Alert archive / Pennsylvania / Special Weather Statements in 2018

Special Weather Statement, NWS Philadelphia/Mount Holly

July 4, 2018Bucks County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 4, 2018, 6:13 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 32 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: Jul 4, 2018, 6:13 PM EDT (22:13 UTC)
Expired: Jul 4, 2018, 6:45 PM EDT
In force: 32 min
Issued by: NWS Philadelphia/Mount Holly

Counties Bucks County, PA, Montgomery County, PA

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.2 hours before the alert went out and 203 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: 145 J/kg
Mixed-layer CIN: -205 J/kg
Mixed-layer LCL: 1091 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

541 
WWUS81 KPHI 042213
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
613 PM EDT WED JUL 4 2018

PAZ103>106-042245-
Lower Bucks-Upper Bucks-Eastern Montgomery-Western Montgomery-
613 PM EDT WED JUL 4 2018

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL MONTGOMERY AND CENTRAL
BUCKS COUNTIES...

At 612 PM EDT, a rapidly developing thunderstorm was located near 
Chalfont, or 16 miles north of Philadelphia. The storm is nearly 
stationary. Other storms may develop in Bucks and Montgomery 
Counties during the next hour.

Winds up to 40 mph are possible with this storm.

Locations impacted include...
Lansdale, East Norriton, Doylestown, Hatboro, Souderton, Bedminster,
Ambler, Collegeville, Chalfont, Trappe, Hatfield, Dublin, Ivyland,
Fricks, Pipersville, Gardenville, Richboro, Willow Grove, Plymouth
Meeting and Horsham.

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

LAT...LON 4029 7491 4010 7520 4019 7549 4044 7516
TIME...MOT...LOC 2212Z 113DEG 2KT 4024 7521 

$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 9:35 AM EDT	Areal Flood Advisory	PHI	Sussex	100 min
Jul 4, 12:15 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
Jul 4, 12:53 PM EDT	Special Weather Statement	PHI	Sussex	22 min
Jul 4, 1:11 PM EDT	Special Weather Statement	PHI	Sussex	34 min
Jul 4, 1:22 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex	3 hr
Jul 4, 1:44 PM EDT	Special Weather Statement	PHI	Sussex	31 min
Jul 4, 1:48 PM EDT	Special Weather Statement	PHI	Warren	27 min
Jul 4, 1:57 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Warren	48 min
Jul 4, 2:02 PM EDT	Special Weather Statement	PHI	Sussex	28 min
Jul 4, 2:15 PM EDT	Areal Flood Advisory	PHI	Warren	3 hr
Jul 4, 2:18 PM EDT	Special Weather Statement	PHI	Warren	27 min
Jul 4, 2:31 PM EDT	Special Weather Statement	PHI	Warren	44 min
Jul 4, 2:48 PM EDT	Areal Flood Advisory	PHI	Morris	3 hr
Jul 4, 3:12 PM EDT	Special Weather Statement	PHI	Warren	33 min
Jul 4, 3:32 PM EDT	Special Weather Statement	PHI	Warren	28 min
Jul 4, 3:40 PM EDT	Severe Thunderstorm Warning	PHI	Warren	50 min
Jul 4, 3:59 PM EDT	Areal Flood Advisory	PHI	Warren	4 hr
Jul 4, 4:28 PM EDT	Areal Flood Advisory	PHI	Warren	4 hr
Jul 4, 9:33 AM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	98 min
Jul 4, 2:55 PM EDT	Special Weather Statement	PHI	Lehigh	35 min
Jul 4, 3:09 PM EDT	Areal Flood Advisory	PHI	Lehigh, Northampton	4 hr
Jul 4, 3:22 PM EDT	Flash Flood Warning	PHI	Lehigh, Northampton	4 hr
Jul 4, 3:56 PM EDT	Special Weather Statement	PHI	Lebanon	34 min
Jul 4, 4:20 PM EDT	Special Weather Statement	PHI	Carbon	25 min
Jul 4, 4:25 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh	4 hr
Jul 4, 4:28 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	32 min
Jul 4, 4:34 PM EDT	Special Weather Statement	PHI	Berks	56 min
Jul 4, 4:56 PM EDT	Special Weather Statement	PHI	Carbon	49 min
Jul 4, 5:46 PM EDT	Special Weather Statement	PHI	Berks	29 min
Jul 4, 6:15 PM EDT	Special Weather Statement	PHI	Berks	45 min
Jul 4, 6:20 PM EDT	Flash Flood Warning	PHI	Berks	4 hr
Jul 4, 6:32 PM EDT	Special Weather Statement	PHI	Chester	28 min
Jul 4, 7:00 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery, Philadelphia	30 min
Jul 4, 7:07 PM EDT	Special Weather Statement	PHI	Lebanon	23 min
Jul 4, 7:13 PM EDT	Areal Flood Advisory	PHI	Lehigh, Northampton	3 hr
Jul 4, 7:18 PM EDT	Areal Flood Advisory	PHI	Berks, Chester, Delaware, Montgomery, Philadelphia	3 hr
Jul 4, 7:32 PM EDT	Special Weather Statement	PHI	Montgomery	43 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.