Alert archive / New York / Tornado Watches in 2003
Tornado Watch 934
The Storm Prediction Center issued this tornado watch at Sep 27, 2003, 2:35 AM EDT for 12 counties in New York; Erie County, Pennsylvania. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 27, 2003, 2:35 AM EDT (06:35 UTC)
- Expired
- Sep 27, 2003, 8:00 AM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
Counties Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Monroe County, NY, Niagara County, NY, Ontario County, NY, Orleans County, NY, Wayne County, NY, Wyoming County, NY, Erie County, PA
The radar
The Buffalo radar (KBUF), 41 km from the middle of the area, began a volume at 06:36 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.
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 6.6 hours before the alert went out and 39 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1576 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 248 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 270635
SEL4
SPC WW 270635
NYZ000-LOZ000-LEZ000-271200-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 934
NWS STORM PREDICTION CENTER NORMAN OK
235 AM EDT SAT SEP 27 2003
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
WESTERN NEW YORK
LAKE ONTARIO
LAKE ERIE
EFFECTIVE THIS SATURDAY MORNING FROM 235 AM UNTIL 800 AM EDT.
TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 60 STATUTE MILES EAST AND WEST
OF A LINE FROM 25 MILES NORTH NORTHWEST OF ROCHESTER NEW YORK TO
15 MILES SOUTHEAST OF JAMESTOWN NEW YORK.
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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 933...
DISCUSSION...ENVIRONMENT OVER WRN NY CONTINUES TO BECOME MORE
FAVORABLE FOR WIND DAMAGE AND/OR ISOLATED TORNADOES AS BROKEN SQUALL
LINE PROGRESSES EWD ACROSS LAKE ERIE. TEMPERATURES HAVE WARMED A
FEW DEGREES AT THE SURFACE SUGGESTING SOME MIXING IS OCCURRING
WITHIN THE BOUNDARY LAYER AND CAP IS WEAKENING. IN
ADDITION...STRONGEST PRESSURE FALLS AND LOWER 60F SURFACE DEW POINTS
HAVE SPREAD NWD INTO THE REGION. GIVEN THE EXTREME SHEAR WITH 0-1
KM SHEAR IN EXCESS OF 35 KT...EMBEDDED BRIEF SUPERCELLS OR SMALL
SCALE BOW ECHOES CAN BE EXPECTED AS STORMS MOVE ACROSS WRN NY EARLY
THIS MORNING.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 350.
MEAN STORM MOTION VECTOR 24040.
...EVANS
432,0763 415,0775 415,0801 432,0790SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 27, 1:58 AM EDT | Mesoscale Discussion | SPC | Allegany, Cattaraugus, Cayuga, Erie, Genesee, Livingston and 9 more | 62 min |
| Sep 27, 6:39 AM EDT | Mesoscale Discussion | SPC | Allegany, Cattaraugus, Chautauqua, Erie, Livingston, Wyoming | 96 min |
| Sep 27, 2:22 PM EDT | Mesoscale Discussion | SPC | Broome, Cayuga, Chemung, Ontario, Schuyler, Seneca and 4 more | 113 min |
| Sep 27, 4:05 PM EDT | Severe Thunderstorm Watch | SPC | Cayuga, Chemung, Cortland, Onondaga, Ontario, Schuyler and 6 more | 5 hr |
| Sep 27, 6:52 PM EDT | Mesoscale Discussion | SPC | Cayuga, Ontario, Schuyler, Seneca, Steuben, Wayne and 1 more | 53 min |
| Sep 27, 12:06 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Crawford, Lawrence and 3 more | 84 min |
| Sep 27, 12:40 AM EDT | Tornado Watch | SPC | Beaver, Butler, Crawford, Forest, Lawrence, Mercer and 2 more | 5 hr |
| Sep 27, 3:37 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 17 more | 113 min |
| Sep 27, 5:15 AM EDT | Mesoscale Discussion | SPC | Beaver, Crawford, Lawrence, Mercer, Venango, Warren | 60 min |
Nearby
Tornado Watches in New York, 2003Tornado Watches in Pennsylvania, 2003Every tornado watch in 2003
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.