Alert archive / Delaware / Tornado Warnings in 2020
Tornado Warning 14, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this tornado warning at Aug 4, 2020, 7:51 AM EDT for Sussex County, Delaware. It was in force for 24 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
- Aug 4, 2020, 7:51 AM EDT (11:51 UTC)
- Expired
- Aug 4, 2020, 8:15 AM EDT
- In force
- 24 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 29 km from the middle of the area, began a volume at 11:55 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 4, 2:26 AM EDT | Tornado Watch | SPC | 9 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 00:00Z, 11.9 hours before the alert went out and 73 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
- 920 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 841 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.5
The text
As transmitted.
767
WFUS51 KPHI 041151
TORPHI
DEC005-041215-
/O.NEW.KPHI.TO.W.0014.200804T1151Z-200804T1215Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
751 AM EDT Tue Aug 4 2020
The National Weather Service in Mount Holly NJ has issued a
* Tornado Warning for...
Central Sussex County in southern Delaware...
* Until 815 AM EDT.
* At 751 AM EDT, a severe thunderstorm capable of producing a tornado
was located near Selbyville, or 13 miles northwest of Ocean City,
moving north at 55 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* Locations impacted include...
Georgetown, Millsboro, Lewes, Milton, Dagsboro, Gumboro and
Frankford.
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.
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 3846 7541 3884 7539 3884 7512 3845 7524
3845 7538
TIME...MOT...LOC 1151Z 182DEG 47KT 3845 7530
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
SFJ1 follow-up statement
180
WWUS51 KPHI 041200
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
800 AM EDT Tue Aug 4 2020
DEC005-041215-
/O.CON.KPHI.TO.W.0014.000000T0000Z-200804T1215Z/
Sussex DE-
800 AM EDT Tue Aug 4 2020
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 AM EDT FOR CENTRAL
SUSSEX COUNTY...
At 800 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Millsboro, or 9 miles southeast of Georgetown,
moving north at 55 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Georgetown, Millsboro, Lewes, Milton, Dagsboro and Frankford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 3850 7540 3884 7539 3884 7512 3849 7523
3848 7523
TIME...MOT...LOC 1200Z 182DEG 47KT 3858 7529
TORNADO...RADAR INDICATED
HAIL...0.00IN
$$
SFJThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 4:50 AM EDT | Tornado Warning | PHI | Sussex | 25 min |
| Aug 4, 5:17 AM EDT | Areal Flood Advisory | PHI | New Castle | 4 hr |
| Aug 4, 7:28 AM EDT | Flash Flood Warning | PHI | New Castle | 3 hr |
| Aug 4, 7:39 AM EDT | Tornado Warning | PHI | Sussex | 36 min |
| Aug 4, 8:15 AM EDT | Tornado Warning | PHI | Kent | 45 min |
| Aug 4, 8:18 AM EDT | Tornado Warning | PHI | Sussex | 27 min |
| Aug 4, 8:27 AM EDT | Tornado Warning | PHI | Kent | 33 min |
| Aug 4, 8:56 AM EDT | Tornado Warning | PHI | Kent, New Castle | 34 min |
| Aug 4, 8:58 AM EDT | Flash Flood Warning | PHI | Kent, New Castle, Sussex | 3 hr |
| Aug 4, 9:06 AM EDT | River Flood Warning | PHI | New Castle | 11 hr |
| Aug 4, 9:23 AM EDT | Flash Flood Warning | PHI | New Castle | 4 hr |
| Aug 4, 9:23 AM EDT | Tornado Warning | PHI | New Castle | 22 min |
| Aug 4, 10:02 AM EDT | Flash Flood Warning | PHI | New Castle | 4 hr |
| Aug 4, 10:38 AM EDT | River Flood Warning | PHI | New Castle | 14 hr |
| Aug 4, 12:27 PM EDT | River Flood Warning | PHI | New Castle | 10 hr |
| Aug 4, 12:48 PM EDT | River Flood Warning | PHI | New Castle | 24 hr |
| Aug 4, 1:59 PM EDT | Areal Flood Warning | PHI | New Castle | 9 hr |
Nearby
Tornado Warnings in Delaware, 2020Every tornado warning in 2020Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.