Alert archive / New Jersey / Heat Advisories in 2026
Heat Advisory 10, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this heat advisory at Sep 2, 2026, 3:53 AM EDT for 4 states. It took effect at Sep 3, 2026, 11:00 AM EDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Sep 2, 2026, 3:53 AM EDT (07:53 UTC)
- In effect from
- Sep 3, 2026, 11:00 AM EDT
- Expired
- Sep 3, 2026, 7:26 PM EDT
- In force
- 8 hr
- Issued by
- NWS Philadelphia/Mount Holly
Counties Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Mercer County, NJ, Monmouth County, NJ, Ocean County, NJ, Berks County, PA, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 84 km from the middle of the area, began a volume at 07:56 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 7.9 hours before the alert went out and 196 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
- 1278 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 1771 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 79 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 4.1
The text
As transmitted.
051 WWUS71 KPHI 020753 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 353 AM EDT Wed Sep 2 2026 DEZ001-NJZ017>019-PAZ070-071-104-106-022100- /O.NEW.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/ New Castle-Gloucester-Camden-Northwestern Burlington-Delaware- Philadelphia-Eastern Montgomery-Lower Bucks- Including the cities of Mount Holly, Lansdale, Moorestown, Doylestown, Wilmington, Camden, Cherry Hill, Morrisville, Philadelphia, Glassboro, Norristown, and Media 353 AM EDT Wed Sep 2 2026 ...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY... * WHAT...Heat index values up to 102 degrees expected. * WHERE...In Delaware, New Castle County. In New Jersey, Camden, Gloucester, and Northwestern Burlington Counties. In Pennsylvania, Delaware, Eastern Montgomery, Lower Bucks, and Philadelphia Counties. * 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. 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. && $$ NJZ013>015-020-027-PAZ060-101>103-022100- /O.NEW.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/ Western Monmouth-Eastern Monmouth-Mercer-Ocean-Southeastern Burlington-Berks-Western Chester-Eastern Chester-Western Montgomery- Including the cities of Freehold, West Chester, Reading, Oxford, Wharton State Forest, Honey Brook, Pottstown, Sandy Hook, Jackson, Trenton, Kennett Square, and Collegeville 353 AM EDT Wed Sep 2 2026 ...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY... * WHAT...Heat index values up to 100 degrees expected. * WHERE...In New Jersey, Eastern Monmouth, Mercer, Western Monmouth, Ocean, and Southeastern Burlington Counties. In Pennsylvania, Berks, Eastern Chester, Western Chester, and Western Montgomery Counties. * WHEN...From 11 AM to 8 PM EDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ Staarmann
4 follow-up statements
929 WWUS71 KPHI 021810 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 210 PM EDT Wed Sep 2 2026 DEZ002-003-MDZ012-015-019-020-030900- /O.EXA.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/ Kent-Inland Sussex-Kent MD-Queen Annes-Talbot-Caroline- Including the cities of Centreville, Georgetown, Chestertown, Easton, Dover, and Denton 210 PM EDT Wed Sep 2 2026 ...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY... * WHAT...Heat index values up to 105 degrees expected. * WHERE...In Delaware, Kent and Inland Sussex Counties. In Maryland, Caroline, Kent MD, Queen Annes, and Talbot Counties. * 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. 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. && $$ DEZ001-NJZ017>019-PAZ070-071-104-106-030900- /O.CON.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/ New Castle-Gloucester-Camden-Northwestern Burlington-Delaware- Philadelphia-Eastern Montgomery-Lower Bucks- Including the cities of Wilmington, Philadelphia, Morrisville, Doylestown, Moorestown, Camden, Lansdale, Media, Glassboro, Cherry Hill, Mount Holly, and Norristown 210 PM EDT Wed Sep 2 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY... * WHAT...Heat index values up to 101 degrees expected. * WHERE...In Delaware, New Castle County. In New Jersey, Camden, Gloucester, and Northwestern Burlington Counties. In Pennsylvania, Delaware, Eastern Montgomery, Lower Bucks, and Philadelphia Counties. * WHEN...From 11 AM to 8 PM EDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ013>015-020-027-PAZ060-101>103-030900- /O.CON.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/ Western Monmouth-Eastern Monmouth-Mercer-Ocean-Southeastern Burlington-Berks-Western Chester-Eastern Chester-Western Montgomery- Including the cities of Honey Brook, Oxford, Pottstown, Freehold, Sandy Hook, Trenton, West Chester, Reading, Jackson, Wharton State Forest, Collegeville, and Kennett Square 210 PM EDT Wed Sep 2 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY... * WHAT...Heat index values up to 100 degrees expected. * WHERE...In New Jersey, Eastern Monmouth, Mercer, Western Monmouth, Ocean, and Southeastern Burlington Counties. In Pennsylvania, Berks, Eastern Chester, Western Chester, and Western Montgomery Counties. * 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. 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. && $$ Guzzo
