Alert archive / New York / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 17, NWS New York, NY

May 20, 1998Suffolk County, New York

NWS New York, NY issued this severe thunderstorm warning at May 20, 1998, 7:44 PM EDT for Suffolk County, New York. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 20, 1998, 7:44 PM EDT (23:44 UTC)
Expired
May 20, 1998, 8:30 PM EDT
In force
46 min
Issued by
NWS New York, NY
Area
Whole counties

County Suffolk County, NY

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.7 hours before the alert went out and 17 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 1998-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 1998-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 151 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1584 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
151 m²/s²
0-3 km storm-relative helicity
234 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

315 
WUUS1 KNYC 202346 RRA
SVRNYC
ANZ330-335-350-355-NYC103-210030-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
744 PM EDT WED MAY 20 1998

THE NATIONAL WEATHER SERVICE IN NEW YORK HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN SUFFOLK COUNTY INCLUDING ADJACENT COASTAL WATERS IN
  SOUTHEASTERN NEW YORK

* UNTIL 830 PM EDT


* AT 743 PM EDT... NATIONAL WEATHER SERVICE DOPPLER RADAR IN UPTON
  NY INDICATED A SEVERE THUNDERSTORM IN WESTERN SUFFOLK COUNTY
MOVING SOUTHEAST AT 25 MPH.  HALF INCH HAIL WAS REPORTED IN
WHEATLEY HEIGHTS AT 735.

THIS STORM HAS A HISTORY OF LARGE HAIL. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS

MAW/MEW

The office that day

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

IssuedProductOfficeCountiesLasted
May 20, 4:59 PM EDTSevere Thunderstorm WarningOKXOrange, Rockland61 min
May 20, 5:17 PM EDTSevere Thunderstorm WarningOKXPutnam48 min
May 20, 5:42 PM EDTSevere Thunderstorm WarningOKXWestchester63 min
May 20, 6:33 PM EDTSevere Thunderstorm WarningOKXKings47 min
May 20, 6:33 PM EDTSevere Thunderstorm WarningOKXNew York47 min
May 20, 6:42 PM EDTSevere Thunderstorm WarningOKXQueens48 min
May 20, 7:00 PM EDTSevere Thunderstorm WarningOKXNassau40 min

Nearby

Severe Thunderstorm Warnings in New York, 1998Every severe thunderstorm warning in 1998

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.