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Severe thunderstorm watch #455 issued by the NWS until 9pm

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Summary: 

A cold front will press eastward today with a warm front lifting northward across NE PA concurrently. The warm sector created in between the two fronts will become the focus of scattered showers and thunderstorms this afternoon and evening, with some localized flash flooding and frequent lightning being the main threats.

***SEVERE THUNDERSTORM WATCH #455 HAS BEEN ISSUED BY THE NATIONAL WEATHER SERVICE STORM PREDICTION CENTER UNTIL 9PM THIS EVENING – SEE SEVERE WATCH SECTION BELOW FOR DETAILS***

Impacts and Timing:

Timing is Friday afternoon and evening from west to east, affecting mainly the central and southern portions of our coverage area. 

For more specific and advanced timing, impacts, and amounts by location for all storm events, including real-time updates as storms head toward your county, click on the My Pocket Meteorologist image below for more information and to sign up.

Impacts include in order of threat level:

  1. Localized flash flooding with high PWAT and dewpoints expected, in combination with lower shear and slower storm motion.
  2. Frequent cloud to ground lightning
  3. Gusty winds, mainly a wet microburst/downburst isolated and hyper-local threat
  4. Small hail generally under 3/4″
  5. Isolated tornado/funnel

SEVERE T-STORM WATCH #495 OUTLINE:

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Severe thunderstorm watch #455 has been issued by the NWS/SPC until 9pm this evening for the following EPAWA coverage area counties:

In Pennsylvania:  Wayne, Pike, Wyoming, Luzerne, Lackawanna, Pike, Northumberland, Montour, Columbia, Franklin, Adams, Perry, Cumberland, York, Dauphin, Lebanon, Lancaster, Schuylkill, Berks, Carbon, Monroe, Lehigh, Northampton, Chester, Montgomery, Bucks, Delaware, Philadelphia

In New Jersey: ALL counties

In Maryland: ALL counties

In Delaware: ALL counties

Per NWS/SPC, Primary threats include…

*Scattered damaging wind gusts to 70 mph possible
*Isolated large hail events to 1.5 inches in diameter possible

SEVERE POTENTIAL FROM NWS/SPC - CLICK TO ENLARGE

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What does this mean? See chart below.

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TECHNICAL DISCUSSION

We feel that the overall severe threat is low, and the areas SE of the red line drawn on the SPC map above we feel sees the best chance to see severe weather based on latest radar and satellite trends. This threat today will be mostly from flash flooding and frequent cloud to ground lightning, but an isolated wet microburst/downburst is possible in the severe outlook zone on a hyper-local basis.

Click on any image below to enlarge

Highest frequency of lightning today per HRRR

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Latest from the WPC regarding flash flood potential

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Forecaster:  Martrich
Weather Alerts last updated:  2:25pm Friday August 18th, 2017 

Current Watches, Warnings and Advisories for Pennsylvania Issued by the National Weather Service

