Alert archive / New York / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 81

April 18, 200417 counties in New York

The Storm Prediction Center issued this severe thunderstorm watch at Apr 18, 2004, 11:45 AM EDT for 17 counties in New York. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 18, 2004, 11:45 AM EDT (15:45 UTC)
Expired
Apr 18, 2004, 5:00 PM EDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Cayuga County, NY, Chenango County, NY, Cortland County, NY, Delaware County, NY, Livingston County, NY, Madison County, NY, Monroe County, NY, Oneida County, NY, Onondaga County, NY, Ontario County, NY, Oswego County, NY, Otsego County, NY, Schuyler County, NY, Seneca County, NY, Tompkins County, NY, Wayne County, NY, Yates County, NY

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 18, 11:53 AM EDTSevere Thunderstorm WarningBUFLivingston, Monroe52 min
Apr 18, 12:19 PM EDTSevere Thunderstorm WarningBUFOntario56 min
Apr 18, 12:34 PM EDTSevere Thunderstorm WarningBUFWayne56 min
Apr 18, 12:42 PM EDTSevere Thunderstorm WarningBUFLivingston33 min
Apr 18, 1:09 PM EDTSevere Thunderstorm WarningBGMSeneca51 min
Apr 18, 1:34 PM EDTSevere Thunderstorm WarningBGMCayuga41 min
Apr 18, 1:40 PM EDTTornado WarningBGMCayuga50 min
Apr 18, 1:46 PM EDTSevere Thunderstorm WarningBGMSchuyler, Tompkins44 min
Apr 18, 2:00 PM EDTSevere Thunderstorm WarningBGMCortland60 min
Apr 18, 2:34 PM EDTSevere Thunderstorm WarningBGMChenango41 min
Apr 18, 3:13 PM EDTSevere Thunderstorm WarningBGMDelaware, Otsego47 min
Apr 18, 3:52 PM EDTSevere Thunderstorm WarningBGMDelaware38 min

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 12:00Z, 3.8 hours before the alert went out and 159 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, Buffalo Intl Airport, NY at 12:00Z on 2004-04-18Temperature 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, Buffalo Intl Airport, NY at 12:00Z on 2004-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 square meters per square second.1939587897Sfc1 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
1052 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
151 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 18, 10:29 AM EDTMesoscale DiscussionSPCCayuga, Cortland, Erie, Genesee, Livingston, Madison and 10 more3 hr
Apr 18, 2:17 PM EDTMesoscale DiscussionSPCAlbany, Broome, Cayuga, Chenango, Columbia, Cortland and 21 more118 min
Apr 18, 3:25 PM EDTSevere Thunderstorm WatchSPCAlbany, Columbia, Delaware, Dutchess, Greene, Otsego and 3 more4 hr
Apr 18, 4:55 PM EDTMesoscale DiscussionSPCAlbany, Columbia, Dutchess, Greene, Ulster65 min

Nearby

Severe Thunderstorm Watches in New York, 2004Every severe thunderstorm watch in 2004

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.