Alert archive / Delaware / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 207, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 6, 2020, 6:49 AM EDT for Kent County, New Castle County, Delaware. It was in force for 41 min. 5 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 6, 2020, 6:49 AM EDT (10:49 UTC)
- Expired
- Aug 6, 2020, 7:30 AM EDT
- In force
- 41 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 70.0 mph
Counties Kent County, DE, New Castle County, DE
The radar
The Dover AFB radar (KDOX), 31 km from the middle of the area, began a volume at 10:52 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 6, 6:52 AM EDT | TSTM WND DMG | 3 Nnw Felton, DE | DOWNED WIRES REPORTED NEAR FELTON. TIME ESTIMATED FROM RADAR. |
| Aug 6, 6:58 AM EDT | TSTM WND DMG | 2 Wsw Clayton, DE | SEVERAL REPORTS OF TREES AND WIRES DOWN NEAR MILLINGTON ROAD IN WESTERN KENT COUNTY. TIME ESTIMATED FROM RADAR. |
| Aug 6, 6:58 AM EDT | TSTM WND DMG | 3 Sse Smyrna, DE | SEVERAL REPORTS OF TREES AND WIRES DOWN SOUTH OF SMYRNA EASTWARD TO THE LEIPSIC AREA. TIME ESTIMATED FROM RADAR. |
| Aug 6, 7:01 AM EDT | TSTM WND DMG | Clayton, DE | DOWNED TREES AND WIRES NEAR AND SOUTH OF CLAYTON. TIME ESTIMATED FROM RADAR. |
| Aug 6, 7:06 AM EDT | TSTM WND DMG | 2 N Leipsic, DE | SEVERAL REPORTS OF DOWNED POWER LINES IN THE LEIPSIC AREA. TIME ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 00:00Z, 10.8 hours before the alert went out and 130 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
- 1920 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 772 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
699
WUUS51 KPHI 061049
SVRPHI
DEC001-003-061130-
/O.NEW.KPHI.SV.W.0207.200806T1049Z-200806T1130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
649 AM EDT Thu Aug 6 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southwestern New Castle County in northern Delaware...
Kent County in central Delaware...
* Until 730 AM EDT.
* At 648 AM EDT, severe thunderstorms were located along a line
extending from near Green Spring to near Sandtown, moving east at
25 mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Law enforcement.
IMPACT...Minor damage to vehicles is possible. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
* Locations impacted include...
Dover, Smyrna, Milford, Harrington, Camden, Clayton, Cheswold,
Bowers, Woodside, Viola, Hartly, Rising Sun-Lebanon, Woodland
Beach, Hazlettville, Delaney Corner, Dover Base Housing, Dover
Speedway, Sandtown, Green Spring and Rising Sun.
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 these storms. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.
&&
LAT...LON 3940 7577 3944 7549 3898 7523 3895 7532
3896 7539 3892 7541 3890 7549 3890 7572
TIME...MOT...LOC 1048Z 262DEG 21KT 3934 7570 3899 7569
HAIL...1.00IN
WIND...70MPH
$$
CMS2 follow-up statements
015
WWUS51 KPHI 061106
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
706 AM EDT Thu Aug 6 2020
DEC001-003-061130-
/O.CON.KPHI.SV.W.0207.000000T0000Z-200806T1130Z/
New Castle DE-Kent DE-
706 AM EDT Thu Aug 6 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 AM EDT
FOR SOUTHWESTERN NEW CASTLE AND KENT COUNTIES...
At 705 AM EDT, severe thunderstorms were located along a line
extending from near Green Spring to near Viola, moving east at 25
mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Law enforcement. Reports of wires down have been received
near and south of Townsend.
IMPACT...Minor damage to vehicles is possible. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
Locations impacted include...
Dover, Smyrna, Milford, Harrington, Camden, Clayton, Cheswold,
Bowers, Woodside, Viola, Hartly, Rising Sun-Lebanon, Woodland Beach,
Hazlettville, Delaney Corner, Dover Base Housing, Dover Speedway,
Sandtown, Green Spring and Rising Sun.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
Prepare immediately for large hail and damaging winds. People outside
should seek shelter inside a well-built structure and away from
windows.
Frequent cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 3940 7577 3944 7549 3898 7523 3895 7532
3896 7539 3892 7541 3890 7549 3890 7572
TIME...MOT...LOC 1105Z 262DEG 21KT 3935 7558 3900 7557
HAIL...1.00IN
WIND...70MPH
$$
CMS000
WWUS51 KPHI 061125
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
725 AM EDT Thu Aug 6 2020
DEC001-003-061135-
/O.EXP.KPHI.SV.W.0207.000000T0000Z-200806T1130Z/
New Castle DE-Kent DE-
725 AM EDT Thu Aug 6 2020
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN NEW CASTLE AND
KENT COUNTIES WILL EXPIRE AT 730 AM EDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However, gusty
winds and heavy rain are still possible with these thunderstorms.
LAT...LON 3940 7577 3944 7549 3898 7523 3895 7532
3896 7539 3892 7541 3890 7549 3890 7572
TIME...MOT...LOC 1125Z 262DEG 21KT 3936 7545 3901 7544
$$
CMSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 3:37 AM EDT | Flash Flood Watch | PHI | Kent, New Castle, Sussex | 44 hr |
| Aug 6, 6:13 AM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle, Sussex | 62 min |
| Aug 6, 6:43 AM EDT | Areal Flood Advisory | PHI | Kent, New Castle | 3 hr |
| Aug 6, 7:13 AM EDT | Flash Flood Warning | PHI | Kent, New Castle | 3 hr |
| Aug 6, 7:13 AM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 47 min |
| Aug 6, 7:18 AM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 42 min |
| Aug 6, 7:46 AM EDT | Special Weather Statement | PHI | Sussex | 29 min |
| Aug 6, 8:16 AM EDT | Severe Thunderstorm Warning | PHI | Sussex | 44 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.