Alert archive / New York / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 789

July 21, 20034 states

The Storm Prediction Center issued this severe thunderstorm watch at Jul 21, 2003, 3:35 PM EDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jul 21, 2003, 3:35 PM EDT (19:35 UTC)
Expired: Jul 21, 2003, 10:00 PM EDT
In force: 6 hr
Issued by: the Storm Prediction Center

Counties Berkshire County, MA, Albany County, NY, Chenango County, NY, Columbia County, NY, Delaware County, NY, Dutchess County, NY, Greene County, NY, Montgomery County, NY, Otsego County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Sullivan County, NY, Ulster County, NY, Washington County, NY, Lackawanna County, PA, Wayne County, PA, Bennington County, VT

The radar

The Albany radar (KENX), 50 km from the middle of the area, began a volume at 19:36 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.

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jul 21, 3:41 PM EDT	Tornado Warning	ALY	Albany, Schenectady	49 min
Jul 21, 4:11 PM EDT	Severe Thunderstorm Warning	ALY	Rensselaer, Saratoga, Washington	64 min
Jul 21, 5:57 PM EDT	Severe Thunderstorm Warning	BGM	Chenango	48 min
Jul 21, 6:04 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Susquehanna	41 min
Jul 21, 6:22 PM EDT	Severe Thunderstorm Warning	BGM	Delaware, Otsego	53 min
Jul 21, 6:43 PM EDT	Severe Thunderstorm Warning	BGM	Sullivan	62 min
Jul 21, 6:44 PM EDT	Severe Thunderstorm Warning	BGM	Sullivan	61 min
Jul 21, 6:57 PM EDT	Severe Thunderstorm Warning	ALY	Schoharie	63 min
Jul 21, 7:08 PM EDT	Severe Thunderstorm Warning	BGM	Delaware, Otsego	27 min
Jul 21, 7:09 PM EDT	Severe Thunderstorm Warning	ALY	Dutchess	36 min
Jul 21, 7:09 PM EDT	Severe Thunderstorm Warning	ALY	Ulster	66 min
Jul 21, 7:15 PM EDT	Severe Thunderstorm Warning	ALY	Greene	75 min
Jul 21, 7:47 PM EDT	Severe Thunderstorm Warning	ALY	Albany	58 min
Jul 21, 8:00 PM EDT	Severe Thunderstorm Warning	ALY	Columbia, Dutchess	60 min
Jul 21, 8:06 PM EDT	Tornado Warning	ALY	Greene	39 min
Jul 21, 8:15 PM EDT	Severe Thunderstorm Warning	ALY	Ulster	30 min
Jul 21, 8:20 PM EDT	Tornado Warning	ALY	Columbia	25 min
Jul 21, 8:22 PM EDT	Severe Thunderstorm Warning	ALY	Rensselaer	53 min
Jul 21, 8:30 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	60 min
Jul 21, 8:43 PM EDT	Tornado Warning	ALY	Columbia, Rensselaer	47 min
Jul 21, 8:45 PM EDT	Severe Thunderstorm Warning	ALY	Washington	60 min
Jul 21, 9:27 PM EDT	Tornado Warning	ALY	Bennington	48 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, 7.6 hours before the alert went out and 72 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: 159 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 906 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 21, 6:30 PM EDT	Severe Thunderstorm Watch	SPC		5 hr
Jul 21, 7:51 PM EDT	Mesoscale Discussion	SPC		84 min
Jul 21, 2:46 PM EDT	Mesoscale Discussion	SPC	Berkshire, Franklin, Hampshire	119 min
Jul 21, 1:15 PM EDT	Mesoscale Discussion	SPC	Allegany, Broome, Cattaraugus, Chemung, Schuyler, Steuben and 2 more	2 hr
Jul 21, 1:40 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Broome, Chemung, Cortland, Schuyler, Steuben and 2 more	6 hr
Jul 21, 3:51 PM EDT	Mesoscale Discussion	SPC	Allegany, Broome, Chemung, Cortland, Schuyler, Steuben and 2 more	114 min
Jul 21, 8:40 AM EDT	Severe Thunderstorm Watch	SPC	Allegheny, Armstrong, Beaver, Butler, Clarion, Greene and 4 more	5 hr

Nearby

Severe Thunderstorm Watches in New York, 2003 Severe Thunderstorm Watches in Pennsylvania, 2003 Severe Thunderstorm Watches in Connecticut, 2003 Every severe thunderstorm 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.