Alert archive / New Jersey / Heat Advisories in 2026
Heat Advisory 2, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this heat advisory at Jun 10, 2026, 2:24 AM EDT for New Castle County, Delaware; 12 counties in New Jersey; 8 counties in Pennsylvania. It took effect at Jun 11, 2026, 11:00 AM EDT. It was in force for 33 hr.
The area
The counties it named.
The facts
- Issued
- Jun 10, 2026, 2:24 AM EDT (06:24 UTC)
- In effect from
- Jun 11, 2026, 11:00 AM EDT
- Expired
- Jun 12, 2026, 8:00 PM EDT
- In force
- 33 hr
- Issued by
- NWS Philadelphia/Mount Holly
All 21 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, Chester County, PA, Delaware County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 64 km from the middle of the area, began a volume at 06:25 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, 6.4 hours before the alert went out and 192 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
- 1966 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 120 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
054 WWUS71 KPHI 100624 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 224 AM EDT Wed Jun 10 2026 DEZ001-NJZ015-017>019-PAZ070-071-102-104-106-102000- /O.NEW.KPHI.HT.Y.0002.260611T1500Z-260613T0000Z/ New Castle-Mercer-Gloucester-Camden-Northwestern Burlington- Delaware-Philadelphia-Eastern Chester-Eastern Montgomery-Lower Bucks- Including the cities of Kennett Square, Doylestown, Media, Wilmington, Mount Holly, Lansdale, Morrisville, Norristown, Glassboro, Cherry Hill, Philadelphia, Camden, West Chester, Trenton, and Moorestown 224 AM EDT Wed Jun 10 2026 ...HEAT ADVISORY IN EFFECT FROM 11 AM THURSDAY TO 8 PM EDT FRIDAY... * WHAT...Heat index values up to 103 degrees expected. * WHERE...In Delaware, New Castle County. In New Jersey, Mercer, Camden, Gloucester, and Northwestern Burlington Counties. In Pennsylvania, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, and Philadelphia Counties. * WHEN...From 11 AM Thursday to 8 PM EDT Friday. * 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. If you do not have air conditioning in your home or lack shelter, you can call 211, or visit your county or state health department website for assistance locating appropriate shelter from the heat. && $$ NJZ001-007>010-012-013-020-027-102000- /O.NEW.KPHI.HT.Y.0002.260611T1500Z-260613T0000Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-Ocean-Southeastern Burlington- Including the cities of New Brunswick, Wharton State Forest, Morristown, Jackson, Freehold, Washington, Newton, Flemington, and Somerville 224 AM EDT Wed Jun 10 2026 ...HEAT ADVISORY IN EFFECT FROM 11 AM THURSDAY TO 8 PM EDT FRIDAY... * WHAT...Heat index values up to 102 degrees expected. * WHERE...Western Monmouth, Middlesex, Morris, Somerset, Sussex, Warren, Hunterdon, Ocean, and Southeastern Burlington Counties. * WHEN...From 11 AM Thursday to 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. && $$ NJZ014-102000- /O.NEW.KPHI.HT.Y.0002.260611T1500Z-260612T0000Z/ Eastern Monmouth- Including the cities of Sandy Hook 224 AM EDT Wed Jun 10 2026 ...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY... * WHAT...Heat index values up to 100 degrees expected. * WHERE...Eastern Monmouth County. * WHEN...From 11 AM to 8 PM EDT Thursday. * 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. && $$ PAZ060>062-101-103-105-102000- /O.NEW.KPHI.HT.Y.0002.260611T1500Z-260613T0000Z/ Berks-Lehigh-Northampton-Western Chester-Western Montgomery-Upper Bucks- Including the cities of Collegeville, Perkasie, Oxford, Honey Brook, Allentown, Bethlehem, Reading, Chalfont, Easton, and Pottstown 224 AM EDT Wed Jun 10 2026 ...HEAT ADVISORY IN EFFECT FROM 11 AM THURSDAY TO 8 PM EDT FRIDAY... * WHAT...Heat index values up to 101 degrees expected. * WHERE...Berks, Lehigh, Northampton, Upper Bucks, Western Chester, and Western Montgomery Counties. * WHEN...From 11 AM Thursday to 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. && $$ Staarmann
6 follow-up statements
