Alert archive / Maryland / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 124, NWS Philadelphia/Mount Holly

July 23, 20164 states

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 23, 2016, 5:03 PM EDT for 4 states. It was in force for 28 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 23, 2016, 5:03 PM EDT (21:03 UTC)
Expired: Jul 23, 2016, 5:31 PM EDT
In force: 28 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties New Castle County, DE, Cecil County, MD, Salem County, NJ, Chester County, PA

The radar

The Dover AFB radar (KDOX), 112 km from the middle of the area, began a volume at 21:05 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 23, 5:07 PM EDT	TSTM WND DMG	Atglen, PA	UTILITY POLE AND WIRES DOWN... TREES DOWN.
Jul 23, 5:15 PM EDT	TSTM WND DMG	Wilmington, DE	TREES AND WIRES DOWN ON CENTERVILLE ROAD

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.1 hours before the alert went out and 153 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: 444 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 1393 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

615 
WUUS51 KPHI 232103
SVRPHI
DEC003-MDC015-NJC033-PAC029-232145-
/O.NEW.KPHI.SV.W.0124.160723T2103Z-160723T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
503 PM EDT SAT JUL 23 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  CENTRAL CECIL COUNTY IN NORTHEASTERN MARYLAND...
  NORTHWESTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHWESTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 545 PM EDT

* AT 501 PM EDT...A CLUSTER OF SEVERE THUNDERSTORMS WAS LOCATED FROM
  SOUTHERN CHESTER COUNTY TO CECIL COUNTY...MOVING SOUTHEAST AT 40
  MPH.

  HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE 
           TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  WILMINGTON...NEWARK...MIDDLETOWN...ELKTON...CALVERT...PENNSVILLE...
  CARNEYS POINT...ELSMERE...KENNETT SQUARE...NEW CASTLE...
  PENNS GROVE...SALEM...OXFORD...PARKESBURG...NORTH EAST...
  WEST GROVE...RISING SUN...DELAWARE CITY...CHARLESTOWN AND NEWPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THESE STORMS. MOVE INDOORS
IMMEDIATELY. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

&&

LAT...LON 3972 7614 3974 7612 3973 7610 3974 7610
      3976 7606 3981 7603 3983 7604 3987 7599
      3995 7600 4001 7595 3973 7538 3969 7532
      3933 7558 3959 7611 3972 7623
TIME...MOT...LOC 2101Z 303DEG 35KT 3985 7592 

HAIL...1.00IN
WIND...60MPH
 
$$

GORSE

2 follow-up statements

646 
WWUS51 KPHI 232124
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
524 PM EDT SAT JUL 23 2016

DEC003-MDC015-NJC033-PAC029-232145-
/O.CON.KPHI.SV.W.0124.000000T0000Z-160723T2145Z/
NEW CASTLE DE-CECIL MD-SALEM NJ-CHESTER PA-
524 PM EDT SAT JUL 23 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR NEW CASTLE...CENTRAL CECIL...NORTHWESTERN SALEM AND SOUTHWESTERN
CHESTER COUNTIES...

AT 522 PM EDT...A CLUSTER OF SEVERE THUNDERSTORMS WERE LOCATED FROM
SOUTHERN CHESTER COUNTY INTO NEW CASTLE COUNTY...MOVING SOUTHEAST AT
40 MPH. THE STORMS ARE WEAKENING SOME, HOWEVER LOCALLY DAMAGING
WINDS AND HAIL ARE STILL POSSIBLE.

HAZARD...60 MPH WIND GUSTS AND PENNY SIZE HAIL. 

SOURCE...RADAR INDICATED. 

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

LOCATIONS IMPACTED INCLUDE...
WILMINGTON...NEWARK...MIDDLETOWN...ELKTON...CALVERT...PENNSVILLE...
CARNEYS POINT...ELSMERE...KENNETT SQUARE...NEW CASTLE...
PENNS GROVE...SALEM...OXFORD...NORTH EAST...WEST GROVE...
RISING SUN...DELAWARE CITY...CHARLESTOWN...
NEWPORT AND BOHEMIAS MILLS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO GROUND
LIGHTNING IS OCCURRING WITH SOME OF THE STORMS. MOVE INDOORS
IMMEDIATELY. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

TORRENTIAL RAINFALL IS OCCURRING WITH THESE STORMS...AND MAY LEAD TO
FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 3972 7623 3972 7614 3973 7610 3974 7609
      3976 7606 3981 7603 3983 7604 3983 7602
      3987 7599 3995 7581 3973 7538 3969 7532
      3933 7558 3959 7611
TIME...MOT...LOC 2122Z 303DEG 35KT 3974 7570 

HAIL...0.75IN
WIND...60MPH
 
$$

GORSE

793 
WWUS51 KPHI 232131
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
531 PM EDT SAT JUL 23 2016

DEC003-MDC015-NJC033-PAC029-232140-
/O.CAN.KPHI.SV.W.0124.000000T0000Z-160723T2145Z/
NEW CASTLE DE-CECIL MD-SALEM NJ-CHESTER PA-
531 PM EDT SAT JUL 23 2016

...THE SEVERE THUNDERSTORM WARNING FOR NEW CASTLE...CENTRAL CECIL...
NORTHWESTERN SALEM AND SOUTHWESTERN CHESTER COUNTIES IS CANCELLED...
                
THE STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING HAS BEEN CANCELLED.  HOWEVER GUSTY WINDS AND
HEAVY RAIN ARE STILL POSSIBLE WITH THESE THUNDERSTORMS.

LAT...LON 3972 7623 3972 7614 3973 7610 3974 7609
      3976 7606 3981 7603 3983 7604 3983 7602
      3987 7599 3995 7581 3973 7538 3969 7532
      3933 7558 3959 7611
TIME...MOT...LOC 2130Z 303DEG 35KT 3969 7561 

$$

GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 4:12 PM EDT	Heat Advisory	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	50 hr
Jul 23, 5:55 PM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent	65 min
Jul 23, 6:46 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's	44 min
Jul 23, 3:58 PM EDT	Special Weather Statement	PHI	Chester	47 min
Jul 23, 4:10 PM EDT	Special Weather Statement	PHI	Philadelphia	50 min
Jul 23, 4:28 PM EDT	Severe Thunderstorm Warning	PHI	Chester	47 min
Jul 23, 4:55 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Montgomery, Philadelphia	35 min
Jul 23, 5:24 PM EDT	Severe Thunderstorm Warning	PHI	Philadelphia	51 min
Jul 23, 5:10 PM EDT	Special Marine Warning	PHI		65 min
Jul 23, 5:43 PM EDT	Special Weather Statement	PHI	Ocean	62 min
Jul 23, 5:55 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Ocean	65 min
Jul 23, 6:05 PM EDT	Special Marine Warning	PHI		85 min
Jul 23, 7:11 PM EDT	Special Weather Statement	PHI	Atlantic	34 min
Jul 23, 7:18 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	27 min
Jul 23, 7:23 PM EDT	Special Marine Warning	PHI		82 min
Jul 23, 7:31 PM EDT	Special Weather Statement	PHI	Kent	29 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2016 Severe Thunderstorm Warnings in Pennsylvania, 2016 Severe Thunderstorm Warnings in New Jersey, 2016 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.