Alert archive / Delaware / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 264, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 13, 2021, 7:43 PM EDT for Caroline County, Maryland; Kent County, Sussex County, Delaware. It was in force for 47 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 13, 2021, 7:43 PM EDT (23:43 UTC)
- Expired
- Aug 13, 2021, 8:30 PM EDT
- In force
- 47 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
The radar
The Dover AFB radar (KDOX), 18 km from the middle of the area, began a volume at 23:45 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 13, 8:06 PM EDT | TSTM WND DMG | Greenwood, DE | TREES DOWN IN GREENWOOD, 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 13, 1:11 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 11.7 hours before the alert went out and 113 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
- 809 J/kg
- Mixed-layer CIN
- -190 J/kg
- Mixed-layer LCL
- 1510 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
006
WUUS51 KPHI 132343
SVRPHI
DEC001-005-MDC011-140030-
/O.NEW.KPHI.SV.W.0264.210813T2343Z-210814T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
743 PM EDT Fri Aug 13 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northern Sussex County in southern Delaware...
Southern Kent County in central Delaware...
East central Caroline County in eastern Maryland...
* Until 830 PM EDT.
* At 743 PM EDT, a cluster of severe thunderstorms were located over
Andrewsville, or 17 miles northwest of Georgetown, moving east at
25 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...
Dover, Milford, Denton, Harrington, Camden, Greensboro, Ellendale,
Bowers, Woodside, Viola, Rising Sun-Lebanon, Dover Base Housing,
Sandtown, Andrewsville, Rising Sun, Big Stone Beach, Wyoming,
Felton, Greenwood and Frederica.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3877 7585 3888 7589 3907 7574 3916 7552
3909 7519 3882 7512
TIME...MOT...LOC 2343Z 257DEG 21KT 3888 7561
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
NC2 follow-up statements
634
WWUS51 KPHI 140006
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
806 PM EDT Fri Aug 13 2021
MDC011-140015-
/O.CAN.KPHI.SV.W.0264.000000T0000Z-210814T0030Z/
Caroline MD-
806 PM EDT Fri Aug 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CAROLINE COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3878 7572 3892 7573 3903 7567 3916 7552
3909 7519 3882 7512
TIME...MOT...LOC 0005Z 257DEG 21KT 3891 7544
$$
DEC001-005-140030-
/O.CON.KPHI.SV.W.0264.000000T0000Z-210814T0030Z/
Sussex DE-Kent DE-
806 PM EDT Fri Aug 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR NORTHERN SUSSEX AND SOUTHERN KENT COUNTIES...
At 805 PM EDT, a severe thunderstorm was located over Milford, or 15
miles north of Georgetown, moving east at 25 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...
Dover, Milford, Harrington, Camden, Ellendale, Bowers, Woodside,
Viola, Rising Sun-Lebanon, Dover Base Housing, Andrewsville, Rising
Sun, Big Stone Beach, Wyoming, Felton, Greenwood, Frederica, Houston,
Magnolia and Farmington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3878 7572 3892 7573 3903 7567 3916 7552
3909 7519 3882 7512
TIME...MOT...LOC 0005Z 257DEG 21KT 3891 7544
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
NC346
WWUS51 KPHI 140025
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
825 PM EDT Fri Aug 13 2021
DEC001-005-140035-
/O.EXP.KPHI.SV.W.0264.000000T0000Z-210814T0030Z/
Sussex DE-Kent DE-
825 PM EDT Fri Aug 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN SUSSEX AND SOUTHERN
KENT COUNTIES WILL EXPIRE AT 830 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with this thunderstorm.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 3878 7572 3892 7573 3903 7567 3916 7552
3909 7519 3882 7512
TIME...MOT...LOC 0025Z 257DEG 21KT 3893 7531
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 6:02 PM EDT | Special Weather Statement | PHI | Kent, Queen Anne's | 58 min |
| Aug 13, 6:29 PM EDT | Special Weather Statement | PHI | Caroline | 31 min |
| Aug 13, 6:29 PM EDT | Severe Thunderstorm Warning | PHI | Queen Anne's, Talbot | 25 min |
| Aug 13, 6:45 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's | 30 min |
| Aug 13, 7:12 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's | 33 min |
| Aug 13, 7:57 PM EDT | Areal Flood Advisory | PHI | Caroline, Queen Anne's, Talbot | 93 min |
| Aug 13, 3:21 PM EDT | Special Weather Statement | PHI | Sussex | 24 min |
| Aug 13, 6:04 PM EDT | Special Weather Statement | PHI | Sussex | 26 min |
| Aug 13, 6:47 PM EDT | Special Weather Statement | PHI | Sussex | 43 min |
| Aug 13, 6:53 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 37 min |
| Aug 13, 7:30 PM EDT | Special Weather Statement | PHI | Sussex | 45 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2021Severe 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.