Alert archive / New Jersey / Heat Advisories in 2025
Heat Advisory 9, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this heat advisory at Jul 28, 2025, 3:00 AM EDT for 10 counties in Pennsylvania; 12 counties in New Jersey; New Castle County, Delaware. It took effect at Jul 28, 2025, 11:00 AM EDT. It was in force for 57 hr.
The area
The counties it named.
The facts
- Issued
- Jul 28, 2025, 3:00 AM EDT (07:00 UTC)
- In effect from
- Jul 28, 2025, 11:00 AM EDT
- Expired
- Jul 30, 2025, 8:00 PM EDT
- In force
- 57 hr
- Issued by
- NWS Philadelphia/Mount Holly
All 23 counties
New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean 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), 71 km from the middle of the area, began a volume at 07:01 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, 7.0 hours before the alert went out and 194 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
- 728 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 563 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 135 m²/s²
- 0-3 km storm-relative helicity
- 171 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 3.7
The text
As transmitted.
752 WWUS71 KPHI 280700 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 300 AM EDT Mon Jul 28 2025 DEZ001-NJZ008>010-012-013-015-017>020-027-PAZ070-071-103>106-282000- /O.NEW.KPHI.HT.Y.0009.250728T1500Z-250731T0000Z/ New Castle-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth- Mercer-Gloucester-Camden-Northwestern Burlington-Ocean- Southeastern Burlington-Delaware-Philadelphia-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Moorestown, Pottstown, Wilmington, Media, Norristown, Jackson, Freehold, Mount Holly, Wharton State Forest, Collegeville, Cherry Hill, Perkasie, Philadelphia, Flemington, Chalfont, Lansdale, Doylestown, Camden, Glassboro, Morristown, Trenton, New Brunswick, Somerville, and Morrisville 300 AM EDT Mon Jul 28 2025 ...HEAT ADVISORY IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT WEDNESDAY... * WHAT...Heat index values up to 104 degrees expected. * WHERE...Portions of northern Delaware, central, northern, northwest, and southern New Jersey, and southeast Pennsylvania. * WHEN...From 11 AM this morning to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. && $$ NJZ001-007-PAZ054-055-060>062-101-102-282000- /O.NEW.KPHI.HT.Y.0009.250729T1500Z-250731T0000Z/ Sussex-Warren-Carbon-Monroe-Berks-Lehigh-Northampton-Western Chester-Eastern Chester- Including the cities of Kennett Square, Allentown, Stroudsburg, Oxford, Easton, Newton, Jim Thorpe, Washington, Honey Brook, Bethlehem, West Chester, and Reading 300 AM EDT Mon Jul 28 2025 ...HEAT ADVISORY IN EFFECT FROM 11 AM TUESDAY TO 8 PM EDT WEDNESDAY... * WHAT...Heat index values up to 103 degrees expected. * WHERE...In New Jersey, Sussex and Warren Counties. In Pennsylvania, Berks, Lehigh, Northampton, Carbon, Monroe, Eastern Chester, and Western Chester Counties. * WHEN...From 11 AM Tuesday to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ014-026-282000- /O.NEW.KPHI.HT.Y.0009.250729T1500Z-250731T0000Z/ Eastern Monmouth-Coastal Ocean- Including the cities of Long Beach Island and Sandy Hook 300 AM EDT Mon Jul 28 2025 ...HEAT ADVISORY IN EFFECT FROM 11 AM TUESDAY TO 8 PM EDT WEDNESDAY... * WHAT...Heat index values up to 102 degrees expected. * WHERE...Eastern Monmouth and Coastal Ocean Counties. * WHEN...From 11 AM Tuesday to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. && $$ AKL
6 follow-up statements
