Alert archive / Maryland / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 80, NWS Philadelphia/Mount Holly

July 3, 2014Cecil County, Kent County, Maryland; Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 3, 2014, 5:36 PM EDT for Cecil County, Kent County, Maryland; Chester County, Pennsylvania. It was in force for 69 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, 5:36 PM EDT (21:36 UTC)
Expired: Jul 3, 2014, 6:45 PM EDT
In force: 69 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Cecil County, MD, Kent County, MD, Chester County, PA

The radar

The Dover AFB radar (KDOX), 101 km from the middle of the area, began a volume at 21:37 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, 6:15 PM EDT	TSTM WND DMG	Oxford, PA	TREES AND WIRES DOWN.
Jul 3, 6:20 PM EDT	TSTM WND GST 50	West Grove, 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, 9.6 hours before the alert went out and 14 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.

955 
WUUS51 KPHI 032136
SVRPHI
MDC015-029-PAC029-032245-
/O.NEW.KPHI.SV.W.0080.140703T2136Z-140703T2245Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CECIL COUNTY IN NORTHEAST MARYLAND...
  NORTHERN KENT COUNTY IN NORTHEAST MARYLAND...
  SOUTHWESTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 645 PM EDT

* AT 533 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  DELTA TO PLEASANT HILLS TO BOWLEYS QUARTERS...MOVING EAST AT 25
  MPH. THESE STORMS ARE CAPABLE OF PRODUCING ONE INCH DIAMETER
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  ROCK SPRINGS AROUND 555 PM EDT...
  OCTORARO AND CONOWINGO AROUND 600 PM EDT...
  RICHARDSMERE AND NEWTOWN AROUND 605 PM EDT...
  MOUNT VERNON AND GLEN ROY AROUND 610 PM EDT...
  HOMEVILLE AND WOODLAWN AROUND 615 PM EDT...
  OXFORD AND BETTERTON AROUND 620 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.

THIS LINE OF SEVERE THUNDERSTORMS HAS ALREADY MADE WIND DAMAGE AND
LARGE HAIL.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS LINE OF
SEVERE THUNDERSTORMS. WHEN THUNDER ROARS...MOVE INDOORS! REMEMBER...
IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING.

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 3930 7619 3932 7619 3943 7601 3946 7602
      3952 7599 3955 7603 3954 7608 3957 7610
      3957 7609 3956 7608 3957 7608 3972 7623
      3973 7614 3979 7605 3988 7599 3997 7600
      4006 7594 4008 7578 3927 7590 3922 7625
TIME...MOT...LOC 2135Z 249DEG 21KT 3974 7626 3951 7638
          3930 7639

$$

FORECASTER: HEAVENER/VIVOLA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 10:24 PM EDT	Special Weather Statement	PHI	Cecil	36 min
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 2, 11:47 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	58 min
Jul 3, 12:04 AM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's	56 min
Jul 3, 12:34 AM EDT	Areal Flood Advisory	PHI	Cecil, Kent, Queen Anne's	3 hr
Jul 3, 6:21 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	39 min
Jul 3, 7:00 PM EDT	Special Weather Statement	PHI	Caroline, Kent, Queen Anne's, Talbot	60 min
Jul 2, 8:08 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Philadelphia	52 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 Maryland, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.