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Philadelphia/Mount Holly Weather Forecast Office Presentation Created
2/11/2018 4:18 AM @NWS_MountHolly NWSMountHolly
Flooding
potential
today and
this evening
What Has Changed?
No significant changes.
Total rainfall may seem lower on map,
but that does not include rain that
already fell.
Decision Support Briefing #3
As of: 5 am Sunday, February 11,
2018
Philadelphia/Mount Holly Weather Forecast Office Presentation Created
2/11/2018 4:18 AM @NWS_MountHolly NWSMountHolly
Main Points
Hazard Impacts Location Timing
Areal Flooding
Smaller streams may rise and
overflow their banks. Roadways
may quickly become flooded and
impassable.
Greatest risk along NJ
Turnpike/I-95 corridor
from around
Wilmington, DE to New
York City.
The potential for flooding
lasts through this evening.
River Flooding
Some of the larger rivers may
rise to their banks or experience
minor flooding.
Rivers in southeast PA,
including the lower
Schuylkill; rivers in
northern and central NJ,
including the Raritan
and Passaic. If the
Raritan basin sees the
brunt of the rainfall, the
Millstone River could
experience moderate
flooding.
The potential for river
flooding begins this morning
and continues through
tonight.
Philadelphia/Mount Holly Weather Forecast Office Presentation Created
2/11/2018 4:18 AM @NWS_MountHolly NWSMountHolly
River Flooding: N MD/DE, SE PA, most of NJ
Areal Flooding: N MD/DE, SE PA, most of NJ
None Limited Elevated Significant Extreme
Summary of Greatest Impacts
None Limited Elevated Significant Extreme
Philadelphia/Mount Holly Weather Forecast Office Presentation Created
2/11/2018 4:18 AM @NWS_MountHolly NWSMountHolly
Storm Total Rainfall
Forecast details:
Between 1 and 2 inches
of rain has already fallen
across MD, DE, and
southern NJ. An
additional 1 to 2 inches
of rain with locally higher
amounts is expected.
Heaviest rain through
this afternoon.
Flood Watch may have
to be extended based on
how much rain falls and
how rivers respond.
Philadelphia/Mount Holly Weather Forecast Office Presentation Created
2/11/2018 4:18 AM @NWS_MountHolly NWSMountHolly
Flood Watch remains in effect for most of the region.
The heaviest rain will fall through this afternoon.
Low-lying flooding is likely where the heaviest rain occurs.
Minor flooding is possible for most rivers, streams, and creeks today and tonight.
Moderate river flooding cannot be ruled out, especially for the Millstone River.
To see where our concerns specifically lie, visit our AHPS site and click, “River
Forecasts” tab at: https://water.weather.gov/ahps2/index.php?wfo=phi
Event Summary