Alert archive / Maryland / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 98, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 21, 2021, 6:47 PM EDT for 4 counties in Maryland; Kent County, New Castle County, Delaware. It was in force for 58 min. 9 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
- Jun 21, 2021, 6:47 PM EDT (22:47 UTC)
- Expired
- Jun 21, 2021, 7:45 PM EDT
- In force
- 58 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, Caroline County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 62 km from the middle of the area, began a volume at 22:48 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, 7:07 PM EDT | TSTM WND GST 56 | New Castle County Airpo, DE | |
| Jun 21, 7:09 PM EDT | TSTM WND DMG | 2 Sw Still Pond, MD | DOWNED POWER LINES NEAR CLARK ROAD. TIME ESTIMATED FROM RADAR. |
| Jun 21, 7:13 PM EDT | TSTM WND DMG | New Castle, DE | DOWNED WIRES NEAR SECOND STREET. TIME ESTIMATED FROM RADAR. |
| Jun 21, 7:15 PM EDT | TSTM WND DMG | 5 Nne Kennedyville, MD | DOWNED POWER LINES NEAR BELCHESTER ROAD. TIME ESTIMATED FROM RADAR. |
| Jun 21, 7:15 PM EDT | TSTM WND DMG | Glendale, DE | SEVERAL REPORTS OF DOWNED TREE LIMBS AND POWER LINES IN THE AREA. TIME ESTIMATED FROM RADAR. |
| Jun 21, 7:20 PM EDT | TSTM WND DMG | Middletown, DE | SOME LARGE LIMBS BLOWN DOWN IN THE MIDDLETOWN DE AREA. TIME ESTIMATED FROM RADAR. |
| Jun 21, 7:23 PM EDT | TSTM WND DMG | Chestertown, MD | DOWNED POWER LINES NEAR WALDO DRIVE. TIME ESTIMATED FROM RADAR. |
| Jun 21, 7:29 PM EDT | TSTM WND DMG | 2 Nne Mcdonough, DE | DOWNED POWER LINES NEAR PORT PENN ROAD. TIME ESTIMATED FROM RADAR. |
| 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.8 hours before the alert went out and 113 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
- 329 J/kg
- Mixed-layer CIN
- -164 J/kg
- Mixed-layer LCL
- 801 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
641
WUUS51 KPHI 212247
SVRPHI
DEC001-003-MDC011-029-035-041-212345-
/O.NEW.KPHI.SV.W.0098.210621T2247Z-210621T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
647 PM EDT Mon Jun 21 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
New Castle County in northern Delaware...
Kent County in central Delaware...
Northern Talbot County in eastern Maryland...
Queen Anne's County in northeastern Maryland...
Caroline County in eastern Maryland...
Kent County in northeastern Maryland...
* Until 745 PM EDT.
* At 647 PM EDT, severe thunderstorms were located along a line
extending from near Octoraro to Kettering, moving east at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Dover, Newark, Middletown, Easton, Centerville, Talbot, Pennsville,
Smyrna, New Castle, Chestertown, Denton, Centreville, Harrington,
Romancoke, Camden, Clayton, Greensboro, Oakland, Delaware City and
Ridgely.
This includes Interstate 95 in Delaware between mile markers 0 and 6.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3902 7632 3900 7617 3901 7620 3916 7628
3926 7621 3938 7606 3938 7577 3965 7579
3971 7553 3916 7545 3884 7555 3874 7609
3877 7632 3878 7633 3886 7626 3879 7620
3879 7619 3897 7625 3884 7637 3885 7638
TIME...MOT...LOC 2247Z 273DEG 23KT 3964 7620 3887 7679
HAIL...<.75IN
WIND...60MPH
$$
NC1 follow-up statement
404
WWUS51 KPHI 212328
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
728 PM EDT Mon Jun 21 2021
DEC001-003-MDC011-029-035-041-212345-
/O.CON.KPHI.SV.W.0098.000000T0000Z-210621T2345Z/
New Castle DE-Kent DE-Talbot MD-Queen Anne's MD-Caroline MD-Kent MD-
728 PM EDT Mon Jun 21 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR NEW CASTLE...KENT...NORTHERN TALBOT...QUEEN ANNE'S...CENTRAL
CAROLINE AND NORTHEASTERN KENT COUNTIES...
At 728 PM EDT, severe thunderstorms were located along a line
extending from Glasgow to near Talbot, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Dover, Newark, Middletown, Centerville, Talbot, Smyrna, New Castle,
Chestertown, Denton, Centreville, Harrington, Camden, Clayton,
Greensboro, Oakland, Delaware City, Ridgely, Cheswold, Church Hill
and Millington.
This includes Interstate 95 in Delaware between mile markers 0 and 6.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3885 7627 3882 7624 3883 7619 3895 7623
3900 7617 3902 7619 3937 7598 3938 7577
3965 7579 3971 7553 3962 7556 3958 7551
3954 7554 3950 7550 3950 7554 3946 7554
3945 7549 3915 7545 3884 7555 3881 7630
TIME...MOT...LOC 2328Z 276DEG 35KT 3960 7572 3883 7631
HAIL...<.75IN
WIND...60MPH
$$
FitzsimmonsThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 7:43 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's | 47 min |
| 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, 7:12 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 48 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 2021Severe 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.