Alert archive / New York / Mesoscale Discussions in 2003

Mesoscale Discussion 2417

September 27, 200315 counties in New York

The Storm Prediction Center issued this mesoscale discussion at Sep 27, 2003, 1:58 AM EDT for 15 counties in New York. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Sep 27, 2003, 1:58 AM EDT (05:58 UTC)
Expired: Sep 27, 2003, 3:00 AM EDT
In force: 62 min
Issued by: the Storm Prediction Center

Counties Allegany County, NY, Cattaraugus County, NY, Cayuga County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Monroe County, NY, Niagara County, NY, Ontario County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Wayne County, NY, Wyoming County, NY, Yates County, NY

The radar

The Buffalo radar (KBUF), 62 km from the middle of the area, began a volume at 06:01 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.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 934Sep 27, 2:35 AM EDT

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 6.0 hours before the alert went out and 59 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: 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

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
Sep 27, 2:35 AM EDT	Tornado Watch	SPC	Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 6 more	5 hr
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

Nearby

Mesoscale Discussions in New York, 2003 Every mesoscale discussion 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.