The National Weather Service in Mount Holly NJ has issued a * Severe Thunderstorm Warning for... Central Berks County in eastern Pennsylvania... West central Lehigh County in eastern Pennsylvania... * Until 315 PM EDT * At 232 PM EDT, a severe thunderstorm was located near Womelsdorf,
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 6:33 pm
The National Weather Service in State College PA has issued a * Severe Thunderstorm Warning for... Lebanon County in south central Pennsylvania... * Until 315 PM EDT * At 232 PM EDT, a severe thunderstorm was located over Cleona, moving east at 35 mph.
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 6:32 pm
SEVERE THUNDERSTORM WATCH 455 IS IN EFFECT UNTIL 900 PM EDT FOR THE FOLLOWING LOCATIONS PA . PENNSYLVANIA COUNTIES INCLUDED ARE ADAMS BERKS BUCKS CARBON CHESTER COLUMBIA
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 6:25 pm
...A STRONG THUNDERSTORM WILL AFFECT CENTRAL BERKS AND NORTHWESTERN LEHIGH COUNTIES... At 220 PM EDT, a line of strong thunderstorms was located over far western Berks County, moving east at 30 mph. Winds up to 40 mph and pea size hail are possible with this storm. Locations impacted include...
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 6:21 pm
...A STRONG THUNDERSTORM WILL AFFECT PARTS OF SCHUYLKILL...DAUPHIN... AND LEBANON COUNTIES UNTIL 300 PM EDT... At 221 PM EDT, Doppler radar indicated a strong thunderstorm near Penn National Race Course, moving northeast at 40 mph. Winds in excess of 40 mph are possible. Locations impacted include...
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 6:21 pm
The National Weather Service in Mount Holly NJ has issued a * Flood Advisory for... Northern Berks County in eastern Pennsylvania... Northwestern Lehigh County in eastern Pennsylvania... South central Carbon County in northeastern Pennsylvania... * Until 615 PM EDT
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 6:10 pm
...STRONG THUNDERSTORMS WILL AFFECT PARTS OF FRANKLIN...MIFFLIN... JUNIATA...CUMBERLAND...AND PERRY COUNTIES UNTIL 245 PM EDT... At 209 PM EDT, Doppler radar indicated strong thunderstorms along a line extending from near Blacklog to near East Waterford to near Doylesburg. Movement was east at 30 mph. Wind gusts up to 50 mph are possible.
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 6:10 pm
...A STRONG THUNDERSTORM WILL AFFECT PARTS OF SCHUYLKILL... NORTHUMBERLAND...MONTOUR...AND COLUMBIA COUNTIES UNTIL 245 PM EDT... At 201 PM EDT, Doppler radar indicated a strong thunderstorm over Elysburg, moving east at 25 mph. Winds in excess of 40 mph are possible. Locations impacted include...
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 6:02 pm
The National Weather Service in Binghamton has issued a * Urban and Small Stream Flood Advisory for... Southeastern Broome County in central New York... Southwestern Delaware County in central New York... Susquehanna County in northeastern Pennsylvania... Northwestern Wayne County in northeastern Pennsylvania...
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 4:50 pm
...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... The Flash Flood Watch continues for * Portions of Delaware, northeast Maryland, New Jersey, and Pennsylvania, including the following areas, in Delaware, Kent and New Castle. In northeast Maryland, Caroline, Cecil, Kent
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 4:19 pm
...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH LATE TONIGHT... * LOCATIONS...LAKE ERIE BEACHES FROM LORAIN COUNTY OHIO TO ERIE COUNTY PENNSYLVANIA. * TIMING...FROM 11 AM THROUGH LATE TONIGHT. * IMPACTS...HIGH SWIMMING RISK FROM WAVES AND DANGEROUS CURRENTS.
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 1:21 pm

Current Watches, Warnings and Advisories for New Jersey Issued by the National Weather Service

SEVERE THUNDERSTORM WATCH 455 IS IN EFFECT UNTIL 900 PM EDT FOR THE FOLLOWING LOCATIONS NJ . NEW JERSEY COUNTIES INCLUDED ARE ATLANTIC BERGEN BURLINGTON CAMDEN CAPE MAY CUMBERLAND
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 6:25 pm
...Heavy Showers and Thunderstorms through Early Tonight... .As a cold front moves slowly east toward the area, narrow bands of heavy showers and thunderstorms will move northeast across the area. ...FLASH FLOOD WATCH IN EFFECT UNTIL 11 PM EDT THIS EVENING... The National Weather Service in Upton has issued a * Flash Flood Watch for portions of southern Connecticut,
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 5:06 pm
...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... The Flash Flood Watch continues for * Portions of Delaware, northeast Maryland, New Jersey, and Pennsylvania, including the following areas, in Delaware, Kent and New Castle. In northeast Maryland, Caroline, Cecil, Kent
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 4:19 pm

Current Watches, Warnings and Advisories for Delaware Issued by the National Weather Service

SEVERE THUNDERSTORM WATCH 455 IS IN EFFECT UNTIL 900 PM EDT FOR THE FOLLOWING LOCATIONS DE . DELAWARE COUNTIES INCLUDED ARE KENT NEW CASTLE SUSSEX
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 6:25 pm
...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... The Flash Flood Watch continues for * Portions of Delaware, northeast Maryland, New Jersey, and Pennsylvania, including the following areas, in Delaware, Kent and New Castle. In northeast Maryland, Caroline, Cecil, Kent
Author: w-nws.webmaster@noaa.gov
Posted: August 18, 2017, 4:19 pm