Alert archive / Maryland / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 247, NWS Philadelphia/Mount Holly

July 21, 2019Cecil County, Maryland; Salem County, New Jersey; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 21, 2019, 10:13 PM EDT for Cecil County, Maryland; Salem County, New Jersey; New Castle County, Delaware. It was in force for 47 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 21, 2019, 10:13 PM EDT (02:13 UTC)
Expired
Jul 21, 2019, 11:00 PM EDT
In force
47 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

The radar

The Dover AFB radar (KDOX), 86 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.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 2.2 hours before the alert went out and 172 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-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 2019-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 157 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2019-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -73 square meters per square second.1939Sfc1 km3 km6 kmRMLM
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
157 J/kg
Mixed-layer CIN
-308 J/kg
Mixed-layer LCL
1994 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-73 m²/s²
0-3 km storm-relative helicity
-77 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

313 
WUUS51 KPHI 220213
SVRPHI
DEC003-MDC015-NJC033-220300-
/O.NEW.KPHI.SV.W.0247.190722T0213Z-190722T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1013 PM EDT Sun Jul 21 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  New Castle County in northern Delaware...
  Eastern Cecil County in northeastern Maryland...
  Salem County in southern New Jersey...

* Until 1100 PM EDT.

* At 1013 PM EDT, severe thunderstorms were located along a line
  extending from Barksdale to near Glasgow to Bohemias Mills, moving
  east at 30 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Wilmington, Newark, Middletown, Elkton, Pennsville, Carneys Point,
  Elsmere, New Castle, Penns Grove, Salem, North East, Woodstown,
  Alloway, Quinton, Delaware City, Newport, Cecilton, Arden, Warwick
  and Barksdale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3981 7556 3981 7544 3962 7526 3945 7542
      3941 7542 3946 7554 3957 7551 3962 7557
      3966 7552 3972 7551 3962 7561 3958 7556
      3958 7557 3946 7559 3941 7554 3939 7592
      3954 7588 3964 7597
TIME...MOT...LOC 0213Z 264DEG 27KT 3965 7582 3956 7573 3945 7579 

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

Staarmann
2 follow-up statements
713 
WWUS51 KPHI 220224
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1024 PM EDT Sun Jul 21 2019

DEC003-MDC015-NJC033-220300-
/O.CON.KPHI.SV.W.0247.000000T0000Z-190722T0300Z/
New Castle DE-Cecil MD-Salem NJ-
1024 PM EDT Sun Jul 21 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR NEW CASTLE...NORTHEASTERN CECIL AND SALEM COUNTIES...

At 1022 PM EDT, severe thunderstorms were located along a line
extending from Newark to Saint Georges to Middletown, moving east at 
30 mph. Law enforcement relayed several reports of wind damage 
across Cecil County, especially near Elkton.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Law enforcement.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Wilmington, Newark, Middletown, Elkton, Pennsville, Carneys Point,
Elsmere, New Castle, Penns Grove, Salem, North East, Woodstown,
Alloway, Quinton, Delaware City, Newport, Arden, Barksdale, Stanton
and Glasgow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms have a history of producing wind damage across Cecil 
County. SEEK SHELTER NOW inside a sturdy structure and stay away 
from windows.
 
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3981 7556 3981 7544 3962 7526 3945 7542
      3941 7542 3946 7554 3957 7551 3962 7557
      3966 7552 3972 7551 3962 7561 3958 7556
      3958 7557 3946 7559 3941 7554 3943 7586
      3954 7584 3964 7597
TIME...MOT...LOC 0222Z 264DEG 27KT 3966 7575 3957 7566 3946 7572 

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

Staarmann
063 
WWUS51 KPHI 220239
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1039 PM EDT Sun Jul 21 2019

MDC015-220248-
/O.CAN.KPHI.SV.W.0247.000000T0000Z-190722T0300Z/
Cecil MD-
1039 PM EDT Sun Jul 21 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CECIL COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3982 7550 3979 7542 3978 7544 3962 7526
      3949 7539 3948 7554 3957 7551 3962 7557
      3967 7551 3971 7549 3972 7551 3962 7561
      3959 7561 3959 7557 3950 7558 3948 7561
      3964 7579 3966 7579
TIME...MOT...LOC 0238Z 254DEG 25KT 3965 7555 

$$

DEC003-NJC033-220300-
/O.CON.KPHI.SV.W.0247.000000T0000Z-190722T0300Z/
New Castle DE-Salem NJ-
1039 PM EDT Sun Jul 21 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR NORTHERN NEW CASTLE AND NORTHWESTERN SALEM COUNTIES...