752 WWUS71 KPHI 030526 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 126 AM EDT Thu Sep 3 2026 DEZ001-NJZ017>019-PAZ070-071-104-106-032000- /O.CON.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/ New Castle-Gloucester-Camden-Northwestern Burlington-Delaware- Philadelphia-Eastern Montgomery-Lower Bucks- Including the cities of Camden, Cherry Hill, Moorestown, Doylestown, Lansdale, Media, Mount Holly, Morrisville, Philadelphia, Norristown, Glassboro, and Wilmington 126 AM EDT Thu Sep 3 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 102 expected. * WHERE...In Delaware, New Castle County. In New Jersey, Camden, Gloucester, and Northwestern Burlington Counties. In Pennsylvania, Delaware, Eastern Montgomery, Lower Bucks, and Philadelphia Counties. * WHEN...From 11 AM this morning to 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ DEZ002-003-MDZ012-015-019-020-032000- /O.CON.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/ Kent-Inland Sussex-Kent MD-Queen Annes-Talbot-Caroline- Including the cities of Georgetown, Dover, Denton, Easton, Chestertown, and Centreville 126 AM EDT Thu Sep 3 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 106 expected. * WHERE...In Delaware, Kent and Inland Sussex Counties. In Maryland, Caroline, Kent MD, Queen Annes, and Talbot Counties. * WHEN...From 11 AM this morning to 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. && $$ NJZ013>015-020-027-PAZ060-101>103-032000- /O.CON.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/ Western Monmouth-Eastern Monmouth-Mercer-Ocean-Southeastern Burlington-Berks-Western Chester-Eastern Chester-Western Montgomery- Including the cities of Reading, Freehold, Sandy Hook, Jackson, Kennett Square, Trenton, Honey Brook, Collegeville, Wharton State Forest, West Chester, Pottstown, and Oxford 126 AM EDT Thu Sep 3 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 100 degrees expected. * WHERE...In New Jersey, Eastern Monmouth, Mercer, Western Monmouth, Ocean, and Southeastern Burlington Counties. In Pennsylvania, Berks, Eastern Chester, Western Chester, and Western Montgomery Counties. * WHEN...From 11 AM this morning to 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
587 WWUS71 KPHI 031803 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 203 PM EDT Thu Sep 3 2026 DEZ001-NJZ017>019-PAZ070-071-104-106-040000- /O.CON.KPHI.HT.Y.0010.000000T0000Z-260904T0000Z/ New Castle-Gloucester-Camden-Northwestern Burlington-Delaware- Philadelphia-Eastern Montgomery-Lower Bucks- Including the cities of Philadelphia, Glassboro, Doylestown, Camden, Lansdale, Media, Mount Holly, Cherry Hill, Wilmington, Morrisville, Moorestown, and Norristown 203 PM EDT Thu Sep 3 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 102. * WHERE...In Delaware, New Castle County. In New Jersey, Camden, Gloucester, and Northwestern Burlington Counties. In Pennsylvania, Delaware, Eastern Montgomery, Lower Bucks, and Philadelphia 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. && $$ DEZ002-003-MDZ012-015-019-020-040000- /O.CON.KPHI.HT.Y.0010.000000T0000Z-260904T0000Z/ Kent-Inland Sussex-Kent MD-Queen Annes-Talbot-Caroline- Including the cities of Dover, Georgetown, Denton, Chestertown, Centreville, and Easton 203 PM EDT Thu Sep 3 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 106. * WHERE...In Delaware, Kent and Inland Sussex Counties. In Maryland, Caroline, Kent MD, Queen Annes, and Talbot Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ013>015-020-027-PAZ060-101>103-040000- /O.CON.KPHI.HT.Y.0010.000000T0000Z-260904T0000Z/ Western Monmouth-Eastern Monmouth-Mercer-Ocean-Southeastern Burlington-Berks-Western Chester-Eastern Chester-Western Montgomery- Including the cities of Wharton State Forest, Kennett Square, Pottstown, Honey Brook, Trenton, West Chester, Jackson, Sandy Hook, Collegeville, Oxford, Reading, and Freehold 203 PM EDT Thu Sep 3 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 99. * WHERE...In New Jersey, Eastern Monmouth, Mercer, Western Monmouth, Ocean, and Southeastern Burlington Counties. In Pennsylvania, Berks, Eastern Chester, Western Chester, and Western Montgomery 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. && $$
