Alert archive / Maryland / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 122, NWS Philadelphia/Mount Holly

July 13, 20144 states

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 13, 2014, 10:48 PM EDT for 4 states. It was in force for 37 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: Jul 13, 2014, 10:48 PM EDT (02:48 UTC)
Expired: Jul 13, 2014, 11:25 PM EDT
In force: 37 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, New Castle County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA

The radar

The Dover AFB radar (KDOX), 72 km from the middle of the area, began a volume at 02:49 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 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, 2.8 hours before the alert went out and 162 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.

733 
WUUS51 KPHI 140248
SVRPHI
DEC001-003-MDC011-015-029-035-NJC015-033-PAC029-045-140345-
/O.NEW.KPHI.SV.W.0122.140714T0248Z-140714T0345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1048 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...
  NORTHWESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  EASTERN CECIL COUNTY IN NORTHEAST MARYLAND...
  KENT COUNTY IN NORTHEAST MARYLAND...
  SOUTHEASTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHWESTERN KENT COUNTY IN CENTRAL DELAWARE...
  NORTHERN CAROLINE COUNTY IN EASTERN MARYLAND...
  QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...
  SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 1145 PM EDT

* AT 1044 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  NEAR MARSHALLTON AND AVONDALE IN PENNSYLVANIA TO BETTERTON AND ROCK
  HALL IN MARYLAND. THE STORMS WERE MOVING EAST AT 35 MPH. THESE
  STORMS ARE CAPABLE OF PRODUCING DAMAGING WIND GUSTS AND HAIL. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  CHEYNEY AND WESTTOWN AROUND 1055 PM EDT...
  GRADYVILLE AND TALLEYVILLE AROUND 1100 PM EDT...
  MILLINGTON AND WILMINGTON MANOR AROUND 1105 PM EDT...
  NEWTOWN SQUARE AND NEW CASTLE AROUND 1110 PM EDT...
  BROOMALL AND TROUT LAKE AROUND 1115 PM EDT...
  EAST LANSDOWNE AND DREXEL HILL AROUND 1120 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 3890 7636 3901 7630 3900 7621 3910 7625
      3998 7571 4002 7531 3994 7524 3988 7526
      3989 7514 3985 7509 3951 7529 3946 7541
      3938 7543 3946 7555 3959 7555 3947 7558
      3929 7542 3894 7563
TIME...MOT...LOC 0247Z 261DEG 30KT 3991 7563 3908 7614

$$

IOVINO

1 follow-up statement

240 
WWUS51 KPHI 140325
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1125 PM EDT SUN JUL 13 2014

DEC001-003-MDC011-015-029-035-NJC015-033-PAC029-045-140332-
/O.CAN.KPHI.SV.W.0122.000000T0000Z-140714T0345Z/
DELAWARE PA-GLOUCESTER NJ-NEW CASTLE DE-CECIL MD-KENT MD-CHESTER PA-
KENT DE-CAROLINE MD-QUEEN ANNE'S MD-SALEM NJ-
1125 PM EDT SUN JUL 13 2014

...THE SEVERE THUNDERSTORM WARNING FOR SALEM...QUEEN ANNE'S...
NORTHERN CAROLINE...NORTHWESTERN KENT...SOUTHEASTERN CHESTER...
KENT...EASTERN CECIL...NEW CASTLE...NORTHWESTERN GLOUCESTER AND
DELAWARE COUNTIES IS CANCELLED...

AT 1120 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT 
THE LINE OF THUNDERSTORMS WAS CONTINUING TO WEAKEN. AS A 
RESULT...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT FOR 
NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND 
SOUTHEASTERN PENNSYLVANIA.

LAT...LON 3890 7636 3901 7630 3900 7621 3910 7625
      3998 7571 4002 7531 3994 7524 3988 7526
      3989 7514 3985 7509 3951 7529 3946 7541
      3938 7543 3946 7555 3959 7555 3947 7558
      3929 7542 3894 7563
TIME...MOT...LOC 0322Z 261DEG 30KT 3995 7525 3913 7577

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 10:02 PM EDT	Special Weather Statement	PHI	New Castle	58 min
Jul 13, 10:14 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	46 min
Jul 14, 3:54 AM EDT	Flash Flood Watch	PHI	Kent, New Castle, Sussex	45 hr
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
Jul 14, 7:49 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	51 min
Jul 13, 9:26 PM EDT	Special Weather Statement	PHI	Cecil, Kent	64 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 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, 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, 3:43 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, 10:18 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Somerset	57 min
Jul 13, 10:27 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	47 min
Jul 13, 11:05 PM EDT	Special Marine Warning	PHI		85 min
Jul 13, 11:47 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex	43 min
Jul 14, 4:02 AM EDT	Small Craft Advisory	PHI		24 hr
Jul 14, 4:08 PM EDT	Special Weather Statement	PHI	Monmouth	52 min
Jul 14, 4:12 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	63 min
Jul 14, 4:17 PM EDT	Special Weather Statement	PHI	Sussex	58 min
Jul 14, 4:21 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex	3 hr
Jul 14, 4:28 PM EDT	Flash Flood Warning	PHI	Monmouth, Ocean	4 hr
Jul 14, 5:33 PM EDT	Special Weather Statement	PHI	Monmouth	57 min
Jul 14, 5:54 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Warren	4 hr
Jul 14, 6:15 PM EDT	Flash Flood Warning	PHI	Hunterdon, Morris, Sussex, Warren	4 hr
Jul 14, 6:54 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Somerset	3 hr
Jul 14, 7:17 PM EDT	Special Weather Statement	PHI	Mercer	58 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2014 Severe Thunderstorm Warnings in Delaware, 2014 Severe Thunderstorm Warnings in Pennsylvania, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.