Alert archive / New Jersey / Flash Flood Watches in 2017

Flash Flood Watch 7, NWS Philadelphia/Mount Holly

August 18, 20174 states

NWS Philadelphia/Mount Holly issued this flash flood watch at Aug 18, 2017, 3:39 AM EDT for 4 states. It took effect at Aug 18, 2017, 2:00 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Aug 18, 2017, 3:39 AM EDT (07:39 UTC)
In effect from
Aug 18, 2017, 2:00 PM EDT
Expired
Aug 18, 2017, 9:32 PM EDT
In force
8 hr
Issued by
NWS Philadelphia/Mount Holly
Flood severity
None
All 32 counties

Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 67 km from the middle of the area, began a volume at 07:42 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 00:00Z, 7.7 hours before the alert went out and 217 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 00:00Z on 2017-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1071 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2017-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 square meters per square second.1939Sfc1 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
1071 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
981 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
146 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.1

Open this sounding in Storm Lab

The text

As transmitted.

669 
WGUS61 KPHI 180739
FFAPHI

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Mount Holly NJ
339 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>106-181545-
/O.NEW.KPHI.FF.A.0007.170818T1800Z-170819T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
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-
Including the cities of Wilmington, Dover, Elkton, Chestertown, 
Centreville, Easton, Denton, Newton, Washington, Morristown, 
Flemington, Somerville, New Brunswick, Freehold, Trenton, 
Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, 
Mount Holly, Reading, Allentown, Bethlehem, Media, Philadelphia, 
Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, 
Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville,
and Doylestown
339 AM EDT Fri Aug 18 2017

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

The National Weather Service in Mount Holly has issued a

* Flash Flood Watch for portions of southwestern, central and
  northwestern New Jersey, eastern Pennsylvania, central and
  southern Delaware and northeastern Maryland. 

* From 2 PM EDT this afternoon through this evening

* Multiple rounds of showers and thunderstorms can be expected
  through tonight. While flash flooding is not anticipated with
  the initial round this morning, locally higher rainfall amounts
  of 1 to 2 inches are possible, and will help saturate the ground
  for the next round of storms. Torrential downpours with storms
  that develop this afternoon and evening could produce rainfall
  rates greater than 2 inches per hour. While the entire area will
  not receive heavy rain, isolated rainfall totals of 3 to 6
  inches are possible where storms track over the same locations.
 
* Torrential rain falling in a short period of time will result in
  rapidly rising water levels along streams and creeks and in
  areas of poor drainage. Significant roadway flooding is possible
  in isolated areas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

Basement flooding is possible due to heavy rain falling on soils 
already saturated from previous storms. If your home has a history
of basement flooding, monitor your sump pump for proper operation
and if possible, direct outside water flow away from your house


&&

$$
Klein
4 follow-up statements
692 
WGUS61 KPHI 181619
FFAPHI

Flood Watch
National Weather Service Mount Holly NJ
1219 PM EDT Fri Aug 18 2017

DEZ001-002-MDZ008-012-015-019-020-NJZ001-007>010-012-013-015>019-
PAZ060>062-070-071-101>106-190130-
/O.CON.KPHI.FF.A.0007.170818T1800Z-170819T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
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-
Including the cities of Wilmington, Dover, Elkton, Chestertown, 
Centreville, Easton, Denton, Newton, Washington, Morristown, 
Flemington, Somerville, New Brunswick, Freehold, Trenton, 
Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, 
Mount Holly, Reading, Allentown, Bethlehem, Media, Philadelphia, 
Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, 
Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville,
and Doylestown
1219 PM EDT Fri Aug 18 2017

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT
TONIGHT...

The Flash Flood Watch continues for

* Portions of Delaware, northeast Maryland, New Jersey, and 
  Pennsylvania, including the following areas, in Delaware, Kent 
  and New Castle. In northeast Maryland, Caroline, Cecil, Kent 
  MD, Queen Annes, and Talbot. In New Jersey, Camden, 
  Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern 
  Burlington, Salem, Somerset, Sussex, Warren, and Western 
  Monmouth. In Pennsylvania, Berks, Delaware, Eastern Chester, 
  Eastern Montgomery, Lehigh, Lower Bucks, Northampton, 
  Philadelphia, Upper Bucks, Western Chester, and Western 
  Montgomery. 

* Until midnight EDT tonight

* Multiple rounds of showers and thunderstorms can be expected
  through tonight. Torrential downpours with storms that develop 
  this afternoon and evening could produce rainfall rates greater 
  than 2 inches per hour. While the entire area will not receive 
  heavy rain, isolated rainfall totals of 3 to 6 inches are 
  possible where storms track over the same locations. 

