A strong low pressure system developed along the Middle Atlantic coast during the morning of Wednesday, March 7, 2018. The low tracked along the coast through the early morning hours on Thursday, March 8, 2018.
Every event with a place to put it; 9 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS OKX wrote it up.
A strong low pressure system developed along the Middle Atlantic coast during the morning of Wednesday, March 7, 2018. The low tracked along the coast through the early morning hours on Thursday, March 8, 2018. The storm brought heavy wet snow, strong gusty winds, and even some thundersnow across northeast New Jersey. Snowfall rates ranged from 1 to 3 inches per hour at times in the heaviest snow bands.
The local office's own words before the first event, 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 the first event at Mar 7, 1:23 AM EST, 37 minutes earlier.
Area Forecast Discussion
National Weather Service New York NY
123 AM EST Wed Mar 7 2018
.SYNOPSIS...
A storm system will impact the area tonight through Wednesday
night. High pressure slowly builds to the south and west Thursday
through Saturday. Another area of low pressure may impact the
region late Sunday into Monday.
&&
.NEAR TERM /UNTIL 6 AM THIS MORNING/...
The fcst remains on track. As low pressure approaches the area,
expecting chances of snow to increase through the night. Looks
like areas west of the Hudson River could see snow developing
by around midnight, and by daybreak, snow should spread at least
eastward through SW CT and Western LI. Boundary layer
temperatures will marginally support a mix of rain and snow in
the city and adjacent areas at the onset, but with the expected
freezing level and wet-bulb zero heights, any rain in the mix
would likely be brief. Will go with the mention of all snow for
this period for now.
&&
.SHORT TERM /6 AM THIS MORNING THROUGH 6 PM THURSDAY/...
Low pressure to our west redevelops near the Mid-Atlantic coast and
moves NE, passing within Montauk late Wednesday night. The track of
the storm and PCPN amounts will be influenced in part by the timing
of when the 500mb low closes off to our south. At that point the
PCPN shield would expand NW from the center of the storm but
typically with a relatively sharp gradient from the axis of where
the heaviest PCPN amounts are to points N and W of it. The overall
trend has been for the upper low to close off sooner than what
models have shown yesterday, thus a consensus of the surface low
tracking closer to the coast.
With the storm tracking so close to us along with surface E-ENE
winds lasting at least into a portion of the afternoon, whether it
be boundary layer temps or temps aloft, what starts out as snow
therefore mixes with rain over coastal areas mainly Weds
aftn/evening. Parts of LI and SE CT even see a total changeover to
rain for some of the time. Wherever mixed rain and snow occurs,
there could be brief periods of sleet mixed in as well.
The heaviest PCPN falls during the afternoon to early evening hours
when snowfall rates of at least 1-2 inches per hour could occur.
PCPN should then end everywhere by daybreak on Thursday.
The track of the 700mb low and related dry-slot presents a challenge
to the QPF/snow totals. Fairly confident that it tracks somewhere
over the eastern half of the the tri-state area, so QPF totals have
been lowered more noticeably from the previous forecast in these
areas. Frontogenetic banding would most likely enhance QPF/snow
totals over the Lower Hudson Valley/NW zones.
Most of the warnings have been maintained with some areas downgraded
to an advisory. The only area without a winter weather headline
is Southeastern Suffolk County, however will go with a wind
advisory here for the day into early evening. This will be in
association with a low level jet passing through. Gusts 45-50
mph are expected.
&&
.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
The long term will be characterized by a continued blocking pattern
over the Northern Hemisphere. Cyclonic flow over the region through
Friday may lead to isolated rain/snow showers in a cool and mostly
cloudy regime. Model solutions differ in handling multiple pieces of
500 mb shortwave energy rotating on the backside of the departing
low into Saturday.
High pressure will then build to the south and west during the day
on Saturday as the upper low moves off the New England coast.
Despite the latest few runs backing off the next potential storm
system, did not want to go completely dry for the latter half of the
weekend into early next week as confidence in a suppressed solution
is low at this time.
Temperatures will average several degrees below normal through early
next week.
&&
.AVIATION /06Z WEDNESDAY THROUGH SUNDAY/...
***HIGH IMPACT WINTER STORM INTO TONIGHT***
Low pressure will develop along the Mid Atlantic coast tonight
and rapidly deepen as it passes southeast and then east of
Montauk Point tonight.
Occasional light snow with MVFR/IFR vsby expected to move in
overnight. Steady snow with IFR conds expected to arrive by
12Z-13Z to the NYC metro terminals and spread northeast
thereafter, but may take til late morning to arrive at KGON.
LIFR visibilities likely in moderate to heavy snow during the
day from KLGA north/west. A rain/snow mix is likely to develop
across Long Island and could work its way into the NYC metro
and southern Connecticut terminals in the afternoon and evening.
