Alert archive / Pennsylvania / Flood Watches in 2020
Flood Watch 4, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flood watch at Dec 22, 2020, 3:22 PM EST for 7 counties in New Jersey; 10 counties in Pennsylvania; New Castle County, Delaware. It took effect at Dec 24, 2020, 4:00 PM EST. It was in force for 18 hr.
The area
The counties it named.
The facts
- Issued
- Dec 22, 2020, 3:22 PM EST (20:22 UTC)
- In effect from
- Dec 24, 2020, 4:00 PM EST
- Expired
- Dec 25, 2020, 9:36 AM EST
- In force
- 18 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
Counties New Castle County, DE, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 87 km from the middle of the area, began a volume at 20:24 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, 8.4 hours before the alert went out and 200 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 790 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 10 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
406 WGUS61 KPHI 222022 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 322 PM EST Tue Dec 22 2020 .Heavy rain may fall on a deep primed snowpack leading to the melt increasing. Flows in rivers may increase quickly and reach critical levels. NJZ001-007-PAZ054-055-060>062-231100- /O.NEW.KPHI.FA.A.0004.201224T2300Z-201225T1100Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sussex-Warren-Carbon-Monroe-Berks-Lehigh-Northampton- Including the cities of Jim Thorpe, Allentown, Newton, Washington, Bethlehem, Stroudsburg, Reading, and Easton 322 PM EST Tue Dec 22 2020 ...FLOOD WATCH IN EFFECT FROM THURSDAY EVENING THROUGH LATE THURSDAY NIGHT... The National Weather Service in Mount Holly has issued a * Flood Watch for portions of northern New Jersey...and Pennsylvania...including the following areas...in northern New Jersey...Sussex and Warren. In Pennsylvania...Berks, Carbon, Lehigh, Monroe, and Northampton. * From Thursday evening through late Thursday night * Heavy rain will move into the region Thursday night, with between 1 and 2 inches of rain over the region and as much as 2 to 3 inches of rain over the southern Poconos. * The heaviest rain will fall over snowpack with as much as an inch of liquid equivalent rainfall, leading to rapid melting of the snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay away or be swept away. River banks and culverts can become unstable and unsafe. A Flood Watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible flood warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ MPS
7 follow-up statements
013 WGUS61 KPHI 230928 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 428 AM EST Wed Dec 23 2020 .Heavy rain will fall on a deep primed snowpack leading to the melt increasing. Flows in rivers may increase quickly and reach critical levels. NJZ008-009-PAZ101>103-105-232100- /O.EXB.KPHI.FA.A.0004.201224T2100Z-201225T1500Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Morris-Hunterdon-Western Chester-Eastern Chester-Western Montgomery- Upper Bucks- Including the cities of Chalfont, Flemington, West Chester, Collegeville, Pottstown, Morristown, Oxford, Perkasie, Honey Brook, and Kennett Square 428 AM EST Wed Dec 23 2020 ...FLOOD WATCH IN EFFECT FROM THURSDAY AFTERNOON THROUGH FRIDAY MORNING... The National Weather Service in Mount Holly has expanded the * Flood Watch to include portions of New Jersey...and southeast Pennsylvania...including the following areas...in New Jersey... Hunterdon and Morris. In southeast Pennsylvania...Eastern Chester, Upper Bucks, Western Chester, and Western Montgomery. * From Thursday afternoon through Friday morning * Heavy rain will move into the region Thursday night, with between 1 and 2 inches of rain over the region and as much as 2 to 3 inches of rain over the southern Poconos. * The heaviest rain will fall over snowpack with as much as an inch of liquid equivalent rainfall, leading to rapid melting of the snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible flood warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ NJZ001-007-PAZ054-055-060>062-232100- /O.EXT.KPHI.FA.A.0004.201224T2100Z-201225T1500Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sussex-Warren-Carbon-Monroe-Berks-Lehigh-Northampton- Including