562 WWUS71 KPHI 281825 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 225 PM EDT Mon Jul 28 2025 DEZ001-NJZ008>010-012-013-015-017>020-027-PAZ070-071-103>106-291000- /O.CON.KPHI.HT.Y.0009.000000T0000Z-250731T0000Z/ New Castle-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth- Mercer-Gloucester-Camden-Northwestern Burlington-Ocean- Southeastern Burlington-Delaware-Philadelphia-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Trenton, Chalfont, Wilmington, Glassboro, Freehold, Morristown, Camden, Lansdale, Doylestown, Jackson, Flemington, Norristown, Pottstown, Somerville, New Brunswick, Morrisville, Collegeville, Mount Holly, Media, Wharton State Forest, Philadelphia, Moorestown, Perkasie, and Cherry Hill 225 PM EDT Mon Jul 28 2025 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT WEDNESDAY... * WHAT...Heat index values up to 104. * WHERE...Portions of northern Delaware, New Jersey, and southeast Pennsylvania. * WHEN...Until 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ001-007-PAZ054-055-060>062-101-102-291000- /O.CON.KPHI.HT.Y.0009.250729T1500Z-250731T0000Z/ Sussex-Warren-Carbon-Monroe-Berks-Lehigh-Northampton-Western Chester-Eastern Chester- Including the cities of Oxford, Newton, Stroudsburg, Allentown, West Chester, Washington, Easton, Bethlehem, Jim Thorpe, Honey Brook, Kennett Square, and Reading 225 PM EDT Mon Jul 28 2025 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TUESDAY TO 8 PM EDT WEDNESDAY... * WHAT...Heat index values up to 102 expected. * WHERE...In New Jersey, Sussex and Warren Counties. In Pennsylvania, Berks, Lehigh, Northampton, Carbon, Monroe, Eastern Chester, and Western Chester Counties. * WHEN...From 11 AM Tuesday to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ014-026-291000- /O.CON.KPHI.HT.Y.0009.250729T1500Z-250731T0000Z/ Eastern Monmouth-Coastal Ocean- Including the cities of Long Beach Island and Sandy Hook 225 PM EDT Mon Jul 28 2025 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TUESDAY TO 8 PM EDT WEDNESDAY... * WHAT...Heat index values up to 102 expected. * WHERE...Eastern Monmouth and Coastal Ocean Counties. * WHEN...From 11 AM Tuesday to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ MPS
516 WWUS71 KPHI 290812 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 412 AM EDT Tue Jul 29 2025 DEZ001-NJZ008>010-012-013-015-017>020-027-PAZ070-071-103>106-292100- /O.CON.KPHI.HT.Y.0009.000000T0000Z-250731T0000Z/ New Castle-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth- Mercer-Gloucester-Camden-Northwestern Burlington-Ocean- Southeastern Burlington-Delaware-Philadelphia-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Camden, New Brunswick, Wilmington, Perkasie, Freehold, Cherry Hill, Lansdale, Chalfont, Glassboro, Moorestown, Doylestown, Jackson, Philadelphia, Somerville, Wharton State Forest, Trenton, Pottstown, Mount Holly, Norristown, Flemington, Morristown, Morrisville, Collegeville, and Media 412 AM EDT Tue Jul 29 2025 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT WEDNESDAY... * WHAT...Heat index values up to 104 degrees expected. * WHERE...Portions of northern Delaware, central, northern, northwest, and southern New Jersey, and southeast Pennsylvania. * WHEN...Until 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ001-007-PAZ054-055-060>062-101-102-292100- /O.CON.KPHI.HT.Y.0009.250729T1500Z-250731T0000Z/ Sussex-Warren-Carbon-Monroe-Berks-Lehigh-Northampton-Western Chester-Eastern Chester- Including the cities of Jim Thorpe, Easton, Newton, Stroudsburg, Allentown, Honey Brook, Bethlehem, Kennett Square, Washington, Reading, Oxford, and West Chester 412 AM EDT Tue Jul 29 2025 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT WEDNESDAY... * WHAT...Heat index values up to 103 degrees expected. * WHERE...In New Jersey, Sussex and Warren Counties. In Pennsylvania, Berks, Lehigh, Northampton, Carbon, Monroe, Eastern Chester, and Western Chester Counties. * WHEN...From 11 AM this morning to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ014-026-292100- /O.CON.KPHI.HT.Y.0009.250729T1500Z-250731T0000Z/ Eastern Monmouth-Coastal Ocean- Including the cities of Sandy Hook and Long Beach Island 412 AM EDT Tue Jul 29 2025 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT WEDNESDAY... * WHAT...Heat index values up to 102 degrees expected. * WHERE...Eastern Monmouth and Coastal Ocean Counties. * WHEN...From 11 AM this morning to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ Staarmann
