Alert archive / Pennsylvania / Special Weather Statements in 2016

Special Weather Statement, NWS Philadelphia/Mount Holly

April 26, 2016Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Apr 26, 2016, 5:38 PM EDT for Chester County, Pennsylvania. It was in force for 22 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: Apr 26, 2016, 5:38 PM EDT (21:38 UTC)
Expired: Apr 26, 2016, 6:00 PM EDT
In force: 22 min
Issued by: NWS Philadelphia/Mount Holly

County Chester County, PA

The radar

The Philadelphia radar (KDIX), 121 km from the middle of the area, began a volume at 21:42 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, 9.6 hours before the alert went out and 66 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: 25 J/kg
Mixed-layer CIN: -252 J/kg
Mixed-layer LCL: 1659 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 177 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

160 
WWUS81 KPHI 262138
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
538 PM EDT TUE APR 26 2016
 
PAZ101-102-262200-
WESTERN CHESTER-EASTERN CHESTER-
538 PM EDT TUE APR 26 2016

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL CHESTER COUNTY...

AT 537 PM EDT...A STRONG THUNDERSTORM WAS NEAR HONEY BROOK...OR NEAR
NEW HOLLAND...MOVING SOUTHEAST AT 30 MPH.

WIND GUSTS UP TO 50 MPH AND HALF INCH HAIL ARE POSSIBLE WITH THIS
STORM. LIGHTNING AND HEAVY DOWNPOURS WILL LIKELY OCCUR WITH STORM AS
WELL. 

THIS STORM WILL BE NEAR...
  HONEY BROOK AROUND 540 PM EDT. 
  PARKESBURG AROUND 550 PM EDT. 
  COATESVILLE AND GLENMOORE AROUND 555 PM EDT. 
  DOWNINGTOWN AND MARSHALLTON AROUND 600 PM EDT. 

OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE MODENA...THORNDALE...
EXTON...SOUTH COATESVILLE...WEST GOSHEN...MALVERN...ATGLEN AND
CHESTERBROOK.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FOR
SOUTHEASTERN PENNSYLVANIA.

LAT...LON 4004 7593 4011 7594 4013 7586 4008 7547
      3982 7568 3996 7599
TIME...MOT...LOC 2137Z 292DEG 25KT 4007 7598 
$$

MWG

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 12:34 AM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester, Salem	41 min
Apr 26, 12:54 AM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean	66 min
Apr 26, 12:56 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester	49 min
Apr 26, 1:22 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Ocean	42 min
Apr 26, 1:58 AM EDT	Special Weather Statement	PHI	Warren	47 min
Apr 26, 2:04 AM EDT	Special Weather Statement	PHI	Ocean	41 min
Apr 26, 2:25 AM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Warren	35 min
Apr 26, 2:45 AM EDT	Special Weather Statement	PHI	Mercer, Middlesex, Somerset	60 min
Apr 26, 3:00 AM EDT	Special Weather Statement	PHI	Morris, Somerset	45 min
Apr 26, 3:17 AM EDT	Special Weather Statement	PHI	Monmouth	43 min
Apr 26, 3:32 AM EDT	Special Marine Warning	PHI		58 min
Apr 26, 3:36 PM EDT	Special Weather Statement	PHI	Burlington, Camden	24 min
Apr 26, 3:44 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	31 min
Apr 26, 4:07 PM EDT	Special Weather Statement	PHI	Ocean	23 min
Apr 26, 4:23 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	26 min
Apr 26, 4:25 PM EDT	Special Marine Warning	PHI		35 min
Apr 26, 5:42 PM EDT	Special Weather Statement	PHI	Mercer	33 min
Apr 26, 5:47 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth, Ocean	28 min
Apr 26, 6:37 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Gloucester	38 min
Apr 26, 5:49 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	41 min

Nearby

Special Weather Statements in Pennsylvania, 2016 Every special weather statement in 2016

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.