Precipitation should end as all snow in the evening.
Total snow accumulation across city terminals may vary due to
increasing potential for a mix with rain in the afternoon.
Highest confidence in precipitation type remaining all snow is
for the interior terminals (KHPN and KSWF). Snowfall rates 1-2
inches per hour are likely, with the longest duration of these
higher rates for the inland terminals.
A pocket of elevated instability moving across north of the
intensifying low will bring a chance of thunder/graupel from NYC
metro east in the afternoon and early evening.
E winds around or just over 10 kt will gradually increase
overnight. ENE winds on Wednesday become increasingly gusty,
especially along the coast in the late morning and afternoon,
and may gust to 30-40 kt near the coast by late afternoon,
highest east.
Forecast snowfall amounts:
.KHPN/KSWF...10-15 inches
.KLGA/KEWR/KTEB...6-10 inches
.KJFK/KISP/KBDR/KGON...3-5 inches
.OUTLOOK FOR 06Z THURSDAY THROUGH SUNDAY...
.Late Wednesday night...Gradually improving conditions.
Diminishing winds.
.Thursday...VFR. W G20KT daytime.
.Friday...VFR. W-NW winds G20-25KT daytime.
.Saturday...VFR. W-NW winds G20KT.
.Sunday...Mainly VFR.
&&
.MARINE...
Sub-SCA winds tonight will increase Wednesday with the approach of
the coastal storm. Easterly winds will rapidly increase Wednesday to
gales for all waters by the afternoon with maximum gusts across
eastern ocean and Eastern Long Island, where wind gusts will reach
up to near 45 kt. Gales last into Wed evening for most waters but
will be more marginal for Western Long Island Sound and NY Harbor.
Winds subside overnight into Thursday to less than gale but gusts up
to 30 kt still expected with cold air advection late.
Regarding seas, they will remain elevated above 5 ft for the ocean
through Wednesday night. Long Island Sound too will likely reach SCA
for seas, reaching 5 to 6 ft Wednesday afternoon into Wednesday
evening with easterly fetch.
Low pressure continues to move away Thursday into Thursday night.
However there will be a prolonged period of Small Craft conditions
on the ocean waters as gusts remain around 20-30 kt with seas above
5 ft. Conditions will fall below SCA criteria on Sunday. Another
coastal low looks to impact the coastal waters Sunday into Monday
with SCA winds likely.
&&
.HYDROLOGY...
A significant precipitation event of 0.75 to 1.5 inches of liquid
equivalent is expected tonight through Wednesday night. No adverse
hydrologic impacts are anticipated - even in areas where the
precipitation falls in the form of rain.
&&
.TIDES/COASTAL FLOODING...
Long period easterly swells have maintained elevated waters
levels across the region, particularly along the southern bays
of LI and Queens. As a result, widespread minor coastal
flooding is expected along the vulnerable south shore bays of
SW Suffolk, Nassau and Southern Queens with tonight's high tide.
Developing gale force winds with an approaching coastal storm
on Wednesday is expected to cause widespread minor to locally
moderate coastal flooding around the times of high tide
Wednesday afternoon. Due to mentioned high tidal anomaly, there
widespread moderate coastal flooding is expected along the
southern bays of Western LI and Jamaica Bay. Gale force
easterly winds down the LI sound are expected to generate 3 to 6
ft seas, which will likely result in localized moderate impacts
along the western LI shoreline. Some damage to shoreline
structures is possible.
Winds shift to the NW for the late Wednesday night/early
Thursday morning high tide which should have water levels
subsiding, but residual surge and long period easterly swells
will likely maintain minor flooding impacts along the southern
and eastern bays of LI, Eastern LI Sound, and Jamaica Bay.
&&
.EQUIPMENT...
NYC NOAA Weather Radio Station KWO-35 (162.55 MHz) is off the
air for an extended period of time.
&&
.OKX WATCHES/WARNINGS/ADVISORIES...
CT...Winter Weather Advisory until 4 AM EST Thursday for CTZ011-012.
Coastal Flood Advisory from noon today to 5 PM EST this
afternoon for CTZ011-012.
Coastal Flood Advisory from midnight tonight to 6 AM EST
Thursday for CTZ011-012.
Winter Storm Warning until 4 AM EST Thursday for CTZ005>010.
Coastal Flood Advisory from 2 PM to 5 PM EST this afternoon
for CTZ009-010.
NY...Winter Weather Advisory until 4 AM EST Thursday for NYZ078>080-
178-179.
Coastal Flood Advisory from noon today to 5 PM EST this
afternoon for NYZ079-081.
Coastal Flood Advisory from midnight tonight to 6 AM EST
Thursday for NYZ079>081-178-179.
