Alert archive / Pennsylvania / Areal Flood Advisories in 2018

Areal Flood Advisory 192, NWS Philadelphia/Mount Holly

August 4, 2018Carbon County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood advisory at Aug 4, 2018, 12:24 AM EDT for Carbon County, Pennsylvania. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Aug 4, 2018, 12:24 AM EDT (04:24 UTC)
Expired
Aug 4, 2018, 4:30 AM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

County Carbon County, PA

The radar

The Binghamton radar (KBGM), 144 km from the middle of the area, began a volume at 04:27 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 00:00Z, 4.4 hours before the alert went out and 239 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-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2018-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1302 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2018-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1302 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
561 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
32 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

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 Aug 3, 9:48 PM EDT, 2 hours 36 minutes earlier.

Area forecast discussion, Aug 3, 9:48 PM EDT, 2 hours 36 minutes before
Area Forecast Discussion
National Weather Service Mount Holly NJ
948 PM EDT Fri Aug 3 2018

.SYNOPSIS...
High pressure will remain south and east of the region
overnight and through the weekend. A low pressure trough will
affect the area tonight and early Saturday. Another trough and
weak front will slide towards the area later Monday and remain
across the area until the middle of next week.

&&

.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
The main area of rain was coming together ahead of the mid
level short wave trough this evening. The heavy rain extended
from northern Virginia, across central Maryland to eastern
Pennsylvania around 9:30 PM.

The heavy rain will lift slowly northeastward across our region
during the night. The heaviest rain should be mainly to the
northwest of the Interstate 95 Corridor. A Flash Flood Watch
remains in effect for Berks County, the Lehigh Valley and the
Pocono Region in Pennsylvania, and for northern New Jersey. A
brief period of heavy rain is possible along and to the
southeast of the Interstate 95 Corridor as the tail end of the
precipitation area lifts through that region.

A light south to southwest wind is anticipated overnight. Lows
should range from the upper 60s to the middle 70s.

&&

.SHORT TERM /6 AM SATURDAY MORNING THROUGH 6 PM SATURDAY/...
A cold front works its way through the region during the day
Saturday. Heavy precip begins to taper off late Saturday
morning, but additional showers and possible thunderstorms will
impact eastern zones through the late morning and into the
afternoon. Conditions should begin to clear out over western
zones by midday, and then for eastern zones by late afternoon.

Expect highs generally in the mid to upper 80s except a bit
cooler right along the coast and over the southern Poconos.
Humidity will also remain high with dew points remaining above
70.

&&

.LONG TERM /SATURDAY NIGHT THROUGH FRIDAY/...
Typical summertime weather will remain across the area during
the long term. A high pressure system will continue to pump
humid and very warm air across the area, while occasionally an
upper disturbance or weak surface front will set off showers and
thunderstorms.

The favored time periods for showers and thunderstorms will be
from next Monday night and into the Wed/Thu period as another
upper trough and sfc front meanders across the area. Preceding
this, ample warn and humid air will be in place, so the
possibility for some heavy downpours will be upon us once again.
We have mostly chc pops for the fcst for Tue thru Thu.

Temperatures will be well above normal Sunday and Monday, the
two dry days as an upper ridge will be across the region. Heat
index values during these days will be in the low/mid 90s,so
some limited heat related issues are possible across the urban
areas. After Monday, the added clouds will probably cause
temperatures to fall back closer to normal.

&&

.AVIATION /02Z SATURDAY THROUGH WEDNESDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

Overnight...MVFR and IFR at KRDG and KABE with rain, heavy at
times. VFR lowering to MVFR and IFR in moderate to heavy rain at
KILG, KPHL, KPNE and KTTN. VFR lowering to MVFR in light to
moderate rain at KMIV and KACY. Isolated thunder is expected but
it should not be widespread enough to include in the TAFs.
South to southwest wind 8 knots or less.

Saturday...MVFR in the morning with rain ending. Conditions
improving to VFR for the afternoon hours with clearing taking
place at that time. Southwest wind 6 to 12 knots becoming west.

OUTLOOK...
Saturday night thru Monday...Mostly VFR. Patchy fog psbl
   overnight.

Monday night thru Wednesday...Mostly VFR. Sct tstms with lower
   conditions psbl.

&&

.MARINE...
Conditions will be below SCA criteria overnight and into
Saturday morning. SW winds may gust to 25 kt Saturday afternoon,
but confidence is low in that happening at this time.

OUTLOOK...
Sub-SCA expected. Fair weather Sat night thru Monday night. Sct
showers and tstms Tue thru Wed.