125 WWUS71 KPHI 101836 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 236 PM EDT Wed Jun 10 2026 DEZ001-NJZ015-017>019-PAZ070-071-102-104-106-110900- /O.CON.KPHI.HT.Y.0002.260611T1500Z-260613T0000Z/ New Castle-Mercer-Gloucester-Camden-Northwestern Burlington- Delaware-Philadelphia-Eastern Chester-Eastern Montgomery-Lower Bucks- Including the cities of Trenton, Doylestown, Moorestown, Camden, Kennett Square, Morrisville, Glassboro, Media, Lansdale, Mount Holly, West Chester, Norristown, Wilmington, Cherry Hill, and Philadelphia 236 PM EDT Wed Jun 10 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THURSDAY TO 8 PM EDT FRIDAY... * WHAT...Heat index values up to 104 degrees expected. * WHERE...In Delaware, New Castle County. In New Jersey, Mercer, Camden, Gloucester, and Northwestern Burlington Counties. In Pennsylvania, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, and Philadelphia Counties. * WHEN...From 11 AM Thursday to 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Some showers and thunderstorms later Thursday afternoon and again later Friday afternoon will provide some local relief from the heat, however it will still remain very humid. It will then turn much less humid this weekend in the wake of a cold front. 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. If you do not have air conditioning in your home or lack shelter, you can call 211, or visit your county or state health department website for assistance locating appropriate shelter from the heat. && $$ NJZ001-007>010-012-013-020-027-110900- /O.CON.KPHI.HT.Y.0002.260611T1500Z-260613T0000Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-Ocean-Southeastern Burlington- Including the cities of Somerville, Freehold, Newton, Washington, Morristown, Jackson, Wharton State Forest, Flemington, and New Brunswick 236 PM EDT Wed Jun 10 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THURSDAY TO 8 PM EDT FRIDAY... * WHAT...Heat index values up to 102 degrees expected. * WHERE...Western Monmouth, Middlesex, Morris, Somerset, Sussex, Warren, Hunterdon, Ocean, and Southeastern Burlington Counties. * WHEN...From 11 AM Thursday to 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Some showers and thunderstorms later Thursday afternoon and again later Friday afternoon will provide some local relief from the heat, however it will still remain very humid. It will then turn much less humid this weekend in the wake of a cold front. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. && $$ NJZ014-110900- /O.CON.KPHI.HT.Y.0002.260611T1500Z-260612T0000Z/ Eastern Monmouth- Including the cities of Sandy Hook 236 PM EDT Wed Jun 10 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY... * WHAT...Heat index values up to 100 degrees expected. * WHERE...Eastern Monmouth County. * WHEN...From 11 AM to 8 PM EDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Some showers and thunderstorms late Thursday afternoon and again late Friday afternoon will provide some local relief from the heat, however it will still remain very humid. It will then turn much less humid this weekend in the wake of a cold front. 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. && $$ PAZ060>062-101-103-105-110900- /O.CON.KPHI.HT.Y.0002.260611T1500Z-260613T0000Z/ Berks-Lehigh-Northampton-Western Chester-Western Montgomery-Upper Bucks- Including the cities of Honey Brook, Oxford, Chalfont, Reading, Collegeville, Perkasie, Pottstown, Easton, Bethlehem, and Allentown 236 PM EDT Wed Jun 10 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THURSDAY TO 8 PM EDT FRIDAY... * WHAT...Heat index values up to 102 degrees expected. * WHERE...Berks, Lehigh, Northampton, Upper Bucks, Western Chester, and Western Montgomery Counties. * WHEN...From 11 AM Thursday to 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Some showers and thunderstorms later Thursday afternoon and again later Friday afternoon will provide some local relief from the heat, however it will still remain very humid. It will then turn much less humid this weekend in the wake of a cold front. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. && $$ Gorse