368 WWUS71 KPHI 291846 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 246 PM EDT Tue Jul 29 2025 DEZ001-NJZ008>010-012-013-015-017>020-027-PAZ070-071-103>106-301000- /O.CON.KPHI.HT.Y.0009.000000T0000Z-250731T0000Z/ New Castle-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth- Mercer-Gloucester-Camden-Northwestern Burlington-Ocean- Southeastern Burlington-Delaware-Philadelphia-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Moorestown, New Brunswick, Chalfont, Trenton, Cherry Hill, Collegeville, Glassboro, Doylestown, Freehold, Philadelphia, Somerville, Media, Wilmington, Pottstown, Perkasie, Morristown, Jackson, Wharton State Forest, Camden, Lansdale, Norristown, Mount Holly, Morrisville, and Flemington 246 PM EDT Tue Jul 29 2025 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT WEDNESDAY... * WHAT...Heat index values up to 104. * WHERE...Portions of northern Delaware, central, northern, northwest, and southern New Jersey, and southeast Pennsylvania. * WHEN...Until 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ001-007-PAZ054-055-060>062-101-102-301000- /O.CON.KPHI.HT.Y.0009.000000T0000Z-250731T0000Z/ Sussex-Warren-Carbon-Monroe-Berks-Lehigh-Northampton-Western Chester-Eastern Chester- Including the cities of Kennett Square, Newton, Jim Thorpe, Bethlehem, Washington, Easton, Oxford, Allentown, Reading, West Chester, Honey Brook, and Stroudsburg 246 PM EDT Tue Jul 29 2025 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT WEDNESDAY... * WHAT...Heat index values up to 103. * WHERE...In New Jersey, Sussex and Warren Counties. In Pennsylvania, Berks, Lehigh, Northampton, Carbon, Monroe, Eastern Chester, and Western Chester Counties. * WHEN...Until 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ014-026-301000- /O.CON.KPHI.HT.Y.0009.000000T0000Z-250731T0000Z/ Eastern Monmouth-Coastal Ocean- Including the cities of Sandy Hook and Long Beach Island 246 PM EDT Tue Jul 29 2025 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT WEDNESDAY... * WHAT...Heat index values up to 102. * WHERE...Eastern Monmouth and Coastal Ocean Counties. * WHEN...Until 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ PO
251 WWUS71 KPHI 300801 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 401 AM EDT Wed Jul 30 2025 DEZ001-NJZ008>010-012-013-015-017>020-027-PAZ070-071-103>106-310000- /O.CON.KPHI.HT.Y.0009.000000T0000Z-250731T0000Z/ New Castle-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth- Mercer-Gloucester-Camden-Northwestern Burlington-Ocean- Southeastern Burlington-Delaware-Philadelphia-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of New Brunswick, Trenton, Flemington, Perkasie, Mount Holly, Glassboro, Doylestown, Morristown, Wilmington, Pottstown, Norristown, Cherry Hill, Freehold, Wharton State Forest, Media, Morrisville, Philadelphia, Chalfont, Camden, Lansdale, Moorestown, Jackson, Somerville, and Collegeville 401 AM EDT Wed Jul 30 2025 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 104 degrees expected. * WHERE...Portions of northern Delaware, central, northern, northwest, and southern New Jersey, and southeast Pennsylvania. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ001-007-PAZ054-055-060>062-101-102-310000- /O.CON.KPHI.HT.Y.0009.000000T0000Z-250731T0000Z/ Sussex-Warren-Carbon-Monroe-Berks-Lehigh-Northampton-Western Chester-Eastern Chester- Including the cities of Allentown, West Chester, Reading, Bethlehem, Jim Thorpe, Washington, Oxford, Stroudsburg, Honey Brook, Kennett Square, Newton, and Easton 401 AM EDT Wed Jul 30 2025 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 103 degrees expected. * WHERE...In New Jersey, Sussex and Warren Counties. In Pennsylvania, Berks, Lehigh, Northampton, Carbon, Monroe, Eastern Chester, and Western Chester Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ014-026-310000- /O.CON.KPHI.HT.Y.0009.000000T0000Z-250731T0000Z/ Eastern Monmouth-Coastal Ocean- Including the cities of Long Beach Island and Sandy Hook 401 AM EDT Wed Jul 30 2025 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 102 degrees expected. * WHERE...Eastern Monmouth and Coastal Ocean Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ Staarmann
