Alert archive / Pennsylvania / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

June 8, 2021Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jun 8, 2021, 2:43 PM EDT for Montgomery County, Pennsylvania. It was in force for 32 min. 1 report 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: Jun 8, 2021, 2:43 PM EDT (18:43 UTC)
Expired: Jun 8, 2021, 3:15 PM EDT
In force: 32 min
Issued by: NWS Philadelphia/Mount Holly

County Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 109 km from the middle of the area, began a volume at 18:47 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.

What was reported inside it

Time	Report	Where	Remark
Jun 8, 3:00 PM EDT	TSTM WND DMG	1 Se Vera Cruz, PA	TREE DOWN IN WIRES ON BEVERLY HILLS RD AT CHURCH VIEW RD. 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, 6.7 hours before the alert went out and 222 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: 254 J/kg
Mixed-layer CIN: -121 J/kg
Mixed-layer LCL: 1088 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -39 m²/s²
0-3 km storm-relative helicity: 23 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

873 
WWUS81 KPHI 081843
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
243 PM EDT Tue Jun 8 2021

PAZ060>062-101-103-105-081915-
Upper Bucks-Lehigh-Western Montgomery-Western
Chester-Northampton-Berks-
243 PM EDT Tue Jun 8 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN BERKS...
SOUTHEASTERN LEHIGH...NORTHWESTERN MONTGOMERY...NORTHWESTERN BUCKS...
NORTHEASTERN CHESTER AND SOUTH CENTRAL NORTHAMPTON COUNTIES...

At 243 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Emmaus to near Bally to near
Birdsboro. Movement was southeast at 20 mph.

Wind gusts up to 45 mph and half inch hail are possible with these 
storms.

Locations impacted include...
Allentown, Bethlehem, Pottstown, Phoenixville, Emmaus, Quakertown,
Perkasie, Souderton, Hellertown, Birdsboro, Collegeville, Royersford,
Trappe, East Greenville, Topton, Ferndale, Schwenksville, Elverson,
Bally and Bechtelsville.

This includes the following highways...
 Pennsylvania Turnpike near mile marker 296, between mile markers 299
and 306, and between mile markers 314 and 319.
 Northeast Extension between mile markers 31 and 55.
 Interstate 78 in Pennsylvania between mile markers 56 and 65.
 Interstate 176 in Pennsylvania between mile markers 1 and 5.

If outdoors, consider seeking shelter inside a building.

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

LAT...LON 4054 7571 4060 7543 4055 7508 4007 7553
      4005 7560 4018 7594
TIME...MOT...LOC 1843Z 293DEG 17KT 4054 7543 4044 7563 4022 7581 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 1:27 PM EDT	Areal Flood Advisory	PHI	Warren	3 hr
Jun 8, 1:49 PM EDT	Special Weather Statement	PHI	Warren	26 min
Jun 8, 1:54 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex	95 min
Jun 8, 2:19 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer	2 hr
Jun 8, 2:29 PM EDT	Special Weather Statement	PHI	Morris	16 min
Jun 8, 2:48 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Somerset	27 min
Jun 8, 3:13 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	32 min
Jun 8, 3:14 PM EDT	Areal Flood Advisory	PHI	Middlesex, Somerset	74 min
Jun 8, 4:12 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	48 min
Jun 8, 4:14 PM EDT	Special Marine Warning	PHI		91 min
Jun 8, 4:44 PM EDT	Special Weather Statement	PHI	Salem	31 min
Jun 8, 4:47 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	43 min
Jun 8, 4:54 PM EDT	Special Marine Warning	PHI		96 min
Jun 8, 4:56 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Gloucester	49 min
Jun 8, 4:58 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	47 min
Jun 8, 5:30 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	45 min
Jun 8, 5:43 PM EDT	Special Weather Statement	PHI	Ocean	32 min
Jun 8, 6:01 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	44 min
Jun 8, 6:22 PM EDT	Special Marine Warning	PHI		83 min
Jun 8, 7:39 PM EDT	Special Marine Warning	PHI		66 min
Jun 8, 7:52 PM EDT	Special Weather Statement	PHI	Cape May	38 min
Jun 8, 11:54 AM EDT	Areal Flood Advisory	PHI	Monroe	2 hr
Jun 8, 12:34 PM EDT	Flash Flood Warning	PHI	Monroe	2 hr
Jun 8, 12:40 PM EDT	Special Weather Statement	PHI	Monroe	35 min
Jun 8, 1:09 PM EDT	Special Weather Statement	PHI	Monroe	21 min
Jun 8, 1:17 PM EDT	Special Weather Statement	PHI	Chester	13 min
Jun 8, 1:18 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware, Montgomery, Philadelphia	3 hr
Jun 8, 1:24 PM EDT	Special Weather Statement	PHI	Delaware	21 min
Jun 8, 1:35 PM EDT	Flash Flood Warning	PHI	Chester, Delaware, Montgomery	5 hr
Jun 8, 2:07 PM EDT	Special Weather Statement	PHI	Bucks	23 min
Jun 8, 3:15 PM EDT	Special Weather Statement	PHI	Chester	30 min
Jun 8, 3:21 PM EDT	Flash Flood Warning	PHI	Chester, Montgomery	3 hr
Jun 8, 3:43 PM EDT	Special Weather Statement	PHI	Chester	32 min
Jun 8, 4:20 PM EDT	Special Weather Statement	PHI	Chester	25 min
Jun 8, 4:25 PM EDT	River Flood Warning	PHI	Chester	11 hr
Jun 8, 6:21 PM EDT	Areal Flood Warning	PHI	Chester, Delaware	15 hr
Jun 8, 7:14 PM EDT	River Flood Warning	PHI	Chester, Delaware	18 hr
Jun 8, 7:43 PM EDT	Special Weather Statement	PHI	Sussex	32 min

Nearby

Special Weather Statements in Pennsylvania, 2021 Every special weather statement in 2021

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; radar from the NEXRAD Level II archive.