Alert archive / Maryland / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 297, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 15, 2020, 7:40 PM EST for Kent County, New Castle County, Sussex County, Delaware; 4 counties in Maryland. It was in force for 80 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
- Nov 15, 2020, 7:40 PM EST (00:40 UTC)
- Expired
- Nov 15, 2020, 9:00 PM EST
- In force
- 80 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 41 km from the middle of the area, began a volume at 00:41 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 |
|---|---|---|---|
| Nov 15, 8:24 PM EST | TSTM WND GST 62 | 1 Ne Massey, MD | WEATHER UNDERGROUND SITE KMDMASSE2. |
| Nov 15, 8:55 PM EST | TSTM WND GST 48 | Harrington, DE | DEOS GAUGE AT HARRINGTON. |
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 |
|---|---|---|---|
| Nov 15, 5:35 PM EST | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 00:00Z, 0.7 hours before the alert went out and 115 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 883 m above ground
- 0-6 km bulk shear
- 77 kt
- 0-1 km storm-relative helicity
- 517 m²/s²
- 0-3 km storm-relative helicity
- 602 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
314
WUUS51 KPHI 160040
SVRPHI
DEC001-003-005-MDC011-029-035-041-160200-
/O.NEW.KPHI.SV.W.0297.201116T0040Z-201116T0200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
740 PM EST Sun Nov 15 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Sussex County in southern Delaware...
Southwestern New Castle County in northern Delaware...
Kent County in central Delaware...
Talbot County in eastern Maryland...
Queen Anne's County in northeastern Maryland...
Caroline County in eastern Maryland...
Kent County in northeastern Maryland...
* Until 900 PM EST.
* At 738 PM EST, severe thunderstorms were located along a line
extending from near Salem to near La Plata, moving southeast at 95
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Dover, Middletown, Easton, Georgetown, Centerville, Talbot, Smyrna,
Milford, Seaford, Chestertown, Denton, Centreville, Millsboro,
Laurel, Harrington, Camden, Clayton, Lewes, Federalsburg and
Milton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.
&&
LAT...LON 3846 7569 3869 7577 3870 7590 3857 7604
3877 7632 3867 7634 3896 7631 3884 7637
3884 7638 3895 7636 3904 7631 3900 7617
3915 7628 3932 7618 3938 7577 3952 7578
3956 7566 3877 7486 3857 7484 3845 7502
TIME...MOT...LOC 0038Z 318DEG 82KT 3961 7546 3859 7704
HAIL...<.75IN
WIND...60MPH
$$
NC1 follow-up statement
807
WWUS51 KPHI 160133
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
833 PM EST Sun Nov 15 2020
DEC001-003-005-MDC011-029-035-041-160200-
/O.CON.KPHI.SV.W.0297.000000T0000Z-201116T0200Z/
Sussex DE-New Castle DE-Kent DE-Talbot MD-Queen Anne's MD-
Caroline MD-Kent MD-
833 PM EST Sun Nov 15 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EST
FOR SUSSEX...SOUTHWESTERN NEW CASTLE...KENT...TALBOT...QUEEN
ANNE'S...CAROLINE AND KENT COUNTIES...
At 832 PM EST, severe thunderstorms were located along a line
extending from 29 miles southeast of Diamond Beach to 10 miles south
of Tangier, moving southeast at 65 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Dover, Middletown, Easton, Georgetown, Centerville, Talbot, Smyrna,
Milford, Seaford, Chestertown, Denton, Centreville, Millsboro,
Laurel, Harrington, Camden, Clayton, Lewes, Federalsburg and Milton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.
&&
LAT...LON 3846 7569 3869 7577 3870 7590 3857 7604
3877 7632 3867 7634 3896 7631 3884 7637
3884 7638 3895 7636 3904 7631 3900 7617
3915 7628 3932 7618 3938 7577 3952 7578
3956 7566 3877 7486 3857 7484 3845 7502
TIME...MOT...LOC 0132Z 318DEG 82KT 3869 7442 3768 7600
HAIL...<.75IN
WIND...60MPH
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 15, 7:50 PM EST | Severe Thunderstorm Warning | PHI | New Castle | 70 min |
| Nov 15, 8:57 PM EST | Severe Thunderstorm Warning | PHI | Kent, Sussex | 63 min |
| Nov 15, 11:02 PM EST | Coastal Flood Statement | PHI | Sussex | 3 hr |
Nearby
Severe Thunderstorm Warnings in Maryland, 2020Severe Thunderstorm Warnings in Delaware, 2020Every severe thunderstorm warning in 2020
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.