779 WWUS71 KPHI 110651 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 251 AM EDT Thu Jun 11 2026 NJZ014-112000- /O.EXT.KPHI.HT.Y.0002.260611T1500Z-260613T0000Z/ Eastern Monmouth- Including the cities of Sandy Hook 251 AM EDT Thu Jun 11 2026 ...HEAT ADVISORY NOW IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT FRIDAY... * WHAT...Heat index values up to 102 degrees expected. * WHERE...Eastern Monmouth County. * WHEN...From 11 AM this morning to 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Some showers and thunderstorms late this afternoon and again late Friday afternoon will provide some local relief from the heat, however it will still remain very humid. It will then turn much less humid this weekend in the wake of a cold front. 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. && $$ DEZ001-NJZ015-017>019-PAZ070-071-102-104-106-112000- /O.CON.KPHI.HT.Y.0002.260611T1500Z-260613T0000Z/ New Castle-Mercer-Gloucester-Camden-Northwestern Burlington- Delaware-Philadelphia-Eastern Chester-Eastern Montgomery-Lower Bucks- Including the cities of Moorestown, West Chester, Norristown, Trenton, Wilmington, Mount Holly, Glassboro, Doylestown, Morrisville, Cherry Hill, Media, Philadelphia, Lansdale, Camden, and Kennett Square 251 AM EDT Thu Jun 11 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT FRIDAY... * WHAT...Heat index values up to 104 degrees expected. * WHERE...In Delaware, New Castle County. In New Jersey, Mercer, Camden, Gloucester, and Northwestern Burlington Counties. In Pennsylvania, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, and Philadelphia Counties. * WHEN...From 11 AM this morning to 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Some showers and thunderstorms late this afternoon and again late Friday afternoon will provide some local relief from the heat, however it will still remain very humid. It will then turn much less humid this weekend in the wake of a cold front. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. If you do not have air conditioning in your home or lack shelter, you can call 211, or visit your county or state health department website for assistance locating appropriate shelter from the heat. && $$ NJZ001-007>010-012-013-020-027-112000- /O.CON.KPHI.HT.Y.0002.260611T1500Z-260613T0000Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-Ocean-Southeastern Burlington- Including the cities of Morristown, Wharton State Forest, Jackson, Washington, New Brunswick, Somerville, Newton, Freehold, and Flemington 251 AM EDT Thu Jun 11 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT FRIDAY... * WHAT...Heat index values up to 103 degrees expected. * WHERE...Western Monmouth, Middlesex, Morris, Somerset, Sussex, Warren, Hunterdon, Ocean, and Southeastern Burlington Counties. * WHEN...From 11 AM this morning to 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Some showers and thunderstorms late this afternoon and again late Friday afternoon will provide some local relief from the heat, however it will still remain very humid. It will then turn much less humid this weekend in the wake of a cold front. 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. && $$ PAZ060>062-101-103-105-112000- /O.CON.KPHI.HT.Y.0002.260611T1500Z-260613T0000Z/ Berks-Lehigh-Northampton-Western Chester-Western Montgomery-Upper Bucks- Including the cities of Oxford, Reading, Perkasie, Collegeville, Chalfont, Bethlehem, Pottstown, Easton, Honey Brook, and Allentown 251 AM EDT Thu Jun 11 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT FRIDAY... * WHAT...Heat index values up to 102 degrees expected. * WHERE...Berks, Lehigh, Northampton, Upper Bucks, Western Chester, and Western Montgomery Counties. * WHEN...From 11 AM this morning to 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Some showers and thunderstorms late this afternoon and again late Friday afternoon will provide some local relief from the heat, however it will still remain very humid. It will then turn much less humid this weekend in the wake of a cold front. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. && $$ Staarmann
