Alert archive / Maryland / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 12, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 21, 2021, 1:23 PM EDT for Caroline County, Queen Anne's County, Talbot County, Maryland; Kent County, Delaware. It was in force for 37 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Apr 21, 2021, 1:23 PM EDT (17:23 UTC)
- Expired
- Apr 21, 2021, 2:00 PM EDT
- In force
- 37 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, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 36 km from the middle of the area, began a volume at 17:24 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 21, 1:45 PM EDT | HAIL 0.25 | 1 Wsw Dover, DE | SOCIAL MEDIA. |
| Apr 21, 1:50 PM EDT | HAIL 0.7 | 2 Nw Edge Hill, DE | DIME SIZE HAIL IN DOVER, DE. TIME ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 21, 12:28 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 5.4 hours before the alert went out and 131 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
- 12 J/kg
- Mixed-layer CIN
- -142 J/kg
- Mixed-layer LCL
- 1437 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 136 m²/s²
- 0-3 km storm-relative helicity
- 126 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
292
WUUS51 KPHI 211723
SVRPHI
DEC001-MDC011-035-041-211800-
/O.NEW.KPHI.SV.W.0012.210421T1723Z-210421T1800Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
123 PM EDT Wed Apr 21 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Kent County in central Delaware...
Northeastern Talbot County in eastern Maryland...
Eastern Queen Anne's County in northeastern Maryland...
Northern Caroline County in eastern Maryland...
* Until 200 PM EDT.
* At 122 PM EDT, severe thunderstorms were located along a line
extending from near Hartly to Queen Anne, moving east at 55 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters. Quarter size hail was reported
near Sudlersville.
IMPACT...Minor damage to vehicles is possible. Wind damage to
roofs, siding, trees, and power lines is possible.
* Locations impacted include...
Dover, Milford, Denton, Harrington, Camden, Greensboro, Oakland,
Ridgely, Cheswold, Sudlersville, Bowers, Goldsboro, Queen Anne,
Woodside, Viola, Hartly, Rising Sun-Lebanon, Starr, Jumptown and
Hazlettville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3885 7611 3925 7584 3924 7580 3925 7576
3926 7575 3929 7540 3895 7532 3896 7539
3892 7541
TIME...MOT...LOC 1722Z 255DEG 46KT 3916 7578 3891 7598
HAIL...1.00IN
WIND...60MPH
$$
JEO2 follow-up statements
142
WWUS51 KPHI 211737
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
137 PM EDT Wed Apr 21 2021
MDC041-211746-
/O.CAN.KPHI.SV.W.0012.000000T0000Z-210421T1800Z/
Talbot MD-
137 PM EDT Wed Apr 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN TALBOT COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 600 PM EDT for
central Delaware...and eastern and northeastern Maryland.
LAT...LON 3892 7594 3926 7575 3929 7540 3897 7533
3895 7543 3894 7575
TIME...MOT...LOC 1736Z 255DEG 46KT 3920 7558 3895 7578
$$
DEC001-MDC011-035-211800-
/O.CON.KPHI.SV.W.0012.000000T0000Z-210421T1800Z/
Kent DE-Queen Anne's MD-Caroline MD-
137 PM EDT Wed Apr 21 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR KENT...EASTERN QUEEN ANNE'S AND NORTHEASTERN CAROLINE COUNTIES...
At 136 PM EDT, severe thunderstorms were located along a line
extending from Cheswold to near Greensboro, moving east at 55 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated. These storms have previously produced
quarter size hail.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Dover, Camden, Greensboro, Oakland, Ridgely, Cheswold, Bowers,
Goldsboro, Woodside, Viola, Hartly, Rising Sun-Lebanon, Hazlettville,
Dover Base Housing, Dover Speedway, Sandtown, Rising Sun, Wyoming,
Felton and Frederica.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3892 7594 3926 7575 3929 7540 3897 7533
3895 7543 3894 7575
TIME...MOT...LOC 1736Z 255DEG 46KT 3920 7558 3895 7578
HAIL...1.00IN
WIND...60MPH
$$
JEO999
WWUS51 KPHI 211752
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
152 PM EDT Wed Apr 21 2021
DEC001-MDC011-035-211802-
/O.EXP.KPHI.SV.W.0012.000000T0000Z-210421T1800Z/
Kent DE-Queen Anne's MD-Caroline MD-
152 PM EDT Wed Apr 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR KENT...EASTERN QUEEN ANNE'S
AND NORTHEASTERN CAROLINE COUNTIES WILL EXPIRE AT 200 PM EDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 600 PM EDT for
central Delaware...and eastern and northeastern Maryland.
LAT...LON 3892 7594 3926 7575 3929 7540 3897 7533
3895 7543 3894 7575
TIME...MOT...LOC 1752Z 255DEG 46KT 3925 7535 3900 7555
$$
JEOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 12:50 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 40 min |
| Apr 21, 1:10 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 50 min |
| Apr 21, 2:09 PM EDT | Special Weather Statement | PHI | Sussex | 36 min |
| Apr 21, 2:18 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 42 min |
| Apr 21, 2:47 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 16 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.