Alert archive / New York / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 671

August 9, 200019 counties in New York; Ashtabula County, Geauga County, Ohio; 9 counties in Pennsylvania

The Storm Prediction Center issued this severe thunderstorm watch at Aug 9, 2000, 5:15 PM EDT for 19 counties in New York; Ashtabula County, Geauga County, Ohio; 9 counties in Pennsylvania. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Aug 9, 2000, 5:15 PM EDT (21:15 UTC)
Expired: Aug 9, 2000, 11:00 PM EDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 30 counties

Allegany County, NY, Cattaraugus County, NY, Cayuga County, NY, Chautauqua County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Monroe County, NY, Niagara County, NY, Onondaga County, NY, Ontario County, NY, Orleans County, NY, Oswego County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Wayne County, NY, Wyoming County, NY, Yates County, NY, Ashtabula County, OH, Geauga County, OH, Cameron County, PA, Crawford County, PA, Elk County, PA, Erie County, PA, Forest County, PA, McKean County, PA, Potter County, PA, Venango County, PA, Warren County, PA

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Aug 9, 6:07 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Ontario	53 min
Aug 9, 6:30 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus	60 min
Aug 9, 6:30 PM EDT	Severe Thunderstorm Warning	CLE	Ashtabula	60 min
Aug 9, 6:38 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	52 min
Aug 9, 6:46 PM EDT	Severe Thunderstorm Warning	CLE	Erie	59 min
Aug 9, 6:56 PM EDT	Severe Thunderstorm Warning	BGM	Chemung, Schuyler, Steuben	64 min
Aug 9, 7:00 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	60 min
Aug 9, 7:12 PM EDT	Severe Thunderstorm Warning	CLE	Crawford	63 min
Aug 9, 7:19 PM EDT	Severe Thunderstorm Warning	BUF	Erie	46 min
Aug 9, 7:40 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus	65 min
Aug 9, 7:41 PM EDT	Severe Thunderstorm Warning	CLE	Geauga	49 min
Aug 9, 8:02 PM EDT	Tornado Warning	CLE	Geauga	28 min
Aug 9, 8:33 PM EDT	Severe Thunderstorm Warning	BGM	Steuben	42 min

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 9.3 hours before the alert went out and 223 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: 270 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 706 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

944 
WWUS9 KMKC 092039
SEL1  

SEL1  
MKC WW 092035
NYZ000-OHZ000-PAZ000-LOZ000-LEZ000-100300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 671
STORM PREDICTION CENTER NORMAN OK
435 PM EDT WED AUG 9 2000

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

   WESTERN NEW YORK                           
   NORTHEAST OHIO                               
   NORTHWEST PENNSYLVANIA                       
   LAKE ONTARIO                       
   LAKE ERIE                          

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 515 PM UNTIL
1100 PM EDT.

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

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 90 STATUTE MILES
EAST AND WEST OF A LINE FROM 5 MILES EAST SOUTHEAST OF FRANKLIN
PENNSYLVANIA TO 45 MILES NORTHEAST OF ROCHESTER NEW YORK.

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.

OTHER WATCH INFORMATION...  CONTINUE...WW 666...WW 667...WW
668...WW 669...WW 670...

DISCUSSION...TSTMS ARE DEVELOPING ON LAKE BREEZE CIRCULATIONS AND
ALSO A CONVECTIVE SYSTEM ORGANIZING OVER SRN ONTARIO. ACTIVITY
LIKELY TO BECOME SEVERE AS IT MOVES ESEWD THIS EVENING IN
ASSOCIATION WITH STRONG UPPER TROUGH.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. 
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM MOTION
VECTOR 28035.

...VESCIO

433,0751 411,0780 411,0813 433,0784

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 9, 8:00 AM EDT	Severe Thunderstorm Watch	SPC	Butler, Champaign, Clark, Clinton, Darke, Fayette and 8 more	5 hr
Aug 9, 10:30 AM EDT	Severe Thunderstorm Watch	SPC	Adams, Athens, Brown, Champaign, Clark, Clinton and 26 more	6 hr
Aug 9, 4:15 PM EDT	Severe Thunderstorm Watch	SPC	Athens, Brown, Butler, Champaign, Clark, Clermont and 33 more	6 hr
Aug 9, 7:00 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Clermont, Gallia, Jackson, Lawrence and 2 more	6 hr
Aug 9, 1:00 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Bedford, Cumberland, Fayette, Franklin, Fulton and 4 more	6 hr

Nearby

Severe Thunderstorm Watches in New York, 2000 Severe Thunderstorm Watches in Pennsylvania, 2000 Severe Thunderstorm Watches in Ohio, 2000 Every severe thunderstorm watch in 2000

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.