Alert archive / Maryland / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 48, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 3, 2018, 7:39 PM EDT for Cecil County, Maryland; Chester County, Pennsylvania. It was in force for 51 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
- Jul 3, 2018, 7:39 PM EDT (23:39 UTC)
- Expired
- Jul 3, 2018, 8:30 PM EDT
- In force
- 51 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Cecil County, MD, Chester County, PA
The radar
The Dover AFB radar (KDOX), 122 km from the middle of the area, began a volume at 23:38 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.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.7 hours before the alert went out and 158 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
- 574 J/kg
- Mixed-layer CIN
- -189 J/kg
- Mixed-layer LCL
- 1257 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 55 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
685
WUUS51 KPHI 032339
SVRPHI
MDC015-PAC029-040030-
/O.NEW.KPHI.SV.W.0048.180703T2339Z-180704T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
739 PM EDT TUE JUL 3 2018
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northeastern Cecil County in northeastern Maryland...
Southwestern Chester County in southeastern Pennsylvania...
* Until 830 PM EDT.
* At 738 PM EDT, severe thunderstorms were located along a line
extending from Cochranville to Oxford, moving south at 15 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...
Calvert, Oxford, Parkesburg, North East, West Grove, Homeville,
Zion, Blake, Cochranville, Lombard, Andora, Pleasant Hill, Mount
Vernon, Cherry Hill, Ladenberg, Kemblesville, Fair Hill, Glen
Westover, Bay View and Appleton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3982 7603 3986 7601 3987 7599 3992 7600
3994 7598 3995 7600 4001 7596 3979 7573
3956 7591 3973 7605
TIME...MOT...LOC 2338Z 342DEG 11KT 3992 7594 3976 7598
HAIL...1.00IN
WIND...60MPH
$$
SFJ2 follow-up statements
340
WWUS51 KPHI 040011
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
811 PM EDT TUE JUL 3 2018
MDC015-PAC029-040030-
/O.CON.KPHI.SV.W.0048.000000T0000Z-180704T0030Z/
Cecil MD-Chester PA-
811 PM EDT TUE JUL 3 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR NORTHEASTERN CECIL AND SOUTHWESTERN CHESTER COUNTIES...
At 811 PM EDT, severe thunderstorms were located along a line
extending from near West Grove to Farmington, moving south at 10 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Calvert, Oxford, Parkesburg, North East, West Grove, Homeville, Zion,
Blake, Cochranville, Lombard, Andora, Pleasant Hill, Mount Vernon,
Cherry Hill, Ladenberg, Kemblesville, Fair Hill, Glen Westover, Bay
View and Appleton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3982 7603 3986 7601 3987 7599 3992 7600
3994 7598 3995 7600 4001 7596 3979 7573
3956 7591 3973 7605
TIME...MOT...LOC 0011Z 349DEG 11KT 3983 7590 3967 7602
HAIL...0.88IN
WIND...60MPH
$$
SFJ060
WWUS51 KPHI 040020
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
820 PM EDT TUE JUL 3 2018
MDC015-PAC029-040030-
/O.EXP.KPHI.SV.W.0048.000000T0000Z-180704T0030Z/
Cecil MD-Chester PA-
820 PM EDT TUE JUL 3 2018
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CECIL AND
SOUTHWESTERN CHESTER COUNTIES WILL EXPIRE AT 830 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 heavy rain
is still possible with these thunderstorms.
LAT...LON 3982 7603 3986 7601 3987 7599 3992 7600
3994 7598 3995 7600 4001 7596 3979 7573
3956 7591 3973 7605
TIME...MOT...LOC 0020Z 342DEG 11KT 3981 7589 3965 7601
$$
SFJThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 3, 7:54 PM EDT | Flash Flood Warning | PHI | Cecil | 4 hr |
| Jul 3, 2:15 PM EDT | Special Weather Statement | PHI | Delaware | 30 min |
| Jul 3, 3:00 PM EDT | Special Weather Statement | PHI | Philadelphia | 60 min |
| Jul 3, 3:11 PM EDT | Flash Flood Warning | PHI | Montgomery, Philadelphia | 50 min |
| Jul 3, 4:06 PM EDT | Special Weather Statement | PHI | Montgomery | 54 min |
| Jul 3, 4:30 PM EDT | Special Weather Statement | PHI | Bucks | 60 min |
| Jul 3, 5:24 PM EDT | Areal Flood Advisory | PHI | Delaware, Montgomery, Philadelphia | 4 hr |
| Jul 3, 5:29 PM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery, Philadelphia | 4 hr |
| Jul 3, 5:30 PM EDT | Special Weather Statement | PHI | Philadelphia | 30 min |
| Jul 3, 5:45 PM EDT | Flash Flood Warning | PHI | Delaware, Montgomery, Philadelphia | 4 hr |
| Jul 3, 6:03 PM EDT | Special Weather Statement | PHI | Monroe | 57 min |
| Jul 3, 6:15 PM EDT | Special Weather Statement | PHI | Chester | 60 min |
| Jul 3, 6:18 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 42 min |
| Jul 3, 6:21 PM EDT | Special Weather Statement | PHI | Delaware | 24 min |
| Jul 3, 6:25 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Philadelphia | 50 min |
| Jul 3, 6:37 PM EDT | Flash Flood Warning | PHI | Bucks, Philadelphia | 3 hr |
| Jul 3, 6:40 PM EDT | Areal Flood Advisory | PHI | Chester, Delaware | 4 hr |
| Jul 3, 6:50 PM EDT | Special Weather Statement | PHI | Delaware | 55 min |
| Jul 3, 6:54 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 51 min |
| Jul 3, 6:58 PM EDT | Flash Flood Warning | PHI | Chester, Delaware | 4 hr |
| Jul 3, 7:03 PM EDT | Special Weather Statement | PHI | Northampton | 57 min |
| Jul 3, 7:06 PM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 2 hr |
| Jul 3, 7:22 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 21 min |
| Jul 3, 7:35 PM EDT | Special Weather Statement | PHI | Chester | 25 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 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; radar from the NEXRAD Level II archive.