Alert archive / Delaware / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 201, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 17, 2021, 10:55 PM EDT for Kent County, Delaware. It was in force for 50 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
- Jul 17, 2021, 10:55 PM EDT (02:55 UTC)
- Expired
- Jul 17, 2021, 11:45 PM EDT
- In force
- 50 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Kent County, DE
The radar
The Dover AFB radar (KDOX), 24 km from the middle of the area, began a volume at 02:56 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 |
|---|---|---|---|
| Jul 17, 1:13 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 00:00Z, 2.9 hours before the alert went out and 123 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
- 1997 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 1118 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
073
WUUS51 KPHI 180255
SVRPHI
DEC001-180345-
/O.NEW.KPHI.SV.W.0201.210718T0255Z-210718T0345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1055 PM EDT Sat Jul 17 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Kent County in central Delaware...
* Until 1145 PM EDT.
* At 1055 PM EDT, severe thunderstorms were located along a line
extending from near Woodland Beach to Hazlettville to near
Andrewsville, moving northeast at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to
roofs, siding, trees, and power lines is possible.
* Locations impacted include...
Dover, Milford, Harrington, Camden, Cheswold, Bowers, Woodside,
Viola, Rising Sun-Lebanon, Woodland Beach, Hazlettville, Dover Base
Housing, Dover Speedway, Sandtown, Andrewsville, Rising Sun, Big
Stone Beach, Wyoming, Felton and Frederica.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3909 7574 3935 7548 3930 7535 3899 7523
3895 7535 3896 7539 3893 7540 3883 7569
3883 7572
TIME...MOT...LOC 0255Z 235DEG 23KT 3929 7544 3909 7566 3891 7567
HAIL...1.00IN
WIND...60MPH
$$
Staarmann2 follow-up statements
565
WWUS51 KPHI 180313
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1113 PM EDT Sat Jul 17 2021
DEC001-180345-
/O.CON.KPHI.SV.W.0201.000000T0000Z-210718T0345Z/
Kent DE-
1113 PM EDT Sat Jul 17 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT
FOR EASTERN KENT COUNTY...
At 1113 PM EDT, severe thunderstorms were located along a line
extending from 6 miles southeast of Woodland Beach to Bowers to near
Milford, moving east at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Dover, Milford, Camden, Bowers, Woodside, Rising Sun-Lebanon,
Woodland Beach, Rising Sun, Dover Base Housing, Big Stone Beach,
Dover Speedway, Wyoming, Frederica, Houston, Magnolia, Little Creek,
Leipsic, Rodney Village, Kent Acres and Riverview.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3907 7557 3930 7551 3935 7548 3930 7535
3899 7523 3895 7535 3896 7539 3893 7540
3888 7554
TIME...MOT...LOC 0313Z 249DEG 25KT 3926 7539 3906 7542 3893 7546
HAIL...1.00IN
WIND...60MPH
$$
Staarmann282
WWUS51 KPHI 180327
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1127 PM EDT Sat Jul 17 2021
DEC001-180345-
/O.CON.KPHI.SV.W.0201.000000T0000Z-210718T0345Z/
Kent DE-
1127 PM EDT Sat Jul 17 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT
FOR EAST CENTRAL KENT COUNTY...
At 1126 PM EDT, a severe thunderstorm was located over Big Stone
Beach, or 14 miles southeast of Dover, moving east at 20 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Bowers and Big Stone Beach.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3905 7544 3912 7528 3899 7523 3898 7525
3895 7534 3896 7538 3896 7539 3895 7540
TIME...MOT...LOC 0326Z 254DEG 20KT 3901 7533
HAIL...1.00IN
WIND...60MPH
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 8:40 PM EDT | Special Weather Statement | PHI | Kent | 35 min |
| Jul 17, 9:25 PM EDT | Areal Flood Advisory | PHI | New Castle | 2 hr |
| Jul 17, 9:27 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 48 min |
| Jul 17, 9:36 PM EDT | Flash Flood Warning | PHI | New Castle | 2 hr |
| Jul 17, 10:36 PM EDT | Special Weather Statement | PHI | Kent | 24 min |
| Jul 17, 10:54 PM EDT | Areal Flood Advisory | PHI | Kent | 48 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.