Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 120, NWS Philadelphia/Mount Holly

July 13, 2014Chester County, Delaware County, Pennsylvania; Cecil County, Kent County, Maryland; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 13, 2014, 10:14 PM EDT for Chester County, Delaware County, Pennsylvania; Cecil County, Kent County, Maryland; New Castle County, Delaware. It was in force for 46 min. 1 report 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 13, 2014, 10:14 PM EDT (02:14 UTC)
Expired: Jul 13, 2014, 11:00 PM EDT
In force: 46 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

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

The radar

The Dover AFB radar (KDOX), 83 km from the middle of the area, began a volume at 02:14 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 13, 10:25 PM EDT	TSTM WND DMG	Rising Sun, MD	TREES DOWN ACROSS ROAD.

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 13, 7:49 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 2.2 hours before the alert went out and 145 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: 569 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 1600 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 172 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.

538 
WUUS51 KPHI 140214
SVRPHI
DEC003-MDC015-029-PAC029-045-140300-
/O.NEW.KPHI.SV.W.0120.140714T0214Z-140714T0300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1014 PM EDT SUN JUL 13 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 1100 PM EDT

* AT 1010 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  AROUND CONOWINGO DAM TO NEAR ANNAPOLIS...MOVING NORTHEAST AT
  40 MPH. THESE STORMS ARE CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  ZION AND NEWTOWN AROUND 1020 PM EDT...
  NORTHEAST AND WEST GROVE AROUND 1025 PM EDT...
  CHESTERTOWN AND LADENBERG AROUND 1030 PM EDT...
  MARSHALLTON AND NEWARK AROUND 1035 PM EDT...
  WEST CHESTER AND MILLINGTON AROUND 1040 PM EDT...
  PAOLI AND TALLEYVILLE AROUND 1045 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 1100 PM EDT
SUNDAY EVENING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 3932 7619 3944 7600 3952 7599 3964 7616
      3973 7615 3987 7600 4007 7537 3994 7524
      3962 7560 3959 7559 3964 7557 3947 7558
      3936 7550 3924 7582 3924 7601 3914 7608
      3908 7624 3917 7629
TIME...MOT...LOC 0213Z 244DEG 50KT 3978 7602 3912 7632

$$

IOVINO

1 follow-up statement

411 
WWUS51 KPHI 140237
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1037 PM EDT SUN JUL 13 2014

DEC003-MDC015-029-PAC029-045-140300-
/O.CON.KPHI.SV.W.0120.000000T0000Z-140714T0300Z/
DELAWARE PA-NEW CASTLE DE-CECIL MD-KENT MD-CHESTER PA-
1037 PM EDT SUN JUL 13 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR SOUTHERN CHESTER...KENT...CECIL...NEW CASTLE AND DELAWARE
COUNTIES...

AT 1035 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE 
EXTENDING FROM OXFORD IN PENNSYLVANIA TO PORT DEPOSIT...BETTERTON 
AND ROCK HALL IN MARYLAND. THE LINE WAS MOVING NORTHEAST AT 40 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  WEST GOSHEN...WEST CHESTER...MILLINGTON AND BROOKSIDE BY 1050 PM
  EDT...

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 1100 PM EDT
SUNDAY EVENING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 3932 7619 3944 7600 3952 7599 3964 7616
      3973 7615 3987 7600 4007 7537 3994 7524
      3962 7560 3959 7559 3964 7557 3947 7558
      3936 7550 3924 7582 3924 7601 3914 7608
      3908 7624 3917 7629
TIME...MOT...LOC 0235Z 244DEG 50KT 3991 7566 3925 7596

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 8:04 PM EDT	Special Weather Statement	PHI	Carbon	71 min
Jul 13, 8:33 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	57 min
Jul 13, 8:41 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	2 hr
Jul 13, 9:04 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	56 min
Jul 13, 9:16 PM EDT	Special Weather Statement	PHI	Northampton	89 min
Jul 13, 9:33 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	57 min
Jul 13, 9:44 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Northampton	46 min
Jul 13, 10:06 PM EDT	Special Weather Statement	PHI	Berks	54 min
Jul 13, 10:41 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	2 hr
Jul 13, 10:48 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	37 min
Jul 13, 11:07 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	38 min
Jul 13, 11:21 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	54 min
Jul 13, 11:27 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery	2 hr
Jul 14, 3:54 AM EDT	Flash Flood Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	45 hr
Jul 14, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	62 min
Jul 14, 4:38 PM EDT	Areal Flood Advisory	PHI	Chester	3 hr
Jul 14, 4:50 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	4 hr
Jul 14, 5:06 PM EDT	Special Weather Statement	PHI	Bucks	54 min
Jul 14, 5:09 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery	3 hr
Jul 14, 5:16 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	59 min
Jul 14, 5:31 PM EDT	Flash Flood Warning	PHI	Bucks, Lehigh, Northampton	3 hr
Jul 14, 7:39 PM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Montgomery, Philadelphia	3 hr
Jul 14, 7:53 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	67 min
Jul 13, 9:26 PM EDT	Special Weather Statement	PHI	Cecil, Kent	64 min
Jul 13, 10:02 PM EDT	Special Weather Statement	PHI	Cecil, Kent, Queen Anne's	58 min
Jul 14, 6:04 PM EDT	Special Weather Statement	PHI	Caroline, Cecil, Kent, Queen Anne's	56 min
Jul 14, 6:28 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Cecil, Kent, Queen Anne's	62 min
Jul 14, 7:16 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	74 min
Jul 14, 7:49 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's	51 min
Jul 14, 7:03 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	42 min
Jul 14, 7:29 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	46 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2014 Severe Thunderstorm Warnings in Maryland, 2014 Severe Thunderstorm Warnings in Delaware, 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.