At 1038 PM EDT, a severe thunderstorm was located over New Castle, or
near Wilmington, moving east at 30 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Wilmington, Newark, Pennsville, Carneys Point, Elsmere, New Castle,
Penns Grove, Salem, Woodstown, Alloway, Quinton, Delaware City,
Newport, Arden, Stanton, Glasgow, Bear, Hancocks Bridge, Wilmington
Manor and Saint Georges.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3982 7550 3979 7542 3978 7544 3962 7526
      3949 7539 3948 7554 3957 7551 3962 7557
      3967 7551 3971 7549 3972 7551 3962 7561
      3959 7561 3959 7557 3950 7558 3948 7561
      3964 7579 3966 7579
TIME...MOT...LOC 0238Z 254DEG 25KT 3965 7555 

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

Staarmann

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 9:30 PM EDTSevere Thunderstorm WarningPHICecil45 min
Jul 21, 9:44 PM EDTSevere Thunderstorm WarningPHICecil, Kent46 min
Jul 21, 9:55 PM EDTAreal Flood AdvisoryPHICecil87 min
Jul 22, 3:47 PM EDTSevere Thunderstorm WarningPHICecil58 min
Jul 22, 4:11 PM EDTAreal Flood AdvisoryPHICecil4 hr
Jul 22, 4:16 PM EDTSevere Thunderstorm WarningPHICecil, Kent59 min
Jul 22, 4:21 PM EDTAreal Flood AdvisoryPHICecil, Kent2 hr
Jul 22, 5:14 PM EDTSevere Thunderstorm WarningPHICecil, Kent61 min
Jul 21, 8:25 PM EDTSpecial Weather StatementPHIWarren50 min
Jul 21, 8:44 PM EDTSevere Thunderstorm WarningPHIWarren46 min
Jul 21, 9:05 PM EDTSpecial Weather StatementPHIMorris25 min
Jul 21, 9:24 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Somerset, Warren51 min
Jul 21, 10:12 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Monmouth, Morris, Somerset48 min
Jul 21, 10:15 PM EDTSpecial Marine WarningPHI60 min
Jul 21, 10:54 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem25 min
Jul 21, 10:58 PM EDTSpecial Marine WarningPHI62 min
Jul 21, 11:02 PM EDTSevere Thunderstorm WarningPHIMonmouth31 min
Jul 21, 11:27 PM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean48 min
Jul 21, 11:31 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden44 min
Jul 21, 11:40 PM EDTSevere Thunderstorm WarningPHIHunterdon, Warren50 min
Jul 21, 11:54 PM EDTSevere Thunderstorm WarningPHIBurlington, Monmouth, Ocean51 min
Jul 22, 12:00 AM EDTSpecial Marine WarningPHI90 min
Jul 22, 12:16 AM EDTSpecial Weather StatementPHIMercer29 min
Jul 22, 12:34 AM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean41 min
Jul 22, 1:50 PM EDTSpecial Weather StatementPHIWarren25 min
Jul 22, 2:00 PM EDTSpecial Weather StatementPHISussex45 min
Jul 22, 2:13 PM EDTSpecial Weather StatementPHIWarren32 min
Jul 22, 2:35 PM EDTSevere Thunderstorm WarningPHIMorris, Sussex, Warren40 min
Jul 22, 2:58 PM EDTSmall Craft AdvisoryPHI27 hr
Jul 22, 3:02 PM EDTAreal Flood AdvisoryPHIMorris, Sussex, Warren4 hr
Jul 22, 3:12 PM EDTSevere Thunderstorm WarningPHIMorris, Sussex48 min
Jul 22, 3:33 PM EDTAreal Flood AdvisoryPHIWarren7 hr
Jul 22, 3:43 PM EDTFlash Flood WarningPHISussex4 hr
Jul 22, 4:24 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Sussex, Warren51 min
Jul 22, 4:40 PM EDTAreal Flood AdvisoryPHICamden, Cumberland, Gloucester, Salem114 min
Jul 22, 4:52 PM EDTSpecial Marine WarningPHI53 min
Jul 22, 5:01 PM EDTSevere Thunderstorm WarningPHIMorris, Sussex, Warren44 min
Jul 22, 5:04 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester41 min
Jul 22, 5:17 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Somerset, Warren73 min
Jul 22, 5:34 PM EDTFlash Flood WarningPHIHunterdon, Morris, Sussex, Warren4 hr
Jul 22, 5:40 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Cumberland, Gloucester, Mercer and 4 more80 min
Jul 22, 5:43 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Camden, Hunterdon, Mercer, Middlesex and 4 more3 hr
Jul 22, 5:50 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset and 1 more40 min
Jul 22, 5:52 PM EDTSpecial Marine WarningPHI53 min
Jul 22, 6:09 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Cape May, Cumberland, Ocean51 min
Jul 22, 6:12 PM EDTSpecial Marine WarningPHI93 min
Jul 22, 6:21 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Cumberland, Monmouth, Ocean4 hr
Jul 22, 6:27 PM EDTSpecial Marine WarningPHI48 min
Jul 22, 6:27 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Monmouth, Morris, Somerset34 min
Jul 22, 6:35 PM EDTFlash Flood WarningPHIHunterdon, Middlesex, Morris, Somerset4 hr
Jul 22, 6:38 PM EDTSpecial Marine WarningPHI67 min
Jul 22, 6:54 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Cape May, Cumberland, Monmouth, Ocean51 min
Jul 22, 7:39 PM EDTSpecial Marine WarningPHI96 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2019Severe Thunderstorm Warnings in New Jersey, 2019Severe Thunderstorm Warnings in Delaware, 2019Every severe thunderstorm warning in 2019

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.