Alert archive / Delaware / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 271, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 28, 2020, 3:21 PM EDT for Kent County, New Castle County, Delaware. It was in force for 24 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
- Aug 28, 2020, 3:21 PM EDT (19:21 UTC)
- Expired
- Aug 28, 2020, 3:45 PM EDT
- In force
- 24 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 2.0 in
- Wind
- 70.0 mph
Counties Kent County, DE, New Castle County, DE
The radar
The Dover AFB radar (KDOX), 49 km from the middle of the area, began a volume at 19:23 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, 3:25 PM EDT | TSTM WND DMG | Woodland Beach, DE | DOWNED TREE LIMBS AND POWER LINES REPORTED IN THE WOODLAND BEACH 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
Wallops Is Stn, VA (KWAL), launched 12:00Z, 7.4 hours before the alert went out and 148 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
- 264 J/kg
- Mixed-layer CIN
- -171 J/kg
- Mixed-layer LCL
- 1367 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
594
WUUS51 KPHI 281921
SVRPHI
DEC001-003-281945-
/O.NEW.KPHI.SV.W.0271.200828T1921Z-200828T1945Z/
BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
321 PM EDT Fri Aug 28 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
South central New Castle County in northern Delaware...
Northeastern Kent County in central Delaware...
* Until 345 PM EDT.
* At 320 PM EDT, a severe thunderstorm was located near Smyrna, or 10
miles north of Dover, moving east at 30 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...
Dover, Smyrna, Clayton, Cheswold, Woodland Beach, Little Creek and
Leipsic.
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 3926 7565 3940 7555 3936 7547 3926 7539
3917 7538 3911 7540
TIME...MOT...LOC 1920Z 290DEG 26KT 3931 7555
HAIL...2.00IN
WIND...70MPH
$$
Staarmann2 follow-up statements
370
WWUS51 KPHI 281934
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
334 PM EDT Fri Aug 28 2020
DEC003-281943-
/O.CAN.KPHI.SV.W.0271.000000T0000Z-200828T1945Z/
New Castle DE-
334 PM EDT Fri Aug 28 2020
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL NEW CASTLE
COUNTY IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
central Delaware.
LAT...LON 3934 7545 3926 7539 3917 7538 3911 7540
3923 7561 3925 7563 3926 7563
TIME...MOT...LOC 1933Z 293DEG 25KT 3926 7546
$$
DEC001-281945-
/O.CON.KPHI.SV.W.0271.000000T0000Z-200828T1945Z/
Kent DE-
334 PM EDT Fri Aug 28 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR NORTHEASTERN KENT COUNTY...
At 333 PM EDT, a severe thunderstorm was located near Woodland Beach,
or 7 miles northeast of Dover, moving southeast at 30 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...
Dover, Cheswold, Little Creek and Leipsic.
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 3934 7545 3926 7539 3917 7538 3911 7540
3923 7561 3925 7563 3926 7563
TIME...MOT...LOC 1933Z 293DEG 25KT 3926 7546
HAIL...2.00IN
WIND...70MPH
$$
Staarmann242
WWUS51 KPHI 281942
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
342 PM EDT Fri Aug 28 2020
DEC001-281952-
/O.EXP.KPHI.SV.W.0271.000000T0000Z-200828T1945Z/
Kent DE-
342 PM EDT Fri Aug 28 2020
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KENT COUNTY WILL
EXPIRE AT 345 PM EDT...
The storm which prompted the warning has moved out of the area over
Delaware Bay. Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
central Delaware.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 3934 7545 3926 7539 3917 7538 3911 7540
3923 7561 3925 7563 3926 7563
TIME...MOT...LOC 1942Z 290DEG 25KT 3924 7540
$$
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 | New Castle | 52 min |
| Aug 28, 2:40 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 50 min |
| Aug 28, 3:15 PM EDT | Special Weather Statement | PHI | New Castle | 30 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, 4:01 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 44 min |
| Aug 28, 4:39 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 66 min |
| Aug 28, 5:40 PM EDT | Special Weather Statement | PHI | Kent | 35 min |
| Aug 28, 6:17 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 43 min |
| Aug 28, 7:53 PM EDT | Special Weather Statement | PHI | Sussex | 37 min |
Nearby
Severe 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.