Alert archive / Pennsylvania / Flash Flood Warnings in 2018

Flash Flood Warning 34, NWS Philadelphia/Mount Holly

July 16, 2018Monroe County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 16, 2018, 3:44 PM EDT for Monroe County, Pennsylvania. It was in force for 2 hr. 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 16, 2018, 3:44 PM EDT (19:44 UTC)
Expired: Jul 16, 2018, 5:48 PM EDT
In force: 2 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Monroe County, PA

The radar

The Binghamton radar (KBGM), 142 km from the middle of the area, began a volume at 19:44 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

Brookhaven, NY (KOKX), launched 12:00Z, 7.7 hours before the alert went out and 190 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 696 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1024 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

686 
WGUS51 KPHI 161944
FFWPHI
PAC089-162345-
/O.NEW.KPHI.FF.W.0034.180716T1944Z-180716T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
344 PM EDT MON JUL 16 2018

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Northeastern Monroe County in northeastern Pennsylvania...

* Until 745 PM EDT.

* At 344 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between one and two inches of 
  rain is estimated to have already fallen. Flash flooding is 
  expected to begin shortly in the areas of heaviest rain.

* Some locations that could experience flooding include...
  East Stroudsburg, Echo Lake, Werry Lake, Skytop, Mountainhome,
  Canadensis, Alpine Mountain, Marshalls Creek, Hidden Lake, Shawnee
  and Arlington Heights.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.

Please report flooding to your local law enforcement agency when you
can do so safely.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 4115 7515 4114 7509 4108 7503 4109 7497
      4106 7502 4104 7503 4099 7513 4100 7518
      4124 7533 4124 7513

$$

MPS

1 follow-up statement

258 
WGUS71 KPHI 162148
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
548 PM EDT MON JUL 16 2018

PAC089-162158-
/O.CAN.KPHI.FF.W.0034.000000T0000Z-180716T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe PA-
548 PM EDT MON JUL 16 2018

...THE FLASH FLOOD WARNING FOR NORTHEASTERN MONROE COUNTY IS
CANCELLED...

The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.

LAT...LON 4115 7515 4114 7509 4108 7503 4109 7497
      4106 7502 4104 7503 4099 7513 4100 7518
      4124 7533 4124 7513

$$

MPS

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 16, 3:38 PM EDT	Areal Flood Advisory	PHI	Monroe	73 min

Nearby

Flash Flood Warnings in Pennsylvania, 2018 Every flash flood 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.