Alert archive / New Jersey / Freeze Watches in 2021
Freeze Watch 3, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this freeze watch at Apr 22, 2021, 8:58 AM EDT for 6 counties in Pennsylvania; 12 counties in New Jersey. It took effect at Apr 23, 2021, 1:00 AM EDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Apr 22, 2021, 8:58 AM EDT (12:58 UTC)
- In effect from
- Apr 23, 2021, 1:00 AM EDT
- Expired
- Apr 22, 2021, 2:31 PM EDT
- In force
- Issued by
- NWS Philadelphia/Mount Holly
Counties Atlantic County, NJ, Burlington County, NJ, Cumberland 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, Lehigh County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 61 km from the middle of the area, began a volume at 13:00 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, 1.0 hours before the alert went out and 185 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
- 1248 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 124 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
746 WWUS71 KPHI 221258 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 858 AM EDT Thu Apr 22 2021 NJZ001-007>010-PAZ060>062-101>103-105-222000- /O.EXP.KPHI.FZ.W.0003.000000T0000Z-210422T1300Z/ /O.NEW.KPHI.FZ.A.0003.210423T0500Z-210423T1300Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Berks-Lehigh-Northampton- Western Chester-Eastern Chester-Western Montgomery-Upper Bucks- Including the cities of Newton, Washington, Morristown, Flemington, Somerville, Reading, Allentown, Bethlehem, Easton, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Chalfont, and Perkasie 858 AM EDT Thu Apr 22 2021 ...FREEZE WATCH IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY MORNING... ...FREEZE WARNING WILL EXPIRE AT 9 AM EDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 30 to 32 possible. * WHERE...Portions of northern New Jersey and eastern Pennsylvania. * WHEN...From late tonight through Friday morning. * IMPACTS...Freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ NJZ012-015-PAZ104-106-222000- /O.NEW.KPHI.FZ.A.0003.210423T0500Z-210423T1300Z/ Middlesex-Mercer-Eastern Montgomery-Lower Bucks- Including the cities of New Brunswick, Trenton, Norristown, Lansdale, Morrisville, and Doylestown 858 AM EDT Thu Apr 22 2021 ...FREEZE WATCH IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY MORNING... * WHAT...Sub-freezing temperatures as low as 32 possible. * WHERE...In New Jersey, Middlesex and Mercer. In Pennsylvania, Eastern Montgomery and Lower Bucks. * WHEN...From late tonight through Friday morning. * IMPACTS...Freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ NJZ013-020>022-027-222000- /O.NEW.KPHI.FZ.A.0003.210423T0500Z-210423T1300Z/ Western Monmouth-Ocean-Cumberland-Atlantic- Southeastern Burlington- Including the cities of Freehold, Jackson, Millville, Hammonton, and Wharton State Forest 858 AM EDT Thu Apr 22 2021 ...FREEZE WATCH IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY MORNING... * WHAT...Sub-freezing temperatures as low as 30 to 32 possible. * WHERE...Western Monmouth, Ocean, Cumberland, Atlantic and Southeastern Burlington. * WHEN...From late tonight through Friday morning. * IMPACTS...Freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
2 follow-up statements
196 WWUS71 KPHI 221407 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 1007 AM EDT Thu Apr 22 2021 NJZ001-007>010-012-015-PAZ060>062-101>106-222200- /O.CON.KPHI.FZ.A.0003.210423T0500Z-210423T1300Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer-Berks- Lehigh-Northampton-Western Chester-Eastern Chester- Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Trenton, Reading, Allentown, Bethlehem, Easton, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 1007 AM EDT Thu Apr 22 2021 ...FREEZE WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY MORNING... * WHAT...Sub-freezing temperatures as low as 30 to 32 possible. * WHERE...Portions of northern New Jersey and eastern Pennsylvania. * WHEN...From late tonight through Friday morning. * IMPACTS...Freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ NJZ013-020>022-027-222200- /O.CON.KPHI.FZ.A.0003.210423T0500Z-210423T1300Z/ Western Monmouth-Ocean-Cumberland-Atlantic- Southeastern Burlington- Including the cities of Freehold, Jackson, Millville, Hammonton, and Wharton State Forest 1007 AM EDT Thu Apr 22 2021 ...FREEZE WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY MORNING... * WHAT...Sub-freezing temperatures as low as 30 to 32 possible. * WHERE...Western Monmouth, Ocean, Cumberland, Atlantic and Southeastern Burlington. * WHEN...From late tonight through Friday morning. * IMPACTS...Freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Gorse
417 WWUS71 KPHI 221831 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 231 PM EDT Thu Apr 22 2021 NJZ001-007>010-012-013-015-020>022-027-PAZ060>062-101>106-231000- /O.UPG.KPHI.FZ.A.0003.210423T0500Z-210423T1300Z/ /O.NEW.KPHI.FZ.W.0004.210423T0500Z-210423T1300Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex- Western Monmouth-Mercer-Ocean-Cumberland-Atlantic- Southeastern Burlington-Berks-Lehigh-Northampton-Western Chester- Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks- Lower Bucks- Including the cities of Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Freehold, Trenton, Jackson, Millville, Hammonton, Wharton State Forest, Reading, Allentown, Bethlehem, Easton, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 231 PM EDT Thu Apr 22 2021 ...FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM EDT FRIDAY... * WHAT...Sub-freezing temperatures of 29 to 32 expected. * WHERE...Portions of northern to southern New Jersey and eastern Pennsylvania. * WHEN...From 1 AM to 9 AM EDT Friday. * IMPACTS...Freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take protective measures now as freezing temperatures will damage or kill tender plants and vegetation. Potted plants should be brought inside. && $$ DEZ001-NJZ016>019-PAZ070-071-231000- /O.NEW.KPHI.FR.Y.0001.210423T0500Z-210423T1300Z/ New Castle-Salem-Gloucester-Camden-Northwestern Burlington- Delaware-Philadelphia- Including the cities of Wilmington, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, and Philadelphia 231 PM EDT Thu Apr 22 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM EDT FRIDAY... * WHAT...Temperatures between 33 and 36 will result in areas of frost formation, mainly away from the Delaware River and outside of the urban centers such as Center City Philadelphia and Wilmington. * WHERE...In New Jersey, Salem, Gloucester, Camden and Northwestern Burlington. In Pennsylvania, Delaware and Philadelphia. In Delaware, New Castle. * WHEN...From 1 AM to 9 AM EDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ DEZ002-003-MDZ012-015-019-020-231000- /O.NEW.KPHI.FR.Y.0001.210423T0500Z-210423T1300Z/ Kent-Inland Sussex-Kent MD-Queen Annes-Talbot-Caroline- Including the cities of Dover, Georgetown, Chestertown, Centreville, Easton, and Denton 231 PM EDT Thu Apr 22 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM EDT FRIDAY... * WHAT...Temperatures between 33 and 36 will result in areas of frost formation, mainly away from the coasts of Chesapeake Bay and Delaware Bay and also outside of the urban centers. * WHERE...In Maryland, Kent MD, Queen Annes, Talbot and Caroline. In Delaware, Kent and Inland Sussex. * WHEN...From 1 AM to 9 AM EDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Gorse
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 2:31 PM EDT | Frost Advisory | PHI | Delaware, Philadelphia | 17 hr |
| Apr 22, 2:31 PM EDT | Freeze Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 17 hr |
| Apr 22, 7:32 PM EDT | Small Craft Advisory | PHI | 16 hr |
Nearby
Freeze Watches in New Jersey, 2021Freeze Watches in Pennsylvania, 2021Every freeze 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.