Coastal Storm. Wednesday through Friday, 3/6-8/2013 Weather Briefing

Transcription

1 Coastal Storm Wednesday through Friday, 3/6-8/2013 Weather Briefing Prepared 2:00 PM EST Wednesday, March 6, 2013 National Weather Service New York, NY

2 Purpose of Briefing Promote Situational Awareness Provide Guidance for Planning Briefing Applies to Area Shaded in Blue

3 Overview Intense low pressure along the VA coast will move very slowly east tonight through Friday A potent upper level disturbance will merge with the offshore low Thursday night into Friday Strong Winds, Coastal Flooding, Beach Erosion, High Surf and Wet Snow expected 3

4 Forecast Changes Less Snowfall Starting off warmer, so expect a later change to snow and lower amounts of a slushy 1-2 for tonight Coastal Flooding Upgrade of watches to warnings/advisories for the high tide cycle late tonight into early Thursday morning 4

5 Current Forecast Hazards Winter Storm Warning Tonight through Friday Morning storm warning - New London and Eastern Suffolk Counties - Snowfall 2-4 through Thursday afternoon - Might be downgraded to advisory for total snowfall 5-8" Winter Weather Advisory Tonight through Thu Afternoon weather advisory - Coastal CT, Lower Hudson Valley, NYC Metro, Western/Central Long Island - Snowfall 2-3 through Thu afternoon - Advisory may be extended into Thu night-fri for an additional 2-4 5

6 Current Forecast Hazards Wind Advisory through Thursday Afternoon advisory - Coastal Regions of CT, NJ, NYC Metro and Long Island - Sustained northeast winds mph with gusts 45 to 55 mph 6

7 Current Forecast Hazards Coastal Flooding will impact Multiple High Tide Cycles For Late This Afternoon and This Evening: Coastal Flood WARNING - Westernmost LI Sound (Westchester, Bronx, N. Queens, N. Nassau) - Peconic/Gardiners Bays of Long Island Coastal Flood Advisories - SW Connecticut (Fairfield/New Haven) and NW Suffolk - NY Harbor and South Shore Bays of Nassau/W. Suffolk 7

8 Current Forecast Hazards For Late Tonight into Thursday Morning Might Issue Coastal Flood WARNING - Long Island South Shore Bays - Peconic/Gardiners Bays of Long Island Coastal Flood Advisories - Long Island Sound - NY Harbor 8

9 Current Marine Hazards Storm Warnings through Thu Afternoon Wind Gusts up to 50 knots on the ocean waters south of Long Island, Eastern Long Island and Peconic/Gardiners Bays Gale Warnings through Thu Afternoon Wind Gusts up to 45 Knots on Western Long Island Sound, NY Harbor and the Long Island South Shore Bays 9

10 Timing o Late this afternoon - Light rain occasionally mixed with sleet with E- NE winds mph with gusts to mph o Tonight Precipitation should change to Wet Accumulating Snow from NW to SE mainly through this evening, heaviest over eastern Long Island and Southeast CT as temperatures fall to with N-NE Winds mph gusting to mph o Thu Intermittent Light Snow; High Temperatures Mid/Upper 30s; North Winds mph; Gusts to 45 mph o Thu Night/Fri Occasional Light Snow with Light Accumulations; Temperatures mostly in the 30s National Weather Service New York, NY

11 Forecast Changes Total Snowfall 6 pm Wed 7 pm Fri Starting off warmer, so expect later change to snow tonight General 3-5 amounts likely in two rounds Tonight-early Thu morning Thu night-fri Some amounts over 6 still possible over New London County CT and on the LI Twin Forks near Montauk

12 Liquid Equivalent Precipitation 7am Wed 7 pm Fri

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