565 WWUS71 KPHI 301811 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 211 PM EDT Wed Jul 30 2025 DEZ001-NJZ008>010-012-013-015-017>020-027-PAZ070-071-103>106-310000- /O.CON.KPHI.HT.Y.0009.000000T0000Z-250731T0000Z/ New Castle-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth- Mercer-Gloucester-Camden-Northwestern Burlington-Ocean- Southeastern Burlington-Delaware-Philadelphia-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Moorestown, Pottstown, Jackson, Trenton, Perkasie, Doylestown, Morrisville, Glassboro, Norristown, Camden, Somerville, Cherry Hill, Mount Holly, New Brunswick, Lansdale, Morristown, Media, Flemington, Chalfont, Wilmington, Freehold, Philadelphia, Collegeville, and Wharton State Forest 211 PM EDT Wed Jul 30 2025 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 105. * WHERE...Portions of northern Delaware, New Jersey, and southeast Pennsylvania. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ001-007-PAZ054-055-060>062-101-102-310000- /O.CON.KPHI.HT.Y.0009.000000T0000Z-250731T0000Z/ Sussex-Warren-Carbon-Monroe-Berks-Lehigh-Northampton-Western Chester-Eastern Chester- Including the cities of West Chester, Stroudsburg, Oxford, Jim Thorpe, Kennett Square, Allentown, Honey Brook, Washington, Easton, Reading, Bethlehem, and Newton 211 PM EDT Wed Jul 30 2025 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 103. * WHERE...In New Jersey, Sussex and Warren Counties. In Pennsylvania, Berks, Lehigh, Northampton, Carbon, Monroe, Eastern Chester, and Western Chester Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ014-026-310000- /O.CON.KPHI.HT.Y.0009.000000T0000Z-250731T0000Z/ Eastern Monmouth-Coastal Ocean- Including the cities of Sandy Hook and Long Beach Island 211 PM EDT Wed Jul 30 2025 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 104. * WHERE...Eastern Monmouth and Coastal Ocean Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ MPS
022 WWUS71 KPHI 302355 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 755 PM EDT Wed Jul 30 2025 DEZ001-NJZ001-007>010-012>015-017>020-026-027-PAZ054-055-060>062-070- 071-101>106-310100- /O.EXP.KPHI.HT.Y.0009.000000T0000Z-250731T0000Z/ New Castle-Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex- Western Monmouth-Eastern Monmouth-Mercer-Gloucester-Camden- Northwestern Burlington-Ocean-Coastal Ocean-Southeastern Burlington-Carbon-Monroe-Berks-Lehigh-Northampton-Delaware- Philadelphia-Western Chester-Eastern Chester-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Flemington, Somerville, Oxford, Media, Bethlehem, Chalfont, Allentown, Trenton, Mount Holly, Long Beach Island, Sandy Hook, Stroudsburg, Wharton State Forest, Easton, Kennett Square, Honey Brook, Glassboro, Doylestown, Washington, Morrisville, Collegeville, Pottstown, Freehold, Reading, Cherry Hill, Camden, Newton, Jackson, Jim Thorpe, Norristown, Lansdale, Morristown, Wilmington, Moorestown, Perkasie, New Brunswick, Philadelphia, and West Chester 755 PM EDT Wed Jul 30 2025 ...HEAT ADVISORY WILL EXPIRE AT 8 PM EDT THIS EVENING... Heat index values remain hot and humid this evening but are slowly coming down below heat advisory thresholds. Continue to take extra precautions when outside and limit strenuous activities this evening. $$ Deal
What forecasters said that day
The local office's own words before this heat 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 heat advisory went out at Jul 28, 1:44 AM EDT, 1 hour 16 minutes earlier.