084 WWUS71 KPHI 032326 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 726 PM EDT Thu Sep 3 2026 DEZ001>003-MDZ012-015-019-020-NJZ013>015-017>020-027-PAZ060-070-071- 101>104-106-040030- /O.CAN.KPHI.HT.Y.0010.000000T0000Z-260904T0000Z/ New Castle-Kent-Inland Sussex-Kent MD-Queen Annes-Talbot-Caroline- Western Monmouth-Eastern Monmouth-Mercer-Gloucester-Camden- Northwestern Burlington-Ocean-Southeastern Burlington-Berks- Delaware-Philadelphia-Western Chester-Eastern Chester-Western Montgomery-Eastern Montgomery-Lower Bucks- Including the cities of Doylestown, Centreville, Camden, Mount Holly, Trenton, Media, Lansdale, Wharton State Forest, Jackson, Easton, Glassboro, Denton, Georgetown, Cherry Hill, Oxford, Chestertown, Honey Brook, Kennett Square, Norristown, Morrisville, Sandy Hook, Collegeville, West Chester, Moorestown, Wilmington, Freehold, Dover, Philadelphia, Pottstown, and Reading 726 PM EDT Thu Sep 3 2026 ...HEAT ADVISORY IS CANCELLED... Heat index values are below 100 degrees. $$ MPS
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 Sep 2, 1:40 AM EDT, 2 hours 13 minutes earlier. Its key messages:
- 1. Today into tonight, a shortwave trough could spark another round of showers and storms, but it will be working against a relatively stable boundary layer. 2. Hot and humid conditions are forecast across the region on Thursday. 3. Unsettled conditions will continue on Thursday with the potential for severe thunderstorms. Scattered thunderstorms are again possible on Friday, mainly from Philadelphia south. 4. The Labor Day Weekend will feature mostly dry weather with at or below normal temperatures and lower humidity.
Area forecast discussion, Sep 2, 1:40 AM EDT, 2 hours 13 minutes before
Area Forecast Discussion National Weather Service Mount Holly NJ 140 AM EDT Wed Sep 2 2026 .WHAT HAS CHANGED... Aviation section updated for the 06Z TAF issuance. For today into tonight, confidence in storm coverage and intensity remains low. The chance for showers and thunderstorms shifted a bit north on Friday. Friday afternoon high temperatures also inched up a few degrees. && .KEY MESSAGES... 1. Today into tonight, a shortwave trough could spark another round of showers and storms, but it will be working against a relatively stable boundary layer. 2. Hot and humid conditions are forecast across the region on Thursday. 3. Unsettled conditions will continue on Thursday with the potential for severe thunderstorms. Scattered thunderstorms are again possible on Friday, mainly from Philadelphia south. 4. The Labor Day Weekend will feature mostly dry weather with at or below normal temperatures and lower humidity. && .DISCUSSION... KEY MESSAGE 1...Today into tonight, a shortwave trough could spark another round of showers and storms, but it will be working against a relatively stable boundary layer. A cold front currently situated across central portions of the region continues to sink southward, and should continue to make southwestward progress through this morning. This will leave our region in the relatively cooler and more stable air mass north of the front. The net result is that our region should be in northeasterly flow, and relatively cloudy conditions for much of the day. As a result, surface based instability is expected to be very limited, with mostly elevated instability present. Consequently, the risk for severe storms is still quite conditional and uncertain. Given how sharp of a mid level short wave trough is approaching, there will be ample forcing, but it is a question of if the elevated instability will be enough to sustain storms in our region. With that said, some CAMs do feature storms moving into parts of the area late this afternoon and into tonight. Confidence in details is relatively low, but should the region experience more destabilization than is currently anticipated, storms will be capable of damaging winds, some hail, and perhaps an isolated tornado. KEY MESSAGE 2...Hot and humid conditions are forecast across the region on Thursday. After a cool down on Wednesday for most neighborhoods (5 to 10 degrees lower - less across Delmarva), hot and humid conditions are once again expected across the region on Thursday as the frontal boundary lifts north. With the front to the north, high temperatures are forecast to climb into the upper 80s to mid 90s for many areas (around 80 or low 80s far N and W). These temperatures combined with dewpoints in the low to mid 70s will again result in heat indices well into the 90s to low 100s south of I-78, perhaps even as high as 105 degrees for Delmarva. Another Heat Advisory may be needed for portions of the area on Thursday if this trend continues. KEY MESSAGE 3...Unsettled conditions will continue on Thursday with the potential for severe thunderstorms. Scattered thunderstorms are again possible on Friday, mainly from Philadelphia south. Another round of severe thunderstorms are possible on Thursday. Friday could also experience a few severe storms across Delmarva, depending on how quickly the frontal boundary pushes south. SPC has a Slight Risk (level 2 out of 5) for severe thunderstorms on Thursday from about Wilmington to Wildwood NJ southward and a Marginal Risk (level 1) to the north of this. The northwest flow pattern will remain in place on Thursday and will continue to be supportive of all severe threats, including damaging winds, large hail, and a few tornadoes, depending on how all the mesoscale details pan out. The threat for