Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

May 29, 2012Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at May 29, 2012, 7:44 PM EDT for Bucks County, Pennsylvania. It was in force for 61 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 29, 2012, 7:44 PM EDT (23:44 UTC)
Expired: May 29, 2012, 8:45 PM EDT
In force: 61 min
Issued by: NWS Philadelphia/Mount Holly

County Bucks County, PA

The radar

The Philadelphia radar (KDIX), 62 km from the middle of the area, began a volume at 23:46 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 11.7 hours before the alert went out and 117 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: 667 J/kg
Mixed-layer CIN: -217 J/kg
Mixed-layer LCL: 1153 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -39 m²/s²
0-3 km storm-relative helicity: -10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

955 
WWUS81 KPHI 292344
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
744 PM EDT TUE MAY 29 2012

PAZ068-069-300045-
BUCKS PA-MONTGOMERY PA-
744 PM EDT TUE MAY 29 2012

...STRONG THUNDERSTORMS WILL AFFECT BUCKS AND MONTGOMERY COUNTIES...

AT 742 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 20 MILES SOUTHEAST
OF EASTON TO 9 MILES NORTHWEST OF PHILADELPHIA TO 9 MILES NORTHWEST
OF WILMINGTON...MOVING SOUTHEAST AT 20 MPH. THE THUNDERSTORMS WILL BE
NEAR ABINGTON...WYNDMOOR AROUND 800 PM...BENSALEM...WOODBOURNE AROUND
815 PM...ANDALUSIA AND YARDLEY AROUND 830 PM.

WIND GUSTS TO 40 TO 50 MPH ARE POSSIBLE WITH THESE STORMS.

IF YUOU SEE THREATENING WEATHER, SEEK SHELTER IMMEDIATELY.

LAT...LON 4005 7497 4005 7498 4009 7495 4012 7496
      4013 7502 4005 7510 4009 7522 4005 7526
      4001 7521 3998 7527 4007 7537 4007 7540
      4055 7511 4053 7506 4042 7506 4039 7496
      4034 7495 4016 7472

$$
 
TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 3:27 AM EDT	Small Craft Advisory	PHI		21 hr
May 29, 6:22 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	53 min
May 29, 6:32 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	66 min
May 29, 6:46 PM EDT	Special Weather Statement	PHI	Hunterdon, Mercer, Somerset	89 min
May 29, 6:51 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	114 min
May 29, 6:52 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	53 min
May 29, 7:21 PM EDT	Areal Flood Warning	PHI	Sussex	2 hr
May 29, 7:34 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 2 more	56 min
May 29, 12:29 PM EDT	Flash Flood Watch	PHI	Berks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more	8 hr
May 29, 1:36 PM EDT	Special Weather Statement	PHI	Monroe	54 min
May 29, 1:50 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	115 min
May 29, 5:06 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	114 min
May 29, 5:25 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh	95 min
May 29, 5:45 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	75 min
May 29, 6:14 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Northampton	91 min
May 29, 6:23 PM EDT	Flash Flood Warning	PHI	Carbon, Monroe	112 min
May 29, 6:44 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Lehigh, Montgomery	3 hr
May 29, 7:35 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	115 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.