Area forecast discussion, Jul 28, 1:44 AM EDT, 1 hour 16 minutes before
Area Forecast Discussion National Weather Service Mount Holly NJ 144 AM EDT Mon Jul 28 2025 .SYNOPSIS... High pressure for the early part of the upcoming week. A cold front arrives during the midweek period. More high pressure should be across the region for late next week and into next weekend. && .NEAR TERM /THROUGH TODAY/... Overnight, conditions look to remain dry in the wake of a front crossing the region. Some fog will develop overnight with residual moisture lingering and light winds behind the front. Not confident of dense fog at the moment, so we'll broad brush the patchy for in the grids. Humid and muggy overnight with lows in the 70s. Light West to Northwest winds. For Monday, the front will have crossed the area and high pressure from the Ohio Valley will begin to build in. Upper heights will be increasing too, so fair weather and hot temperatures are expected. Dew points will still be uncomfortable (in the low 70s) but a little less than the past few days (when we had mid/upper 70s). For this reason, heat index values mostly settle in the upper 90s and low 100's for Delmarva. These numbers are just a few degrees short of Heat Advisory criteria. We'll hold on any heat headlines for now with the idea being that even lower dew points are possible. Winds will be North to Northwest during the day at around 10mph. At the shore, a sea- breeze is expected for the afternoon. && .SHORT TERM /TONIGHT THROUGH WEDNESDAY/... The short term period as a whole will feature mostly dry conditions under mostly sunny/partly cloudy skies as broad high pressure builds into the region from the south. Perhaps a stray shower or storm is possible on Tuesday, with more in the way of isolated storms and increasing clouds on Wednesday ahead of a cold front. The more notable part of the mid-week period will be another round of potentially dangerous heat and humidity setting up across the area. High temperatures on both Tuesday and Wednesday are forecast to be in the mid to upper 90s with dew points in the low to mid 70s both days. This will result in heat indicies around 100-105+ degrees across most of the area; where Wednesday now looks to be the warmest day. Likely will need some sort of heat headlines on Tuesday and Wednesday in the coming days. && .LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/... The most notable change to the long term period is with regards to the timing of the arrival of the strong cold front that will be tracking through the region. Latest guidance further delays this arrival, with the front now moving into the area late Wednesday night into Thursday. As stated above, much of the day Wednesday now looks quite dry, with increasing chances for showers and storms beginning Wednesday night and continuing through Thursday. Still, much of the machine learning guidance hints at the potential for severe weather for both Wednesday night and Thursday, however the extent of this is uncertain. If the front moves in at night, this will likely hinder the extent of severe weather potential compared to maximizing diurnal heating during the day. Will need to continue to monitor this trend and potential in the coming days. Regardless, this does look like the next opportunity to bring some widespread rain and storms to the area. Also, PWATs are expected to be in excess of 2", which may exacerbate the flash flood risk especially if any training occurs. Due to this, WPC has portions of the region in a MARGINAL risk of excessive rainfall on Wednesday with a MARGINAL and SLIGHT risk of excessive rainfall on Thursday. By Friday, depending on the forward progression of the front, there will likely be some lingering shower activity around through Friday, especially across the Delmarva. Fortunately, by the time the weekend rolls around, we should see some drastic improvements across the area with strong high pressure building over the Great Lakes. This will result in dry conditions