Alert archive / Maryland / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 102, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 26, 2018, 7:53 PM EDT for Cecil County, Maryland; New Castle County, Delaware; Chester County, Pennsylvania. It was in force for 52 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 26, 2018, 7:53 PM EDT (23:53 UTC)
- Expired
- Sep 26, 2018, 8:45 PM EDT
- In force
- 52 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Cecil County, MD, Chester County, PA
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 26, 5:02 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.9 hours before the alert went out and 147 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
- 6 J/kg
- Mixed-layer CIN
- -201 J/kg
- Mixed-layer LCL
- 948 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 99 m²/s²
- 0-3 km storm-relative helicity
- 111 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
636
WUUS51 KPHI 262353
SVRPHI
DEC003-MDC015-PAC029-270045-
/O.NEW.KPHI.SV.W.0102.180926T2353Z-180927T0045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
753 PM EDT WED SEP 26 2018
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northwestern New Castle County in northern Delaware...
Northern Cecil County in northeastern Maryland...
Southwestern Chester County in southeastern Pennsylvania...
* Until 845 PM EDT.
* At 752 PM EDT, a severe thunderstorm was located over Calvert, or
10 miles northwest of Elkton, moving east at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Newark, Elkton, Havre De Grace, Calvert, Kennett Square, Oxford,
North East, West Grove, Rising Sun, Charlestown, Glen Roy, Zion,
Blake, Barksdale, North Star, Glasgow, Bear, West Nottingham,
Brantwood and Mount Vernon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.
In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3975 7609 3976 7606 3981 7603 3983 7604
3983 7602 3985 7602 3984 7561 3949 7572
3954 7601 3955 7603 3955 7609 3961 7613
TIME...MOT...LOC 2352Z 273DEG 21KT 3970 7598
HAIL...<.75IN
WIND...60MPH
$$
MPS2 follow-up statements
173
WWUS51 KPHI 270020
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
820 PM EDT WED SEP 26 2018
DEC003-MDC015-PAC029-270045-
/O.CON.KPHI.SV.W.0102.000000T0000Z-180927T0045Z/
New Castle DE-Cecil MD-Chester PA-
820 PM EDT WED SEP 26 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM EDT
FOR NORTHWESTERN NEW CASTLE...NORTHEASTERN CECIL AND SOUTH CENTRAL
CHESTER COUNTIES...
At 819 PM EDT, a severe thunderstorm was located over North Star, or
near Newark, moving east at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Newark, Elkton, Kennett Square, West Grove, Barksdale, North Star,
Glasgow, Andora, Cherry Hill, Ladenberg, Pike Creek, Kemblesville,
Fair Hill, Glen Westover, Hockessin, Ashland, Appleton, Bear,
Avondale and Toughkenamon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.
In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3984 7561 3958 7570 3968 7591 3985 7586
TIME...MOT...LOC 0019Z 262DEG 23KT 3975 7574
HAIL...<.75IN
WIND...60MPH
$$
MPS631
WWUS51 KPHI 270036
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
836 PM EDT WED SEP 26 2018
DEC003-MDC015-PAC029-270046-
/O.EXP.KPHI.SV.W.0102.000000T0000Z-180927T0045Z/
New Castle DE-Cecil MD-Chester PA-
836 PM EDT WED SEP 26 2018
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN NEW CASTLE...
NORTHEASTERN CECIL AND SOUTH CENTRAL CHESTER COUNTIES WILL EXPIRE AT
845 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.
A severe thunderstorm watch remains in effect until 1100 PM EDT for
northern Delaware...northeastern Maryland...and southeastern
Pennsylvania.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
in Mount Holly NJ.
LAT...LON 3984 7561 3958 7570 3968 7591 3985 7586
TIME...MOT...LOC 0036Z 273DEG 21KT 3974 7561
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 26, 7:06 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 54 min |
| Sep 26, 7:16 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 43 min |
| Sep 26, 7:31 PM EDT | Areal Flood Advisory | PHI | Cecil | 106 min |
| Sep 25, 9:11 PM EDT | Areal Flood Warning | PHI | Philadelphia | 3 hr |
| Sep 26, 6:15 PM EDT | Special Weather Statement | PHI | Northampton | 30 min |
| Sep 26, 6:37 PM EDT | Special Weather Statement | PHI | Chester | 53 min |
| Sep 26, 6:41 PM EDT | Areal Flood Advisory | PHI | Carbon, Lehigh, Monroe, Northampton | 3 hr |
Nearby
Severe Thunderstorm Warnings in Maryland, 2018Severe Thunderstorm Warnings in Delaware, 2018Severe Thunderstorm Warnings in Pennsylvania, 2018Every severe thunderstorm warning in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.