Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 50, NWS New York, NY

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

NWS New York, NY issued this severe thunderstorm warning at Jul 12, 2021, 5:51 PM EDT for Orange County, Rockland County, New York; Bergen County, Passaic County, New Jersey. It was in force for 39 min. 1 report 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 12, 2021, 5:51 PM EDT (21:51 UTC)
Expired: Jul 12, 2021, 6:30 PM EDT
In force: 39 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 125 km from the middle of the area, began a volume at 21:53 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 12, 6:00 PM EDT	TSTM WND DMG	West Milford, NJ	TREES AND WIRES DOWN.

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 12, 3:34 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.9 hours before the alert went out and 128 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: 857 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 697 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

810 
WUUS51 KOKX 122151
SVROKX
NJC003-031-NYC071-087-122230-
/O.NEW.KOKX.SV.W.0050.210712T2151Z-210712T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
551 PM EDT Mon Jul 12 2021

The National Weather Service in Upton NY has issued a

* Severe Thunderstorm Warning for...
  Passaic County in northeastern New Jersey...
  Northwestern Bergen County in northeastern New Jersey...
  South central Orange County in southeastern New York...
  Rockland County in southeastern New York...

* Until 630 PM EDT.

* At 550 PM EDT, a severe thunderstorm was located over West Milford,
  moving east at 25 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor hail damage to vehicles is possible. Expect wind 
           damage to trees and power lines.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

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

&&

LAT...LON 4120 7437 4122 7440 4124 7430 4117 7395
      4095 7421 4098 7430 4100 7430 4100 7435
      4101 7435 4101 7439 4103 7442 4102 7443
      4104 7443 4105 7445 4104 7449 4104 7450
      4107 7449 4109 7450
TIME...MOT...LOC 2150Z 277DEG 20KT 4111 7437 

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

JM

The office that day

Everything else NWS New York, NY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 12, 2:18 AM EDT	Special Weather Statement	OKX	Bronx, Kings, Nassau, New York, Queens	42 min
Jul 12, 3:37 PM EDT	Special Marine Warning	OKX		38 min
Jul 12, 3:45 PM EDT	Special Weather Statement	OKX	Richmond	30 min
Jul 12, 3:53 PM EDT	Areal Flood Advisory	OKX	Richmond	49 min
Jul 12, 4:18 PM EDT	Areal Flood Advisory	OKX	Bronx, New York	52 min
Jul 12, 5:38 PM EDT	Areal Flood Advisory	OKX	Orange, Rockland	112 min
Jul 12, 5:41 PM EDT	Special Weather Statement	OKX	Rockland	49 min
Jul 12, 6:09 PM EDT	Flash Flood Warning	OKX	Orange, Rockland	3 hr
Jul 12, 6:15 PM EDT	Tornado Warning	OKX	Orange, Rockland	45 min
Jul 12, 6:58 PM EDT	Severe Thunderstorm Warning	OKX	Orange, Rockland	41 min
Jul 12, 7:46 PM EDT	Areal Flood Advisory	OKX	Orange	119 min
Jul 12, 4:55 PM EDT	Areal Flood Advisory	OKX	Bergen	32 min

Nearby

Severe Thunderstorm Warnings in New York, 2021 Severe Thunderstorm Warnings in New Jersey, 2021 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.