Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

May 27, 2012Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at May 27, 2012, 4:35 AM 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: May 27, 2012, 4:35 AM EDT (08:35 UTC)
Expired: May 27, 2012, 5:30 AM EDT
In force: 55 min
Issued by: NWS Philadelphia/Mount Holly

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 115 km from the middle of the area, began a volume at 08:35 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, 8.6 hours before the alert went out and 211 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: 1975 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1005 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

066 
WWUS81 KPHI 270835
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
435 AM EDT SUN MAY 27 2012

PAZ060-067-068-270930-
BERKS PA-CHESTER PA-MONTGOMERY PA-
435 AM EDT SUN MAY 27 2012

...A STRONG THUNDERSTORM WILL AFFECT BERKS...CHESTER AND MONTGOMERY
COUNTIES...

AT 431 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 4 MILES NORTH OF READING...MOVING EAST AT 20 MPH.
THE THUNDERSTORM WILL BE NEAR ST. LAWRENCE...MOUNT PENN AROUND 445
AM...AMITY GARDENS...BIRDSBORO AROUND 500 AM...HALFWAY HOUSE...
GILBERTSVILLE AROUND 515 AM...POTTSGROVE AND SANATOGA AROUND 530 AM.

VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.

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

LAT...LON 4031 7541 4011 7551 4030 7609 4049 7598

$$

HAYES

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 4:58 AM EDT	Areal Flood Advisory	PHI	Burlington	83 min
May 27, 5:12 AM EDT	Special Weather Statement	PHI	Ocean	63 min
May 27, 5:36 AM EDT	Special Weather Statement	PHI	Ocean	54 min
May 27, 6:23 AM EDT	Special Weather Statement	PHI	Burlington, Ocean	67 min
May 27, 6:35 AM EDT	Areal Flood Advisory	PHI	Burlington, Ocean	91 min
May 27, 10:49 AM EDT	Special Weather Statement	PHI	Burlington	41 min
May 27, 3:01 PM EDT	Excessive Heat Warning	PHI	Burlington, Camden, Gloucester, Mercer	52 hr
May 27, 2:19 AM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh, Montgomery, Northampton	56 min
May 27, 2:54 AM EDT	Special Weather Statement	PHI	Bucks	66 min
May 27, 3:10 AM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Lehigh, Montgomery	3 hr
May 27, 3:35 AM EDT	Special Weather Statement	PHI	Berks	55 min
May 27, 3:46 AM EDT	Special Weather Statement	PHI	Bucks, Montgomery	59 min
May 27, 4:08 AM EDT	Flash Flood Warning	PHI	Bucks, Montgomery	4 hr
May 27, 4:46 AM EDT	Special Weather Statement	PHI	Philadelphia	59 min
May 27, 5:08 AM EDT	Areal Flood Advisory	PHI	Berks	89 min
May 27, 5:18 AM EDT	Special Weather Statement	PHI	Berks	57 min
May 27, 5:47 AM EDT	Special Weather Statement	PHI	Berks	58 min
May 27, 5:57 AM EDT	Flash Flood Warning	PHI	Bucks, Montgomery, Philadelphia	2 hr
May 27, 8:48 AM EDT	Special Weather Statement	PHI	Montgomery	42 min
May 27, 9:26 AM EDT	Special Weather Statement	PHI	Bucks, Lehigh	49 min
May 27, 10:07 AM EDT	Areal Flood Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Philadelphia	3 hr
May 27, 4:56 PM EDT	Special Weather Statement	PHI	Berks	49 min
May 27, 5:51 PM EDT	Areal Flood Warning	PHI	Montgomery	95 min
May 27, 7:36 PM EDT	Special Weather Statement	PHI	Monroe	39 min
May 27, 7:45 PM EDT	Special Weather Statement	PHI	Berks	45 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.