Alert archive / New Jersey / Special Weather Statements in 2020

Special Weather Statement, NWS Philadelphia/Mount Holly

August 13, 2020Cape May County, New Jersey

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 13, 2020, 3:54 PM EDT for Cape May County, New Jersey. It was in force for 36 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: Aug 13, 2020, 3:54 PM EDT (19:54 UTC)
Expired: Aug 13, 2020, 4:30 PM EDT
In force: 36 min
Issued by: NWS Philadelphia/Mount Holly

County Cape May County, NJ

The radar

The Dover AFB radar (KDOX), 59 km from the middle of the area, began a volume at 19:54 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 7.9 hours before the alert went out and 143 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: 1152 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 760 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: -19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Philadelphia/Mount Holly wrote its last area forecast discussion before this special weather statement went out at Aug 13, 3:54 PM EDT, 0 minutes earlier.

Area forecast discussion, Aug 13, 3:54 PM EDT, 0 minutes before

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Hazardous weather outlook, Aug 13, 3:47 PM EDT, 7 minutes before

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In the hours before

Local storm report, Aug 13, 1:08 PM EDT, 2 hours 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
108 PM EDT THU AUG 13 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1259 PM     FLASH FLOOD      1 E GRASONVILLE         38.96N 76.19W
08/13/2020                   QUEEN ANNE'S       MD   DEPT OF HIGHWAYS

            STATE HIGHWAY 18 NEAR GRASONVILLE CEMETERY
            ROAD CLOSED FROM FLOODING. TIME BASED ON
            DISPATCH REPORT.

&&

CMS

Special weather statement, Aug 13, 1:30 PM EDT, 2 hours 24 minutes before

Special Weather Statement
National Weather Service Mount Holly NJ
130 PM EDT Thu Aug 13 2020

NJZ021>023-131815-
Cumberland-Atlantic-Cape May-
130 PM EDT Thu Aug 13 2020

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN CUMBERLAND AND
NORTHWESTERN CAPE MAY COUNTIES...

At 130 PM EDT, a strong thunderstorm was located over Belleplain
Forest, or 10 miles southeast of Millville, moving north at 10 mph.

Wind gusts up to 40 mph are possible with this storm.

Locations impacted include...
Vineland, Millville, Cumberland, Laurel Lake, Woodbine, Estell Manor,
Mauricetown, Belleplain Forest, Leesburg, Port Norris, Bricksboro,
Port Elizabeth, Bivalve and Eldora.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 3921 7483 3921 7508 3938 7512 3942 7483
TIME...MOT...LOC 1730Z 179DEG 11KT 3929 7491

JEO

Local storm report, Aug 13, 2:19 PM EDT, 1 hour 35 minutes before

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Local storm report, Aug 13, 3:18 PM EDT, 36 minutes before

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Local storm report, Aug 13, 3:20 PM EDT, 34 minutes before

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Special weather statement, Aug 13, 3:54 PM EDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 3:02 AM EDT	Flash Flood Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 7 more	17 hr
Aug 13, 7:47 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Somerset	118 min
Aug 13, 8:37 AM EDT	Flash Flood Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	3 hr
Aug 13, 9:36 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Middlesex, Morris, Somerset	114 min
Aug 13, 10:01 AM EDT	Flash Flood Warning	PHI	Middlesex, Morris, Somerset	3 hr
Aug 13, 1:06 PM EDT	Special Weather Statement	PHI	Ocean	39 min
Aug 13, 1:30 PM EDT	Special Weather Statement	PHI	Cumberland	45 min
Aug 13, 1:56 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland	2 hr
Aug 13, 1:58 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Ocean	2 hr
Aug 13, 2:44 PM EDT	Areal Flood Advisory	PHI	Atlantic	2 hr
Aug 13, 4:01 PM EDT	Areal Flood Advisory	PHI	Cape May	2 hr
Aug 13, 4:52 PM EDT	Flash Flood Warning	PHI	Cape May	113 min
Aug 13, 7:25 AM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery	2 hr
Aug 13, 9:07 AM EDT	Flash Flood Warning	PHI	Bucks, Montgomery	3 hr
Aug 13, 3:30 PM EDT	Areal Flood Advisory	PHI	Philadelphia	3 hr
Aug 13, 3:56 PM EDT	Areal Flood Advisory	PHI	Delaware	2 hr
Aug 13, 4:45 PM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	84 min
Aug 13, 11:46 AM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
Aug 13, 11:56 AM EDT	Areal Flood Advisory	PHI	Kent, Sussex	3 hr
Aug 13, 12:22 PM EDT	Special Weather Statement	PHI	Sussex	38 min
Aug 13, 10:14 AM EDT	Flash Flood Warning	PHI	Kent, Queen Anne's	4 hr
Aug 13, 11:28 AM EDT	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	4 hr
Aug 13, 12:02 PM EDT	Flash Flood Warning	PHI	Kent, Queen Anne's	2 hr

Nearby

Special Weather Statements in New Jersey, 2020 Every special weather statement in 2020

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.