056 WWUS71 KPHI 111902 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 302 PM EDT Thu Jun 11 2026 DEZ001-NJZ015-017>019-PAZ070-071-102-104-106-120915- /O.CON.KPHI.HT.Y.0002.000000T0000Z-260613T0000Z/ New Castle-Mercer-Gloucester-Camden-Northwestern Burlington- Delaware-Philadelphia-Eastern Chester-Eastern Montgomery-Lower Bucks- Including the cities of Media, Kennett Square, Lansdale, West Chester, Mount Holly, Norristown, Cherry Hill, Trenton, Doylestown, Moorestown, Camden, Wilmington, Philadelphia, Glassboro, and Morrisville 302 PM EDT Thu Jun 11 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT FRIDAY... * WHAT...Heat index values up to 103 degrees expected. * WHERE...In Delaware, New Castle County. In New Jersey, Mercer, Camden, Gloucester, and Northwestern Burlington Counties. In Pennsylvania, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, and Philadelphia Counties. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Some showers and thunderstorms late Friday afternoon will provide some local relief from the heat, however it will still remain very humid. It will then turn much less humid this weekend in the wake of a cold front. 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. If you do not have air conditioning in your home or lack shelter, you can call 211, or visit your county or state health department website for assistance locating appropriate shelter from the heat. && $$ NJZ001-007>010-012-013-020-027-120915- /O.CON.KPHI.HT.Y.0002.000000T0000Z-260613T0000Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-Ocean-Southeastern Burlington- Including the cities of Washington, Jackson, New Brunswick, Wharton State Forest, Newton, Freehold, Flemington, Morristown, and Somerville 302 PM EDT Thu Jun 11 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT FRIDAY... * WHAT...Heat index values up to 102 degrees expected. * WHERE...Western Monmouth, Middlesex, Morris, Somerset, Sussex, Warren, Hunterdon, Ocean, and Southeastern Burlington Counties. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Some showers and thunderstorms late Friday afternoon will provide some local relief from the heat, however it will still remain very humid. It will then turn much less humid this weekend in the wake of a cold front. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. && $$ NJZ014-120915- /O.CON.KPHI.HT.Y.0002.000000T0000Z-260613T0000Z/ Eastern Monmouth- Including the cities of Sandy Hook 302 PM EDT Thu Jun 11 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT FRIDAY... * WHAT...Heat index values up to 103 degrees expected. * WHERE...Eastern Monmouth County. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Some showers and thunderstorms late Friday afternoon will provide some local relief from the heat, however it will still remain very humid. It will then turn much less humid this weekend in the wake of a cold front. 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. && $$ PAZ060>062-101-103-105-120915- /O.CON.KPHI.HT.Y.0002.000000T0000Z-260613T0000Z/ Berks-Lehigh-Northampton-Western Chester-Western Montgomery-Upper Bucks- Including the cities of Easton, Allentown, Collegeville, Oxford, Bethlehem, Perkasie, Honey Brook, Chalfont, Reading, and Pottstown 302 PM EDT Thu Jun 11 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT FRIDAY... * WHAT...Heat index values up to 101 degrees expected. * WHERE...Berks, Lehigh, Northampton, Upper Bucks, Western Chester, and Western Montgomery Counties. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Some showers and thunderstorms late Friday afternoon will provide some local relief from the heat, however it will still remain very humid. It will then turn much less humid this weekend in the wake of a cold front. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. && $$ Guzzo
