Alert archive / Pennsylvania / Excessive Heat Watches in 2021
Excessive Heat Watch 2, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this excessive heat watch at Aug 11, 2021, 2:56 PM EDT for 6 counties in Pennsylvania; Hunterdon County, Morris County, Warren County, New Jersey. It took effect at Aug 12, 2021, 8:00 PM EDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Aug 11, 2021, 2:56 PM EDT (18:56 UTC)
- In effect from
- Aug 12, 2021, 8:00 PM EDT
- Expired
- Aug 12, 2021, 3:07 AM EDT
- In force
- Issued by
- NWS Philadelphia/Mount Holly
Counties Hunterdon County, NJ, Morris County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 97 km from the middle of the area, began a volume at 18:58 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 6.9 hours before the alert went out and 207 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
- 977 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 711 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
118 WWUS71 KPHI 111856 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 256 PM EDT Wed Aug 11 2021 DEZ001-NJZ015-017>019-PAZ070-071-102-104-106-121000- /O.EXT.KPHI.EH.W.0002.000000T0000Z-210814T0000Z/ New Castle-Mercer-Gloucester-Camden-Northwestern Burlington- Delaware-Philadelphia-Eastern Chester-Eastern Montgomery- Lower Bucks- Including the cities of Wilmington, Trenton, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, Philadelphia, West Chester, Kennett Square, Norristown, Lansdale, Morrisville, and Doylestown 256 PM EDT Wed Aug 11 2021 ...EXCESSIVE HEAT WARNING NOW IN EFFECT UNTIL 8 PM EDT FRIDAY... * WHAT...Dangerously hot conditions with heat index values up to 107. * WHERE...In Pennsylvania, Delaware, Philadelphia, Eastern Montgomery, Lower Bucks and Eastern Chester. In New Jersey, Gloucester, Mercer, Northwestern Burlington and Camden. In Delaware, New Castle. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Overnight low temperatures near 80 will not provide much relief from the heat. 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. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. 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. && $$ NJZ010-012-013-020-027-121000- /O.EXT.KPHI.EH.W.0002.000000T0000Z-210814T0000Z/ Somerset-Middlesex-Western Monmouth-Ocean-Southeastern Burlington- Including the cities of Somerville, New Brunswick, Freehold, Jackson, and Wharton State Forest 256 PM EDT Wed Aug 11 2021 ...EXCESSIVE HEAT WARNING NOW IN EFFECT UNTIL 8 PM EDT FRIDAY... * WHAT...Dangerously hot conditions with heat index values up to 108. * WHERE...Ocean, Western Monmouth, Middlesex, Somerset and Southeastern Burlington. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Overnight low temperatures in the mid to upper 70s will not provide much relief from the heat. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ007>009-PAZ060>062-101-103-105-121000- /O.NEW.KPHI.EH.A.0002.210813T0000Z-210814T0000Z/ /O.CON.KPHI.EH.W.0002.000000T0000Z-210813T0000Z/ Warren-Morris-Hunterdon-Berks-Lehigh-Northampton-Western Chester- Western Montgomery-Upper Bucks- Including the cities of Washington, Morristown, Flemington, Reading, Allentown, Bethlehem, Easton, Honey Brook, Oxford, Collegeville, Pottstown, Chalfont, and Perkasie 256 PM EDT Wed Aug 11 2021 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM EDT THURSDAY... ...EXCESSIVE HEAT WATCH IN EFFECT FROM THURSDAY EVENING THROUGH FRIDAY EVENING... * WHAT...For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 106. For the Excessive Heat Watch, dangerously hot conditions with heat index values up to 105 possible. * WHERE...In New Jersey, Warren, Morris and Hunterdon. In Pennsylvania, Berks, Lehigh, Northampton, Western Chester, Western Montgomery and Upper Bucks. * WHEN...For the Excessive Heat Warning, until 8 PM EDT Thursday. For the Excessive Heat Watch, from Thursday evening through Friday evening. * IMPACTS...Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...The most oppressive heat and humidity should be Thursday, but hot and humid conditions will continue through Friday. Overnight low temperatures in the low 70s will not provide much relief from the heat. 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. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. 