Weather Warnings for Pennsylvania

Issued by the National Weather Service

Current watches, warnings, and advisories for Pennsylvania
Alerts Updated: April 20, 2026, 6:26 am  UTC


Frost Advisory issued April 20 at 2:25AM EDT until April 20 at 8:00AM EDT by NWS Mount Holly NJ

Summary: * WHAT...For the Frost Advisory, temperatures as low as 33 will result in frost formation. For the Freeze Warning, sub-freezing temperatures as low as 26 expected. * WHERE...In New Jersey, Morris, Somerset, Warren, and Hunterdon Counties. In Pennsylvania, Northampton County. * WHEN...For the Frost Advisory, until 8 AM EDT this morning. For the Freeze Warning, from midnight tonight to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Severity:  Minor    Effective:  April 20, 2026, 2:25 am      Expires:  April 20, 2026, 4:00 pm
Area:  Warren; Morris; Hunterdon; Somerset; Northampton


Freeze Warning issued April 20 at 2:25AM EDT until April 21 at 9:00AM EDT by NWS Mount Holly NJ

Summary: * WHAT...For the first Freeze Warning, sub-freezing temperatures as low as 26. For the second Freeze Warning, sub-freezing temperatures as low as 22 expected. * WHERE...In New Jersey, Sussex County. In Pennsylvania, Carbon and Monroe Counties. * WHEN...For the first Freeze Warning, until 10 AM EDT this morning. For the second Freeze Warning, from midnight tonight to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Severity:  Moderate    Effective:  April 20, 2026, 2:25 am      Expires:  April 20, 2026, 4:00 pm
Area:  Sussex; Carbon; Monroe


Freeze Warning issued April 20 at 2:25AM EDT until April 21 at 9:00AM EDT by NWS Mount Holly NJ

Summary: * WHAT...Sub-freezing temperatures as low as 26 expected. * WHERE...Portions of central, northern, and southern New Jersey and east central and southeast Pennsylvania. * WHEN...From midnight tonight to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Severity:  Moderate    Effective:  April 20, 2026, 2:25 am      Expires:  April 20, 2026, 4:00 pm
Area:  Middlesex; Western Monmouth; Mercer; Salem; Gloucester; Camden; Northwestern Burlington; Ocean; Cumberland; Atlantic; Cape May; Southeastern Burlington; Berks; Lehigh; Western Chester; Eastern Chester; Western Montgomery; Eastern Montgomery; Upper Bucks; Lower Bucks


Freeze Warning issued April 20 at 2:25AM EDT until April 21 at 9:00AM EDT by NWS Mount Holly NJ

Summary: * WHAT...For the Frost Advisory, temperatures as low as 33 will result in frost formation. For the Freeze Warning, sub-freezing temperatures as low as 26 expected. * WHERE...In New Jersey, Morris, Somerset, Warren, and Hunterdon Counties. In Pennsylvania, Northampton County. * WHEN...For the Frost Advisory, until 8 AM EDT this morning. For the Freeze Warning, from midnight tonight to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Severity:  Moderate    Effective:  April 20, 2026, 2:25 am      Expires:  April 20, 2026, 4:00 pm
Area:  Warren; Morris; Hunterdon; Somerset; Northampton


Freeze Warning issued April 20 at 2:25AM EDT until April 21 at 9:00AM EDT by NWS Mount Holly NJ

Summary: * WHAT...Sub-freezing temperatures as low as 27 expected. * WHERE...In Delaware, New Castle County. In Pennsylvania, Delaware and Philadelphia Counties. * WHEN...From midnight tonight to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Severity:  Moderate    Effective:  April 20, 2026, 2:25 am      Expires:  April 20, 2026, 4:00 pm
Area:  New Castle; Delaware; Philadelphia


Freeze Warning issued April 20 at 2:25AM EDT until April 20 at 10:00AM EDT by NWS Mount Holly NJ

Summary: * WHAT...For the first Freeze Warning, sub-freezing temperatures as low as 26. For the second Freeze Warning, sub-freezing temperatures as low as 22 expected. * WHERE...In New Jersey, Sussex County. In Pennsylvania, Carbon and Monroe Counties. * WHEN...For the first Freeze Warning, until 10 AM EDT this morning. For the second Freeze Warning, from midnight tonight to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Severity:  Moderate    Effective:  April 20, 2026, 2:25 am      Expires:  April 20, 2026, 4:00 pm
Area:  Sussex; Carbon; Monroe


Freeze Warning issued April 20 at 1:14AM EDT until April 21 at 11:00AM EDT by NWS State College PA