977 WWUS71 KPHI 120759 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 359 AM EDT Fri Jun 12 2026 DEZ001-NJZ015-017>019-PAZ070-071-102-104-106-122100- /O.CON.KPHI.HT.Y.0002.000000T0000Z-260613T0000Z/ New Castle-Mercer-Gloucester-Camden-Northwestern Burlington- Delaware-Philadelphia-Eastern Chester-Eastern Montgomery-Lower Bucks- Including the cities of Cherry Hill, Camden, Doylestown, Trenton, West Chester, Glassboro, Moorestown, Mount Holly, Morrisville, Norristown, Philadelphia, Media, Wilmington, Lansdale, and Kennett Square 359 AM EDT Fri Jun 12 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 103 degrees expected. * WHERE...In Delaware, New Castle County. In New Jersey, Mercer, Camden, Gloucester, and Northwestern Burlington Counties. In Pennsylvania, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, and Philadelphia Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Conditions will turn much less humid this weekend in the wake of a cold front tonight, however high temperatures will remain near 90 degrees. 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. If you do not have air conditioning in your home or lack shelter, you can call 211, or visit your county or state health department website for assistance locating appropriate shelter from the heat. && $$ NJZ001-007>010-PAZ060>062-101-103-105-122100- /O.CON.KPHI.HT.Y.0002.000000T0000Z-260613T0000Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Berks-Lehigh-Northampton- Western Chester-Western Montgomery-Upper Bucks- Including the cities of Newton, Flemington, Washington, Somerville, Easton, Chalfont, Perkasie, Oxford, Collegeville, Pottstown, Morristown, Reading, Allentown, Honey Brook, and Bethlehem 359 AM EDT Fri Jun 12 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 101 degrees expected. * WHERE...Portions of northern and northwest New Jersey and east central and southeast Pennsylvania. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Conditions will turn much less humid this weekend in the wake of a cold front tonight, however high temperatures will remain in the mid 80s to near 90 degrees. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. && $$ NJZ012-013-020-027-122100- /O.CON.KPHI.HT.Y.0002.000000T0000Z-260613T0000Z/ Middlesex-Western Monmouth-Ocean-Southeastern Burlington- Including the cities of New Brunswick, Wharton State Forest, Jackson, and Freehold 359 AM EDT Fri Jun 12 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 104 degrees expected. * WHERE...Western Monmouth, Middlesex, Ocean, and Southeastern Burlington Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Conditions will turn much less humid this weekend in the wake of a cold front tonight, however high temperatures will remain in the upper 80s to near 90 degrees. 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. && $$ NJZ014-122100- /O.CON.KPHI.HT.Y.0002.000000T0000Z-260613T0000Z/ Eastern Monmouth- Including the cities of Sandy Hook 359 AM EDT Fri Jun 12 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 103 degrees expected. * WHERE...Eastern Monmouth County. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Conditions will turn much less humid this weekend in the wake of a cold front tonight, however high temperatures will remain in the mid 80s to near 90 degrees. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. && $$ Staarmann
496 WWUS71 KPHI 121843 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 243 PM EDT Fri Jun 12 2026 DEZ001-NJZ015-017>019-PAZ070-071-102-104-106-130000- /O.CON.KPHI.HT.Y.0002.000000T0000Z-260613T0000Z/ New Castle-Mercer-Gloucester-Camden-Northwestern Burlington- Delaware-Philadelphia-Eastern Chester-Eastern Montgomery-Lower Bucks- Including the cities of Wilmington, Cherry Hill, Kennett Square, Lansdale, Morrisville, West Chester, Mount Holly, Camden, Media, Trenton, Doylestown, Philadelphia, Norristown, Glassboro, and Moorestown 243 PM EDT Fri Jun 12 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 103 degrees expected. * WHERE...In Delaware, New Castle County. In New Jersey, Mercer, Camden, Gloucester, and Northwestern Burlington Counties. In Pennsylvania, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, and Philadelphia Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Conditions will turn much less humid this weekend in the wake of a cold front tonight, however high temperatures will remain near 90 degrees. 