Alert archive / Pennsylvania / Special Weather Statements in 2018

Special Weather Statement, NWS Philadelphia/Mount Holly

August 3, 2018Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 3, 2018, 3:42 PM EDT for Lehigh County, Northampton County, Pennsylvania. It was in force for 63 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 3, 2018, 3:42 PM EDT (19:42 UTC)
Expired: Aug 3, 2018, 4:45 PM EDT
In force: 63 min
Issued by: NWS Philadelphia/Mount Holly

Counties Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 139 km from the middle of the area, began a volume at 19:43 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, 7.7 hours before the alert went out and 239 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 355 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 542 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

777 
WWUS81 KPHI 031942
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
342 PM EDT FRI AUG 3 2018

PAZ054-055-060>062-032045-
Lehigh-Monroe-Northampton-Berks-Carbon-
342 PM EDT FRI AUG 3 2018

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN BERKS...LEHIGH...
SOUTHEASTERN CARBON...SOUTHWESTERN MONROE AND SOUTHWESTERN
NORTHAMPTON COUNTIES...

At 342 PM EDT, a strong thunderstorm was located over Kutztown, or 15
miles west of Allentown, moving northeast at 25 mph.

Winds up to 40 mph are possible with this storm.

Locations impacted include...
Allentown, Easton, Bethlehem, Emmaus, Northampton, Wilson, Nazareth,
Palmerton, Kutztown, Hamburg, Slatington, Fleetwood, Bath,
Walnutport, Topton, West Easton, Steuben, Lyons, Glendon and
Lenhartsville.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 4069 7586 4070 7583 4074 7576 4075 7578
      4094 7557 4067 7519 4040 7578 4056 7601
TIME...MOT...LOC 1942Z 232DEG 21KT 4055 7576 

$$

Meola

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 2, 9:35 PM EDT	Special Weather Statement	PHI	Somerset	25 min
Aug 2, 10:05 PM EDT	Special Weather Statement	PHI	Morris, Somerset	55 min
Aug 3, 11:47 AM EDT	Special Marine Warning	PHI		88 min
Aug 3, 12:17 PM EDT	Special Weather Statement	PHI	Cape May	43 min
Aug 3, 12:37 PM EDT	Special Weather Statement	PHI	Camden, Gloucester	38 min
Aug 3, 12:52 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	21 min
Aug 3, 1:01 PM EDT	Special Weather Statement	PHI	Hunterdon	44 min
Aug 3, 1:14 PM EDT	Special Weather Statement	PHI	Mercer	46 min
Aug 3, 1:27 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	48 min
Aug 3, 1:42 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Sussex, Warren	63 min
Aug 3, 2:00 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Somerset	30 min
Aug 3, 2:37 PM EDT	Special Weather Statement	PHI	Morris, Sussex	38 min
Aug 3, 2:54 PM EDT	Special Marine Warning	PHI		20 min
Aug 3, 3:33 PM EDT	Special Weather Statement	PHI	Camden, Gloucester, Salem	57 min
Aug 3, 4:31 PM EDT	Special Weather Statement	PHI	Salem	59 min
Aug 3, 4:45 PM EDT	Special Weather Statement	PHI	Warren	60 min
Aug 3, 5:25 PM EDT	Special Weather Statement	PHI	Monmouth, Ocean	50 min
Aug 3, 5:27 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Gloucester	63 min
Aug 3, 6:52 PM EDT	Special Weather Statement	PHI	Sussex, Warren	113 min
Aug 3, 7:56 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	4 hr
Aug 3, 5:45 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery, Philadelphia	60 min
Aug 3, 7:37 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh	4 hr
Aug 3, 3:29 PM EDT	Special Weather Statement	PHI	Sussex	46 min

Nearby

Special Weather Statements in Pennsylvania, 2018 Every special weather statement 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.