Alert archive / Connecticut / Frost Advisories in 2013

Frost Advisory 1, NWS New York, NY

April 20, 2013Suffolk County, New York; Union County, New Jersey; 4 counties in Connecticut

NWS New York, NY issued this frost advisory at Apr 20, 2013, 3:41 PM EDT for Suffolk County, New York; Union County, New Jersey; 4 counties in Connecticut. It took effect at Apr 21, 2013, 4:00 AM EDT. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: Apr 20, 2013, 3:41 PM EDT (19:41 UTC)
In effect from: Apr 21, 2013, 4:00 AM EDT
Expired: Apr 21, 2013, 6:05 AM EDT
In force: 2 hr
Issued by: NWS New York, NY

Counties Greater Bridgeport Planning Region, CT, Lower Connecticut River Valley Planning Region, CT, Naugatuck Valley Planning Region, CT, Southeastern Connecticut Planning Region, CT, Union County, NJ, Suffolk County, NY

The radar

The Brookhaven radar (KOKX), 41 km from the middle of the area, began a volume at 19:40 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

Chatham, MA (KCHH), launched 12:00Z, 7.7 hours before the alert went out and 256 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: 433 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS New York, NY wrote its last area forecast discussion before this frost advisory went out at Apr 20, 1:36 PM EDT, 2 hours 5 minutes earlier.

Area forecast discussion, Apr 20, 1:36 PM EDT, 2 hours 5 minutes before

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Hazardous weather outlook, Apr 20, 3:54 AM EDT, 11 hours 47 minutes before

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The office that day

Everything else NWS New York, NY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 19, 8:28 PM EDT	Severe Thunderstorm Warning	OKX	Orange	62 min
Apr 19, 9:29 PM EDT	Special Weather Statement	OKX	Orange, Putnam, Rockland	46 min
Apr 19, 10:14 PM EDT	Special Weather Statement	OKX	New York, Putnam, Rockland, Westchester	46 min
Apr 19, 10:44 PM EDT	Special Weather Statement	OKX	Bronx, Kings, Nassau, Queens, Richmond	31 min
Apr 19, 11:15 PM EDT	Severe Thunderstorm Warning	OKX	Suffolk	45 min
Apr 19, 11:16 PM EDT	Special Marine Warning	OKX		59 min
Apr 19, 11:22 PM EDT	Special Marine Warning	OKX		38 min
Apr 20, 12:05 AM EDT	Special Marine Warning	OKX		85 min
Apr 20, 12:16 AM EDT	Marine Dense Fog Advisory	OKX		4 hr
Apr 20, 3:47 AM EDT	Small Craft Advisory	OKX		30 hr
Apr 20, 3:41 PM EDT	Freeze Warning	OKX	Rockland, Westchester	14 hr
Apr 19, 11:37 PM EDT	Special Weather Statement	OKX		38 min

Nearby

Frost Advisories in Connecticut, 2013 Frost Advisories in New York, 2013 Frost Advisories in New Jersey, 2013 Every frost advisory in 2013

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.