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. If you do not have air conditioning in your home or lack shelter, you can call 211, or visit your county or state health department website for assistance locating appropriate shelter from the heat. && $$ NJZ001-007>010-PAZ060>062-101-103-105-130000- /O.CON.KPHI.HT.Y.0002.000000T0000Z-260613T0000Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Berks-Lehigh-Northampton- Western Chester-Western Montgomery-Upper Bucks- Including the cities of Morristown, Flemington, Easton, Honey Brook, Bethlehem, Washington, Collegeville, Pottstown, Newton, Reading, Somerville, Perkasie, Chalfont, Allentown, and Oxford 243 PM EDT Fri Jun 12 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 101 degrees expected. * WHERE...Portions of northern and northwest New Jersey and east central and southeast Pennsylvania. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Conditions will turn much less humid this weekend in the wake of a cold front tonight, however high temperatures will remain in the mid 80s to near 90 degrees. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. && $$ NJZ012-013-020-027-130000- /O.CON.KPHI.HT.Y.0002.000000T0000Z-260613T0000Z/ Middlesex-Western Monmouth-Ocean-Southeastern Burlington- Including the cities of Wharton State Forest, Freehold, Jackson, and New Brunswick 243 PM EDT Fri Jun 12 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 102 degrees expected. * WHERE...Western Monmouth, Middlesex, Ocean, and Southeastern Burlington Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Conditions will turn much less humid this weekend in the wake of a cold front tonight, however high temperatures will remain in the upper 80s to near 90 degrees. 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. && $$ NJZ014-130000- /O.CON.KPHI.HT.Y.0002.000000T0000Z-260613T0000Z/ Eastern Monmouth- Including the cities of Sandy Hook 243 PM EDT Fri Jun 12 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 103 degrees expected. * WHERE...Eastern Monmouth County. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Conditions will turn much less humid this weekend in the wake of a cold front tonight, however high temperatures will remain in the mid 80s to near 90 degrees. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. && $$ DeSilva
737 WWUS71 KPHI 122331 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 731 PM EDT Fri Jun 12 2026 DEZ001-NJZ001-007>010-012>015-017>020-027-PAZ060>062-070-071-101>106- 130045- /O.EXP.KPHI.HT.Y.0002.000000T0000Z-260613T0000Z/ New Castle-Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex- Western Monmouth-Eastern Monmouth-Mercer-Gloucester-Camden- Northwestern Burlington-Ocean-Southeastern Burlington-Berks- Lehigh-Northampton-Delaware-Philadelphia-Western Chester-Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Media, Freehold, Doylestown, Easton, Chalfont, Wharton State Forest, Wilmington, West Chester, Sandy Hook, Bethlehem, Honey Brook, Philadelphia, Flemington, Washington, Moorestown, Morrisville, Jackson, Kennett Square, Cherry Hill, Mount Holly, Collegeville, Somerville, Perkasie, Trenton, Pottstown, Norristown, Glassboro, Oxford, Reading, Lansdale, Camden, Allentown, Morristown, New Brunswick, and Newton 731 PM EDT Fri Jun 12 2026 ...HEAT ADVISORY WILL EXPIRE AT 8 PM EDT THIS EVENING... Temperatures are falling. $$ RCM
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 Jun 9, 7:26 PM EDT, 6 hours 58 minutes earlier. Its key messages:
- 1. Dry conditions expected through much of tonight, however a few isolated showers or storms may arrive by around dawn Wednesday. 2. Dangerous heat is likely on Thursday and Friday. 3. There are multiple chances for thunderstorms Wednesday through Friday. The weekend has trended drier.
