Alert archive / New York / Special Weather Statements in 2021

Special Weather Statement, NWS New York, NY

July 21, 2021Nassau County, New York

NWS New York, NY issued this special weather statement at Jul 21, 2021, 1:21 PM EDT for Nassau County, New York. It was in force for 39 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, 2021, 1:21 PM EDT (17:21 UTC)
Expired: Jul 21, 2021, 2:00 PM EDT
In force: 39 min
Issued by: NWS New York, NY

County Nassau County, NY

The radar

The Brookhaven radar (KOKX), 32 km from the middle of the area, began a volume at 17:24 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

Brookhaven, NY (KOKX), launched 12:00Z, 5.4 hours before the alert went out and 32 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: 130 J/kg
Mixed-layer CIN: -165 J/kg
Mixed-layer LCL: 1495 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

583 
WWUS81 KOKX 211721
SPSOKX

Special Weather Statement
National Weather Service New York NY
121 PM EDT Wed Jul 21 2021

NYZ078-080-177-179-211800-
Southwest Suffolk-Northwest Suffolk-Northern Nassau-Southern Nassau-
121 PM EDT Wed Jul 21 2021

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT WESTERN SUFFOLK AND
NASSAU COUNTIES...

At 121 PM EDT, strong thunderstorms were clustered near Plainview, 
moving east at 40 mph.

Winds in excess of 40 mph and pea size hail are possible with this
storm.

Locations impacted include...
Islip, Brentwood, Levittown, Freeport, Commack, Huntington Station,
Centereach, Shirley, Deer Park, Lindenhurst, Glen Cove, Plainview,
Medford, Massapequa and Hauppauge.

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

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southeastern New York.

LAT...LON 4086 7366 4092 7364 4093 7352 4096 7349
      4094 7342 4097 7340 4094 7334 4095 7329
      4092 7322 4093 7317 4098 7317 4099 7313
      4097 7293 4088 7289 4086 7290 4079 7286
      4076 7287 4074 7301 4073 7302 4063 7363
TIME...MOT...LOC 1721Z 253DEG 45KT 4078 7349 

$$

DS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 12:03 PM EDT	Special Weather Statement	OKX	Orange	42 min
Jul 21, 12:39 PM EDT	Special Weather Statement	OKX	Orange	51 min
Jul 21, 12:50 PM EDT	Special Weather Statement	OKX	Kings, Nassau, Queens	40 min
Jul 21, 12:55 PM EDT	Special Weather Statement	OKX	Westchester	50 min
Jul 21, 1:50 PM EDT	Special Marine Warning	OKX		40 min
Jul 21, 2:25 PM EDT	Special Marine Warning	OKX		50 min
Jul 21, 2:55 PM EDT	Special Marine Warning	OKX		65 min
Jul 21, 3:18 PM EDT	Special Marine Warning	OKX		42 min
Jul 21, 3:30 PM EDT	Special Marine Warning	OKX		34 min
Jul 21, 3:49 PM EDT	Special Marine Warning	OKX		33 min
Jul 21, 4:28 PM EDT	Special Weather Statement	OKX	Nassau, Queens	47 min
Jul 21, 5:23 PM EDT	Special Weather Statement	OKX	Queens	52 min
Jul 21, 11:47 AM EDT	Special Weather Statement	OKX	Bergen	43 min
Jul 21, 1:47 PM EDT	Special Weather Statement	OKX		43 min
Jul 21, 1:55 PM EDT	Severe Thunderstorm Warning	OKX	Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region	24 min
Jul 21, 6:06 PM EDT	Special Weather Statement	OKX		24 min
Jul 21, 6:25 PM EDT	Special Weather Statement	OKX		35 min
Jul 21, 6:56 PM EDT	Special Weather Statement	OKX		49 min

Nearby

Special Weather Statements in New York, 2021 Every special weather statement 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.