Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 85, NWS Philadelphia/Mount Holly

July 3, 2014New Castle County, Delaware; Cecil County, Maryland; Chester County, Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 3, 2014, 6:21 PM EDT for New Castle County, Delaware; Cecil County, Maryland; Chester County, Delaware County, Pennsylvania. It was in force for 39 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: Jul 3, 2014, 6:21 PM EDT (22:21 UTC)
Expired: Jul 3, 2014, 7:00 PM EDT
In force: 39 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Cecil County, MD, Chester County, PA, Delaware County, PA

The radar

The Philadelphia radar (KDIX), 91 km from the middle of the area, began a volume at 22:23 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.

What was reported inside it

Time	Report	Where	Remark
Jul 3, 6:30 PM EDT	TSTM WND DMG	Kennett Square, PA	TREES AND WIRES DOWN.
Jul 3, 6:59 PM EDT	TSTM WND GST 54	Philadelphia Intl Airpo, PA

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 3, 2:12 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.4 hours before the alert went out and 75 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: 704 J/kg
Mixed-layer CIN: -85 J/kg
Mixed-layer LCL: 954 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

450 
WUUS51 KPHI 032221
SVRPHI
DEC003-MDC015-PAC029-045-032300-
/O.NEW.KPHI.SV.W.0085.140703T2221Z-140703T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
621 PM EDT THU JUL 3 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  NORTHEASTERN CECIL COUNTY IN NORTHEAST MARYLAND...
  EASTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 700 PM EDT

* AT 619 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR KEMBLESVILLE...MOVING
  NORTHEAST AT 45 MPH. THIS STORM IS CAPABLE OF PRODUCING DAMAGING
  WINDS IN EXCESS OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  KENNETT SQUARE AND ASHLAND AROUND 630 PM EDT...
  ELAM AND TALLEYVILLE AROUND 640 PM EDT...
  CHEYNEY AND WESTTOWN AROUND 645 PM EDT...
  GRADYVILLE AND LIMA AROUND 650 PM EDT...
  NEWTOWN SQUARE AND BROOMALL AROUND 655 PM EDT...
  DREXEL HILL AROUND 700 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO A
STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DO
SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THE
NATIONAL WEATHER SERVICE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
THURSDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4001 7579 4016 7551 4013 7551 4012 7547
      4010 7546 3990 7525 3988 7526 3987 7522
      3985 7528 3985 7534 3979 7541 3963 7586
TIME...MOT...LOC 2221Z 234DEG 38KT 3977 7582

$$

FORECASTER: AMC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 8:08 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	52 min
Jul 2, 10:24 PM EDT	Special Weather Statement	PHI	New Castle	36 min
Jul 2, 11:47 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	58 min
Jul 3, 12:04 AM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	56 min
Jul 3, 12:34 AM EDT	Areal Flood Advisory	PHI	Kent, New Castle	3 hr
Jul 3, 12:41 AM EDT	Severe Thunderstorm Warning	PHI	Kent	50 min
Jul 3, 3:27 PM EDT	High Surf Advisory	PHI	Sussex	41 hr
Jul 2, 10:50 PM EDT	Special Weather Statement	PHI	Talbot	55 min
Jul 2, 11:20 PM EDT	Special Weather Statement	PHI	Caroline, Queen Anne's	55 min
Jul 2, 11:24 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Queen Anne's, Talbot	66 min
Jul 3, 5:36 PM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent	69 min
Jul 3, 7:00 PM EDT	Special Weather Statement	PHI	Caroline, Kent, Queen Anne's, Talbot	60 min
Jul 2, 8:25 PM EDT	Flash Flood Warning	PHI	Bucks	4 hr
Jul 2, 8:33 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	57 min
Jul 2, 10:08 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	67 min
Jul 2, 10:38 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery, Philadelphia	112 min
Jul 3, 1:22 PM EDT	Special Weather Statement	PHI	Northampton	38 min
Jul 3, 1:57 PM EDT	Tornado Warning	PHI	Northampton	24 min
Jul 3, 3:15 PM EDT	Special Weather Statement	PHI	Lebanon	45 min
Jul 3, 4:08 PM EDT	Special Weather Statement	PHI	Carbon	52 min
Jul 3, 5:06 PM EDT	Special Weather Statement	PHI	Monroe	24 min
Jul 3, 5:55 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	35 min
Jul 3, 5:58 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	62 min
Jul 3, 6:02 PM EDT	Tornado Warning	PHI	Carbon, Monroe	28 min
Jul 3, 6:17 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	4 hr
Jul 3, 6:19 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	56 min
Jul 3, 6:46 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	44 min
Jul 3, 6:47 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	58 min
Jul 3, 6:54 PM EDT	Special Weather Statement	PHI	Montgomery	66 min
Jul 3, 7:02 PM EDT	Areal Flood Advisory	PHI	Northampton	4 hr
Jul 3, 7:25 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Northampton	65 min
Jul 3, 7:29 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	61 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2014 Severe Thunderstorm Warnings in Delaware, 2014 Severe Thunderstorm Warnings in Maryland, 2014 Every severe thunderstorm warning 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; radar from the NEXRAD Level II archive.