Alert archive / Pennsylvania / Areal Flood Advisories in 2017

Areal Flood Advisory 208, NWS Philadelphia/Mount Holly

August 18, 2017Berks County, Carbon County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood advisory at Aug 18, 2017, 2:10 PM EDT for Berks County, Carbon County, Lehigh County, Pennsylvania. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Aug 18, 2017, 2:10 PM EDT (18:10 UTC)
Expired
Aug 18, 2017, 6:15 PM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Berks County, PA, Carbon County, PA, Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 137 km from the middle of the area, began a volume at 18:10 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, 6.2 hours before the alert went out and 236 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, Washington/Dulle, VA at 12:00Z on 2017-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 746 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, Washington/Dulle, VA at 12:00Z on 2017-08-18The 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
746 J/kg
Mixed-layer CIN
-72 J/kg
Mixed-layer LCL
651 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
76 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 18, 12:14 PM EDT, 1 hour 56 minutes earlier.

Area forecast discussion, Aug 18, 12:14 PM EDT, 1 hour 56 minutes before
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Hazardous weather outlook, Aug 18, 8:05 AM EDT, 6 hours 5 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
805 AM EDT Fri Aug 18 2017

DEZ001-002-MDZ008-012-015-019-020-NJZ001-007>010-012-013-015>019-
PAZ060>062-070-071-101>106-191200-
New Castle-Kent-Cecil-Kent MD-Queen Annes-Talbot-Caroline-Sussex-
Warren-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-Mercer-
Salem-Gloucester-Camden-Northwestern Burlington-Berks-Lehigh-
Northampton-Delaware-Philadelphia-Western Chester-Eastern Chester-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
805 AM EDT Fri Aug 18 2017

...FLASH FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH
THIS EVENING...

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

.DAY ONE...Today and 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.

Some thunderstorms may become severe this afternoon and evening,
producing damaging wind gusts.

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

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed.

DEZ003-NJZ020>023-027-PAZ054-055-191200-
Inland Sussex-Ocean-Cumberland-Atlantic-Cape May-
Southeastern Burlington-Carbon-Monroe-
805 AM EDT Fri Aug 18 2017

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

.DAY ONE...Today and Tonight.

Some thunderstorms may become severe this afternoon and evening,
producing damaging wind gusts. Additionally, heavy rain may result
in localized flooding.

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

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed.

DEZ004-NJZ014-024>026-191200-
Delaware Beaches-Eastern Monmouth-Atlantic Coastal Cape May-
Coastal Atlantic-Coastal Ocean-
805 AM EDT Fri Aug 18 2017

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

.DAY ONE...Today and Tonight.

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

Some thunderstorms may become severe this afternoon and evening,
producing damaging wind gusts. Additionally, heavy rain may result
in localized flooding.

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

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed.

ANZ430-431-450>455-191200-
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-
805 AM EDT Fri Aug 18 2017

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

.DAY ONE...Today and Tonight.

Some thunderstorms may produce locally strong wind gusts this
afternoon and evening.

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

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed.

In the hours before

Special weather statement, Aug 18, 10:51 AM EDT, 3 hours 19 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
1051 AM EDT FRI AUG 18 2017

NJZ020-022-026-027-181545-
Coastal Ocean-Ocean-Atlantic-Southeastern Burlington-
1051 AM EDT FRI AUG 18 2017

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL ATLANTIC...SOUTHEASTERN
OCEAN AND SOUTHEASTERN BURLINGTON COUNTIES...

At 1050 AM EDT, a strong thunderstorm was located over Batsto, or 20
miles northwest of Atlantic City, moving east at 35 mph.

Winds up to 35 mph are possible with this storm.

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

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.

Locations impacted include...
Barnegat, Hammonton, Egg Harbor City, Tuckerton, Port Republic,
Wading River, Brookville, Warren Grove, Bass River State Forest,
Batsto, New Gretna, Penn State Forest, Beach Haven West,
Elwood-Magnolia, Mystic Island, Ocean Acres, Manahawkin and Waretown.

LAT...LON 3980 7409 3986 7413 3981 7417 3977 7410
      3980 7417 3975 7420 3976 7410 3971 7415
      3971 7413 3963 7426 3958 7422 3958 7434
      3950 7429 3956 7441 3950 7440 3949 7468
      3969 7472 3990 7408
TIME...MOT...LOC 1450Z 249DEG 29KT 3964 7459

Gorse
Local storm report, Aug 18, 11:25 AM EDT, 2 hours 45 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1125 AM EDT FRI AUG 18 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0955 AM     FLOOD            TOMS RIVER              39.95N  74.20W
08/18/2017                   OCEAN              NJ   TRAINED SPOTTER

            ROUTE 37 FROM COOLIDGE AVENUE TO FISCHER BOULEVARD
            FLOODED... VIA FIRE DEPARTMENT.

&&

EVENT NUMBER PHI1701469

GORSE
Special weather statement, Aug 18, 11:28 AM EDT, 2 hours 42 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
1128 AM EDT FRI AUG 18 2017

NJZ020-026-027-181615-
Coastal Ocean-Ocean-Southeastern Burlington-
1128 AM EDT FRI AUG 18 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN OCEAN AND
SOUTHEASTERN BURLINGTON COUNTIES...

At 1127 AM EDT, a strong thunderstorm was located over Bass River
State Forest, or 18 miles north of Atlantic City, moving east at 30
mph. Some additional thunderstorms are occurring out ahead of this
stronger storm.

Winds up to 40 mph and pea size hail are possible with this storm.

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.