Summary: * WHAT...For the first Freeze Warning, sub-freezing temperatures as low as 25. For the second Freeze Warning, sub-freezing temperatures as low as 22 expected. * WHERE...Cameron, Clearfield, Elk, McKean, Northern Centre, Northern Clinton, and Warren Counties. * WHEN...For the first Freeze Warning, until 9 AM EDT this morning. For the second Freeze Warning, from midnight tonight to 11 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Severity:  Moderate    Effective:  April 20, 2026, 1:14 am      Expires:  April 20, 2026, 12:00 pm
Area:  Warren; McKean; Elk; Cameron; Northern Clinton; Clearfield; Northern Centre


Freeze Warning issued April 20 at 1:14AM EDT until April 21 at 9:00AM EDT by NWS State College PA

Summary: * WHAT...Sub-freezing temperatures as low as 27 expected. * WHERE...A portion of central Pennsylvania. * WHEN...From midnight tonight to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Severity:  Moderate    Effective:  April 20, 2026, 1:14 am      Expires:  April 20, 2026, 12:00 pm
Area:  Huntingdon; Mifflin; Juniata; Fulton; Franklin; Union; Snyder; Montour; Northumberland; Columbia; Perry; Dauphin; Schuylkill; Lebanon; Cumberland; Adams; York; Lancaster


Freeze Warning issued April 20 at 1:14AM EDT until April 21 at 9:00AM EDT by NWS State College PA

Summary: * WHAT...For the first Freeze Warning, sub-freezing temperatures as low as 31. For the second Freeze Warning, sub-freezing temperatures as low as 24 expected. * WHERE...Bedford, Blair, Cambria, Somerset, Southern Centre, Southern Clinton, and Southern Lycoming Counties. * WHEN...For the first Freeze Warning, until 9 AM EDT this morning. For the second Freeze Warning, from midnight tonight to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Severity:  Moderate    Effective:  April 20, 2026, 1:14 am      Expires:  April 20, 2026, 12:00 pm
Area:  Southern Centre; Cambria; Blair; Somerset; Bedford; Southern Clinton; Southern Lycoming


Freeze Warning issued April 20 at 1:14AM EDT until April 20 at 9:00AM EDT by NWS State College PA

Summary: * WHAT...For the first Freeze Warning, sub-freezing temperatures as low as 31. For the second Freeze Warning, sub-freezing temperatures as low as 24 expected. * WHERE...Bedford, Blair, Cambria, Somerset, Southern Centre, Southern Clinton, and Southern Lycoming Counties. * WHEN...For the first Freeze Warning, until 9 AM EDT this morning. For the second Freeze Warning, from midnight tonight to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Severity:  Moderate    Effective:  April 20, 2026, 1:14 am      Expires:  April 20, 2026, 12:00 pm
Area:  Southern Centre; Cambria; Blair; Somerset; Bedford; Southern Clinton; Southern Lycoming


Freeze Warning issued April 20 at 1:14AM EDT until April 20 at 9:00AM EDT by NWS State College PA

Summary: * WHAT...For the first Freeze Warning, sub-freezing temperatures as low as 25. For the second Freeze Warning, sub-freezing temperatures as low as 22 expected. * WHERE...Cameron, Clearfield, Elk, McKean, Northern Centre, Northern Clinton, and Warren Counties. * WHEN...For the first Freeze Warning, until 9 AM EDT this morning. For the second Freeze Warning, from midnight tonight to 11 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Severity:  Moderate    Effective:  April 20, 2026, 1:14 am      Expires:  April 20, 2026, 12:00 pm
Area:  Warren; McKean; Elk; Cameron; Northern Clinton; Clearfield; Northern Centre


Freeze Warning issued April 20 at 12:56AM EDT until April 21 at 10:00AM EDT by NWS Cleveland OH

Summary: * WHAT...Sub-freezing temperatures as cold as the middle 20's to lower 30's expected. * WHERE...Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN...For the first Freeze Warning, until 11 AM EDT this morning. For the second Freeze Warning, from 8 PM this evening to 10 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Severity:  Moderate    Effective:  April 20, 2026, 12:56 am      Expires:  April 20, 2026, 11:00 am
Area:  Erie; Lorain; Cuyahoga; Lake; Geauga; Ashtabula Inland; Seneca; Huron; Medina; Summit; Portage; Trumbull; Wyandot; Crawford; Richland; Ashland; Wayne; Stark; Mahoning; Marion; Morrow; Holmes; Knox; Ashtabula Lakeshore; Northern Erie; Southern Erie; Crawford


Freeze Warning issued April 20 at 12:56AM EDT until April 20 at 11:00AM EDT by NWS Cleveland OH