with temperatures expected to be as much as 5-10 degrees below average over the weekend. && .AVIATION /06Z MONDAY THROUGH FRIDAY/... The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas. Tonight...Mainly VFR. Mist/patchy fog expected overnight with some MVFR vsbys forecast in the terminals. Lower conditions possible but high uncertainty. Low confidence. Monday... Early morning mist/fog then VFR with sunny skies expected. North winds 5 to 10 knots becoming West during the afternoon. High confid. Outlook... Monday night through Wednesday...VFR. No significant weather expected. Wednesday night through Friday...Sub-VFR conditions probable with showers likely. A chance for showers and thunderstorms possible in each afternoon and evening. && .MARINE... Overnight, winds continue to veer as a front crosses the waters. By Monday morning, winds will be more North or Northeast. Speeds will be around 10 to 15 knots on the ocean into the evening then less than 10 knots overnight and much of Monday. Sub-SCA expected. Outlook... Monday night through Thursday...No marine headlines expected. Winds will largely remain below 20 kt with seas around 2 feet or less. Fair weather expected through Wednesday with showers and thunderstorms for Wednesday night into Thursday. Thursday night through Friday...SCA conditions probable due to winds around 25 kt and seas building to 3-5 feet. Showers and thunderstorms possible. Rip Currents... For Monday, winds start northerly and then turn easterly around 5 to 10 MPH. Breakers will be around 1 foot. Period will be 4 to 8 seconds. As a result, a LOW risk for rip currents is in place at all beaches. For Tuesday, winds turn southwesterly around 5 to 10 MPH. Breakers will remain around 1 foot. Period will remain 4 to 8 seconds. As a result, a LOW risk for rip currents is in place at all beaches. For specific beach forecasts, visit weather.gov/beach/phi && .CLIMATE... Several days of high heat will commence Monday and continue through Wednesday. Here's a rundown of record warm high and low temperatures. Record warm high temperatures Site Monday 7/28 Tuesday 7/29 Wednesday 7/30 AC Marina (55N) 96 in 1999 96 in 2002 99 in 2002 AC Airport (ACY) 98 in 1999 98 in 2002 96 in 2002 Allentown (ABE) 97 in 1949 96 in 1954 97 in 1940 Georgetown (GED) 99 in 1949 99 in 2011 99 in 1949 Mount Pocono (MPO) 93 in 1949 90 in 1949 90 in 1954 Philadelphia (PHL) 100 in 1941 98 in 2002 98 in 1988 Reading (RDG) 99 in 1941 97 in 2002 97 in 1940 Trenton (TTN) 98 in 1940 100 in 1894 98 in 1999 Wilmington (ILG) 101 in 1894 99 in 1896 97 in 1954 Record warm low temperatures Site Monday 7/28 Tuesday 7/29 Wednesday 7/30 AC Marina (55N) 78 in 2020 78 in 2020 79 in 2020 AC Airport (ACY) 80 in 2020 78 in 2002 76 in 2015 Allentown (ABE) 75 in 1934 75 in 2002 74 in 2024 Georgetown (GED) 76 in 2022 78 in 2011 78 in 2009 Mount Pocono (MPO) 69 in 1955 71 in 2002 68 in 1909 Philadelphia (PHL) 79 in 2020 81 in 1995 80 in 2002 Reading (RDG) 78 in 1949 78 in 1949 75 in 1933 Trenton (TTN) 78 in 1894 80 in 1894 78 in 1894 Wilmington (ILG) 76 in 2020 82 in 1894 75 in 2019 && .PHI WATCHES/WARNINGS/ADVISORIES... PA...None. NJ...None. DE...None. MD...None. MARINE...None. && SYNOPSIS...DeSilva/OHara NEAR TERM...AKL/OHara SHORT TERM...DeSilva LONG TERM...DeSilva AVIATION...AKL/DeSilva/OHara/RCM MARINE...AKL/DeSilva/OHara/RCM/Robertson CLIMATE...WFO PHI
Hazardous weather outlook, Jul 27, 3:44 PM EDT, 11 hours 16 minutes before
Hazardous Weather Outlook National Weather Service Mount Holly NJ 344 PM EDT Sun Jul 27 2025 MDZ012-015-019-020-281945- Kent MD-Queen Annes-Talbot-Caroline- 344 PM EDT Sun Jul 27 2025 This Hazardous Weather Outlook is for northeast Maryland. .DAY ONE...This afternoon and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Heat index values over 100 will be possible for Tuesday and Wednesday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
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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.