Alert archive / New Jersey / Freeze Watches in 2021
Freeze Watch 2, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this freeze watch at Apr 20, 2021, 8:48 PM EDT for 5 counties in New Jersey; 5 counties in Pennsylvania. It took effect at Apr 22, 2021, 2:00 AM EDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Apr 20, 2021, 8:48 PM EDT (00:48 UTC)
- In effect from
- Apr 22, 2021, 2:00 AM EDT
- Expired
- Apr 21, 2021, 3:26 AM EDT
- In force
- Issued by
- NWS Philadelphia/Mount Holly
Counties Hunterdon County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 96 km from the middle of the area, began a volume at 00:48 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 00:00Z, 0.8 hours before the alert went out and 191 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
- 1938 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 152 m²/s²
- 0-3 km storm-relative helicity
- 161 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
394 WWUS71 KPHI 210048 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 848 PM EDT Tue Apr 20 2021 NJZ001-007-008-PAZ061-062-211400- /O.NEW.KPHI.FZ.A.0002.210422T0600Z-210422T1300Z/ Sussex-Warren-Morris-Lehigh-Northampton- Including the cities of Newton, Washington, Morristown, Allentown, Bethlehem, and Easton 848 PM EDT Tue Apr 20 2021 ...FREEZE WATCH IN EFFECT FROM LATE WEDNESDAY NIGHT THROUGH THURSDAY MORNING... * WHAT...Sub-freezing temperatures as low as 29 possible. * WHERE...In New Jersey, Sussex, Warren and Morris. In Pennsylvania, Lehigh and Northampton. * WHEN...From late Wednesday night through Thursday morning. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. * ADDITIONAL DETAILS...Breezy conditions should prevent frost formation, however below freezing temperatures are possible Wednesday night and early Thursday morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ NJZ009-010-PAZ060-103-105-211400- /O.NEW.KPHI.FZ.A.0002.210422T0600Z-210422T1300Z/ Hunterdon-Somerset-Berks-Western Montgomery-Upper Bucks- Including the cities of Flemington, Somerville, Reading, Collegeville, Pottstown, Chalfont, and Perkasie 848 PM EDT Tue Apr 20 2021 ...FREEZE WATCH IN EFFECT FROM LATE WEDNESDAY NIGHT THROUGH THURSDAY MORNING... * WHAT...Sub-freezing temperatures as low as 31 possible. * WHERE...In New Jersey, Hunterdon and Somerset. In Pennsylvania, Berks, Western Montgomery and Upper Bucks. * WHEN...From late Wednesday night through Thursday morning. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. * ADDITIONAL DETAILS...Breezy conditions should prevent frost formation, however below freezing temperatures are possible Wednesday night and early Thursday morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Staarmann
1 follow-up statement
031 WWUS71 KPHI 210726 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 326 AM EDT Wed Apr 21 2021 NJZ001-007>010-PAZ060>062-103-105-212100- /O.UPG.KPHI.FZ.A.0002.210422T0600Z-210422T1300Z/ /O.NEW.KPHI.FZ.W.0003.210422T0500Z-210422T1300Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Berks-Lehigh-Northampton- Western Montgomery-Upper Bucks- Including the cities of Newton, Washington, Morristown, Flemington, Somerville, Reading, Allentown, Bethlehem, Easton, Collegeville, Pottstown, Chalfont, and Perkasie 326 AM EDT Wed Apr 21 2021 ...FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM EDT THURSDAY... * WHAT...Sub-freezing temperatures in the mid 20s to lower 30s expected. * WHERE...In New Jersey, Sussex, Warren, Morris, Hunterdon, and Somerset Counties. In Pennsylvania, Berks, Lehigh, Northampton, Western Montgomery, and Upper Bucks Counties. * WHEN...From 1 AM to 9 AM EDT Thursday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ PAZ101-102-212100- /O.NEW.KPHI.FZ.W.0003.210422T0500Z-210422T1300Z/ Western Chester-Eastern Chester- Including the cities of Honey Brook, Oxford, West Chester, and Kennett Square 326 AM EDT Wed Apr 21 2021 ...FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM EDT THURSDAY... * WHAT...Sub-freezing temperatures around 30 degrees expected. * WHERE...Chester County in Pennsylvania. * WHEN...From 1 AM to 9 AM EDT Thursday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CMS
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 3:26 AM EDT | Freeze Warning | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 30 hr |
| Apr 21, 12:25 PM EDT | Severe Thunderstorm Warning | PHI | Warren | 50 min |
| Apr 21, 12:51 PM EDT | Severe Thunderstorm Warning | PHI | Sussex, Warren | 21 min |
| Apr 21, 12:55 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 27 min |
| Apr 21, 1:10 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester, Mercer, Salem | 50 min |
| Apr 21, 1:17 PM EDT | Special Weather Statement | PHI | Hunterdon, Morris, Somerset, Sussex | 58 min |
| Apr 21, 1:28 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester | 36 min |
| Apr 21, 1:30 PM EDT | Special Marine Warning | PHI | 60 min | |
| Apr 21, 1:43 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Middlesex, Morris, Somerset | 33 min |
| Apr 21, 1:58 PM EDT | Special Weather Statement | PHI | Burlington, Camden, Monmouth, Ocean | 62 min |
| Apr 21, 2:02 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Monmouth, Ocean | 43 min |
| Apr 21, 2:03 PM EDT | Special Weather Statement | PHI | Cumberland | 27 min |
| Apr 21, 2:17 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Cumberland, Gloucester, Salem | 43 min |
| Apr 21, 2:28 PM EDT | Special Weather Statement | PHI | Middlesex, Monmouth | 47 min |
| Apr 21, 2:30 PM EDT | Special Marine Warning | PHI | 60 min | |
| Apr 21, 2:38 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 37 min |
| Apr 21, 2:40 PM EDT | Special Marine Warning | PHI | 55 min | |
| Apr 21, 2:43 PM EDT | Special Weather Statement | PHI | Cape May | 32 min |
| Apr 21, 2:50 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Ocean | 40 min |
| Apr 21, 3:02 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic | 28 min |
| Apr 21, 3:07 PM EDT | Special Marine Warning | PHI | 53 min | |
| Apr 21, 12:03 PM EDT | Special Weather Statement | PHI | Chester, Lehigh | 42 min |
| Apr 21, 12:17 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 43 min |
| Apr 21, 12:54 PM EDT | Special Weather Statement | PHI | Delaware | 36 min |
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.