the cities of Jim Thorpe, Allentown, Newton, Washington, Bethlehem, Stroudsburg, Reading, and Easton 428 AM EST Wed Dec 23 2020 ...FLOOD WATCH NOW IN EFFECT FROM THURSDAY AFTERNOON THROUGH FRIDAY MORNING... The Flood Watch is now in effect for * Portions of northern New Jersey...and Pennsylvania...including the following areas...in northern New Jersey...Sussex and Warren. In Pennsylvania...Berks, Carbon, Lehigh, Monroe, and Northampton. * From Thursday afternoon through Friday morning * Heavy rain will move into the region Thursday night, with between 1 and 2 inches of rain over the region and as much as 2 to 3 inches of rain over the southern Poconos. * The heaviest rain will fall over snowpack with as much as an inch of liquid equivalent rainfall, leading to rapid melting of the snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible flood warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ Staarmann
839 WGUS61 KPHI 232035 FFAPHI Flood Watch National Weather Service Mount Holly NJ 335 PM EST Wed Dec 23 2020 .Heavy rain may fall on a deep primed snowpack leading to the melt increasing. Flows in Rivers may increase quickly and reach critical levels. NJZ001-007>009-PAZ054-055-060>062-101>103-105-241100- /O.CON.KPHI.FA.A.0004.201224T2100Z-201225T1500Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sussex-Warren-Morris-Hunterdon-Carbon-Monroe-Berks-Lehigh- Northampton-Western Chester-Eastern Chester-Western Montgomery-Upper Bucks- Including the cities of Chalfont, Honey Brook, Jim Thorpe, Flemington, West Chester, Allentown, Newton, Washington, Collegeville, Pottstown, Morristown, Bethlehem, Stroudsburg, Oxford, Perkasie, Reading, Kennett Square, and Easton 335 PM EST Wed Dec 23 2020 ...FLOOD WATCH REMAINS IN EFFECT FROM THURSDAY AFTERNOON THROUGH FRIDAY MORNING... The Flood Watch continues for * Portions of New Jersey...and Pennsylvania...including the following areas...in New Jersey...Hunterdon, Morris, Sussex, and Warren. In Pennsylvania...Berks, Carbon, Eastern Chester, Lehigh, Monroe, Northampton, Upper Bucks, Western Chester, and Western Montgomery. * From Thursday afternoon through Friday morning * Heavy rain will move into the region late Thursday and Thursday night, with between 1 and 2 inches of rain over the region and as much as 3 to 4 inches of rain over the southern Poconos. * The heaviest rain will fall over snowpack with as much as an inch of liquid equivalent rainfall, leading to rapid melting of the snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible flood warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ MPS
899 WGUS61 KPHI 240828 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 328 AM EST Thu Dec 24 2020 .Heavy rain may fall on a deep primed snowpack leading to the melt increasing. Flows in Rivers may increase quickly and reach critical levels. DEZ001-NJZ010-012-015-PAZ070-071-104-106-241630- /O.EXB.KPHI.FA.A.0004.201224T2100Z-201225T1700Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Somerset-Middlesex-Mercer-Delaware-Philadelphia-Eastern Montgomery-Lower Bucks- Including the cities of Trenton, Lansdale, Media, Morrisville, Wilmington, Philadelphia, Doylestown, Somerville, New Brunswick, and Norristown 328 AM EST Thu Dec 24 2020 ...FLOOD WATCH IN EFFECT FROM THIS AFTERNOON THROUGH FRIDAY MORNING... The National Weather Service in Mount Holly has expanded the * Flood Watch to include portions of northern Delaware...New Jersey...and southeast Pennsylvania...including the following areas...in northern Delaware...New Castle. In New Jersey...Mercer, Middlesex, and Somerset. In southeast Pennsylvania...Delaware, Eastern Montgomery, Lower Bucks, and Philadelphia. * From this afternoon through Friday morning * Heavy rain will move into the region late Thursday and Thursday night, with between 1 and 3 inches of rain over the region and as much as 3 to 4 inches of rain over the southern Poconos. * Excessive rainfall and snowmelt will result in rises on rivers and streams. