
Delmar, Smithville, Agner, Sycamore, Andrewsville, Blades,
Greenwood, Bethel and Farmington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3846 7560 3846 7569 3864 7571 3869 7577
3868 7578 3868 7580 3887 7587 3893 7555
3857 7539 3845 7555
TIME...MOT...LOC 2036Z 047DEG 24KT 3864 7570
HAIL...0.75IN
WIND...60MPH
$$
Davis2 follow-up statements
645
WWUS51 KPHI 092055
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
455 PM EDT Wed Jun 9 2021
DEC001-005-MDC011-092115-
/O.CON.KPHI.SV.W.0072.000000T0000Z-210609T2115Z/
Sussex DE-Kent DE-Caroline MD-
455 PM EDT Wed Jun 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR SOUTHWESTERN SUSSEX...SOUTHWESTERN KENT AND SOUTHEASTERN CAROLINE
COUNTIES...
At 454 PM EDT, a severe thunderstorm was located near Vienna, or near
Hurlock, moving southwest at 30 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Seaford, Laurel, Federalsburg, Bridgeville, Delmar, Agner,
Smithville, Andrewsville, Blades and Bethel.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3846 7560 3846 7569 3864 7571 3869 7577
3868 7578 3868 7580 3884 7586 3889 7563
3849 7550 3845 7555
TIME...MOT...LOC 2054Z 047DEG 24KT 3855 7582
HAIL...0.75IN
WIND...60MPH
$$
Davis499
WWUS51 KPHI 092104
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
504 PM EDT Wed Jun 9 2021
DEC001-005-MDC011-092113-
/O.CAN.KPHI.SV.W.0072.000000T0000Z-210609T2115Z/
Sussex DE-Kent DE-Caroline MD-
504 PM EDT Wed Jun 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SUSSEX...
SOUTHWESTERN KENT AND SOUTHEASTERN CAROLINE COUNTIES IS CANCELLED...
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 has been cancelled. However heavy rain is
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 3846 7560 3846 7569 3864 7571 3869 7577
3868 7578 3868 7580 3884 7586 3889 7563
3849 7550 3845 7555
TIME...MOT...LOC 2102Z 047DEG 24KT 3851 7588
$$
FitzsimmonsThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 8:15 PM EDT | Special Weather Statement | PHI | Sussex | 45 min |
| Jun 9, 7:54 AM EDT | River Flood Warning | PHI | New Castle | 5 hr |
| Jun 9, 1:35 PM EDT | Special Weather Statement | PHI | New Castle | 25 min |
| Jun 9, 2:07 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 23 min |
| Jun 9, 2:21 PM EDT | Flash Flood Warning | PHI | New Castle | 73 min |
| Jun 9, 2:26 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 64 min |
| Jun 9, 2:28 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 62 min |
| Jun 9, 3:11 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 64 min |
| Jun 9, 3:24 PM EDT | Areal Flood Advisory | PHI | Sussex | 3 hr |
| Jun 9, 4:32 PM EDT | Areal Flood Advisory | PHI | Sussex | 108 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2021Severe Thunderstorm Warnings in Maryland, 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.