Summary: * WHAT...Sub-freezing temperatures as cold as the middle 20's to lower 30's expected. * WHERE...Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN...For the first Freeze Warning, until 11 AM EDT this morning. For the second Freeze Warning, from 8 PM this evening to 10 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Severity:  Moderate    Effective:  April 20, 2026, 12:56 am      Expires:  April 20, 2026, 11:00 am
Area:  Erie; Lorain; Cuyahoga; Lake; Geauga; Ashtabula Inland; Seneca; Huron; Medina; Summit; Portage; Trumbull; Wyandot; Crawford; Richland; Ashland; Wayne; Stark; Mahoning; Marion; Morrow; Holmes; Knox; Ashtabula Lakeshore; Northern Erie; Southern Erie; Crawford


Frost Advisory issued April 20 at 12:48AM EDT until April 20 at 10:00AM EDT by NWS Pittsburgh PA

Summary: * WHAT...For the Frost Advisory, temperatures in the lower to mid 30s could result in localized frost formation in the coldest locations. For the Freeze Warning, sub-freezing temperatures in the mid 20s to near 30 expected. * WHERE...Portions of east central Ohio, western Pennsylvania, and northern West Virginia. * WHEN...For the Frost Advisory, until 10 AM EDT this morning. For the Freeze Warning, from 11 PM this evening to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation.
Severity:  Minor    Effective:  April 20, 2026, 12:48 am      Expires:  April 20, 2026, 11:15 am
Area:  Belmont; Noble; Monroe; Allegheny; Washington; Greene; Westmoreland; Fayette; Brooke; Ohio; Marshall; Wetzel; Marion; Monongalia


Freeze Warning issued April 20 at 12:48AM EDT until April 20 at 10:00AM EDT by NWS Pittsburgh PA

Summary: * WHAT...Sub-freezing temperatures in the mid 20s to around 30. * WHERE...Portions of east central Ohio, western Pennsylvania, and northern West Virginia. * WHEN...For the first Freeze Warning, until 10 AM EDT this morning. For the second Freeze Warning, from 11 PM this evening to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation.
Severity:  Moderate    Effective:  April 20, 2026, 12:48 am      Expires:  April 20, 2026, 11:15 am
Area:  Tuscarawas; Carroll; Columbiana; Coshocton; Harrison; Jefferson; Muskingum; Guernsey; Mercer; Venango; Forest; Lawrence; Butler; Clarion; Jefferson; Beaver; Armstrong; Westmoreland Ridges; Fayette Ridges; Indiana; Higher Elevations of Indiana; Hancock; Ridges of Eastern Monongalia and Northwestern Preston; Preston; Eastern Preston; Western Tucker; Eastern Tucker


Freeze Warning issued April 20 at 12:48AM EDT until April 21 at 9:00AM EDT by NWS Pittsburgh PA

Summary: * WHAT...Sub-freezing temperatures in the mid 20s to around 30. * WHERE...Portions of east central Ohio, western Pennsylvania, and northern West Virginia. * WHEN...For the first Freeze Warning, until 10 AM EDT this morning. For the second Freeze Warning, from 11 PM this evening to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation.
Severity:  Moderate    Effective:  April 20, 2026, 12:48 am      Expires:  April 20, 2026, 11:15 am
Area:  Tuscarawas; Carroll; Columbiana; Coshocton; Harrison; Jefferson; Muskingum; Guernsey; Mercer; Venango; Forest; Lawrence; Butler; Clarion; Jefferson; Beaver; Armstrong; Westmoreland Ridges; Fayette Ridges; Indiana; Higher Elevations of Indiana; Hancock; Ridges of Eastern Monongalia and Northwestern Preston; Preston; Eastern Preston; Western Tucker; Eastern Tucker


Freeze Warning issued April 20 at 12:48AM EDT until April 21 at 9:00AM EDT by NWS Pittsburgh PA

Summary: * WHAT...For the Frost Advisory, temperatures in the lower to mid 30s could result in localized frost formation in the coldest locations. For the Freeze Warning, sub-freezing temperatures in the mid 20s to near 30 expected. * WHERE...Portions of east central Ohio, western Pennsylvania, and northern West Virginia. * WHEN...For the Frost Advisory, until 10 AM EDT this morning. For the Freeze Warning, from 11 PM this evening to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation.
Severity:  Moderate    Effective:  April 20, 2026, 12:48 am      Expires:  April 20, 2026, 11:15 am
Area:  Belmont; Noble; Monroe; Allegheny; Washington; Greene; Westmoreland; Fayette; Brooke; Ohio; Marshall; Wetzel; Marion; Monongalia