flash flooding is typically lower with these patterns, but not zero. Training can still occur and a single locale could have multiple days with heavy rainfall. Friday's SPC's 15% probabilities for severe thunderstorms have shifted just south of our Delmarva zones, though there is still some uncertainty with this. Our latest forecast has about a 30-40% chance of showers and thunderstorms south of about Philadelphia. KEY MESSAGE 4...The Labor Day Weekend will feature mostly dry weather with at or below normal temperatures and lower humidity. By Saturday, current model consensus indicates the frontal boundary will be pushing south of our region with Canadian high pressure building across the Northeast and Mid-Atlantic. This will largely end any shower and thunderstorm potential. Thus, Labor Day Weekend is still shaping up to feature nice weather, with temperatures trending at or slightly below normal and lower humidity. The only road bump at the moment, could be a cold front that approaches the forecast area very late on Monday. && .AVIATION /06Z WEDNESDAY THROUGH SUNDAY/... Through 12Z...MVFR and IFR ceilings are expected to rapidly spread across the terminals through 09Z. Winds may briefly be light and variable for a time before settling out of the northeast around 5 kts. Some patchy BR is possible at times. Low confidence. Today...MVFR ceilings may remain through much of the day. There is a 20 to 40% chance for showers and storms through the day time that could also result in restrictions, however, there is considerable uncertainty to the extent of storm development tomorrow. Winds through much of the morning are expected to be out of the northeast at 5-10 kts, before shifting more east- southeasterly by 18-21Z. Low confidence. Tonight...MVFR or IFR ceilings. Scattered showers and storms are possible, but there is low confidence in coverage and intensity. Visibility restrictions are likely in any stronger storms. East- southeast winds around 5 kts. Low confidence. Outlook... Thursday and Friday...Sub-VFR conditions are possible in showers and thunderstorms each day (20-40% chance), mainly during the afternoon to evening hours. Saturday and Sunday...Primarily VFR conditions expected. && .MARINE... Winds and seas are expected to stay below Small Craft Advisory conditions. However, gusty and erratic winds are possible in the vicinity of any storms, particularly tonight. Outlook... Thursday through Sunday...Sub-SCA conditions are expected through the period. There is a chance (40 to 50%) for thunderstorms Thursday, mainly in the afternoon and evening hours. For Friday, the chance of thunderstorms (30 to 40%) shifts south a bit, basically extending from Manasquan Inlet, NJ down to Fenwick Island, DE. Rip Currents... On Wednesday, northeast flow will range from 10 to 15 mph with gusts up to 20 mph along the New Jersey coast. There will be southeast swells with a period around 10 seconds and breaking waves of 2 to 3 feet. As a result, there is a MODERATE risk for the development of dangerous and life threatening rip currents for the Jersey Shore along Monmouth, Ocean, and Atlantic counties, and a LOW risk for the development of dangerous and life threatening rip currents for the Jersey Shore in Cape May county and Delaware Beaches. For Thursday, winds become southwest at 10 to 15 mph with gusts up to 20 mph along the Jersey Shore. Breaking waves will range from 1 to 3 feet with light easterly swells with a period around 6 seconds. As a result, there is a MODERATE risk for the development of dangerous and life threatening rip currents for the Jersey Shore along Monmouth, Ocean, and Atlantic counties, and a LOW risk for the development of dangerous and life threatening rip currents for the Jersey Shore in Cape May county and Delaware Beaches. && .PHI WATCHES/WARNINGS/ADVISORIES... PA...None. NJ...None. DE...None. MD...None. MARINE...None. && DISCUSSION...Cooper/WFO PHI AVIATION...Cooper/WFO PHI MARINE...MPS
Hazardous weather outlook, Sep 1, 5:07 AM EDT, 22 hours 46 minutes before
Hazardous Weather Outlook National Weather Service Mount Holly NJ 507 AM EDT Tue Sep 1 2026 MDZ012-015-019-020-020915- Kent MD-Queen Annes-Talbot-Caroline- 507 AM EDT Tue Sep 1 2026 This Hazardous Weather Outlook is for northeast Maryland. .DAY ONE...Today and tonight. Severe thunderstorms are possible this evening. Heat indicies will be in the low 100s this afternoon. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Severe thunderstorms are possible Wednesday and Thursday. Heat indicies will be in the upper 90s to low 100s Wednesday and Thursday. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. Staarmann
In the hours before
Local storm report, Sep 2, 1:44 AM EDT, 2 hours 9 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
144 AM EDT Wed Sep 2 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0832 PM Tstm Wnd Dmg Newark 39.68N 75.75W
09/01/2026 New Castle DE 911 Call Center
Trees down in Newark. Time estimated from
radar.
