Alert archive / Maryland / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 261, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 13, 2021, 6:45 PM EDT for Caroline County, Queen Anne's County, Maryland; Kent County, Delaware. It was in force for 30 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 13, 2021, 6:45 PM EDT (22:45 UTC)
- Expired
- Aug 13, 2021, 7:15 PM EDT
- In force
- 30 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), 26 km from the middle of the area, began a volume at 22:48 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 |
|---|---|---|---|
| Aug 13, 1:11 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 10.8 hours before the alert went out and 113 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
- 809 J/kg
- Mixed-layer CIN
- -190 J/kg
- Mixed-layer LCL
- 1510 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
754
WUUS51 KPHI 132245
SVRPHI
DEC001-MDC011-035-132315-
/O.NEW.KPHI.SV.W.0261.210813T2245Z-210813T2315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
645 PM EDT Fri Aug 13 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southwestern Kent County in central Delaware...
East central Queen Anne's County in northeastern Maryland...
Northeastern Caroline County in eastern Maryland...
* Until 715 PM EDT.
* At 644 PM EDT, a severe thunderstorm was located near Greensboro,
or 18 miles east of Centerville, moving northeast at 10 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Denton, Harrington, Greensboro, Oakland, Ridgely, Goldsboro,
Woodside, Viola, Jumptown, Griffin, Sandtown, Felton, Henderson,
Marydel, Woodside East and Riverview.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3879 7573 3886 7592 3911 7592 3912 7572
3907 7550 3895 7556 3883 7569 3883 7572
3880 7572
TIME...MOT...LOC 2244Z 221DEG 9KT 3894 7575
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
NC1 follow-up statement
980
WWUS51 KPHI 132300
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
700 PM EDT Fri Aug 13 2021
DEC001-MDC011-035-132315-
/O.CON.KPHI.SV.W.0261.000000T0000Z-210813T2315Z/
Kent DE-Queen Anne's MD-Caroline MD-
700 PM EDT Fri Aug 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR SOUTHWESTERN KENT...EAST CENTRAL QUEEN ANNE'S AND NORTHEASTERN
CAROLINE COUNTIES...
At 700 PM EDT, a severe thunderstorm was near Goldsboro and is
nearly stationary.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Denton, Harrington, Greensboro, Oakland, Ridgely, Goldsboro,
Woodside, Viola, Jumptown, Griffin, Sandtown, Felton, Henderson,
Marydel, Woodside East and Riverview.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3879 7573 3886 7592 3911 7592 3912 7572
3907 7550 3895 7556 3883 7569 3883 7572
3880 7572
TIME...MOT...LOC 2300Z 221DEG 9KT 3867 7548
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 6:02 PM EDT | Special Weather Statement | PHI | Kent, Queen Anne's | 58 min |
| Aug 13, 6:29 PM EDT | Special Weather Statement | PHI | Caroline | 31 min |
| Aug 13, 6:29 PM EDT | Severe Thunderstorm Warning | PHI | Queen Anne's, Talbot | 25 min |
| Aug 13, 7:12 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's | 33 min |
| Aug 13, 7:43 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 47 min |
| Aug 13, 7:57 PM EDT | Areal Flood Advisory | PHI | Caroline, Queen Anne's, Talbot | 93 min |
| Aug 13, 3:21 PM EDT | Special Weather Statement | PHI | Sussex | 24 min |
| Aug 13, 6:04 PM EDT | Special Weather Statement | PHI | Sussex | 26 min |
| Aug 13, 6:47 PM EDT | Special Weather Statement | PHI | Sussex | 43 min |
| Aug 13, 6:53 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 37 min |
| Aug 13, 7:30 PM EDT | Special Weather Statement | PHI | Sussex | 45 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.