Alert archive / Maryland / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 8, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 21, 2021, 12:50 PM EDT for 4 counties in Maryland. It was in force for 40 min. 4 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, 12:50 PM EDT (16:50 UTC)
- Expired
- Apr 21, 2021, 1:30 PM EDT
- In force
- 40 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Caroline County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 69 km from the middle of the area, began a volume at 16:50 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, 1:00 PM EDT | HAIL 0.25 | 2 N Centreville, MD | |
| Apr 21, 1:00 PM EDT | HAIL 0.25 | 2 N Centreville, MD | |
| Apr 21, 1:20 PM EDT | HAIL 1 | 3 Se Church Hill, MD | |
| Apr 21, 1:20 PM EDT | HAIL 1 | 3 Se Church Hill, MD |
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
Washington/Dulle, VA (KIAD), launched 12:00Z, 4.8 hours before the alert went out and 102 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
- 8 J/kg
- Mixed-layer CIN
- -277 J/kg
- Mixed-layer LCL
- 1577 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 128 m²/s²
- 0-3 km storm-relative helicity
- 109 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
048
WUUS51 KPHI 211650
SVRPHI
MDC011-029-035-041-211730-
/O.NEW.KPHI.SV.W.0008.210421T1650Z-210421T1730Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1250 PM EDT Wed Apr 21 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
North central Talbot County in eastern Maryland...
Queen Anne's County in northeastern Maryland...
Northeastern Caroline County in eastern Maryland...
Southwestern Kent County in northeastern Maryland...
* Until 130 PM EDT.
* At 1250 PM EDT, a severe thunderstorm was located over Romancoke,
or 9 miles east of South River, moving northeast at 50 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...
Centerville, Centreville, Romancoke, Oakland, Church Hill,
Sudlersville, Goldsboro, Grasonville, Starr, Stevensville,
Jumptown, Chester, Starkey Corner, Wye Mills, Carville, Hope,
Queenstown, Barclay and Stevensville South.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3902 7632 3898 7628 3897 7622 3900 7617
3904 7621 3920 7584 3901 7574 3885 7621
3893 7620 3896 7623 3896 7625 3892 7625
3894 7628 3893 7631 3896 7631 3891 7634
3886 7633 3884 7637
TIME...MOT...LOC 1650Z 243DEG 44KT 3889 7633
HAIL...1.00IN
WIND...60MPH
$$
JEO1 follow-up statement
276
WWUS51 KPHI 211704
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
104 PM EDT Wed Apr 21 2021
MDC011-029-035-041-211730-
/O.CON.KPHI.SV.W.0008.000000T0000Z-210421T1730Z/
Talbot MD-Queen Anne's MD-Caroline MD-Kent MD-
104 PM EDT Wed Apr 21 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM EDT
FOR NORTH CENTRAL TALBOT...CENTRAL QUEEN ANNE'S...NORTHEASTERN
CAROLINE AND SOUTHWESTERN KENT COUNTIES...
At 104 PM EDT, a severe thunderstorm was located near Wye Mills, or
near Centerville, moving northeast at 50 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Centerville, Centreville, Oakland, Church Hill, Sudlersville,
Goldsboro, Starr, Jumptown, Starkey Corner, Wye Mills, Carville,
Hope, Queenstown and Barclay.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3898 7620 3900 7617 3904 7621 3920 7584
3901 7574 3886 7618 3893 7620
TIME...MOT...LOC 1704Z 243DEG 44KT 3897 7612
HAIL...1.00IN
WIND...60MPH
$$
JEOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 1:23 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 37 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 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.