Alert archive / Pennsylvania / Special Weather Statements in 2014

Special Weather Statement, NWS Philadelphia/Mount Holly

May 10, 2014Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at May 10, 2014, 2:55 PM EDT for Delaware County, Pennsylvania. It was in force for 65 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 10, 2014, 2:55 PM EDT (18:55 UTC)
Expired: May 10, 2014, 4:00 PM EDT
In force: 65 min
Issued by: NWS Philadelphia/Mount Holly

County Delaware County, PA

What was reported inside it

Time	Report	Where	Remark
May 10, 3:20 PM EDT	HAIL 0.25	Drexel Hill, PA
May 10, 3:25 PM EDT	TSTM WND GST 50	Lansdowne, PA	THUNDERSTORM WIND GUST OF 40 TO 50 MPH REPORTED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.9 hours before the alert went out and 187 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: 111 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 1281 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 24 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.

091 
WWUS81 KPHI 101855
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
255 PM EDT SAT MAY 10 2014

DEZ001-PAZ070-101-102-102000-
DELAWARE PA-EASTERN CHESTER PA-NEW CASTLE DE-WESTERN CHESTER PA-
255 PM EDT SAT MAY 10 2014

...STRONG THUNDERSTORMS WILL AFFECT DELAWARE...NORTHERN NEW CASTLE
AND SOUTHERN CHESTER COUNTIES...

AN AREA OF STRONG THUNDERSTORMS COVERED PORTIONS OF CHESTER COUNTY.  
THESE STORMS WILL MOVE INTO DELAWARE AND NEW CASTLE COUNTIES BY 400 PM 
EDT. THE STRONG THUNDERSTORMS WERE GENERALLY MOVING EAST AT 25 MPH.

WIND GUSTS TO 40 MPH AND SMALL HAIL AND VERY HEAVY RAIN ARE POSSIBLE 
WITH THESE STRONG THUNDERSTORMS. 

LAT...LON 3988 7599 3991 7600 4004 7534 3996 7526
      3990 7525 3988 7526 3987 7524 3987 7535
      3983 7537 3977 7545 3972 7601 3983 7604

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 9:20 PM EDT	Dense Fog Advisory	PHI	Atlantic, Burlington, Cape May, Monmouth, Ocean	6 hr
May 10, 1:37 PM EDT	Special Weather Statement	PHI	Sussex	53 min
May 10, 2:07 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Somerset	38 min
May 10, 2:35 PM EDT	Special Weather Statement	PHI	Middlesex	40 min
May 10, 3:14 PM EDT	Special Weather Statement	PHI	Burlington, Camden	61 min
May 10, 3:29 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	61 min
May 10, 4:05 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	55 min
May 10, 4:11 PM EDT	Special Weather Statement	PHI	Morris	34 min
May 10, 4:24 PM EDT	Special Weather Statement	PHI	Hunterdon	51 min
May 10, 4:43 PM EDT	Special Marine Warning	PHI		62 min
May 10, 4:45 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset	45 min
May 10, 2:22 PM EDT	Special Weather Statement	PHI	Cecil	53 min

Nearby

Special Weather Statements in Pennsylvania, 2014 Every special weather statement in 2014

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.