Alert archive / Pennsylvania / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

June 4, 2021Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jun 4, 2021, 1:02 PM EDT for Lehigh County, Pennsylvania. It was in force for 28 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 4, 2021, 1:02 PM EDT (17:02 UTC)
Expired: Jun 4, 2021, 1:30 PM EDT
In force: 28 min
Issued by: NWS Philadelphia/Mount Holly

County Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 145 km from the middle of the area, began a volume at 17:02 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 4, 1:30 PM EDT	TSTM WND DMG	3 W Weisenberg Twp, PA	TREE DOWN ON WIRES ON STAGECOACH 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, 5.0 hours before the alert went out and 217 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: 381 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 947 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

086 
WWUS81 KPHI 041702
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
102 PM EDT Fri Jun 4 2021

PAZ060-061-041730-
Lehigh-Berks-
102 PM EDT Fri Jun 4 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN BERKS AND CENTRAL
LEHIGH COUNTIES...

At 101 PM EDT, a strong thunderstorm was located over Lenhartsville,
or 14 miles north of Reading, moving east at 30 mph.

Wind gusts up to 50 mph and pea size hail are possible with this
storm.

Locations impacted include...
Allentown, Emmaus, Kutztown, Hamburg, Fleetwood, Topton,
Shoemakersville, Bally, Lyons, Strausstown, Lenhartsville,
Wanamakers, Zionsville, Ancient Oaks, Claussville, Macungie,
Alburtis, Centerport and Fullerton.

This includes the following highways...
 Northeast Extension between mile markers 49 and 60.
 Interstate 78 in Pennsylvania between mile markers 18 and 58.

If outdoors, consider seeking shelter inside a building.

LAT...LON 4052 7625 4054 7617 4057 7608 4058 7606
      4057 7602 4063 7600 4069 7587 4062 7548
      4042 7548 4045 7553 4040 7557 4051 7637
TIME...MOT...LOC 1701Z 275DEG 25KT 4054 7590 

$$

Davis

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 3, 8:14 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth, Ocean	19 min
Jun 3, 8:44 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth	30 min
Jun 3, 8:55 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	10 min
Jun 4, 1:07 PM EDT	Special Weather Statement	PHI	Sussex	38 min
Jun 4, 1:45 PM EDT	Areal Flood Advisory	PHI	Warren	97 min
Jun 4, 1:49 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	41 min
Jun 4, 2:43 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren	62 min
Jun 4, 2:49 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren	70 min
Jun 4, 3:16 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Hunterdon, Mercer, Middlesex, Monmouth and 1 more	98 min
Jun 4, 3:18 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer	42 min
Jun 4, 3:23 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	67 min
Jun 4, 3:46 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Mercer	44 min
Jun 4, 4:12 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	63 min
Jun 4, 4:20 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	40 min
Jun 4, 4:22 PM EDT	Special Marine Warning	PHI		53 min
Jun 4, 4:23 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	52 min
Jun 4, 4:30 PM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth, Ocean	63 min
Jun 4, 5:09 PM EDT	Special Marine Warning	PHI		2 hr
Jun 4, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	18 min
Jun 4, 5:32 PM EDT	Special Marine Warning	PHI		58 min
Jun 4, 6:18 PM EDT	Special Weather Statement	PHI	Atlantic	42 min
Jun 4, 6:27 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	48 min
Jun 4, 7:13 PM EDT	Special Marine Warning	PHI		62 min
Jun 4, 1:29 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh	2 hr
Jun 4, 2:21 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery	21 min
Jun 4, 2:24 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	51 min
Jun 4, 2:27 PM EDT	Severe Thunderstorm Warning	PHI	Berks	48 min
Jun 4, 3:14 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	46 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.