Alert archive / Delaware / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 237, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 12, 2020, 3:15 PM EDT for Kent County, Sussex County, Delaware. It was in force for 45 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 12, 2020, 3:15 PM EDT (19:15 UTC)
- Expired
- Aug 12, 2020, 4:00 PM EDT
- In force
- 45 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
The radar
The Dover AFB radar (KDOX), 15 km from the middle of the area, began a volume at 19:15 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 12:00Z, 7.3 hours before the alert went out and 97 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
- 1590 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 729 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
290
WUUS51 KPHI 121915
SVRPHI
DEC001-005-122000-
/O.NEW.KPHI.SV.W.0237.200812T1915Z-200812T2000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
315 PM EDT Wed Aug 12 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northwestern Sussex County in southern Delaware...
Southern Kent County in central Delaware...
* Until 400 PM EDT.
* At 315 PM EDT, a severe thunderstorm was located over Andrewsville,
or 15 miles northwest of Georgetown, moving north at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Milford, Seaford, Harrington, Bridgeville, Ellendale, Andrewsville,
Blades, Greenwood, 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.
In addition to 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 3864 7571 3885 7573 3900 7573 3899 7528
3863 7548
TIME...MOT...LOC 1915Z 193DEG 26KT 3885 7559
HAIL...<.75IN
WIND...60MPH
$$
Gorse1 follow-up statement
491
WWUS51 KPHI 121931 RRA
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
331 PM EDT Wed Aug 12 2020
DEC001-005-122000-
/O.CON.KPHI.SV.W.0237.000000T0000Z-200812T2000Z/
Sussex DE-Kent DE-
331 PM EDT Wed Aug 12 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR NORTHWESTERN SUSSEX AND SOUTHERN KENT COUNTIES...
At 331 PM EDT, a severe thunderstorm was located over Harrington, or
15 miles south of Dover, moving north at 20 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Milford, Harrington, Bridgeville, Ellendale, Andrewsville, Greenwood,
Houston and Farmington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
&&
LAT...LON 3886 7573 3900 7573 3899 7528 3878 7540
3872 7571
TIME...MOT...LOC 1931Z 200DEG 16KT 3894 7555
HAIL...<.75IN
WIND...60MPH
$$
GorseThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 12:43 PM EDT | Areal Flood Advisory | PHI | New Castle | 3 hr |
| Aug 12, 12:55 PM EDT | Areal Flood Advisory | PHI | Kent, New Castle | 3 hr |
| Aug 12, 12:55 PM EDT | Special Weather Statement | PHI | Kent | 35 min |
| Aug 12, 1:06 PM EDT | Flash Flood Warning | PHI | Kent, New Castle | 3 hr |
| Aug 12, 1:37 PM EDT | Areal Flood Advisory | PHI | New Castle | 3 hr |
| Aug 12, 1:54 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 51 min |
| Aug 12, 2:38 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 52 min |
| Aug 12, 2:40 PM EDT | Flash Flood Warning | PHI | New Castle | 3 hr |
| Aug 12, 3:06 PM EDT | Areal Flood Advisory | PHI | Kent, Sussex | 3 hr |
| Aug 12, 3:20 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 29 min |
| Aug 12, 3:31 PM EDT | Flash Flood Warning | PHI | Kent | 3 hr |
| Aug 12, 3:46 PM EDT | Flash Flood Warning | PHI | Kent, Sussex | 3 hr |
| Aug 12, 4:00 PM EDT | Special Weather Statement | PHI | Kent | 30 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.