Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

May 15, 2012Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at May 15, 2012, 9:00 PM EDT for Berks County, Pennsylvania. It was in force for 90 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: May 15, 2012, 9:00 PM EDT (01:00 UTC)
Expired: May 15, 2012, 10:30 PM EDT
In force: 90 min
Issued by: NWS Philadelphia/Mount Holly

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 130 km from the middle of the area, began a volume at 01:02 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.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 1.0 hours before the alert went out and 201 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: 401 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1311 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

311 
WWUS81 KPHI 160100
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
900 PM EDT TUE MAY 15 2012

PAZ060-160230-
BERKS PA-
900 PM EDT TUE MAY 15 2012

...A STRONG THUNDERSTORM WILL AFFECT BERKS COUNTY...

AT 858 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 15 MILES NORTH OF LANCASTER...MOVING EAST AT 15
MPH. THE THUNDERSTORM WILL BE NEAR WERNERSVILLE AROUND 925 PM...
SINKING SPRING AROUND 935 PM...MOHNTON...WEST WYOMISSING...WHITFIELD
AROUND 940 PM...SHILLINGTON...WEST LAWN...WYOMISSING HILLS AROUND 945
PM...KENHORST AND WEST READING AROUND 950 PM.

WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.

EXPECT SMALL HAIL AND FREQUENT...DANGEROUS CLOUD TO GROUND LIGHTNING 
AND VERY HEAVY RAIN WHICH COULD CAUSE FLOODING ON ROADWAYS AND POOR 
DRAINAGE AREAS.

LAT...LON 4047 7578 4024 7569 4020 7577 4018 7595
      4034 7619

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 8:19 PM EDT	Special Weather Statement	PHI	Hunterdon, Warren	86 min
May 15, 8:46 PM EDT	Areal Flood Warning	PHI	Warren	76 min
May 15, 9:56 PM EDT	Special Weather Statement	PHI	Morris, Somerset	94 min
May 15, 10:48 PM EDT	Special Weather Statement	PHI	Somerset	57 min
May 16, 2:20 AM EDT	Special Weather Statement	PHI	Mercer	55 min
May 16, 10:36 AM EDT	Small Craft Advisory for Hazardous Seas	PHI		7 hr
May 15, 9:49 PM EDT	Special Weather Statement	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	86 min
May 15, 10:45 PM EDT	Areal Flood Advisory	PHI	Chester	57 min
May 15, 11:05 PM EDT	Special Weather Statement	PHI	Bucks, Chester, Delaware, Montgomery	55 min
May 15, 11:24 PM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	116 min
May 15, 11:38 PM EDT	Areal Flood Warning	PHI	Chester, Montgomery	4 hr
May 16, 12:12 AM EDT	Areal Flood Advisory	PHI	Chester, Delaware, Montgomery	3 hr
May 16, 12:20 AM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	55 min
May 16, 12:34 AM EDT	Flash Flood Warning	PHI	Chester, Delaware, Montgomery	4 hr
May 16, 2:37 AM EDT	Areal Flood Warning	PHI	Philadelphia	3 hr
May 16, 4:27 AM EDT	Areal Flood Warning	PHI	Delaware	3 hr

Nearby

Special Weather Statements in Pennsylvania, 2012 Every special weather statement in 2012

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.