Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 88, NWS New York, NY

December 6, 2021Suffolk County, New York

NWS New York, NY issued this severe thunderstorm warning at Dec 6, 2021, 9:27 PM EST for Suffolk County, New York. It was in force for 48 min. 3 reports 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: Dec 6, 2021, 9:27 PM EST (02:27 UTC)
Expired: Dec 6, 2021, 10:15 PM EST
In force: 48 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Suffolk County, NY

The radar

The Brookhaven radar (KOKX), 30 km from the middle of the area, began a volume at 02:27 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
Dec 6, 9:43 PM EST	TSTM WND DMG	Shirley, NY	TREE BRANCHES REPORTED DOWN NEAR DRIVEWAY ON FRONT LAWN.
Dec 6, 9:48 PM EST	TSTM WND GST 60	1 Nw Stony Brook, NY	A CONVECTIVE WIND GUST OF 60 MPH WAS MEASURED AT EW5678 STONY BROOK STATION.
Dec 6, 10:07 PM EST	MARINE TSTM WIND 50	4 Se Hampton Bays, NY	A MARINE THUNDERSTORM WIND GUST OF 43 KTS WAS MEASURED AT SHINNECOCK LIGHT STATION.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 2.5 hours before the alert went out and 30 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: 868 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 295 m²/s²
0-3 km storm-relative helicity: 405 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

418 
WUUS51 KOKX 070227
SVROKX
NYC103-070315-
/O.NEW.KOKX.SV.W.0088.211207T0227Z-211207T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
927 PM EST Mon Dec 6 2021

The National Weather Service in Upton NY has issued a

* Severe Thunderstorm Warning for...
  Suffolk County in southeastern New York...

* Until 1015 PM EST.

* At 925 PM EST, showers producing damaging winds were located along 
  a line extending from 10 miles south of Branford to near Captree 
  State Park, moving east at 55 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to trees and power lines.

* Locations impacted include...
  Islip, Riverhead, Centereach, Shirley, Medford, Southold,
  Hauppauge, Ronkonkoma, Manorville, Stony Brook, Patchogue, Middle
  Island, Port Jefferson, Wading River and Center Moriches.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4067 7328 4067 7330 4099 7314 4099 7265
      4115 7236 4120 7209 4110 7229 4105 7225
      4105 7219 4108 7216 4104 7212 4108 7212
      4110 7216 4114 7213 4110 7206 4094 7214
      4065 7305 4061 7335
TIME...MOT...LOC 0225Z 280DEG 47KT 4113 7283 4066 7318 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JM

1 follow-up statement

043 
WWUS51 KOKX 070257
SVSOKX

Severe Weather Statement
National Weather Service New York NY
957 PM EST Mon Dec 6 2021

NYC103-070315-
/O.CON.KOKX.SV.W.0088.000000T0000Z-211207T0315Z/
Suffolk NY-
957 PM EST Mon Dec 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM EST
FOR EASTERN SUFFOLK COUNTY...

At 956 PM EST, a squall line of showers producing damaging winds was 
located along a line extending from Shelter Island to 14 miles 
southeast of Mastic Beach, moving east at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to trees and power lines.

Locations impacted include...
Riverhead, Southold, Manorville, Center Moriches, Mattituck,
Southampton, Westhampton, Sag Harbor, Bridgehampton, Plum Island,
Gardiners Island, Calverton, Noyack, Shelter Island and Greenport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4094 7214 4073 7282 4098 7279 4099 7265
      4115 7236 4120 7211 4110 7229 4105 7225
      4105 7219 4108 7216 4104 7212 4108 7212
      4110 7216 4114 7213 4110 7206
TIME...MOT...LOC 0256Z 280DEG 47KT 4106 7233 4059 7268 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JM

The office that day

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

Issued	Product	Office	Lasted
Dec 6, 9:17 PM EST	Special Marine Warning	OKX	43 min
Dec 6, 9:46 PM EST	Special Marine Warning	OKX	44 min
Dec 6, 10:02 PM EST	Special Marine Warning	OKX	43 min
Dec 7, 3:41 AM EST	Small Craft Advisory	OKX	9 hr

Nearby

Severe Thunderstorm Warnings in New York, 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.