Area forecast discussion, Jun 9, 7:26 PM EDT, 6 hours 58 minutes before
Area Forecast Discussion National Weather Service Mount Holly NJ 726 PM EDT Tue Jun 9 2026 .WHAT HAS CHANGED... Aviation section updated for the 00Z TAFs. && .KEY MESSAGES... 1. Dry conditions expected through much of tonight, however a few isolated showers or storms may arrive by around dawn Wednesday. 2. Dangerous heat is likely on Thursday and Friday. 3. There are multiple chances for thunderstorms Wednesday through Friday. The weekend has trended drier. && .DISCUSSION... KEY MESSAGE 1...Dry conditions expected through much of tonight, however a few isolated showers or storms may arrive by around dawn Wednesday. Broad upper ridging will build through tonight. At the surface, high pressure is sliding offshore, beginning a transition to a warm advection regime which will ramp up late tonight as a warm front lifts north. A mid level shortwave trough associated with upstream convection will approach the area by dawn Wednesday. Following a warmer afternoon, lows tonight will be upward of 10-15 degrees warmer than this morning was, mainly in the mid 50s to mid 60s under increasing cloud cover. We'll have to keep an eye on the remnant convection approaching from upstream overnight. Current indications remain that instability will weaken considerably toward the east as the remnant activity moves in overnight into our area. This will likely result in some isolated decaying showers and embedded rumbles of thunder moving in around dawn or so across the western half of the forecast area. KEY MESSAGE 2...Dangerous heat is likely on Thursday and Friday. In general, mid-level ridging is expected to build into the region during the middle and latter part of the week. However, guidance has been trending southward with placement of an upper-low over Canada and associated troughing over the CONUS, and therefore featuring a slightly weaker ridge axis through our region. At the surface, the region will largely be under the influence of high pressure centered over portions of the Southeast. Despite this, dangerous heat is still expected across the area on Thursday and Friday. Temperatures on both days look to climb into the low to mid 90s across most of the area. With dewpoints generally in the low 70s, heat indices are expected to range between 95 to 104 degrees across the majority of the area, outside of the Poconos. The greatest threat for heat indicies over 100 will be found across southeast PA, southern NJ and the Delmarva. This level of heat and humidity can become dangerous quickly for sensitive individuals and those outdoors for extended periods of time. Heat headlines will likely be necessary during this time period to cover this threat. A cold front is forecast to move through the region late Friday into Saturday, which will is expected to knock temperatures and dewpoints down several degrees. Though it will still be hot with highs upper 80s to low 90s over the weekend, dewpoints will return to more comfortable levels, minimizing the threat for additional heat headlines. KEY MESSAGE 3...There are multiple chances for thunderstorms Wednesday through Friday, some which may be severe. The weekend has trended drier. The pattern in place will become increasingly conducive for precipitation chances across the region beginning on Wednesday. Much of this activity looks to be in the form of diurnally driven convection, though some guidance is beginning to indicate a few better opportunities, especially on Friday. The first opportunity comes on Wednesday, with a weak shortwave and surface trough moving through the region. Given marginal instability and shear around the region, the Storm Prediction Center now has our entire forecast area in a MARGINAL Risk (Level 1/5) for severe weather. As of right now, PoPs are around 40-60% areawide. The next opportunity comes on Thursday, however large scale forcing and shear are expected to remain weak. However, hot temperatures and high dewpoints will likely trigger at least some diurnally driven convection, so the Storm Prediction Center has the entire region in a MARGINAL risk once again. PoPs are generally in the 30-60% range. On Friday, the region is expected to begin feeling the influence of the upper trough to the west of the region, in addition to a cold front that will be approaching from the west. Scattered showers and storms may focus near and ahead of this boundary, and with strong destabilization and slightly better wind fields aloft, there is concern that some severe threat could materialize. This