Alert archive / Maryland / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 270, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 28, 2020, 2:40 PM EDT for Cecil County, Kent County, Maryland; Kent County, New Castle County, Delaware. It was in force for 50 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
- Aug 28, 2020, 2:40 PM EDT (18:40 UTC)
- Expired
- Aug 28, 2020, 3:30 PM EDT
- In force
- 50 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 60.0 mph
Counties Kent County, DE, New Castle County, DE, Cecil County, MD, Kent County, MD
The radar
The Dover AFB radar (KDOX), 68 km from the middle of the area, began a volume at 18:43 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 |
|---|---|---|---|
| Aug 28, 2:43 PM EDT | TSTM WND DMG | Cecilton, MD | SEVERAL REPORTS OF DOWNED TREES AND WIRES IN THE CECILTON AREA. TIME ESTIMATED FROM RADAR. |
| Aug 28, 2:45 PM EDT | TSTM WND DMG | Warwick, MD | SEVERAL REPORTS OF DOWNED TREES AND WIRES IN THE WARWICK AREA. 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 |
|---|---|---|---|
| Aug 28, 1:37 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 6.7 hours before the alert went out and 152 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
- 511 J/kg
- Mixed-layer CIN
- -119 J/kg
- Mixed-layer LCL
- 1109 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 102 m²/s²
- 0-3 km storm-relative helicity
- 50 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
207
WUUS51 KPHI 281840
SVRPHI
DEC001-003-MDC015-029-281930-
/O.NEW.KPHI.SV.W.0270.200828T1840Z-200828T1930Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
240 PM EDT Fri Aug 28 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southwestern New Castle County in northern Delaware...
Northwestern Kent County in central Delaware...
Northeastern Kent County in northeastern Maryland...
Southeastern Cecil County in northeastern Maryland...
* Until 330 PM EDT.
* At 240 PM EDT, a severe thunderstorm was located over Warwick, or
near Middletown, moving east at 25 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Wind
damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Middletown, Smyrna, Clayton, Cheswold, Cecilton, Warwick,
Sassafras, Green Spring, Bohemias Mills, Delaney Corner, Cayots,
Townsend, Odessa and Chambersville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.
In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.
&&
LAT...LON 3941 7595 3951 7585 3947 7557 3937 7548
3920 7557
TIME...MOT...LOC 1840Z 290DEG 21KT 3943 7582
HAIL...1.50IN
WIND...60MPH
$$
Staarmann3 follow-up statements
705
WWUS51 KPHI 281851
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
251 PM EDT Fri Aug 28 2020
DEC001-003-MDC015-029-281930-
/O.CON.KPHI.SV.W.0270.000000T0000Z-200828T1930Z/
New Castle DE-Kent DE-Kent MD-Cecil MD-
251 PM EDT Fri Aug 28 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR SOUTHWESTERN NEW CASTLE...NORTHWESTERN KENT...NORTHEASTERN KENT
AND SOUTHEASTERN CECIL COUNTIES...
At 250 PM EDT, a severe thunderstorm was located over Warwick, or
near Middletown, moving east at 25 mph.
HAZARD...Two inch hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Wind damage
to roofs, siding, trees, and power lines is possible.
Locations impacted include...
Middletown, Smyrna, Clayton, Cheswold, Warwick, Sassafras, Delaney
Corner, Green Spring, Townsend, Odessa and Chambersville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
Prepare immediately for large hail and damaging winds. People outside
should seek shelter inside a well-built structure and away from
windows.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
&&
LAT...LON 3944 7582 3947 7572 3945 7555 3937 7548
3920 7557 3936 7586
TIME...MOT...LOC 1850Z 290DEG 21KT 3941 7575
HAIL...2.00IN
WIND...60MPH
$$
Staarmann887
WWUS51 KPHI 281901
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
301 PM EDT Fri Aug 28 2020
MDC015-029-281911-
/O.CAN.KPHI.SV.W.0270.000000T0000Z-200828T1930Z/
Kent MD-Cecil MD-
301 PM EDT Fri Aug 28 2020
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KENT AND
SOUTHEASTERN CECIL 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 800 PM EDT for
central and northern Delaware.
LAT...LON 3944 7569 3942 7552 3937 7548 3920 7557
3931 7576 3939 7576
TIME...MOT...LOC 1901Z 290DEG 24KT 3936 7568
$$
DEC001-003-281930-
/O.CON.KPHI.SV.W.0270.000000T0000Z-200828T1930Z/
New Castle DE-Kent DE-
301 PM EDT Fri Aug 28 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR SOUTHWESTERN NEW CASTLE AND NORTHWESTERN KENT COUNTIES...
At 301 PM EDT, a severe thunderstorm was located near Green Spring,
or near Middletown, moving east at 30 mph.
HAZARD...Two inch hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Wind damage
to roofs, siding, trees, and power lines is possible.
Locations impacted include...
Smyrna, Clayton, Cheswold, Green Spring, Townsend and Chambersville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
Prepare immediately for large hail and damaging winds. People outside
should seek shelter inside a well-built structure and away from
windows.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
&&
LAT...LON 3944 7569 3942 7552 3937 7548 3920 7557
3931 7576 3939 7576
TIME...MOT...LOC 1901Z 290DEG 24KT 3936 7568
HAIL...2.00IN
WIND...60MPH
$$
Staarmann496
WWUS51 KPHI 281922
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
322 PM EDT Fri Aug 28 2020
DEC001-003-281930-
/O.CON.KPHI.SV.W.0270.000000T0000Z-200828T1930Z/
New Castle DE-Kent DE-
322 PM EDT Fri Aug 28 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR SOUTHEASTERN NEW CASTLE AND NORTH CENTRAL KENT COUNTIES...
At 322 PM EDT, a severe thunderstorm was located near Woodland Beach,
or 10 miles north of Dover, moving east at 25 mph.
HAZARD...Two inch hail and 70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect
considerable tree damage. Wind damage is also likely to
mobile homes, roofs, and outbuildings.
Locations impacted include...
Smyrna.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
Prepare immediately for large hail and damaging winds. People outside
should seek shelter inside a well-built structure and away from
windows.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
&&
LAT...LON 3937 7556 3938 7548 3933 7550 3923 7556
3926 7563
TIME...MOT...LOC 1922Z 290DEG 21KT 3932 7553
HAIL...2.00IN
WIND...70MPH
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 1:53 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 52 min |
| Aug 28, 4:01 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 44 min |
| Aug 28, 4:39 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 66 min |
| Aug 28, 6:17 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 43 min |
| Aug 28, 3:15 PM EDT | Special Weather Statement | PHI | New Castle | 30 min |
| Aug 28, 3:21 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 24 min |
| Aug 28, 3:41 PM EDT | Special Weather Statement | PHI | New Castle | 34 min |
| Aug 28, 3:52 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 53 min |
| Aug 28, 5:40 PM EDT | Special Weather Statement | PHI | Kent | 35 min |
| Aug 28, 7:53 PM EDT | Special Weather Statement | PHI | Sussex | 37 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 2020Severe Thunderstorm Warnings in Delaware, 2020Every severe thunderstorm warning in 2020
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.