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible flood warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ NJZ001-007>009-PAZ054-055-060>062-101>103-105-241630- /O.EXT.KPHI.FA.A.0004.201224T2100Z-201225T1700Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sussex-Warren-Morris-Hunterdon-Carbon-Monroe-Berks-Lehigh- Northampton-Western Chester-Eastern Chester-Western Montgomery-Upper Bucks- Including the cities of Chalfont, Honey Brook, Jim Thorpe, Flemington, West Chester, Allentown, Newton, Washington, Collegeville, Pottstown, Morristown, Bethlehem, Stroudsburg, Oxford, Perkasie, Reading, Kennett Square, and Easton 328 AM EST Thu Dec 24 2020 ...FLOOD WATCH NOW IN EFFECT FROM THIS AFTERNOON THROUGH FRIDAY MORNING... The Flood Watch is now in effect for * Portions of New Jersey...and Pennsylvania...including the following areas...in New Jersey...Hunterdon, Morris, Sussex, and Warren. In Pennsylvania...Berks, Carbon, Eastern Chester, Lehigh, Monroe, Northampton, Upper Bucks, Western Chester, and Western Montgomery. * From this afternoon through Friday morning * Heavy rain will move into the region late Thursday and Thursday night, with between 1 and 3 inches of rain over the region and as much as 3 to 4 inches of rain over the southern Poconos. * Excessive rainfall and snowmelt will result in rises on rivers and streams. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible flood warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ Staarmann
072 WGUS61 KPHI 241557 FFAPHI Flood Watch National Weather Service Mount Holly NJ 1057 AM EST Thu Dec 24 2020 .Heavy rain may fall on a deep primed snowpack leading to the melt increasing. Flows in Rivers may increase quickly and reach critical levels. DEZ001-NJZ001-007>010-012-015-PAZ054-055-060>062-070-071-101>106- 250400- /O.CON.KPHI.FA.A.0004.201224T2100Z-201225T1700Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer- Carbon-Monroe-Berks-Lehigh-Northampton-Delaware-Philadelphia-Western Chester-Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Jim Thorpe, Flemington, Media, Philadelphia, Doylestown, Chalfont, Morristown, Honey Brook, Lansdale, Norristown, Reading, Pottstown, Allentown, Oxford, Kennett Square, Easton, West Chester, Morrisville, Wilmington, New Brunswick, Trenton, Newton, Washington, Collegeville, Bethlehem, Stroudsburg, Perkasie, and Somerville 1057 AM EST Thu Dec 24 2020 ...FLOOD WATCH REMAINS IN EFFECT FROM 4 PM EST THIS AFTERNOON THROUGH FRIDAY MORNING... The Flood Watch continues for * Portions of northern Delaware...New Jersey...and Pennsylvania... including the following areas...in northern Delaware...New Castle. In New Jersey...Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex, and Warren. In Pennsylvania...Berks, Carbon, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Monroe, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * From 4 PM EST this afternoon through Friday morning * Heavy rain will move into the region late Thursday and Thursday night, with between 1 and 3 inches of rain over the region and as much as 3 to 4 inches of rain over the southern Poconos. * Excessive rainfall and snowmelt will result in rises on rivers and streams. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible flood warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ MPS
911 WGUS61 KPHI 242016 FFAPHI Flood Watch National Weather Service Mount Holly NJ 316 PM EST Thu Dec 24 2020 .Heavy rain may fall on a deep primed snowpack leading to the melt increasing. Flows in Rivers may increase quickly and reach critical levels. DEZ001-NJZ001-007>010-012-015-PAZ054-055-060>062-070-071-101>106- 250830- /O.CON.KPHI.FA.A.0004.201224T2100Z-201225T1700Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer- Carbon-Monroe-Berks-Lehigh-Northampton-Delaware-Philadelphia-Western Chester-Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Jim Thorpe, Flemington, Media, Philadelphia, Doylestown, Chalfont, Morristown, Honey Brook, Lansdale, Norristown, Reading, Pottstown, Allentown, Oxford, Kennett Square, Easton, West Chester, Morrisville, Wilmington, New Brunswick, Trenton, Newton, Washington, Collegeville, Bethlehem, Stroudsburg, Perkasie, and Somerville 316 PM EST Thu Dec 24 2020 ...FLOOD WATCH REMAINS IN EFFECT THROUGH FRIDAY MORNING... The Flood Watch continues for * Portions of northern Delaware...New Jersey...and Pennsylvania... including the following areas...in northern Delaware...New Castle. In New Jersey...Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex, and Warren. In Pennsylvania...Berks, Carbon, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Monroe, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * Through Friday morning * Heavy rain will move into the region tonight, with between 1 and 3 inches of rain over the region and as much as 3 to 4 inches of rain over the southern Poconos. * Excessive rainfall and snowmelt will result in rises on rivers and streams. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible flood warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ MPS
017 WGUS61 KPHI 250743 FFAPHI Flood Watch National Weather Service Mount Holly NJ 243 AM EST Fri Dec 25 2020 .Earlier heavy rain and snow melt has lead to flooding over portions of the region. Flows in Rivers may increase quickly and reach critical levels. DEZ001-NJZ001-007>010-012-015-PAZ054-055-060>062-070-071-101>106- 251700- /O.CON.KPHI.FA.A.0004.000000T0000Z-201225T1700Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer- Carbon-Monroe-Berks-Lehigh-Northampton-Delaware-Philadelphia-Western Chester-Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Jim Thorpe, Flemington, Media, Philadelphia, Doylestown, Chalfont, Morristown, Honey Brook, Lansdale, Norristown, Reading, Pottstown, Allentown, Oxford, Kennett Square, Easton, West Chester, Morrisville, Wilmington, New Brunswick, Trenton, Newton, Washington, Collegeville, Bethlehem, Stroudsburg, Perkasie, and Somerville 243 AM EST Fri Dec 25 2020 ...FLOOD WATCH REMAINS IN EFFECT UNTIL NOON EST TODAY... The Flood Watch continues for * Portions of northern Delaware...New Jersey...and Pennsylvania... including the following areas...in northern Delaware...New Castle. In New Jersey...Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex, and Warren. In Pennsylvania...Berks, Carbon, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Monroe, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * Until Noon EST today * Widespread 1 to 3 inches fell earlier tonight, and some lingering light rain will continue through this morning. Flooding is already ongoing in several locations, therefore, the flood watch continues across the region. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible flood warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ SFJ
683 WGUS61 KPHI 251436 FFAPHI Flood Watch National Weather Service Mount Holly NJ 936 AM EST Fri Dec 25 2020 DEZ001-NJZ001-007>010-012-015-PAZ054-055-060>062-070-071-101>106- 251545- /O.CAN.KPHI.FA.A.0004.000000T0000Z-201225T1700Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer- Carbon-Monroe-Berks-Lehigh-Northampton-Delaware-Philadelphia-Western Chester-Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Jim Thorpe, Flemington, Media, Philadelphia, Doylestown, Chalfont, Morristown, Honey Brook, Lansdale, Norristown, Reading, Pottstown, Allentown, Oxford, Kennett Square, Easton, West Chester, Morrisville, Wilmington, New Brunswick, Trenton, Newton, Washington, Collegeville, Bethlehem, Stroudsburg, Perkasie, and Somerville 936 AM EST Fri Dec 25 2020 ...FLOOD WATCH IS CANCELLED... The Flood Watch for portions of northern Delaware...New Jersey...and Pennsylvania...including the following areas...in northern Delaware...New Castle. In New Jersey...Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex, and Warren. In Pennsylvania...Berks, Carbon, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Monroe, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery has been cancelled. The Flood Watch is cancelled. There are existing Flood Warnings in place, so please continue to heed remaining road closures. $$ MPS
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 22, 3:19 PM EST | Gale Watch | PHI | 24 hr |
Nearby
Flood Watches in Pennsylvania, 2020Flood Watches in New Jersey, 2020Flood Watches in Delaware, 2020Every flood watch in 2020
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.