Alert archive / New Jersey / Freeze Warnings in 2020
Freeze Warning 4, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this freeze warning at Apr 21, 2020, 3:34 AM EDT for 4 states. It took effect at Apr 22, 2020, 2:00 AM EDT. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 21, 2020, 3:34 AM EDT (07:34 UTC)
- In effect from
- Apr 22, 2020, 2:00 AM EDT
- Expired
- Apr 22, 2020, 8:00 AM EDT
- In force
- 6 hr
- Issued by
- NWS Philadelphia/Mount Holly
All 32 counties
Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Salem 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 nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 7.6 hours before the alert went out and 217 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
- 1797 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 157 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
450 WWUS71 KPHI 210734 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 334 AM EDT Tue Apr 21 2020 DEZ001-MDZ008-NJZ001-007>010-012-013-015>023-027-PAZ060>062-070- 071-101>106-212200- /O.NEW.KPHI.FZ.W.0004.200422T0600Z-200422T1200Z/ New Castle-Cecil-Sussex-Warren-Morris-Hunterdon-Somerset- Middlesex-Western Monmouth-Mercer-Salem-Gloucester-Camden- Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May- Southeastern Burlington-Berks-Lehigh-Northampton-Delaware- Philadelphia-Western Chester-Eastern Chester-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Wilmington, Elkton, Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Freehold, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Millville, Hammonton, Cape May Court House, Wharton State Forest, Reading, Allentown, Bethlehem, Easton, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 334 AM EDT Tue Apr 21 2020 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 8 AM EDT WEDNESDAY... * WHAT...Sub-freezing temperatures as low as the upper 20s and lower 30s are expected. * WHERE...The Lehigh Valley and southeastern Pennsylvania, much of New Jersey, northern Delaware and extreme northeastern Maryland. * WHEN...From 2:00 AM until 8:00 AM Wednesday. * IMPACTS...Freezing conditions could kill sensitive plants. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect sensitive plants from the cold. && $$ Iovino
3 follow-up statements
358 WWUS71 KPHI 211934 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 334 PM EDT Tue Apr 21 2020 DEZ002-003-MDZ012-015-019-020-221000- /O.EXA.KPHI.FZ.W.0004.200422T0600Z-200422T1200Z/ Kent-Inland Sussex-Kent MD-Queen Annes-Talbot-Caroline- Including the cities of Dover, Georgetown, Chestertown, Centreville, Easton, and Denton 334 PM EDT Tue Apr 21 2020 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 8 AM EDT WEDNESDAY... * WHAT...Sub-freezing temperatures as low as the upper 20s and lower 30s are expected. * WHERE...Northeast Maryland. Central and southern Delaware. * WHEN...From 2:00 AM until 8:00 AM Wednesday. * IMPACTS...Freezing conditions could kill sensitive plants. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ DEZ001-MDZ008-NJZ001-007>010-012-013-015>023-027-PAZ060>062-070- 071-101>106-221000- /O.CON.KPHI.FZ.W.0004.200422T0600Z-200422T1200Z/ New Castle-Cecil-Sussex-Warren-Morris-Hunterdon-Somerset- Middlesex-Western Monmouth-Mercer-Salem-Gloucester-Camden- Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May- Southeastern Burlington-Berks-Lehigh-Northampton-Delaware- Philadelphia-Western Chester-Eastern Chester-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Wilmington, Elkton, Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Freehold, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Millville, Hammonton, Cape May Court House, Wharton State Forest, Reading, Allentown, Bethlehem, Easton, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 334 PM EDT Tue Apr 21 2020 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM EDT WEDNESDAY... * WHAT...Sub-freezing temperatures as low as the upper 20s and lower 30s are expected. * WHERE...The Lehigh Valley and southeastern Pennsylvania, much of New Jersey, northern Delaware and extreme northeastern Maryland. * WHEN...From 2:00 AM until 8:00 AM Wednesday. * IMPACTS...Freezing conditions could kill sensitive plants. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
713 WWUS71 KPHI 220720 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 320 AM EDT Wed Apr 22 2020 DEZ001>003-MDZ008-012-015-019-020-NJZ001-007>010-012-013-015>023- 027-PAZ060>062-070-071-101>106-221200- /O.CON.KPHI.FZ.W.0004.000000T0000Z-200422T1200Z/ New Castle-Kent-Inland Sussex-Cecil-Kent MD-Queen Annes-Talbot- Caroline-Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex- Western Monmouth-Mercer-Salem-Gloucester-Camden- Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May- Southeastern Burlington-Berks-Lehigh-Northampton-Delaware- Philadelphia-Western Chester-Eastern Chester-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Wilmington, Dover, Georgetown, Elkton, Chestertown, Centreville, Easton, Denton, Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Freehold, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Millville, Hammonton, Cape May Court House, Wharton State Forest, Reading, Allentown, Bethlehem, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 320 AM EDT Wed Apr 22 2020 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM EDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as the upper 20s and lower 30s are expected. * WHERE...Portions of central, northern, northwest and southern New Jersey, east central and southeast Pennsylvania, northeast Maryland and central, northern and southern Delaware. * WHEN...Until 8 AM EDT this morning. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
381 WWUS71 KPHI 221201 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 801 AM EDT Wed Apr 22 2020 DEZ001>003-MDZ008-012-015-019-020-NJZ001-007>010-012-013-015>023- 027-PAZ060>062-070-071-101>106-221315- /O.EXP.KPHI.FZ.W.0004.000000T0000Z-200422T1200Z/ New Castle-Kent-Inland Sussex-Cecil-Kent MD-Queen Annes-Talbot- Caroline-Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex- Western Monmouth-Mercer-Salem-Gloucester-Camden- Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May- Southeastern Burlington-Berks-Lehigh-Northampton-Delaware- Philadelphia-Western Chester-Eastern Chester-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Wilmington, Dover, Georgetown, Elkton, Chestertown, Centreville, Easton, Denton, Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Freehold, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Millville, Hammonton, Cape May Court House, Wharton State Forest, Reading, Allentown, Bethlehem, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 801 AM EDT Wed Apr 22 2020 ...FREEZE WARNING HAS EXPIRED... Temperatures are above freezing across the area. Therefore, the freeze warning was allowed to expire. $$ CMS
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 1:38 PM EDT | Special Weather Statement | PHI | New Castle | 52 min |
| Apr 21, 1:49 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 56 min |
| Apr 21, 2:04 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle, Sussex | 56 min |
| Apr 21, 2:46 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle, Sussex | 74 min |
| Apr 21, 12:48 PM EDT | Special Weather Statement | PHI | Bucks, Chester, Montgomery | 42 min |
| Apr 21, 1:04 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Northampton, Philadelphia | 26 min |
| Apr 21, 1:28 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 32 min |
| Apr 21, 1:59 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 61 min |
| Apr 21, 11:44 AM EDT | Coastal Flood Statement | PHI | Ocean | 5 hr |
| Apr 21, 12:23 PM EDT | Special Weather Statement | PHI | Monmouth | 37 min |
| Apr 21, 2:17 PM EDT | Special Marine Warning | PHI | 58 min | |
| Apr 21, 2:24 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more | 66 min |
| Apr 21, 2:55 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Monmouth, Ocean | 35 min |
| Apr 21, 3:04 PM EDT | Special Marine Warning | PHI | 116 min |
Nearby
Freeze Warnings in New Jersey, 2020Freeze Warnings in Pennsylvania, 2020Freeze Warnings in Maryland, 2020Every freeze warning in 2020
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.