Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

August 9, 2012Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 9, 2012, 10:05 PM EDT for Berks County, Pennsylvania. It was in force for 55 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: Aug 9, 2012, 10:05 PM EDT (02:05 UTC)
Expired: Aug 9, 2012, 11:00 PM EDT
In force: 55 min
Issued by: NWS Philadelphia/Mount Holly

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 146 km from the middle of the area, began a volume at 02:07 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, 2.1 hours before the alert went out and 195 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: 349 J/kg
Mixed-layer CIN: -144 J/kg
Mixed-layer LCL: 1386 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

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

409 
WWUS81 KPHI 100205
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1005 PM EDT THU AUG 9 2012

PAZ060-100300-
BERKS PA-
1005 PM EDT THU AUG 9 2012

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

AT 1003 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 13 MILES WEST OF READING...MOVING NORTHEAST AT 15
MPH. THE THUNDERSTORM WILL BE NEAR WOMELSDORF AROUND 1015 PM...
SINKING SPRING...WERNERSVILLE AROUND 1030 PM...WHITFIELD...WYOMISSING
HILLS AROUND 1045 PM...WEST READING AND LAURELDALE AROUND 1100 PM.

VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL POOR DRAINAGE AREAS.

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

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. DO
NOT SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS
WHEN A THUNDERSTORM APPROACHES.

LAT...LON 4051 7596 4029 7570 4019 7597 4029 7613
      4036 7621 4036 7622 4036 7623

$$

FORECASTER: HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 10:51 PM EDT	Special Weather Statement	PHI	Sussex	54 min
Aug 10, 4:00 AM EDT	Small Craft Advisory	PHI		50 hr
Aug 10, 8:41 AM EDT	Special Weather Statement	PHI	Gloucester, Hunterdon, Salem, Sussex, Warren	94 min
Aug 10, 8:43 AM EDT	Special Weather Statement	PHI	Gloucester, Hunterdon, Salem, Sussex, Warren	92 min
Aug 10, 9:08 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Cumberland, Gloucester, Hunterdon, Mercer and 5 more	3 hr
Aug 10, 10:05 AM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	115 min
Aug 10, 10:19 AM EDT	Special Marine Warning	PHI		86 min
Aug 10, 10:33 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 8 more	4 hr
Aug 10, 10:51 AM EDT	Special Marine Warning	PHI		84 min
Aug 10, 10:58 AM EDT	Special Marine Warning	PHI		62 min
Aug 10, 11:41 AM EDT	Special Marine Warning	PHI		2 hr
Aug 10, 12:10 PM EDT	Special Weather Statement	PHI	Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Morris and 2 more	80 min
Aug 9, 8:24 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	66 min
Aug 9, 9:24 PM EDT	Special Weather Statement	PHI	Monroe	96 min
Aug 9, 10:09 PM EDT	Areal Flood Advisory	PHI	Monroe	98 min
Aug 9, 10:25 PM EDT	Flash Flood Warning	PHI	Monroe	83 min
Aug 10, 7:40 AM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Chester, Lehigh, Monroe, Montgomery and 1 more	3 hr
Aug 10, 8:55 AM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	65 min
Aug 10, 10:14 AM EDT	Severe Thunderstorm Warning	PHI	Sussex	61 min

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.