Alert archive / New York / Mesoscale Discussions in 2019

Mesoscale Discussion 2140

November 1, 20194 states

The Storm Prediction Center issued this mesoscale discussion at Nov 1, 2019, 12:50 AM EDT for 4 states. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Nov 1, 2019, 12:50 AM EDT (04:50 UTC)
Expired: Nov 1, 2019, 2:15 AM EDT
In force: 85 min
Issued by: the Storm Prediction Center

All 22 counties

Berkshire County, MA, Hampden County, MA, Hampshire County, MA, Worcester County, MD, Atlantic County, NJ, Bergen County, NJ, Cape May County, NJ, Hudson County, NJ, Monmouth County, NJ, Ocean County, NJ, Bronx County, NY, Columbia County, NY, Dutchess County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Putnam County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Suffolk County, NY, Westchester County, NY

The radar

The Philadelphia radar (KDIX), 38 km from the middle of the area, began a volume at 04:53 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

Brookhaven, NY (KOKX), launched 00:00Z, 4.8 hours before the alert went out and 129 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: 486 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 491 m²/s²
0-3 km storm-relative helicity: 510 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 31, 9:02 PM EDT	Severe Thunderstorm Watch	SPC	Dorchester, Somerset, Wicomico, Worcester	5 hr
Oct 31, 9:58 PM EDT	Mesoscale Discussion	SPC	Anne Arundel, Calvert, Caroline, Cecil, Dorchester, Harford and 8 more	2 hr
Oct 31, 8:21 PM EDT	Mesoscale Discussion	SPC	Albany, Broome, Chenango, Columbia, Delaware, Fulton and 16 more	54 min
Oct 31, 11:16 PM EDT	Mesoscale Discussion	SPC	Albany, Columbia, Dutchess, Fulton, Greene, Montgomery and 10 more	119 min

Nearby

Mesoscale Discussions in New York, 2019 Mesoscale Discussions in Connecticut, 2019 Mesoscale Discussions in New Jersey, 2019 Every mesoscale discussion in 2019

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.