Alert archive / Delaware / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 70, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 9, 2021, 2:28 PM EDT for Sussex County, Delaware. It was in force for 62 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
- Jun 9, 2021, 2:28 PM EDT (18:28 UTC)
- Expired
- Jun 9, 2021, 3:30 PM EDT
- In force
- 62 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 23 km from the middle of the area, began a volume at 18:28 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, 6.5 hours before the alert went out and 90 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
- 795 J/kg
- Mixed-layer CIN
- -87 J/kg
- Mixed-layer LCL
- 967 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
187
WUUS51 KPHI 091828
SVRPHI
DEC005-091930-
/O.NEW.KPHI.SV.W.0070.210609T1828Z-210609T1930Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
228 PM EDT Wed Jun 9 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northeastern Sussex County in southern Delaware...
* Until 330 PM EDT.
* At 228 PM EDT, a severe thunderstorm was located near Milton, or 9
miles northeast of Georgetown, and is nearly stationary.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Lewes and Milton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition 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 3863 7517 3874 7538 3888 7526 3875 7509
TIME...MOT...LOC 1828Z 214DEG 3KT 3877 7525
HAIL...0.75IN
WIND...60MPH
$$
Gorse2 follow-up statements
180
WWUS51 KPHI 091846
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
246 PM EDT Wed Jun 9 2021
DEC005-091930-
/O.CON.KPHI.SV.W.0070.000000T0000Z-210609T1930Z/
Sussex DE-
246 PM EDT Wed Jun 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR EAST CENTRAL SUSSEX COUNTY...
At 245 PM EDT, a severe thunderstorm was located near Lewes, or 11
miles east of Georgetown, moving east at 5 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Lewes and Milton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning. For your safety, immediately move off the beach and
seek shelter indoors.
&&
LAT...LON 3874 7538 3884 7521 3875 7509 3863 7517
TIME...MOT...LOC 1845Z 287DEG 5KT 3874 7518
HAIL...0.75IN
WIND...60MPH
$$
Gorse214
WWUS51 KPHI 091923
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
323 PM EDT Wed Jun 9 2021
DEC005-091932-
/O.EXP.KPHI.SV.W.0070.000000T0000Z-210609T1930Z/
Sussex DE-
323 PM EDT Wed Jun 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SUSSEX COUNTY
WILL EXPIRE AT 330 PM EDT...
The storm which prompted the warning is moving out of the area.
Therefore, this warning will be allowed to expire. Another warning
continues just to the south.
LAT...LON 3874 7538 3884 7521 3875 7509 3863 7517
TIME...MOT...LOC 1922Z 214DEG 3KT 3877 7516
$$
GorseThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 8:15 PM EDT | Special Weather Statement | PHI | Sussex | 45 min |
| Jun 9, 7:54 AM EDT | River Flood Warning | PHI | New Castle | 5 hr |
| Jun 9, 1:35 PM EDT | Special Weather Statement | PHI | New Castle | 25 min |
| Jun 9, 2:07 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 23 min |
| Jun 9, 2:21 PM EDT | Flash Flood Warning | PHI | New Castle | 73 min |
| Jun 9, 2:26 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 64 min |
| Jun 9, 3:11 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 64 min |
| Jun 9, 3:24 PM EDT | Areal Flood Advisory | PHI | Sussex | 3 hr |
| Jun 9, 4:32 PM EDT | Areal Flood Advisory | PHI | Sussex | 108 min |
| Jun 9, 4:37 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 27 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2021Every severe thunderstorm warning in 2021
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.