Alert archive / Maryland / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 238, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 9, 2021, 4:35 PM EDT for Caroline County, Maryland; Kent County, Delaware. It was in force for 40 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, 4:35 PM EDT (20:35 UTC)
- Expired
- Aug 9, 2021, 5:15 PM EDT
- In force
- 40 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
The radar
The Dover AFB radar (KDOX), 36 km from the middle of the area, began a volume at 20:36 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, 8.6 hours before the alert went out and 127 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.
960
WUUS51 KPHI 092035
SVRPHI
DEC001-MDC011-092115-
/O.NEW.KPHI.SV.W.0238.210809T2035Z-210809T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
435 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...
Northeastern Caroline County in eastern Maryland...
* Until 515 PM EDT.
* At 435 PM EDT, a severe thunderstorm was located over Goldsboro, or
15 miles southwest of Dover, 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...
Goldsboro, Sandtown, Henderson and Marydel.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3899 7582 3905 7584 3915 7570 3898 7565
TIME...MOT...LOC 2035Z 248DEG 5KT 3905 7576
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SFJ1 follow-up statement
012
WWUS51 KPHI 092049
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
449 PM EDT Mon Aug 9 2021
DEC001-MDC011-092115-
/O.CON.KPHI.SV.W.0238.000000T0000Z-210809T2115Z/
Kent DE-Caroline MD-
449 PM EDT Mon Aug 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR WEST CENTRAL KENT AND NORTHEASTERN CAROLINE COUNTIES...
At 449 PM EDT, a severe thunderstorm was located over Sandtown, or 13
miles southwest of Dover, moving east at 5 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Goldsboro, Sandtown, Henderson and Marydel.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3899 7582 3905 7584 3915 7570 3898 7565
TIME...MOT...LOC 2049Z 248DEG 5KT 3906 7574
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
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, 4:59 PM EDT | Flash Flood Warning | PHI | Caroline, Queen Anne's | 79 min |
| Aug 9, 5:12 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's | 20 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.