Alert archive / Pennsylvania / Special Weather Statements in 2018

Special Weather Statement, NWS Philadelphia/Mount Holly

July 3, 2018Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 3, 2018, 6:21 PM EDT for Delaware County, Pennsylvania. It was in force for 24 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 3, 2018, 6:21 PM EDT (22:21 UTC)
Expired: Jul 3, 2018, 6:45 PM EDT
In force: 24 min
Issued by: NWS Philadelphia/Mount Holly

County Delaware County, PA

What was reported inside it

Time	Report	Where	Remark
Jul 3, 6:40 PM EDT	TSTM WND DMG	Spruce Hill, PA	REPORT OF TREE DOWN BLOCKING LARCHWOOD AVENUE. TIME ESTIMATED FROM RADAR
Jul 3, 6:40 PM EDT	TSTM WND DMG	Spruce Hill, PA	REPORT OF TREE DOWN BLOCKING S 44TH STREET. TIME ESTIMATED FROM RADAR

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.4 hours before the alert went out and 213 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: 574 J/kg
Mixed-layer CIN: -189 J/kg
Mixed-layer LCL: 1257 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

502 
WWUS81 KPHI 032221
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
621 PM EDT TUE JUL 3 2018

PAZ070-071-102-104-032245-
Eastern Montgomery-Delaware-Eastern Chester-Philadelphia-
621 PM EDT TUE JUL 3 2018

...A STRONG THUNDERSTORM WILL AFFECT SOUTH CENTRAL MONTGOMERY...WEST
CENTRAL PHILADELPHIA AND NORTHEASTERN DELAWARE COUNTIES...

At 621 PM EDT, a strong thunderstorm was located over Bryn Mawr, or
10 miles west of Philadelphia. The storm is nearly stationary.

Winds up to 40 mph and pea size hail are possible with this storm.

Locations impacted include...
Philadelphia, Norristown, Yeadon, Conshohocken, Narberth, East
Lansdowne, Morris Park, Center City, Bryn Mawr, Trout Lake, Radnor
Township, Broomall, Plymouth Meeting, Newtown Square, Roxborough,
Drexel Hill, Darby Township, King Of Prussia, Darby and Lansdowne.

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

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4001 7547 4013 7530 3998 7514 3990 7527
TIME...MOT...LOC 2221Z 318DEG 1KT 4002 7533 

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 2:33 PM EDT	Special Weather Statement	PHI	Union	27 min
Jul 3, 2:57 PM EDT	Special Weather Statement	PHI	Morris	63 min
Jul 3, 3:19 PM EDT	Flash Flood Warning	PHI	Morris	3 hr
Jul 3, 3:28 PM EDT	Special Weather Statement	PHI	Salem	62 min
Jul 3, 3:30 PM EDT	Special Weather Statement	PHI	Burlington	60 min
Jul 3, 3:43 PM EDT	Flash Flood Warning	PHI	Morris	2 hr
Jul 3, 4:49 PM EDT	Special Weather Statement	PHI	Somerset	56 min
Jul 3, 4:52 PM EDT	Special Weather Statement	PHI	Mercer	53 min
Jul 3, 4:57 PM EDT	Flash Flood Warning	PHI	Hunterdon, Somerset	114 min
Jul 3, 5:24 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	4 hr
Jul 3, 5:29 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	4 hr
Jul 3, 5:45 PM EDT	Flash Flood Warning	PHI	Camden, Gloucester	4 hr
Jul 3, 5:47 PM EDT	Flash Flood Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	2 hr
Jul 3, 5:57 PM EDT	Special Weather Statement	PHI	Gloucester	33 min
Jul 3, 6:03 PM EDT	Special Weather Statement	PHI	Sussex	57 min
Jul 3, 6:11 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	49 min
Jul 3, 6:25 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	50 min
Jul 3, 6:37 PM EDT	Flash Flood Warning	PHI	Burlington, Camden	3 hr
Jul 3, 6:46 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	44 min
Jul 3, 6:58 PM EDT	Flash Flood Warning	PHI	Burlington, Camden, Gloucester	49 min
Jul 3, 7:03 PM EDT	Special Weather Statement	PHI	Warren	57 min
Jul 3, 2:15 PM EDT	Special Weather Statement	PHI	Delaware	30 min
Jul 3, 3:00 PM EDT	Special Weather Statement	PHI	Philadelphia	60 min
Jul 3, 3:11 PM EDT	Flash Flood Warning	PHI	Montgomery, Philadelphia	50 min
Jul 3, 4:06 PM EDT	Special Weather Statement	PHI	Montgomery	54 min
Jul 3, 4:30 PM EDT	Special Weather Statement	PHI	Bucks	60 min
Jul 3, 5:30 PM EDT	Special Weather Statement	PHI	Philadelphia	30 min
Jul 3, 6:15 PM EDT	Special Weather Statement	PHI	Chester	60 min
Jul 3, 6:18 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Philadelphia	42 min
Jul 3, 6:40 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware	4 hr
Jul 3, 6:50 PM EDT	Special Weather Statement	PHI	Delaware	55 min
Jul 3, 6:54 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	51 min
Jul 3, 6:58 PM EDT	Flash Flood Warning	PHI	Chester, Delaware	4 hr
Jul 3, 7:06 PM EDT	Flash Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	2 hr
Jul 3, 7:22 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	21 min
Jul 3, 7:35 PM EDT	Special Weather Statement	PHI	Chester	25 min
Jul 3, 7:39 PM EDT	Severe Thunderstorm Warning	PHI	Chester	51 min
Jul 3, 7:54 PM EDT	Flash Flood Warning	PHI	Chester	4 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.