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. && $$ DEZ002-003-MDZ012-015-019-020-NJZ016-021>023-121000- /O.EXT.KPHI.HT.Y.0008.000000T0000Z-210814T0000Z/ Kent-Inland Sussex-Kent MD-Queen Annes-Talbot-Caroline-Salem- Cumberland-Atlantic-Cape May- Including the cities of Dover, Georgetown, Chestertown, Centreville, Easton, Denton, Pennsville, Millville, Hammonton, and Cape May Court House 256 PM EDT Wed Aug 11 2021 ...HEAT ADVISORY NOW IN EFFECT UNTIL 8 PM EDT FRIDAY... * WHAT...Heat index values up to 108. * WHERE...In New Jersey, Cape May, Cumberland, Salem and Atlantic. In Maryland, Caroline, Talbot, Kent MD and Queen Annes. In Delaware, Inland Sussex and Kent. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS...Overnight low temperatures in the mid to upper 70s will not provide much relief from the heat. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ014-026-121000- /O.EXT.KPHI.HT.Y.0008.000000T0000Z-210814T0000Z/ Eastern Monmouth-Coastal Ocean- Including the cities of Sandy Hook and Long Beach Island 256 PM EDT Wed Aug 11 2021 ...HEAT ADVISORY NOW IN EFFECT UNTIL 8 PM EDT FRIDAY... * WHAT...Heat index values up to 101. * WHERE...Coastal Ocean and Eastern Monmouth. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS...Overnight low temperatures in the mid to upper 70s will not provide much relief from the heat. 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. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. 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. && $$ NJZ001-PAZ054-055-121000- /O.CON.KPHI.HT.Y.0008.000000T0000Z-210813T0000Z/ Sussex-Carbon-Monroe- Including the cities of Newton, Jim Thorpe, and Stroudsburg 256 PM EDT Wed Aug 11 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THURSDAY... * WHAT...Heat index values up to 104. * WHERE...In New Jersey, Sussex. In Pennsylvania, Carbon and Monroe. * WHEN...Until 8 PM EDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS...Overnight low temperatures in the mid to upper 70s will not provide much relief from the heat. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ MPS
1 follow-up statement
231 WWUS71 KPHI 120707 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 307 AM EDT Thu Aug 12 2021 NJZ007>009-PAZ060>062-101-103-105-122015- /O.CAN.KPHI.EH.A.0002.210813T0000Z-210814T0000Z/ /O.EXT.KPHI.EH.W.0002.000000T0000Z-210814T0000Z/ Warren-Morris-Hunterdon-Berks-Lehigh-Northampton-Western Chester- Western Montgomery-Upper Bucks- Including the cities of Washington, Morristown, Flemington, Reading, Allentown, Bethlehem, Easton, Honey Brook, Oxford, Collegeville, Pottstown, Chalfont, and Perkasie 307 AM EDT Thu Aug 12 2021 ...EXCESSIVE HEAT WARNING NOW IN EFFECT UNTIL 8 PM EDT FRIDAY... ...EXCESSIVE HEAT WATCH IS CANCELLED... * WHAT...Dangerously hot conditions with heat index values up to 106. * WHERE...In New Jersey, Morris, Hunterdon and Warren. In Pennsylvania, Upper Bucks, Western Chester, Western Montgomery, Northampton, Lehigh and Berks. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Overnight low temperatures in the 70s will not provide much relief from the heat. 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. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. 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. && $$ DEZ001-NJZ015-017>019-PAZ070-071-102-104-106-122015- /O.CON.KPHI.EH.W.0002.000000T0000Z-210814T0000Z/ New Castle-Mercer-Gloucester-Camden-Northwestern Burlington- Delaware-Philadelphia-Eastern Chester-Eastern Montgomery- Lower Bucks- Including the cities of Wilmington, Trenton, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, Philadelphia, West Chester, Kennett Square, Norristown, Lansdale, Morrisville, and Doylestown 307 AM EDT Thu Aug 12 2021 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM EDT FRIDAY... * WHAT...Dangerously hot conditions with heat index values up to 107. * WHERE...In Pennsylvania, Delaware, Philadelphia, Eastern Montgomery, Lower Bucks and Eastern Chester. In New Jersey, Gloucester, Mercer, Northwestern Burlington and Camden. In Delaware, New Castle. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Overnight low temperatures near 80 will not provide much relief from the heat. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NJZ010-012-013-020-027-122015- /O.CON.KPHI.EH.W.0002.000000T0000Z-210814T0000Z/ Somerset-Middlesex-Western Monmouth-Ocean-Southeastern Burlington- Including the cities of Somerville, New Brunswick, Freehold, Jackson, and Wharton State Forest 307 AM EDT Thu Aug 12 2021 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM EDT FRIDAY... * WHAT...Dangerously hot conditions with heat index values up to 108. * WHERE...Ocean, Western Monmouth, Middlesex, Somerset and Southeastern Burlington. