Alert archive / Pennsylvania / Freeze Warnings in 2018
Freeze Warning 2, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this freeze warning at Apr 19, 2018, 3:04 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania; Cecil County, Maryland. It took effect at Apr 20, 2018, 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 19, 2018, 3:04 PM EDT (19:04 UTC)
- In effect from
- Apr 20, 2018, 2:00 AM EDT
- Expired
- Apr 20, 2018, 8:00 AM EDT
- In force
- 6 hr
- Issued by
- NWS Philadelphia/Mount Holly
Counties Cecil County, MD, Berks County, PA, Chester County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 114 km from the middle of the area, began a volume at 19:05 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.1 hours before the alert went out and 187 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
- 1338 m above ground
- 0-6 km bulk shear
- 84 kt
- 0-1 km storm-relative helicity
- -187 m²/s²
- 0-3 km storm-relative helicity
- -250 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
585 WWUS71 KPHI 191904 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 304 PM EDT Thu Apr 19 2018 MDZ008-PAZ060-101>103-201200- /O.NEW.KPHI.FZ.W.0002.180420T0600Z-180420T1200Z/ Cecil-Berks-Western Chester-Eastern Chester-Western Montgomery- Including the cities of Elkton, Reading, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, and Pottstown 304 PM EDT Thu Apr 19 2018 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 8 AM EDT FRIDAY... The National Weather Service in Mount Holly has issued a Freeze Warning, which is in effect from 2 AM to 8 AM EDT Friday. * TEMPERATURES...Lows early Saturday morning should be in the low 30s. * IMPACTS...Frost and freeze conditions may damage sensitive vegetation. Take steps now to protect tender plants from the cold. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. && $$
2 follow-up statements
842 WWUS71 KPHI 191907 CCA NPWPHI URGENT - WEATHER MESSAGE...CORRECTED National Weather Service Mount Holly NJ 307 PM EDT Thu Apr 19 2018 MDZ008-PAZ060-101>103-201200- /O.COR.KPHI.FZ.W.0002.180420T0600Z-180420T1200Z/ Cecil-Berks-Western Chester-Eastern Chester-Western Montgomery- Including the cities of Elkton, Reading, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, and Pottstown 307 PM EDT Thu Apr 19 2018 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 8 AM EDT FRIDAY... The National Weather Service in Mount Holly has issued a Freeze Warning, which is in effect from 2 AM to 8 AM EDT Friday. * TEMPERATURES...Lows early Friday morning should be in the low 30s. * IMPACTS...Frost and freeze conditions may damage sensitive vegetation. Take steps now to protect tender plants from the cold. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. && $$
552 WWUS71 KPHI 200930 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 530 AM EDT Fri Apr 20 2018 MDZ008-PAZ060-101>103-201200- /O.CON.KPHI.FZ.W.0002.000000T0000Z-180420T1200Z/ Cecil-Berks-Western Chester-Eastern Chester-Western Montgomery- Including the cities of Elkton, Reading, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, and Pottstown 530 AM EDT Fri Apr 20 2018 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM EDT THIS MORNING... * TEMPERATURES...In the lower 30s early this morning. * IMPACTS...Freezing temperatures may damage sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... This Freeze Warning means that freezing temperatures are imminent in parts of the warned area. Sensitive vegetation may be damaged by the cold. && $$ Iovino
Nearby
Freeze Warnings in Pennsylvania, 2018Freeze Warnings in Maryland, 2018Every freeze warning in 2018
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.