Alert archive / New York / Mesoscale Discussions in 2009

Mesoscale Discussion 554

April 24, 20097 counties in New York; 7 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2009, 6:51 PM EDT for 7 counties in New York; 7 counties in Pennsylvania. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Apr 24, 2009, 6:51 PM EDT (22:51 UTC)
Expired: Apr 24, 2009, 7:45 PM EDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Allegany County, NY, Cattaraugus County, NY, Genesee County, NY, Livingston County, NY, Ontario County, NY, Steuben County, NY, Wyoming County, NY, Cameron County, PA, Elk County, PA, Forest County, PA, Jefferson County, PA, McKean County, PA, Potter County, PA, Warren County, PA

The radar

The Buffalo radar (KBUF), 105 km from the middle of the area, began a volume at 22:50 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 nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 10.9 hours before the alert went out and 103 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: 3139 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 144 m²/s²
0-3 km storm-relative helicity: 208 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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Nearby

Mesoscale Discussions in New York, 2009 Mesoscale Discussions in Pennsylvania, 2009 Every mesoscale discussion in 2009

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.