RIP CURRENTS...
There is a moderate risk for the development of dangerous rip
currents on Saturday at the New Jersey and Delaware beaches. The
wind should be from the south and southwest around 10 MPH.
Waves in the surf zone are forecast to be around 3 feet with a
moderate period primary swell. However, there should be an
underlying long period swell (around 14 seconds) from the
southeast and that is the main reason for the moderate risk.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Flash Flood Watch until 8 AM EDT Saturday for PAZ054-055-
     060>062.
NJ...Flash Flood Watch until 8 AM EDT Saturday for NJZ001-007-008.
DE...None.
MD...None.
MARINE...None.

&&

Synopsis...O'Hara
Near Term...Iovino
Short Term...MPS
Long Term...O'Hara
Aviation...Iovino/O'Hara
Marine...MPS/O'Hara
Hazardous weather outlook, Aug 3, 9:58 PM EDT, 2 hours 26 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
958 PM EDT Fri Aug 3 2018

NJZ001-007-008-PAZ054-055-060>062-050200-
Sussex-Warren-Morris-Carbon-Monroe-Berks-Lehigh-Northampton-
958 PM EDT Fri Aug 3 2018

...FLASH FLOOD WATCH IN EFFECT UNTIL 8 AM EDT SATURDAY...

This Hazardous Weather Outlook is for northern New Jersey, east
central Pennsylvania and northeast Pennsylvania.

.DAY ONE...Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flash Flood Watch.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flash Flood Watch.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

DEZ001>003-MDZ008-012-015-019-020-NJZ009-010-012-013-015>023-027-
PAZ070-071-101>106-050200-
New Castle-Kent-Inland Sussex-Cecil-Kent MD-Queen Annes-Talbot-
Caroline-Hunterdon-Somerset-Middlesex-Western Monmouth-Mercer-Salem-
Gloucester-Camden-Northwestern Burlington-Ocean-Cumberland-Atlantic-
Cape May-Southeastern Burlington-Delaware-Philadelphia-
Western Chester-Eastern Chester-Western Montgomery-
Eastern Montgomery-Upper Bucks-Lower Bucks-
958 PM EDT Fri Aug 3 2018

This Hazardous Weather Outlook is for central Delaware, northern
Delaware, southern Delaware, northeast Maryland, central New
Jersey, northern New Jersey, northwest New Jersey, southern New
Jersey and southeast Pennsylvania.

.DAY ONE...Tonight.

Scattered showers and isolated thunderstorms may produce very heavy
downpours leading to urban, small stream and poor drainage flooding
in spots.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Heavy showers and isolated thunderstorms will likely continue into
Saturday morning before moving out of the area by afternoon.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

DEZ004-NJZ014-024>026-050200-
Delaware Beaches-Eastern Monmouth-Atlantic Coastal Cape May-
Coastal Atlantic-Coastal Ocean-
958 PM EDT Fri Aug 3 2018

This Hazardous Weather Outlook is for southern Delaware, central
New Jersey and southern New Jersey.

.DAY ONE...Tonight.

There is a moderate risk for the development of dangerous rip
currents.

Scattered showers and isolated thunderstorms may produce very heavy
downpours leading to urban and poor drainage flooding in spots.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

There is a moderate risk for the development of dangerous rip
currents on Saturday.

Heavy showers and isolated thunderstorms will likely continue into
Saturday morning before moving out of the area by afternoon.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ430-431-450>455-050200-
Delaware Bay waters north of East Point NJ to Slaughter Beach DE-
Delaware Bay waters south of East Point NJ to Slaughter Beach DE-
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm-
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm-
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm-
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm-
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm-
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm-
958 PM EDT Fri Aug 3 2018

This Hazardous Weather Outlook is for Atlantic coastal waters and
Delaware Bay Waters.

.DAY ONE...Tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

In the hours before

Local storm report, Aug 3, 10:37 PM EDT, 1 hour 47 minutes before
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Local storm report, Aug 3, 10:42 PM EDT, 1 hour 42 minutes before
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Local storm report, Aug 3, 10:51 PM EDT, 1 hour 33 minutes before
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Local storm report, Aug 3, 10:57 PM EDT, 1 hour 27 minutes before
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Special weather statement, Aug 3, 11:25 PM EDT, 59 minutes before
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Special weather statement, Aug 4, 12:01 AM EDT, 23 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
1201 AM EDT SAT AUG 4 2018

MDZ008-012-015-019-040430-
Queen Anne's-Talbot-Cecil-Kent-
1201 AM EDT SAT AUG 4 2018

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTH CENTRAL TALBOT...
QUEEN ANNE'S...KENT AND SOUTHWESTERN CECIL COUNTIES...

