Alert archive / Maryland / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 239, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 9, 2021, 5:12 PM EDT for Caroline County, Queen Anne's County, Maryland; Kent County, Delaware. It was in force for 20 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 9, 2021, 5:12 PM EDT (21:12 UTC)
- Expired
- Aug 9, 2021, 5:32 PM EDT
- In force
- 20 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Kent County, DE, Caroline County, MD, Queen Anne's County, MD
The radar
The Dover AFB radar (KDOX), 35 km from the middle of the area, began a volume at 21:11 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, 9.2 hours before the alert went out and 128 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
- 927 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 869 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
473
WUUS51 KPHI 092112
SVRPHI
DEC001-MDC011-035-092200-
/O.NEW.KPHI.SV.W.0239.210809T2112Z-210809T2200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
512 PM EDT Mon Aug 9 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
West central Kent County in central Delaware...
East central Queen Anne's County in northeastern Maryland...
Northeastern Caroline County in eastern Maryland...
* Until 600 PM EDT.
* At 512 PM EDT, a severe thunderstorm was located over Goldsboro, or
14 miles east of Centerville, moving northeast at 10 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...
Goldsboro, Woodside, Viola, Hartly, Hazlettville, Sandtown, Felton,
Kenton, Henderson, Marydel, Templeville and Riverview.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3898 7579 3908 7587 3925 7568 3896 7550
TIME...MOT...LOC 2112Z 229DEG 7KT 3907 7579
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SFJ1 follow-up statement
813
WWUS51 KPHI 092132
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
532 PM EDT Mon Aug 9 2021
DEC001-MDC011-035-092141-
/O.CAN.KPHI.SV.W.0239.000000T0000Z-210809T2200Z/
Kent DE-Queen Anne's MD-Caroline MD-
532 PM EDT Mon Aug 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL KENT...EAST
CENTRAL QUEEN ANNE'S AND NORTHEASTERN CAROLINE COUNTIES IS
CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However gusty winds are
still possible with this thunderstorm.
LAT...LON 3898 7579 3908 7587 3925 7568 3896 7550
TIME...MOT...LOC 2129Z 229DEG 7KT 3910 7575
$$
SFJThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 2:41 PM EDT | Areal Flood Advisory | PHI | Caroline, Kent, Queen Anne's | 3 hr |
| Aug 9, 4:35 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 40 min |
| Aug 9, 4:59 PM EDT | Flash Flood Warning | PHI | Caroline, Queen Anne's | 79 min |
| Aug 9, 2:10 PM EDT | Special Weather Statement | PHI | Sussex | 50 min |
| Aug 9, 3:01 PM EDT | Flash Flood Warning | PHI | Kent, Sussex | 2 hr |
| Aug 9, 3:43 PM EDT | Excessive Heat Watch | PHI | New Castle | 12 hr |
| Aug 9, 4:36 PM EDT | Areal Flood Advisory | PHI | New Castle | 104 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.