Alert archive / Delaware / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 102, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 21, 2021, 7:43 PM EDT for Kent County, New Castle County, Sussex County, Delaware; Cumberland County, Salem County, New Jersey; Caroline County, Kent County, Queen Anne's County, Maryland. It was in force for 47 min. 1 report 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
- Jun 21, 2021, 7:43 PM EDT (23:43 UTC)
- Expired
- Jun 21, 2021, 8:30 PM EDT
- In force
- 47 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Kent County, MD, Queen Anne's County, MD, Cumberland County, NJ, Salem County, NJ
The radar
The Dover AFB radar (KDOX), 30 km from the middle of the area, began a volume at 23:43 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 |
|---|---|---|---|
| Jun 21, 7:45 PM EDT | TSTM WND DMG | 2 Se Delaney Corner, DE | DOWNED TREE ON WIRES NEAR LONGRIDGE ROAD. TIME ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 21, 4:33 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 11.7 hours before the alert went out and 129 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
- 525 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 630 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- -14 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
762
WUUS51 KPHI 212343
SVRPHI
DEC001-003-005-MDC011-029-035-NJC011-033-220030-
/O.NEW.KPHI.SV.W.0102.210621T2343Z-210622T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
743 PM EDT Mon Jun 21 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northern Sussex County in southern Delaware...
South central New Castle County in northern Delaware...
Kent County in central Delaware...
Eastern Queen Anne's County in northeastern Maryland...
Northeastern Caroline County in eastern Maryland...
East central Kent County in northeastern Maryland...
Southwestern Cumberland County in southern New Jersey...
Southwestern Salem County in southern New Jersey...
* Until 830 PM EDT.
* At 743 PM EDT, a cluser of severe thunderstorms were located over
Sudlersville, or 16 miles west of Dover, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Dover, Centerville, Smyrna, Milford, Denton, Centreville,
Harrington, Camden, Clayton, Lewes, Greensboro, Oakland, Ridgely,
Cheswold, Greenwich, Sudlersville, Ellendale, Bowers, Goldsboro and
Woodside.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3904 7607 3949 7555 3935 7508 3924 7496
3879 7512 3879 7546 3893 7595
TIME...MOT...LOC 2343Z 269DEG 41KT 3918 7582
HAIL...<.75IN
WIND...60MPH
$$
NC2 follow-up statements
844
WWUS51 KPHI 220015
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
815 PM EDT Mon Jun 21 2021
DEC003-NJC033-220024-
/O.CAN.KPHI.SV.W.0102.000000T0000Z-210622T0030Z/
New Castle DE-Salem NJ-
815 PM EDT Mon Jun 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL NEW CASTLE AND
SOUTHWESTERN SALEM COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until midnight EDT for
central, northern and southern Delaware...eastern and northeastern
Maryland...and southern New Jersey.
LAT...LON 3893 7595 3898 7594 3910 7584 3915 7575
3925 7576 3925 7582 3930 7577 3929 7565
3931 7558 3935 7555 3935 7508 3924 7496
3879 7512 3879 7546
TIME...MOT...LOC 0014Z 269DEG 41KT 3919 7536
$$
DEC001-005-MDC011-029-035-NJC011-220030-
/O.CON.KPHI.SV.W.0102.000000T0000Z-210622T0030Z/
Sussex DE-Kent DE-Queen Anne's MD-Caroline MD-Kent MD-Cumberland NJ-
815 PM EDT Mon Jun 21 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR NORTHERN SUSSEX...KENT...SOUTHEASTERN QUEEN ANNE'S...NORTHEASTERN
CAROLINE...EASTERN KENT AND SOUTHWESTERN CUMBERLAND COUNTIES...
At 814 PM EDT, a cluser of severe thunderstorms were located 8 miles
northeast of Dover Base Housing, or 8 miles east of Dover, moving
east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Dover, Smyrna, Milford, Denton, Harrington, Camden, Clayton, Lewes,
Greensboro, Oakland, Ridgely, Cheswold, Ellendale, Bowers, Goldsboro,
Woodside, Viola, Hartly, Hazlettville and Dover Speedway.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3893 7595 3898 7594 3910 7584 3915 7575
3925 7576 3925 7582 3930 7577 3929 7565
3931 7558 3935 7555 3935 7508 3924 7496
3879 7512 3879 7546
TIME...MOT...LOC 0014Z 269DEG 41KT 3919 7536
HAIL...<.75IN
WIND...60MPH
$$
NC609
WWUS51 KPHI 220023
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
823 PM EDT Mon Jun 21 2021
DEC001-005-MDC011-029-035-NJC011-220033-
/O.EXP.KPHI.SV.W.0102.000000T0000Z-210622T0030Z/
Sussex DE-Kent DE-Queen Anne's MD-Caroline MD-Kent MD-Cumberland NJ-
823 PM EDT Mon Jun 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN SUSSEX...KENT...
SOUTHEASTERN QUEEN ANNE'S...NORTHEASTERN CAROLINE...EASTERN KENT AND
SOUTHWESTERN CUMBERLAND COUNTIES WILL EXPIRE AT 830 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire. However gusty winds are still possible with
this thunderstorm.
A Severe Thunderstorm Watch remains in effect until midnight EDT for
central, northern and southern Delaware...eastern and northeastern
Maryland...and southern New Jersey.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 3893 7595 3898 7594 3910 7584 3915 7575
3925 7576 3925 7582 3930 7577 3929 7565
3931 7558 3935 7555 3935 7508 3924 7496
3879 7512 3879 7546
TIME...MOT...LOC 0023Z 269DEG 41KT 3919 7535
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 4:35 AM EDT | Heat Advisory | PHI | New Castle | 15 hr |
| Jun 21, 6:21 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 54 min |
| Jun 21, 6:47 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 58 min |
| Jun 21, 7:12 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 48 min |
| Jun 21, 7:24 PM EDT | Special Marine Warning | PHI | 66 min | |
| Jun 21, 7:38 PM EDT | Severe Thunderstorm Warning | PHI | Warren | 52 min |
| Jun 21, 7:55 PM EDT | Special Weather Statement | PHI | Atlantic, Burlington, Camden, Mercer, Ocean | 50 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2021Severe Thunderstorm Warnings in Maryland, 2021Severe Thunderstorm Warnings in New Jersey, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.