At 1200 AM EDT, radar indicated strong thunderstorms were located
along a line extending from near Rock Hall to Skipton. Movement was
northeast at 40 mph.

Winds up to 45 mph are possible with these storms.

Locations impacted include...
Centerville, Chestertown, Centreville, Rock Hall, Church Hill,
Betterton, Old Town, Starr, Skipton, Langford, Newtown, Starkey
Corner, Wye Mills, Morgnec, Carville, Kennedyville, Hope, Queenstown
and Kingstown.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 3926 7622 3929 7617 3932 7618 3934 7616
      3933 7614 3937 7611 3937 7606 3939 7604
      3938 7601 3907 7585 3881 7610 3899 7618
      3900 7617 3902 7620 3917 7627
TIME...MOT...LOC 0400Z 207DEG 33KT 3918 7622 3888 7607

CMS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 9:10 PM EDTAreal Flood AdvisoryPHISussex, Warren4 hr
Aug 3, 10:07 PM EDTSpecial Weather StatementPHIWarren53 min
Aug 3, 10:35 PM EDTSpecial Weather StatementPHIMorris, Sussex, Warren55 min
Aug 4, 2:53 AM EDTAreal Flood AdvisoryPHIWarren4 hr
Aug 4, 3:09 AM EDTSpecial Weather StatementPHIWarren51 min
Aug 4, 3:14 AM EDTAreal Flood AdvisoryPHISussex4 hr
Aug 4, 3:55 AM EDTSpecial Weather StatementPHISussex65 min
Aug 4, 3:58 AM EDTAreal Flood WarningPHISussex, Warren33 hr
Aug 4, 5:12 AM EDTAreal Flood AdvisoryPHIMorris3 hr
Aug 4, 5:45 AM EDTAreal Flood AdvisoryPHIHunterdon7 hr
Aug 4, 5:56 AM EDTAreal Flood AdvisoryPHIMorris3 hr
Aug 4, 6:19 AM EDTFlash Flood WarningPHIMorris4 hr
Aug 4, 6:55 AM EDTAreal Flood AdvisoryPHIHunterdon, Mercer, Somerset4 hr
Aug 4, 8:19 AM EDTAreal Flood AdvisoryPHIMiddlesex, Somerset4 hr
Aug 4, 9:32 AM EDTFlash Flood WarningPHISomerset3 hr
Aug 4, 9:39 AM EDTSmall Craft AdvisoryPHI6 hr
Aug 4, 10:16 AM EDTAreal Flood WarningPHIMorris4 hr
Aug 4, 10:51 AM EDTAreal Flood WarningPHIHunterdon, Somerset4 hr
Aug 4, 12:13 PM EDTAreal Flood WarningPHIMiddlesex, Somerset2 hr
Aug 4, 4:41 PM EDTSevere Thunderstorm WarningPHIWarren34 min
Aug 4, 5:04 PM EDTSpecial Weather StatementPHIHunterdon56 min
Aug 3, 8:35 PM EDTAreal Flood AdvisoryPHICarbon4 hr
Aug 3, 9:03 PM EDTFlash Flood WarningPHIBerks8 hr
Aug 3, 10:23 PM EDTFlash Flood WarningPHILehigh, Northampton4 hr
Aug 3, 11:24 PM EDTAreal Flood AdvisoryPHIBerks, Lehigh6 hr
Aug 4, 1:08 AM EDTAreal Flood AdvisoryPHIMonroe4 hr
Aug 4, 1:15 AM EDTSpecial Weather StatementPHIBerks30 min
Aug 4, 1:47 AM EDTSpecial Weather StatementPHIBerks, Lehigh43 min
Aug 4, 1:59 AM EDTAreal Flood AdvisoryPHIChester4 hr
Aug 4, 2:22 AM EDTAreal Flood WarningPHILehigh, Northampton21 hr
Aug 4, 2:27 AM EDTSpecial Weather StatementPHILehigh, Northampton63 min
Aug 4, 4:54 AM EDTAreal Flood WarningPHIBerks7 hr
Aug 4, 5:09 AM EDTAreal Flood AdvisoryPHIMonroe2 hr
Aug 4, 6:45 AM EDTRiver Flood WarningPHIChester4 hr
Aug 4, 8:48 AM EDTAreal Flood WarningPHIChester, Montgomery4 hr
Aug 4, 9:20 AM EDTRiver Flood WarningPHIMontgomery3 hr
Aug 4, 11:55 AM EDTRiver Flood WarningPHIChester, Montgomery, Philadelphia12 hr

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.