Alert archive / New Jersey / Frost Advisories in 2021
Frost Advisory 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this frost advisory at Apr 22, 2021, 2:31 PM EDT for 4 states. It took effect at Apr 23, 2021, 1:00 AM EDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Apr 22, 2021, 2:31 PM EDT (18:31 UTC)
- In effect from
- Apr 23, 2021, 1:00 AM EDT
- Expired
- Apr 23, 2021, 7:48 AM EDT
- In force
- 7 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, Salem County, NJ, Delaware County, PA, Philadelphia County, PA
The radar
The Dover AFB radar (KDOX), 64 km from the middle of the area, began a volume at 18:30 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
Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.5 hours before the alert went out and 163 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
- 1590 m above ground
- 0-6 km bulk shear
- 104 kt
- 0-1 km storm-relative helicity
- -116 m²/s²
- 0-3 km storm-relative helicity
- -31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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. && $$ Gorse
2 follow-up statements
664 WWUS71 KPHI 230802 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 402 AM EDT Fri Apr 23 2021 NJZ001-007>010-012-013-015-020>022-027-PAZ060>062-101>106-231300- /O.CON.KPHI.FZ.W.0004.000000T0000Z-210423T1300Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex- Western Monmouth-Mercer-Ocean-Cumberland-Atlantic- Southeastern Burlington-Berks-Lehigh-Northampton-Western Chester- Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks- Lower Bucks- Including the cities of Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Freehold, Trenton, Jackson, Millville, Hammonton, Wharton State Forest, Reading, Allentown, Bethlehem, Easton, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 402 AM EDT Fri Apr 23 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING... * WHAT...Sub-freezing temperatures of 29 to 32 expected. * WHERE...Portions of northern to southern New Jersey and eastern Pennsylvania. * WHEN...From 1 AM to 9 AM EDT Friday. * IMPACTS...Freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take protective measures now as freezing temperatures will damage or kill tender plants and vegetation. Potted plants should be brought inside. && $$ DEZ001-NJZ016>019-PAZ070-071-231300- /O.CON.KPHI.FR.Y.0001.000000T0000Z-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 402 AM EDT Fri Apr 23 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING... * 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. && $$ DEZ002-003-MDZ012-015-019-020-231300- /O.CON.KPHI.FR.Y.0001.000000T0000Z-210423T1300Z/ Kent-Inland Sussex-Kent MD-Queen Annes-Talbot-Caroline- Including the cities of Dover, Georgetown, Chestertown, Centreville, Easton, and Denton 402 AM EDT Fri Apr 23 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING... * WHAT...Temperatures between 33 and 36 will result in areas of frost formation, mainly away from the coasts of Chesapeake Bay and Delaware Bay and also outside of the urban centers. * WHERE...In Maryland, Kent MD, Queen Annes, Talbot and Caroline. In Delaware, Kent and Inland Sussex. * WHEN...From 1 AM to 9 AM EDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
578 WWUS71 KPHI 231148 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 748 AM EDT Fri Apr 23 2021 NJZ001-007>010-012-013-015-020>022-027-PAZ060>062-101>106-231300- /O.CAN.KPHI.FZ.W.0004.000000T0000Z-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 748 AM EDT Fri Apr 23 2021 ...FREEZE WARNING IS CANCELLED... Temperatures are above freeze and will continue to increase through the day. $$ DEZ001>003-MDZ012-015-019-020-NJZ016>019-PAZ070-071-231300- /O.CAN.KPHI.FR.Y.0001.000000T0000Z-210423T1300Z/ New Castle-Kent-Inland Sussex-Kent MD-Queen Annes-Talbot-Caroline- Salem-Gloucester-Camden-Northwestern Burlington-Delaware- Philadelphia- Including the cities of Wilmington, Dover, Georgetown, Chestertown, Centreville, Easton, Denton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, and Philadelphia 748 AM EDT Fri Apr 23 2021 ...FROST ADVISORY IS CANCELLED... Temperatures are rising to near 40 and will continue to increase through the day. $$ Gorse
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 8:58 AM EDT | Freeze Watch | PHI | Atlantic, Burlington, Cumberland, Hunterdon, Mercer, Middlesex and 6 more | 6 hr |
| Apr 22, 2:31 PM EDT | Freeze Warning | PHI | Atlantic, Burlington, Cumberland, Hunterdon, Mercer, Middlesex and 6 more | 17 hr |
| Apr 22, 7:32 PM EDT | Small Craft Advisory | PHI | 16 hr |
Nearby
Frost Advisories in New Jersey, 2021Frost Advisories in Maryland, 2021Frost Advisories in Delaware, 2021Every frost advisory 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.