Alert archive / Maryland / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 261, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 25, 2020, 9:12 PM EDT for Caroline County, Talbot County, Maryland; Kent County, Sussex County, Delaware. It was in force for 48 min. 1 report 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
- Aug 25, 2020, 9:12 PM EDT (01:12 UTC)
- Expired
- Aug 25, 2020, 10:00 PM EDT
- In force
- 48 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Kent County, DE, Sussex County, DE, Caroline County, MD, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 35 km from the middle of the area, began a volume at 01:12 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 |
|---|---|---|---|
| Aug 25, 9:14 PM EDT | TSTM WND DMG | Denton, MD | REPORT OF A TREE BLOWN DOWN IN DENTON. 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 |
|---|---|---|---|
| Aug 25, 3:34 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 00:00Z, 1.2 hours before the alert went out and 87 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
- 1713 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 1304 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 215 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 8.1
The text
As transmitted.
710
WUUS51 KPHI 260112
SVRPHI
DEC001-005-MDC011-041-260200-
/O.NEW.KPHI.SV.W.0261.200826T0112Z-200826T0200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
912 PM EDT Tue Aug 25 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Western Sussex County in southern Delaware...
Southwestern Kent County in central Delaware...
Southeastern Talbot County in eastern Maryland...
Southeastern Caroline County in eastern Maryland...
* Until 1000 PM EDT.
* At 912 PM EDT, severe thunderstorms were located along a line
extending from near Greensboro to Secretary, moving east at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Georgetown, Milford, Seaford, Denton, Laurel, Harrington,
Federalsburg, Milton, Bridgeville, Ridgely, Delmar, Preston,
Ellendale, Harmony, Smithville, Agner, Choptank, Sycamore,
Andrewsville and Blades.
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 3846 7569 3864 7571 3869 7577 3868 7580
3870 7580 3871 7584 3868 7594 3859 7600
3857 7602 3858 7604 3878 7590 3896 7588
3890 7528 3845 7541
TIME...MOT...LOC 0112Z 283DEG 28KT 3894 7581 3863 7593
HAIL...<.75IN
WIND...60MPH
$$
JEO3 follow-up statements
493
WWUS51 KPHI 260124
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
924 PM EDT Tue Aug 25 2020
MDC041-260134-
/O.CAN.KPHI.SV.W.0261.000000T0000Z-200826T0200Z/
Talbot MD-
924 PM EDT Tue Aug 25 2020
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN TALBOT COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
central and southern Delaware...and eastern Maryland.
LAT...LON 3846 7569 3864 7571 3869 7577 3868 7580
3870 7580 3871 7584 3895 7577 3890 7528
3845 7541
TIME...MOT...LOC 0124Z 283DEG 28KT 3892 7571 3861 7583
$$
DEC001-005-MDC011-260200-
/O.CON.KPHI.SV.W.0261.000000T0000Z-200826T0200Z/
Sussex DE-Kent DE-Caroline MD-
924 PM EDT Tue Aug 25 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM EDT
FOR WESTERN SUSSEX...SOUTHWESTERN KENT AND SOUTHEASTERN CAROLINE
COUNTIES...
At 924 PM EDT, severe thunderstorms were located along a line
extending from near Andrewsville to near Hurlock, moving east at 30
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Georgetown, Milford, Seaford, Laurel, Harrington, Federalsburg,
Milton, Bridgeville, Delmar, Ellendale, Smithville, Agner, Sycamore,
Andrewsville, Blades, Greenwood, Houston, Bethel and Farmington.
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 3846 7569 3864 7571 3869 7577 3868 7580
3870 7580 3871 7584 3895 7577 3890 7528
3845 7541
TIME...MOT...LOC 0124Z 283DEG 28KT 3892 7571 3861 7583
HAIL...<.75IN
WIND...60MPH
$$
JEO896
WWUS51 KPHI 260143
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
943 PM EDT Tue Aug 25 2020
DEC001-MDC011-260153-
/O.CAN.KPHI.SV.W.0261.000000T0000Z-200826T0200Z/
Kent DE-Caroline MD-
943 PM EDT Tue Aug 25 2020
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN KENT AND
SOUTHEASTERN CAROLINE COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
central and southern Delaware.
LAT...LON 3850 7569 3881 7571 3883 7559 3884 7558
3884 7555 3888 7551 3890 7528 3845 7541
3845 7542
TIME...MOT...LOC 0143Z 283DEG 28KT 3889 7554 3858 7567
$$
DEC005-260200-
/O.CON.KPHI.SV.W.0261.000000T0000Z-200826T0200Z/
Sussex DE-
943 PM EDT Tue Aug 25 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM EDT
FOR WESTERN SUSSEX COUNTY...
At 943 PM EDT, severe thunderstorms were located along a line
extending from near Harrington to near Sharptown, moving east at 30
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Georgetown, Seaford, Laurel, Milton, Bridgeville, Ellendale,
Sycamore, Blades, Greenwood and Bethel.
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 3850 7569 3881 7571 3883 7559 3884 7558
3884 7555 3888 7551 3890 7528 3845 7541
3845 7542
TIME...MOT...LOC 0143Z 283DEG 28KT 3889 7554 3858 7567
HAIL...<.75IN
WIND...60MPH
$$
JEO295
WWUS51 KPHI 260151
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
951 PM EDT Tue Aug 25 2020
DEC005-260201-
/O.EXP.KPHI.SV.W.0261.000000T0000Z-200826T0200Z/
Sussex DE-
951 PM EDT Tue Aug 25 2020
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN SUSSEX COUNTY WILL
EXPIRE AT 1000 PM EDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
central and southern Delaware.
LAT...LON 3850 7569 3881 7571 3883 7559 3884 7558
3884 7555 3888 7551 3890 7528 3845 7541
3845 7542
TIME...MOT...LOC 0151Z 283DEG 28KT 3888 7548 3857 7561
$$
JEOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 8:23 PM EDT | Special Weather Statement | PHI | Caroline | 37 min |
| Aug 25, 8:28 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 47 min |
| Aug 25, 9:00 PM EDT | Special Weather Statement | PHI | Caroline | 45 min |
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.