Alert archive / New York / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 84

April 18, 2004Berkshire County, Massachusetts; 9 counties in New York

The Storm Prediction Center issued this severe thunderstorm watch at Apr 18, 2004, 3:25 PM EDT for Berkshire County, Massachusetts; 9 counties in New York. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Apr 18, 2004, 3:25 PM EDT (19:25 UTC)
Expired
Apr 18, 2004, 7:00 PM EDT
In force
4 hr
Issued by
the Storm Prediction Center

Counties Berkshire County, MA, Albany County, NY, Columbia County, NY, Delaware County, NY, Dutchess County, NY, Greene County, NY, Otsego County, NY, Schoharie County, NY, Sullivan County, NY, Ulster County, NY

The radar

The Albany radar (KENX), 34 km from the middle of the area, began a volume at 19:29 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

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

IssuedProductOfficeCountiesLasted
Apr 18, 3:40 PM EDTSevere Thunderstorm WarningALYSchoharie65 min
Apr 18, 3:52 PM EDTSevere Thunderstorm WarningBGMDelaware38 min
Apr 18, 4:05 PM EDTSevere Thunderstorm WarningALYAlbany, Greene, Ulster75 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

Albany, NY (KALY), launched 12:00Z, 7.4 hours before the alert went out and 56 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, Albany, 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, Albany, NY at 12:00Z on 2004-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -18 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
539 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
-18 m²/s²
0-3 km storm-relative helicity
145 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, 2:17 PM EDTMesoscale DiscussionSPC118 min
Apr 18, 4:55 PM EDTMesoscale DiscussionSPC65 min
Apr 18, 10:29 AM EDTMesoscale DiscussionSPCCayuga, Cortland, Erie, Genesee, Livingston, Madison and 10 more3 hr
Apr 18, 11:45 AM EDTSevere Thunderstorm WatchSPCCayuga, Chenango, Cortland, Delaware, Livingston, Madison and 11 more5 hr

Nearby

Severe Thunderstorm Watches in New York, 2004Severe Thunderstorm Watches in Connecticut, 2004Severe Thunderstorm Watches in Massachusetts, 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; radar from the NEXRAD Level II archive.