* Torrential rain falling in a short period of time will result 
  in rapidly rising water levels along streams and creeks and in 
  areas of poor drainage. Significant roadway flooding is 
  possible in isolated areas. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$
595 
WGUS61 KPHI 181919
FFAPHI

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Mount Holly NJ
319 PM EDT Fri Aug 18 2017

DEZ003-004-NJZ014-020>027-190400-
/O.EXA.KPHI.FF.A.0007.000000T0000Z-170819T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Inland Sussex-Delaware Beaches-Eastern Monmouth-Ocean-Cumberland-
Atlantic-Cape May-Atlantic Coastal Cape May-Coastal Atlantic-
Coastal Ocean-Southeastern Burlington-
Including the cities of Georgetown, Rehoboth Beach, Sandy Hook, 
Jackson, Millville, Hammonton, Cape May Court House, Ocean City, 
Atlantic City, Long Beach Island, and Wharton State Forest
319 PM EDT Fri Aug 18 2017

...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...

The National Weather Service in Mount Holly has expanded the

* Flash Flood Watch to include portions of southern Delaware and 
  New Jersey, including the following areas, in southern 
  Delaware, Delaware Beaches and Inland Sussex. In New Jersey, 
  Atlantic, Atlantic Coastal Cape May, Cape May, Coastal 
  Atlantic, Coastal Ocean, Cumberland, Eastern Monmouth, Ocean, 
  and Southeastern Burlington. 

* Until midnight EDT tonight

* Multiple rounds of showers and thunderstorms can be expected
  through tonight. Torrential downpours with storms that develop
  this evening could produce rainfall rates greater than 2 inches
  per hour. While the entire area will not receive heavy rain, 
  isolated rainfall totals of 3 to 6 inches are possible where 
  storms track over the same locations. 

* Torrential rain falling in a short period of time will result 
  in rapidly rising water levels along streams and creeks and in 
  areas of poor drainage. Significant roadway flooding is 
  possible in isolated areas. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

DEZ001-002-MDZ008-012-015-019-020-NJZ001-007>010-012-013-015>019-
PAZ060>062-070-071-101>106-190400-
/O.CON.KPHI.FF.A.0007.000000T0000Z-170819T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
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-
Including the cities of Wilmington, Dover, Elkton, Chestertown, 
Centreville, Easton, Denton, Newton, Washington, Morristown, 
Flemington, Somerville, New Brunswick, Freehold, Trenton, 
Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, 
Mount Holly, Reading, Allentown, Bethlehem, Media, Philadelphia, 
Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, 
Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville,
and Doylestown
319 PM EDT Fri Aug 18 2017

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT
TONIGHT...

The Flash Flood Watch continues for

* Portions of Delaware, northeast Maryland, New Jersey, and 
  Pennsylvania, including the following areas, in Delaware, Kent 
  and New Castle. In northeast Maryland, Caroline, Cecil, Kent 
  MD, Queen Annes, and Talbot. In New Jersey, Camden, 
  Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern 
  Burlington, Salem, Somerset, Sussex, Warren, and Western 
  Monmouth. In Pennsylvania, Berks, Delaware, Eastern Chester, 
  Eastern Montgomery, Lehigh, Lower Bucks, Northampton, 
  Philadelphia, Upper Bucks, Western Chester, and Western 
  Montgomery. 

* Until midnight EDT tonight

* Multiple rounds of showers and thunderstorms can be expected
  through tonight. Torrential downpours with storms that develop
  this evening could produce rainfall rates greater than 2 inches
  per hour. While the entire area will not receive heavy rain, 
  isolated rainfall totals of 3 to 6 inches are possible where 
  storms track over the same locations. 

* Torrential rain falling in a short period of time will result 
  in rapidly rising water levels along streams and creeks and in 
  areas of poor drainage. Significant roadway flooding is 
  possible in isolated areas. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

MPS
486 
WGUS61 KPHI 182336
FFAPHI

Flood Watch
National Weather Service Mount Holly NJ
736 PM EDT Fri Aug 18 2017

NJZ001-007>010-012-015-PAZ060>062-070-071-101>106-190045-
/O.CAN.KPHI.FF.A.0007.000000T0000Z-170819T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer-Berks-
Lehigh-Northampton-Delaware-Philadelphia-Western Chester-
Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-
Lower Bucks-
Including the cities of Newton, Washington, Morristown, 
Flemington, Somerville, New Brunswick, Trenton, Reading, 
Allentown, Bethlehem, Easton, Media, Philadelphia, Honey Brook, 
Oxford, West Chester, Kennett Square, Collegeville, Pottstown, 
Norristown, Lansdale, Chalfont, Perkasie, Morrisville, 
and Doylestown
736 PM EDT Fri Aug 18 2017

...FLASH FLOOD WATCH IS CANCELLED...

