Alert archive / New York / Areal Flood Advisories in 2021

Areal Flood Advisory 64, NWS New York, NY

July 12, 2021Orange County, Rockland County, New York; Bergen County, Passaic County, New Jersey

NWS New York, NY issued this areal flood advisory at Jul 12, 2021, 10:09 PM EDT for Orange County, Rockland County, New York; Bergen County, Passaic County, New Jersey. It was in force for 111 min.

The area

The counties it named.

The facts

Issued: Jul 12, 2021, 10:09 PM EDT (02:09 UTC)
Expired: Jul 13, 2021, 12:00 AM EDT
In force: 111 min
Issued by: NWS New York, NY
Area: Storm-based polygon

Counties Bergen County, NJ, Passaic County, NJ, Orange County, NY, Rockland County, NY

The radar

The Brookhaven radar (KOKX), 114 km from the middle of the area, began a volume at 02:08 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

Albany, NY (KALY), launched 00:00Z, 2.2 hours before the alert went out and 175 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 598 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

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

NWS New York, NY wrote its last area forecast discussion before this areal flood advisory went out at Jul 12, 9:56 PM EDT, 13 minutes earlier.

Area forecast discussion, Jul 12, 9:56 PM EDT, 13 minutes before

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Hazardous weather outlook, Jul 12, 9:04 PM EDT, 1 hour 5 minutes before

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In the hours before

Special weather statement, Jul 12, 5:41 PM EDT, 4 hours 28 minutes before

Special Weather Statement
National Weather Service New York NY
541 PM EDT Mon Jul 12 2021

NJZ002-004-103-NYZ067-069-122230-
Western Bergen-Western Passaic-Eastern Passaic-Rockland-Orange-
541 PM EDT Mon Jul 12 2021

...A STRONG THUNDERSTORM WILL AFFECT PASSAIC...NORTHWESTERN BERGEN...
SOUTH CENTRAL ORANGE AND ROCKLAND COUNTIES...

At 540 PM EDT, a strong thunderstorm was located over West Milford,
moving east at 25 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Wayne, New City, West Milford, Monsey, Ramsey, Ringwood, Pompton
Lakes, Suffern, Sloatsburg, Bloomingdale, Pomona, Upper Greenwood
Lake, Spring Valley, Oakland and Wanaque.

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

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4107 7449 4109 7450 4120 7437 4124 7445
      4118 7396 4091 7427 4093 7429 4097 7428
      4098 7430 4100 7430 4100 7435 4101 7435
      4101 7439 4103 7442 4102 7443 4104 7443
      4105 7445 4104 7450
TIME...MOT...LOC 2140Z 277DEG 21KT 4112 7442

JM

Local storm report, Jul 12, 7:27 PM EDT, 2 hours 42 minutes before

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Local storm report, Jul 12, 7:58 PM EDT, 2 hours 11 minutes before

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Local storm report, Jul 12, 8:14 PM EDT, 1 hour 55 minutes before

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Local storm report, Jul 12, 8:59 PM EDT, 1 hour 10 minutes before

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Local storm report, Jul 12, 9:00 PM EDT, 1 hour 9 minutes before

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Nearby

Areal Flood Advisories in New York, 2021 Areal Flood Advisories in New Jersey, 2021 Every areal flood advisory in 2021

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.