Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

May 27, 2012Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at May 27, 2012, 4:46 AM EDT for Philadelphia County, Pennsylvania. It was in force for 59 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, 4:46 AM EDT (08:46 UTC)
Expired: May 27, 2012, 5:45 AM EDT
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly

County Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 47 km from the middle of the area, began a volume at 08:48 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

Brookhaven, NY (KOKX), launched 00:00Z, 8.8 hours before the alert went out and 190 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: 1225 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 871 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

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

667 
WWUS81 KPHI 270846
SPSPHI

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

NJZ019-PAZ068-069-071-270945-
BUCKS PA-MONTGOMERY PA-NORTHWESTERN BURLINGTON NJ-PHILADELPHIA PA-
446 AM EDT SUN MAY 27 2012

...A CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT BUCKS... 
BURLINGTON...MONTGOMERY AND PHILADELPHIA COUNTIES...

AT 444 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
CLUSTER OF STRONG THUNDERSTORMS 13 MILES NORTH OF PHILADELPHIA... 
MOVING EAST AT 15 MPH. THE THUNDERSTORMS WILL BE NEAR HORSHAM... 
ORELAND AROUND 500 AM...HATBORO...WARMINSTER HEIGHTS AROUND 515 
AM...FEASTERVILLE...CHURCHVILLE AROUND 530 AM...LANGHORNE MANOR AND 
PENNDEL AROUND 545 AM.

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

THE STORMS MAY ALSO PRODUCE SMALL HAIL.

LAT...LON 3997 7474 4004 7535 4030 7532 4023 7480
      4021 7477 4019 7476 4016 7472

$$

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, 4:35 AM EDT	Special Weather Statement	PHI	Berks	55 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.