The Flash Flood Watch for portions of New Jersey and Pennsylvania
has been cancelled as the threat for heavy rain and flooding has 
ended.

$$

DEZ001>004-MDZ008-012-015-019-020-NJZ013-014-016>027-190400-
/O.CON.KPHI.FF.A.0007.000000T0000Z-170819T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle-Kent-Inland Sussex-Delaware Beaches-Cecil-Kent MD-
Queen Annes-Talbot-Caroline-Western Monmouth-Eastern Monmouth-
Salem-Gloucester-Camden-Northwestern Burlington-Ocean-Cumberland-
Atlantic-Cape May-Atlantic Coastal Cape May-Coastal Atlantic-
Coastal Ocean-Southeastern Burlington-
Including the cities of Wilmington, Dover, Georgetown, 
Rehoboth Beach, Elkton, Chestertown, Centreville, Easton, Denton,
Freehold, Sandy Hook, Pennsville, Glassboro, Camden, Cherry Hill,
Moorestown, Mount Holly, Jackson, Millville, Hammonton, 
Cape May Court House, Ocean City, Atlantic City, 
Long Beach Island, and Wharton State Forest
736 PM EDT Fri Aug 18 2017

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT
TONIGHT...

The Flash Flood Watch continues for

* Portions of Delaware, northeast Maryland, and New Jersey, 
  including the following areas, in Delaware, Delaware Beaches, 
  Inland Sussex, Kent, and New Castle. In northeast Maryland, 
  Caroline, Cecil, Kent MD, Queen Annes, and Talbot. In New 
  Jersey, Atlantic, Atlantic Coastal Cape May, Camden, Cape May, 
  Coastal Atlantic, Coastal Ocean, Cumberland, Eastern Monmouth, 
  Gloucester, Northwestern Burlington, Ocean, Salem, 
  Southeastern Burlington, and Western Monmouth. 

* Until midnight EDT tonight.

* Showers and thunderstorms will continue to move east across the
  area this evening, producing areas of torrential rainfall with
  rainfall rates greater than 2 inches per hour. 

* Torrential rain falling in a short period of time can result in
  flash flooding of roads and result in rapidly rising water
  levels along streams and creeks.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$
307 
WGUS61 KPHI 190132
FFAPHI

Flood Watch
National Weather Service Mount Holly NJ
932 PM EDT Fri Aug 18 2017

DEZ001>004-MDZ008-012-015-019-020-NJZ013-014-016>027-190245-
/O.CAN.KPHI.FF.A.0007.000000T0000Z-170819T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle-Kent-Inland Sussex-Delaware Beaches-Cecil-Kent MD-
Queen Annes-Talbot-Caroline-Western Monmouth-Eastern Monmouth-
Salem-Gloucester-Camden-Northwestern Burlington-Ocean-Cumberland-
Atlantic-Cape May-Atlantic Coastal Cape May-Coastal Atlantic-
Coastal Ocean-Southeastern Burlington-
Including the cities of Wilmington, Dover, Georgetown, 
Rehoboth Beach, Elkton, Chestertown, Centreville, Easton, Denton,
Freehold, Sandy Hook, Pennsville, Glassboro, Camden, Cherry Hill,
Moorestown, Mount Holly, Jackson, Millville, Hammonton, 
Cape May Court House, Ocean City, Atlantic City, 
Long Beach Island, and Wharton State Forest
932 PM EDT Fri Aug 18 2017

...FLASH FLOOD WATCH IS CANCELLED...

The potential for flash flooding has diminished. As a result, the
Flash Flood Watch has been cancelled.

$$

Iovino

The office that day

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

IssuedProductOfficeCountiesLasted
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, 2:10 PM EDTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh4 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 WarningPHIKent65 min
Aug 18, 6:12 PM EDTAreal Flood AdvisoryPHIKent, New Castle3 hr
Aug 18, 6:20 PM EDTSpecial Weather StatementPHISussex25 min
Aug 18, 7:07 PM EDTSevere Thunderstorm WarningPHIKent, New Castle, Sussex53 min
Aug 18, 7:33 PM EDTAreal Flood AdvisoryPHIKent, Sussex3 hr
Aug 18, 7:53 PM EDTSevere Thunderstorm WarningPHIKent, Sussex48 min

Nearby

Flash Flood Watches in New Jersey, 2017Flash Flood Watches in Pennsylvania, 2017Flash Flood Watches in Maryland, 2017Every flash flood watch 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.