Alert archive / Delaware / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 204, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 4, 2020, 8:21 PM EDT for Kent County, Sussex County, Delaware; Caroline County, Talbot County, Maryland. It was in force for 39 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, 8:21 PM EDT (00:21 UTC)
- Expired
- Aug 4, 2020, 9:00 PM EDT
- In force
- 39 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Kent County, DE, Sussex County, DE, Caroline County, MD, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 35 km from the middle of the area, began a volume at 00:22 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 nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 00:00Z, 0.4 hours before the alert went out and 110 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
- 272 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 1064 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 84 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.4
The text
As transmitted.
994
WUUS51 KPHI 050021
SVRPHI
DEC001-005-MDC011-041-050100-
/O.NEW.KPHI.SV.W.0204.200805T0021Z-200805T0100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
821 PM EDT Tue Aug 4 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northwestern Sussex County in southern Delaware...
Southwestern Kent County in central Delaware...
Northeastern Talbot County in eastern Maryland...
Caroline County in eastern Maryland...
* Until 900 PM EDT.
* At 821 PM EDT, a severe thunderstorm was located over Griffin, or
12 miles northeast of Easton, moving east at 20 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Milford, Denton, Harrington, Bridgeville, Greensboro, Ridgely,
Queen Anne, Tanyard, Harmony, Smithville, Jumptown, Agner,
Matthews, Griffin, Andrewsville, Cordova, Felton, Greenwood,
Frederica and Houston.
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.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3874 7603 3892 7598 3893 7595 3896 7594
3902 7545 3871 7548
TIME...MOT...LOC 0021Z 263DEG 19KT 3887 7587
HAIL...<.75IN
WIND...60MPH
$$
NC2 follow-up statements
264
WWUS51 KPHI 050047
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
847 PM EDT Tue Aug 4 2020
MDC011-041-050056-
/O.CAN.KPHI.SV.W.0204.000000T0000Z-200805T0100Z/
Talbot MD-Caroline MD-
847 PM EDT Tue Aug 4 2020
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN TALBOT AND
CAROLINE COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3873 7571 3893 7573 3899 7573 3902 7545
3871 7548
TIME...MOT...LOC 0046Z 263DEG 19KT 3889 7570
$$
DEC001-005-050100-
/O.CON.KPHI.SV.W.0204.000000T0000Z-200805T0100Z/
Sussex DE-Kent DE-
847 PM EDT Tue Aug 4 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR NORTHWESTERN SUSSEX AND SOUTHWESTERN KENT COUNTIES...
At 846 PM EDT, a severe thunderstorm was located near Andrewsville,
or 20 miles northeast of Hurlock, moving east at 20 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Milford, Harrington, Bridgeville, Andrewsville, Felton, Greenwood,
Frederica, Houston and Farmington.
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.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3873 7571 3893 7573 3899 7573 3902 7545
3871 7548
TIME...MOT...LOC 0046Z 263DEG 19KT 3889 7570
HAIL...<.75IN
WIND...60MPH
$$
NC149
WWUS51 KPHI 050058
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
858 PM EDT Tue Aug 4 2020
DEC001-005-050107-
/O.EXP.KPHI.SV.W.0204.000000T0000Z-200805T0100Z/
Sussex DE-Kent DE-
858 PM EDT Tue Aug 4 2020
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SUSSEX AND
SOUTHWESTERN KENT COUNTIES WILL EXPIRE AT 900 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with this thunderstorm.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 3873 7571 3893 7573 3899 7573 3902 7545
3871 7548
TIME...MOT...LOC 0057Z 263DEG 19KT 3889 7570
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 9:00 PM EDT | Special Weather Statement | PHI | Kent | 30 min |
| Aug 4, 10:25 PM EDT | Special Weather Statement | PHI | New Castle | 50 min |
| Aug 4, 8:03 PM EDT | Special Weather Statement | PHI | Caroline, Talbot | 42 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2020Severe Thunderstorm Warnings in Maryland, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.