will need to be monitored in the coming days as the SPC now has areas northwest of the I-95 corridor outlooked in a 15% chance of severe weather area. Guidance has trended considerably drier for much of the weekend in wake of the cold front, so it now appears that much of the weekend will be dry. However, another front may approach towards the end of the weekend and into early next week, with more chances of showers and storms returning next week. && .AVIATION /00Z WEDNESDAY THROUGH SUNDAY/... The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas. Tonight...Generally a VFR forecast. A few SHRA may develop after 06Z, but restrictions will be minimal, generally MVFR, and confidence is low that any given SHRA will pass over any given terminal. Will carry VCSH for all but KMIV/KACY. S to SW winds 5 to 10 kt, diminishing to around 5 kt. Low confidence on timing and restrictions with any SHRA. Wednesday...VFR initially. MVFR CIGs develop from west to east starting right after 12Z for KRDG/KABE, and MVFR CIGs spread to KTTN/KPNE/KPHL/KILG. KMIV/KACY CIGs should remain VFR outside of any SHRA. One wave of SHRA may impact KRDG/KABE/KTTN/KPNE/KPHL and KILG in the morning, and will carry PROB30 groups for those terminals for potential SHRA. A round of TSRA may then impact the terminals in the afternoon, and will PROB30 groups for that. S to SW winds 5 to 10 kt in the morning, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Low confidence on timing and restrictions resulting from any SHRA and TSRA. Outlook... Wednesday night through Friday night...Prevailing VFR expected through the period. Brief periods of sub-VFR conditions are possible, with isolated to scattered showers and thunderstorms during the afternoon and evening hours. Saturday through Sunday...VFR. No significant weather expected. && .MARINE... No marine hazards expected through Wednesday. Southerly winds increasing to 10-15 kts with gusts up to 20 kts and seas 2-3 feet. May try to touch SCA gusts on the waters late Wednesday, but confidence is low at this time. Outlook... Wednesday night...SCA conditions possible due to wind gusts up to 25 kt and seas around 3-5 feet. Thursday through Sunday...No marine headlines anticipated. Winds will generally remain between 5-15 kt through Saturday, with gusts up to 20 kt possible on Sunday. Seas generally around 2-3 feet. Isolated to scattered showers and thunderstorms possible on Thursday and Friday. Fair weather expected for Saturday and Sunday. Rip Currents... For Wednesday, southerly winds increase to 10 to 20 mph with gusts up to 25 mph, especially in the afternoon. Breaking waves will vary between 2 to 3 feet. While there will be a light easterly swell in the morning, a more dominant southerly swell around 7 to 8 seconds should propagate northward in the afternoon. Given these conditions, have opted to go with a MODERATE risk for the development of dangerous rip currents for all beaches. For Thursday, southwesterly winds diminish to around 10 to 15 mph. Breaking waves around 1 to 2 feet with a southerly swell around 6 to 7 seconds. Given the lighter conditions, have opted to go with a LOW risk for the development of dangerous rip currents for all beaches. Ocean water temperatures are gradually increasing, but remain mostly in the 60s. For specific beach forecasts, visit weather.gov/beach/phi && .PHI WATCHES/WARNINGS/ADVISORIES... PA...None. NJ...None. DE...None. MD...None. MARINE...None. && DISCUSSION...DeSilva/RCM/Staarmann AVIATION...DeSilva/MPS/RCM MARINE...DeSilva/RCM
Hazardous weather outlook, Jun 9, 5:14 AM EDT, 21 hours 10 minutes before
Hazardous Weather Outlook National Weather Service Mount Holly NJ 514 AM EDT Tue Jun 9 2026 MDZ012-015-019-020-100915- Kent MD-Queen Annes-Talbot-Caroline- 514 AM EDT Tue Jun 9 2026 This Hazardous Weather Outlook is for northeast Maryland. .DAY ONE...Today and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. There is a marginal risk (level 1 our of 5) of severe thunderstorms on Wednesday and Thursday. Hot and humid conditions are expected Thursday and Friday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. Staarmann
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 10, 3:52 AM EDT | Small Craft Advisory | PHI | 20 hr | |
| Jun 10, 5:26 PM EDT | Special Marine Warning | PHI | 49 min | |
| Jun 10, 6:11 PM EDT | Special Marine Warning | PHI | 64 min |
Nearby
Heat Advisories in New Jersey, 2026Heat Advisories in Pennsylvania, 2026Heat Advisories in Delaware, 2026Every heat advisory in 2026
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.