Alert archive / New Jersey / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 310

May 19, 199711 counties in New Jersey; 9 counties in New York; Bucks County, Pennsylvania

The Storm Prediction Center issued this severe thunderstorm watch at May 19, 1997, 9:45 PM EDT for 11 counties in New Jersey; 9 counties in New York; Bucks County, Pennsylvania. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 19, 1997, 9:45 PM EDT (01:45 UTC)
Expired: May 20, 1997, 1:00 AM EDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 21 counties

Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Union County, NJ, Bronx County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Putnam County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Westchester County, NY, Bucks County, PA

The radar

The Brookhaven radar (KOKX), 87 km from the middle of the area, began a volume at 01:47 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.

Warnings issued inside it

2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
May 19, 10:02 PM EDT	Severe Thunderstorm Warning	OKX	Putnam	58 min
May 19, 10:45 PM EDT	Severe Thunderstorm Warning	OKX	Nassau	60 min

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 1.8 hours before the alert went out and 87 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: 43 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 1358 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 252 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.

111 
WWUS9 KMKC 200111
SEL0  
MKC WW 200111
NYZ000-NJZ000-CTZ000-200500-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 310
STORM PREDICTION CENTER NORMAN OK
911 PM EDT MON MAY 19 1997

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR ALL OR PORTIONS OF

   SOUTHEAST NEW YORK                           
   NORTHERN NEW JERSEY                         
   CONNECTICUT                        
   AND ADJACENT COASTAL WATERS

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 945 PM UNTIL
100 AM EDT.

HAIL TO 1 1/4 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 45 STATUTE MILES
EAST AND WEST OF A LINE FROM 20 MILES EAST SOUTHEAST OF TRENTON NEW
JERSEY TO WINDSOR LOCKS CONNECTICUT.

OTHER WATCH INFORMATION...  CONTINUE...WW 306...WW 307...WW
308...WW 309...

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

DISCUSSION...DAMAGING BOW ECHO MOVING RAPIDLY ACROSS EASTERN PA. 
WHILE THE INTENSITY OF THE LINE IS EXPECTED TO GRADUALLY WEAKEN AS
IT MOVES INTO SOMEWHAT MORE STABLE AIRMASS...WINDS ARE STILL
EXPECTED TO BE ABOVE SEVERE LIMITS INTO CT NRN NJ AND SERN NY.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 1/4 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 480.  MEAN STORM
MOTION VECTOR 27040.


...HALES

401,0751 415,0733 415,0714 401,0733

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 19, 8:00 PM EDT	Severe Thunderstorm Watch	SPC	Sussex, Warren	4 hr

Nearby

Severe Thunderstorm Watches in New Jersey, 1997 Severe Thunderstorm Watches in New York, 1997 Severe Thunderstorm Watches in Connecticut, 1997 Every severe thunderstorm watch in 1997

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.