Alert archive / Pennsylvania / Areal Flood Advisories in 2018
Areal Flood Advisory 291, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Sep 11, 2018, 6:20 PM EDT for Berks County, Pennsylvania. It was in force for 115 min.
The area
The counties it named.
The facts
- Issued
- Sep 11, 2018, 6:20 PM EDT (22:20 UTC)
- Expired
- Sep 11, 2018, 8:15 PM EDT
- In force
- 115 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
County Berks County, PA
The radar
The Philadelphia radar (KDIX), 139 km from the middle of the area, began a volume at 22:20 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
Wallops Is Stn, VA (KWAL), launched 12:00Z, 10.3 hours before the alert went out and 280 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
- 2340 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 585 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
What forecasters said that day
The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Philadelphia/Mount Holly wrote its last area forecast discussion before this areal flood advisory went out at Sep 11, 6:10 PM EDT, 10 minutes earlier.
Area forecast discussion, Sep 11, 6:10 PM EDT, 10 minutes before
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</html>Hazardous weather outlook, Sep 11, 5:48 PM EDT, 32 minutes before
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</html>In the hours before
Local storm report, Sep 11, 3:15 PM EDT, 3 hours 5 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
315 PM EDT TUE SEP 11 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0300 PM FLOOD 4 WSW BOWERS 39.04N 75.46W
09/11/2018 KENT DE DEPT OF HIGHWAYS
ROUTE 1 AT BOWERS BEACH ROAD CLOSED IN BOTH DIRECTIONS
DUE TO FLOODING.
&&
EVENT NUMBER PHI1801569
STAARMANNSpecial weather statement, Sep 11, 3:15 PM EDT, 3 hours 5 minutes before
Special Weather Statement National Weather Service Mount Holly NJ 315 PM EDT TUE SEP 11 2018 NJZ016>018-021-022-112000- Salem-Cumberland-Camden-Atlantic-Gloucester- 315 PM EDT TUE SEP 11 2018 ...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN ATLANTIC... NORTHEASTERN CUMBERLAND...EAST CENTRAL SALEM...SOUTHEASTERN CAMDEN AND SOUTHEASTERN GLOUCESTER COUNTIES... At 315 PM EDT, a strong thunderstorm was located over Newfield, or near Vineland, moving northeast at 25 mph. Winds up to 40 mph and pea size hail are possible with this storm. Locations impacted include... Vineland, Glassboro, Lindenwold, Hammonton, Clayton, Berlin, Buena, Chesilhurst, Newfield, Elmer, Franklinville, Sicklerville, Williamstown, Olivet, Malaga, Monroe Township, South Vineland, Rosenhayn, Seabrook Farms and Pine Hill. Torrential rainfall is also occurring with this storm, and may cause localized flooding. Do not drive your vehicle through flooded roadways. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. LAT...LON 3942 7500 3952 7523 3982 7498 3966 7470 TIME...MOT...LOC 1915Z 214DEG 22KT 3954 7505 po
Local storm report, Sep 11, 3:32 PM EDT, 2 hours 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
332 PM EDT TUE SEP 11 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0250 PM FLASH FLOOD MILFORD 38.91N 75.43W
09/11/2018 SUSSEX DE LAW ENFORCEMENT
WIDESPREAD ROADWAY FLOODING WITH MANY ROADS IMPASSABLE.
&&
EVENT NUMBER PHI1801570
IOVINOSpecial weather statement, Sep 11, 4:16 PM EDT, 2 hours 4 minutes before
Special Weather Statement National Weather Service Mount Holly NJ 416 PM EDT TUE SEP 11 2018 NJZ017-018-022-027-112100- Camden-Atlantic-Southeastern Burlington-Gloucester- 416 PM EDT TUE SEP 11 2018 ...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT NORTHWESTERN ATLANTIC...SOUTHEASTERN CAMDEN...SOUTHEASTERN GLOUCESTER AND SOUTHEASTERN BURLINGTON COUNTIES... At 415 PM EDT, a cluster of strong thunderstorms was near Mizpah, or 9 miles northeast of Vineland, moving northeast at 15 mph. Winds up to 40 mph are possible with this storm. Locations impacted include... Hammonton, Shamong, Buena, Weymouth, Newfield, Batsto, Wharton State Forest, Elwood-Magnolia, Atsion, Mizpah, Folsom and Collings Lakes. Torrential rainfall is also occurring with this storm, and may cause localized flooding. Do not drive your vehicle through flooded roadways. LAT...LON 3942 7483 3954 7501 3986 7474 3969 7447 TIME...MOT...LOC 2015Z 219DEG 15KT 3954 7486 po
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 4:40 AM EDT | Coastal Flood Advisory | PHI | Atlantic, Burlington, Cape May, Cumberland, Middlesex, Monmouth and 2 more | 10 hr |
| Sep 11, 5:48 AM EDT | Coastal Flood Advisory | PHI | Burlington, Camden, Gloucester, Mercer, Ocean | 14 hr |
| Sep 11, 3:08 PM EDT | Areal Flood Advisory | PHI | Cumberland, Salem | 3 hr |
| Sep 11, 3:15 PM EDT | Special Weather Statement | PHI | Camden | 45 min |
| Sep 11, 4:16 PM EDT | Special Weather Statement | PHI | Atlantic | 44 min |
| Sep 11, 2:25 PM EDT | Flash Flood Warning | PHI | Kent, Sussex | 2 hr |
| Sep 11, 3:40 PM EDT | Areal Flood Advisory | PHI | Kent | 78 min |
Nearby
Areal Flood Advisories in Pennsylvania, 2018Every areal flood advisory 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.