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Overnight low temperatures in the mid to upper 70s will not provide much relief from the heat. 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. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. 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. && $$ NJZ001-PAZ054-055-122015- /O.CON.KPHI.HT.Y.0008.000000T0000Z-210813T0000Z/ Sussex-Carbon-Monroe- Including the cities of Newton, Jim Thorpe, and Stroudsburg 307 AM EDT Thu Aug 12 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 104. * WHERE...In New Jersey, Sussex. In Pennsylvania, Carbon and Monroe. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS...Overnight low temperatures in the 70s will not provide much relief from the heat. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ DEZ002-003-MDZ012-015-019-020-NJZ016-021>023-122015- /O.CON.KPHI.HT.Y.0008.000000T0000Z-210814T0000Z/ Kent-Inland Sussex-Kent MD-Queen Annes-Talbot-Caroline-Salem- Cumberland-Atlantic-Cape May- Including the cities of Dover, Georgetown, Chestertown, Centreville, Easton, Denton, Pennsville, Millville, Hammonton, and Cape May Court House 307 AM EDT Thu Aug 12 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT FRIDAY... * WHAT...Heat index values up to 107. * WHERE...In New Jersey, Cape May, Cumberland, Salem and Atlantic. In Maryland, Caroline, Talbot, Kent MD and Queen Annes. In Delaware, Inland Sussex and Kent. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS...Overnight low temperatures in the mid to upper 70s will not provide much relief from the heat. 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. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. 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. && $$ NJZ014-026-122015- /O.CON.KPHI.HT.Y.0008.000000T0000Z-210814T0000Z/ Eastern Monmouth-Coastal Ocean- Including the cities of Sandy Hook and Long Beach Island 307 AM EDT Thu Aug 12 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT FRIDAY... * WHAT...Heat index values up to 101. * WHERE...Coastal Ocean and Eastern Monmouth. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS...Overnight low temperatures in the mid to upper 70s will not provide much relief from the heat. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ Fitzsimmons
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 8:02 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 43 min |
| Aug 10, 8:18 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery | 42 min |
| Aug 10, 8:36 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 39 min |
| Aug 10, 8:43 PM EDT | Areal Flood Advisory | PHI | Delaware, Montgomery, Philadelphia | 2 hr |
| Aug 11, 4:46 PM EDT | Special Weather Statement | PHI | Monroe | 44 min |
| Aug 11, 4:58 PM EDT | Special Weather Statement | PHI | Berks | 47 min |
| Aug 11, 5:20 PM EDT | Areal Flood Advisory | PHI | Carbon, Monroe | 57 min |
| Aug 11, 5:48 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 57 min |
| Aug 11, 6:16 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Montgomery | 44 min |
| Aug 11, 6:26 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Delaware, Montgomery | 49 min |
| Aug 11, 6:48 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Montgomery, Northampton | 42 min |
| Aug 11, 6:50 PM EDT | Areal Flood Advisory | PHI | Monroe, Northampton | 3 hr |
| Aug 11, 7:04 PM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 2 more | 2 hr |
| Aug 11, 7:11 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 49 min |
| Aug 10, 8:23 PM EDT | Special Marine Warning | PHI | 79 min | |
| Aug 10, 9:07 PM EDT | Special Weather Statement | PHI | Burlington, Camden, Cumberland | 23 min |
| Aug 11, 5:57 PM EDT | Special Weather Statement | PHI | Sussex | 48 min |
| Aug 11, 6:32 PM EDT | Special Weather Statement | PHI | Morris, Sussex, Warren | 28 min |
| Aug 11, 7:04 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex, Warren | 41 min |
| Aug 11, 7:28 PM EDT | Flash Flood Warning | PHI | Morris, Warren | 3 hr |
| Aug 11, 7:45 PM EDT | Special Weather Statement | PHI | Morris | 45 min |
| Aug 11, 7:52 PM EDT | Special Weather Statement | PHI | Atlantic, Burlington, Camden, Gloucester, Mercer | 53 min |
| Aug 11, 7:57 PM EDT | Special Weather Statement | PHI | Hunterdon, Middlesex, Somerset | 48 min |
Nearby
Excessive Heat Watches in Pennsylvania, 2021Excessive Heat Watches in New Jersey, 2021Every excessive heat watch in 2021
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.