Alert archive / Maryland / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 192, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 17, 2021, 7:59 PM EDT for Caroline County, Queen Anne's County, Maryland; Kent County, Delaware. It was in force for 46 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, 7:59 PM EDT (23:59 UTC)
- Expired
- Jul 17, 2021, 8:45 PM EDT
- In force
- 46 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Kent County, DE, Caroline County, MD, Queen Anne's County, MD
The radar
The Dover AFB radar (KDOX), 19 km from the middle of the area, began a volume at 00:04 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 12:00Z, 12.0 hours before the alert went out and 115 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
- 2012 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 988 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
275
WUUS51 KPHI 172359
SVRPHI
DEC001-MDC011-035-180045-
/O.NEW.KPHI.SV.W.0192.210717T2359Z-210718T0045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
759 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...
Southeastern Queen Anne's County in northeastern Maryland...
Caroline County in eastern Maryland...
* Until 845 PM EDT.
* At 759 PM EDT, a severe thunderstorm was located over Denton, or 15
miles southeast of Centerville, moving northeast 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...
Dover, Milford, Denton, Harrington, Camden, Greensboro, Oakland,
Ridgely, Bowers, Goldsboro, Queen Anne, Woodside, Viola, Rising
Sun-Lebanon, Jumptown, Hazlettville, Dover Base Housing, Dover
Speedway, Sandtown and Andrewsville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3900 7599 3929 7543 3923 7536 3898 7529
3895 7536 3896 7539 3893 7540 3891 7547
3885 7559 3883 7567 3883 7572 3881 7572
3877 7588
TIME...MOT...LOC 2359Z 235DEG 25KT 3892 7583
HAIL...<.75IN
WIND...60MPH
$$
NC2 follow-up statements
139
WWUS51 KPHI 180022
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
822 PM EDT Sat Jul 17 2021
MDC035-180031-
/O.CAN.KPHI.SV.W.0192.000000T0000Z-210718T0045Z/
Queen Anne's MD-
822 PM EDT Sat Jul 17 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN QUEEN ANNE'S
COUNTY IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
central and southern Delaware...and eastern Maryland.
LAT...LON 3910 7577 3929 7543 3923 7536 3898 7529
3895 7536 3896 7539 3893 7540 3891 7547
3885 7559 3883 7567 3883 7572 3881 7572
3879 7580
TIME...MOT...LOC 0021Z 235DEG 25KT 3901 7566
$$
DEC001-MDC011-180045-
/O.CON.KPHI.SV.W.0192.000000T0000Z-210718T0045Z/
Kent DE-Caroline MD-
822 PM EDT Sat Jul 17 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM EDT
FOR KENT AND NORTHEASTERN CAROLINE COUNTIES...
At 821 PM EDT, a severe thunderstorm was located near Sandtown, or 12
miles southwest of Dover, moving northeast 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...
Dover, Milford, Harrington, Camden, Bowers, Woodside, Viola, Rising
Sun-Lebanon, Hazlettville, Dover Base Housing, Dover Speedway,
Sandtown, Andrewsville, Rising Sun, Big Stone Beach, Wyoming, Felton,
Frederica, Houston and Magnolia.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3910 7577 3929 7543 3923 7536 3898 7529
3895 7536 3896 7539 3893 7540 3891 7547
3885 7559 3883 7567 3883 7572 3881 7572
3879 7580
TIME...MOT...LOC 0021Z 235DEG 25KT 3901 7566
HAIL...<.75IN
WIND...60MPH
$$
NC763
WWUS51 KPHI 180038
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
838 PM EDT Sat Jul 17 2021
DEC001-MDC011-180048-
/O.EXP.KPHI.SV.W.0192.000000T0000Z-210718T0045Z/
Kent DE-Caroline MD-
838 PM EDT Sat Jul 17 2021
...THE SEVERE THUNDERSTORM WARNING FOR KENT AND NORTHEASTERN CAROLINE
COUNTIES WILL EXPIRE AT 845 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
central and southern Delaware...and eastern Maryland.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 3910 7577 3929 7543 3923 7536 3898 7529
3895 7536 3896 7539 3893 7540 3891 7547
3885 7559 3883 7567 3883 7572 3881 7572
3879 7580
TIME...MOT...LOC 0038Z 235DEG 25KT 4017 7470
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 5:09 PM EDT | Special Weather Statement | PHI | Kent | 51 min |
| Jul 17, 5:54 PM EDT | Special Weather Statement | PHI | Kent, Queen Anne's | 36 min |
| Jul 17, 7:36 PM EDT | Special Weather Statement | PHI | Caroline | 39 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 2021Severe 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.