Locations impacted include...
Barnegat, Tuckerton, Bass River State Forest, New Gretna, Beach Haven
West, Mystic Island, Manahawkin, Ocean Acres and Waretown.

LAT...LON 3980 7410 3981 7417 3977 7412 3978 7414
      3979 7418 3974 7419 3976 7410 3975 7410
      3972 7418 3968 7415 3969 7419 3964 7418
      3967 7422 3962 7420 3963 7426 3958 7422
      3961 7428 3956 7446 3968 7453 3986 7408
TIME...MOT...LOC 1527Z 248DEG 27KT 3963 7440

Gorse

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 3:39 AM EDTFlash Flood WatchPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more18 hr
Aug 18, 3:41 AM EDTSmall Craft AdvisoryPHI18 hr
Aug 18, 10:51 AM EDTSpecial Weather StatementPHIOcean54 min
Aug 18, 11:19 AM EDTAreal Flood AdvisoryPHIBurlington, Ocean116 min
Aug 18, 11:28 AM EDTSpecial Weather StatementPHIOcean47 min
Aug 18, 5:08 PM EDTSpecial Weather StatementPHIHunterdon, Warren37 min
Aug 18, 5:11 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Somerset49 min
Aug 18, 5:20 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester, Mercer, Salem3 hr
Aug 18, 5:39 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester, Salem66 min
Aug 18, 5:42 PM EDTSpecial Weather StatementPHIHunterdon33 min
Aug 18, 5:46 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Somerset44 min
Aug 18, 5:50 PM EDTSpecial Marine WarningPHI55 min
Aug 18, 5:54 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer, Middlesex, Monmouth66 min
Aug 18, 6:13 PM EDTSpecial Weather StatementPHIMiddlesex, Somerset32 min
Aug 18, 6:20 PM EDTAreal Flood AdvisoryPHIMiddlesex, Somerset3 hr
Aug 18, 6:23 PM EDTSpecial Weather StatementPHISomerset37 min
Aug 18, 6:38 PM EDTSpecial Weather StatementPHICamden, Gloucester, Salem37 min
Aug 18, 6:41 PM EDTSpecial Marine WarningPHI64 min
Aug 18, 6:43 PM EDTAreal Flood AdvisoryPHIMonmouth, Ocean3 hr
Aug 18, 6:48 PM EDTSpecial Weather StatementPHICumberland, Gloucester, Salem27 min
Aug 18, 6:53 PM EDTSpecial Weather StatementPHIMiddlesex, Monmouth52 min
Aug 18, 6:54 PM EDTSpecial Weather StatementPHIBurlington, Camden, Gloucester51 min
Aug 18, 6:58 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Ocean29 min
Aug 18, 7:00 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean60 min
Aug 18, 7:19 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Cape May, Cumberland, Ocean, Salem3 hr
Aug 18, 7:25 PM EDTSpecial Weather StatementPHIAtlantic50 min
Aug 18, 7:34 PM EDTSpecial Weather StatementPHICape May26 min
Aug 18, 7:39 PM EDTSpecial Marine WarningPHI66 min
Aug 18, 7:43 PM EDTSpecial Weather StatementPHIBurlington, Ocean47 min
Aug 18, 7:44 PM EDTSpecial Marine WarningPHI61 min
Aug 18, 7:49 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland, Gloucester35 min
Aug 18, 4:48 AM EDTAreal Flood AdvisoryPHIBerks, Lehigh, Northampton4 hr
Aug 18, 2:21 PM EDTSpecial Weather StatementPHIBerks24 min
Aug 18, 2:33 PM EDTSevere Thunderstorm WarningPHIBerks, Lehigh42 min
Aug 18, 3:14 PM EDTSpecial Weather StatementPHIBerks, Lehigh31 min
Aug 18, 3:15 PM EDTAreal Flood AdvisoryPHIBerks4 hr
Aug 18, 3:19 PM EDTSpecial Weather StatementPHINorthampton26 min
Aug 18, 3:37 PM EDTSpecial Weather StatementPHICarbon38 min
Aug 18, 3:43 PM EDTSpecial Weather StatementPHIBerks32 min
Aug 18, 3:45 PM EDTAreal Flood AdvisoryPHICarbon, Lehigh, Monroe, Northampton4 hr
Aug 18, 3:46 PM EDTSevere Thunderstorm WarningPHIBerks, Lehigh, Montgomery, Northampton44 min
Aug 18, 4:02 PM EDTFlash Flood WarningPHIBerks4 hr
Aug 18, 4:24 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Montgomery51 min
Aug 18, 4:29 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Montgomery61 min
Aug 18, 4:57 PM EDTAreal Flood AdvisoryPHIBucks, Chester, Montgomery3 hr
Aug 18, 5:03 PM EDTSevere Thunderstorm WarningPHIChester42 min
Aug 18, 6:10 PM EDTSevere Thunderstorm WarningPHICaroline, Kent, Queen Anne's, Talbot65 min
Aug 18, 6:12 PM EDTAreal Flood AdvisoryPHICecil, Kent, Queen Anne's3 hr
Aug 18, 7:07 PM EDTSevere Thunderstorm WarningPHICaroline, Kent, Queen Anne's, Talbot53 min
Aug 18, 7:33 PM EDTAreal Flood AdvisoryPHICaroline, Talbot3 hr
Aug 18, 7:53 PM EDTSevere Thunderstorm WarningPHICaroline, Kent, Queen Anne's, Talbot48 min

Nearby

Areal Flood Advisories in Pennsylvania, 2017Every areal flood advisory in 2017

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.