&&
StaarmannLocal storm report, Sep 2, 1:55 AM EDT, 1 hour 58 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
155 AM EDT Wed Sep 2 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0835 PM Tstm Wnd Dmg Pennsville 39.65N 75.52W
09/01/2026 Salem NJ 911 Call Center
Multiple reports of trees and wires down
around Pennsville. Time estimated from
radar.
&&
StaarmannLocal storm report, Sep 2, 2:13 AM EDT, 1 hour 40 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
213 AM EDT Wed Sep 2 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0635 PM Tstm Wnd Dmg Mahoning Twp 40.81N 75.75W
09/01/2026 Carbon PA 911 Call Center
Tree down in Mahoning Township. Time
estimated from radar.
&&
StaarmannLocal storm report, Sep 2, 2:16 AM EDT, 1 hour 37 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
216 AM EDT Wed Sep 2 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0640 PM Tstm Wnd Dmg East Penn Twp 40.77N 75.74W
09/01/2026 Carbon PA 911 Call Center
Tree down in East Penn Township. Time
estimated from radar.
&&
StaarmannLocal storm report, Sep 2, 2:27 AM EDT, 1 hour 26 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
227 AM EDT Wed Sep 2 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0903 PM Tstm Wnd Dmg Pitman 39.74N 75.12W
09/01/2026 Gloucester NJ Trained Spotter
Large tree branch down near Pitman. Time
estimated from radar.
&&
StaarmannLocal storm report, Sep 2, 2:44 AM EDT, 1 hour 9 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
244 AM EDT Wed Sep 2 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1009 PM Marine Tstm Wind 1 N Atlantic City 39.38N 74.42W
09/01/2026 M44 MPH Atlantic NJ Other Federal
USGS gauge at the Atlantic City Marina.
&&
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 8:17 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 58 min |
| Sep 1, 8:44 PM EDT | Flash Flood Warning | PHI | New Castle | 3 hr |
| Sep 1, 8:46 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 59 min |
| Sep 1, 9:40 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle, Sussex | 65 min |
| Sep 2, 1:35 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 40 min |
| Sep 2, 2:05 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 40 min |
| Sep 2, 2:38 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 47 min |
| Sep 1, 8:05 PM EDT | Special Marine Warning | PHI | 85 min | |
| Sep 1, 8:08 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 52 min |
| Sep 1, 8:11 PM EDT | Special Marine Warning | PHI | 94 min | |
| Sep 1, 8:26 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Cumberland, Gloucester | 49 min |
| Sep 1, 8:57 PM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester, Salem | 48 min |
| Sep 1, 9:04 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 71 min |
| Sep 1, 9:07 PM EDT | Tornado Warning | PHI | Burlington | 21 min |
| Sep 1, 9:16 PM EDT | Tornado Warning | PHI | Burlington | 12 min |
| Sep 1, 9:19 PM EDT | Flash Flood Warning | PHI | Hunterdon, Mercer, Middlesex | 116 min |
| Sep 1, 9:22 PM EDT | Special Marine Warning | PHI | 68 min | |
| Sep 1, 9:25 PM EDT | Special Marine Warning | PHI | 95 min | |
| Sep 1, 9:26 PM EDT | Flash Flood Warning | PHI | Atlantic, Camden, Gloucester | 115 min |
| Sep 1, 9:33 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Cape May, Ocean | 57 min |
| Sep 1, 9:54 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Cape May, Cumberland | 42 min |
| Sep 1, 10:06 PM EDT | Special Marine Warning | PHI | 84 min | |
| Sep 1, 10:48 PM EDT | Special Marine Warning | PHI | 57 min | |
| Sep 1, 11:12 PM EDT | Special Marine Warning | PHI | 63 min | |
| Sep 2, 12:40 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 65 min |
| Sep 2, 1:03 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 57 min |
| Sep 2, 1:43 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 47 min |
Nearby
Heat Advisories in New Jersey, 2026Heat Advisories in Pennsylvania, 2026Heat Advisories in Maryland, 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.