Winter Storm Warning until 4 AM EST Thursday for NYZ067>075-
176-177.
Coastal Flood Advisory from 11 AM this morning to 2 PM EST
this afternoon for NYZ074-075.
Coastal Flood Advisory from 2 PM to 5 PM EST this afternoon
for NYZ071-073-078-176-177.
Coastal Flood Warning from 11 AM this morning to 4 PM EST this
afternoon for NYZ080-178-179.
Coastal Flood Advisory until 3 AM EST early this morning for
NYZ080-178-179.
Wind Advisory from 10 AM this morning to 8 PM EST this evening
for NYZ081.
NJ...Winter Storm Warning until 4 AM EST Thursday for NJZ002-004-
006-103>108.
Coastal Flood Advisory from 11 AM this morning to 2 PM EST
this afternoon for NJZ006-106-108.
MARINE...Gale Warning from 6 AM this morning to midnight EST tonight
for ANZ330-340-345-350-353-355.
Gale Warning from 6 AM this morning to 6 PM EST this evening
for ANZ335-338.
Small Craft Advisory until 6 AM EST early this morning for
ANZ350-353-355.
&&
SYNOPSIS...CB/JC
NEAR TERM...JMC/JC
SHORT TERM...JC
LONG TERM...CB
AVIATION...Goodman
MARINE...CB/JM
HYDROLOGY...CB/JC
TIDES/COASTAL FLOODING...
EQUIPMENT...Hazardous Weather Outlook National Weather Service New York NY 355 PM EST Tue Mar 6 2018 CTZ005>008-NJZ002-004-103>105-107-NYZ067>070-072-071100- Northern Fairfield-Northern New Haven-Northern Middlesex- Northern New London-Western Passaic-Eastern Passaic-Western Bergen- Eastern Bergen-Western Essex-Western Union-Orange-Putnam-Rockland- Northern Westchester-New York (Manhattan)- 355 PM EST Tue Mar 6 2018 ...WINTER STORM WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 4 AM EST THURSDAY... This Hazardous Weather Outlook is for southern Connecticut, northeast New Jersey and southeast New York. .DAY ONE...This Afternoon and Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Winter Storm Warning. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Winter Storm Warning. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. && This Hazardous Weather Outlook provides a summary of potential widespread hazardous weather events that may reach NWS warning criteria. Most long fused NWS watches...warnings and advisories in effect are highlighted. Please refer to the latest NWS forecasts for weather not meeting NWS warning criteria. NJZ006-106-108-NYZ074-075-071100- Hudson-Eastern Essex-Eastern Union-Richmond (Staten Island)- Kings (Brooklyn)- 355 PM EST Tue Mar 6 2018 ...WINTER STORM WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 4 AM EST THURSDAY... ...COASTAL FLOOD ADVISORY IN EFFECT FROM 11 AM TO 2 PM EST WEDNESDAY... This Hazardous Weather Outlook is for northeast New Jersey and southeast New York. .DAY ONE...This Afternoon and Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Winter Storm Warning. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Winter Storm Warning. Coastal Flood Advisory. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. && This Hazardous Weather Outlook provides a summary of potential widespread hazardous weather events that may reach NWS warning criteria. Most long fused NWS watches...warnings and advisories in effect are highlighted. Please refer to the latest NWS forecasts for weather not meeting NWS warning criteria. CTZ009-010-NYZ071-073-176-177-071100- Southern Fairfield-Southern New Haven-Southern Westchester-Bronx- Northern Queens-Northern Nassau- 355 PM EST Tue Mar 6 2018 ...WINTER STORM WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 4 AM EST THURSDAY... ...COASTAL FLOOD ADVISORY IN EFFECT FROM 2 PM TO 5 PM EST WEDNESDAY... This Hazardous Weather Outlook is for southern Connecticut and southeast New York. .DAY ONE...This Afternoon and Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Winter Storm Warning. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Winter Storm Warning. Coastal Flood Advisory. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. && This Hazardous Weather Outlook provides a summary of potential widespread hazardous weather events that may reach NWS warning criteria. Most long fused NWS watches...warnings and advisories in effect are highlighted. Please refer to the latest NWS forecasts for weather not meeting NWS warning criteria. NYZ080-178-179-071100- Southwestern Suffolk-Southern Queens-Southern Nassau- 355 PM EST Tue Mar 6 2018 ...COASTAL FLOOD ADVISORY IN EFFECT FROM 11 PM THIS EVENING TO 3 AM EST WEDNESDAY... ...WINTER WEATHER ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 4 AM EST THURSDAY... ...COASTAL FLOOD WARNING IN EFFECT FROM 11 AM TO 4 PM EST WEDNESDAY... ...COASTAL FLOOD ADVISORY IN EFFECT FROM MIDNIGHT WEDNESDAY NIGHT TO 6 AM EST THURSDAY... This Hazardous Weather Outlook is for southeast New York. .DAY ONE...This Afternoon and Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Coastal Flood Advisory. Winter Weather Advisory. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Winter Weather Advisory. Coastal Flood Warning. Coastal Flood Advisory. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. && This Hazardous Weather Outlook provides a summary of potential widespread hazardous weather events that may reach NWS warning criteria. Most long fused NWS watches...warnings and advisories in effect are highlighted. Please refer to the latest NWS forecasts for weather not meeting NWS warning criteria. CTZ011-012-NYZ079-071100- Southern Middlesex-Southern New London-Northeastern Suffolk- 355 PM EST Tue Mar 6 2018 ...WINTER WEATHER ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 4 AM EST THURSDAY... ...COASTAL FLOOD ADVISORY IN EFFECT FROM NOON TO 5 PM EST WEDNESDAY... ...COASTAL FLOOD ADVISORY IN EFFECT FROM MIDNIGHT WEDNESDAY NIGHT TO 6 AM EST THURSDAY... This Hazardous Weather Outlook is for southern Connecticut and southeast New York. .DAY ONE...This Afternoon and Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Winter Weather Advisory. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Winter Weather Advisory. Coastal Flood Advisory. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. && This Hazardous Weather Outlook provides a summary of potential widespread hazardous weather events that may reach NWS warning criteria. Most long fused NWS watches...warnings and advisories in effect are highlighted. Please refer to the latest NWS forecasts for weather not meeting NWS warning criteria. NYZ078-071100- Northwestern Suffolk- 355 PM EST Tue Mar 6 2018 ...WINTER WEATHER ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 4 AM EST THURSDAY... ...COASTAL FLOOD ADVISORY IN EFFECT FROM 2 PM TO 5 PM EST WEDNESDAY... This Hazardous Weather Outlook is for southeast New York. .DAY ONE...This Afternoon and Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Winter Weather Advisory. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Winter Weather Advisory. Coastal Flood Advisory. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. && This Hazardous Weather Outlook provides a summary of potential widespread hazardous weather events that may reach NWS warning criteria. Most long fused NWS watches...warnings and advisories in effect are highlighted. Please refer to the latest NWS forecasts for weather not meeting NWS warning criteria. NYZ081-071100- Southeastern Suffolk- 355 PM EST Tue Mar 6 2018 ...WIND ADVISORY IN EFFECT FROM 10 AM TO 8 PM EST WEDNESDAY... ...COASTAL FLOOD ADVISORY IN EFFECT FROM NOON TO 5 PM EST WEDNESDAY... ...COASTAL FLOOD ADVISORY IN EFFECT FROM MIDNIGHT WEDNESDAY NIGHT TO 6 AM EST THURSDAY... This Hazardous Weather Outlook is for southeast New York. .DAY ONE...This Afternoon and Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Wind Advisory. Coastal Flood Advisory. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. && This Hazardous Weather Outlook provides a summary of potential widespread hazardous weather events that may reach NWS warning criteria. Most long fused NWS watches...warnings and advisories in effect are highlighted. Please refer to the latest NWS forecasts for weather not meeting NWS warning criteria. ANZ330-340-345-350-353-355-071100- Long Island Sound East of New Haven CT/Port Jefferson NY- Peconic and Gardiners Bays- South Shore Bays from Jones Inlet through Shinnecock Bay- Moriches Inlet NY to Montauk Point NY out 20 nm- Fire Island Inlet NY to Moriches Inlet NY out 20 nm- Sandy Hook NJ to Fire Island Inlet NY out 20 nm- 355 PM EST Tue Mar 6 2018 ...GALE WARNING IN EFFECT FROM 6 AM WEDNESDAY TO MIDNIGHT EST WEDNESDAY NIGHT... This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...This Afternoon and Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Gale Warning. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. && This Hazardous Weather Outlook provides a summary of potential widespread hazardous weather events that may reach NWS warning criteria. Most long fused NWS watches...warnings and advisories in effect are highlighted. Please refer to the latest NWS forecasts for weather not meeting NWS warning criteria. ANZ335-338-071100- Long Island Sound West of New Haven CT/Port Jefferson NY- New York Harbor- 355 PM EST Tue Mar 6 2018 ...GALE WARNING IN EFFECT FROM 6 AM TO 6 PM EST WEDNESDAY... This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...This Afternoon and Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Gale Warning. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. && This Hazardous Weather Outlook provides a summary of potential widespread hazardous weather events that may reach NWS warning criteria. Most long fused NWS watches...warnings and advisories in effect are highlighted. Please refer to the latest NWS forecasts for weather not meeting NWS warning criteria.
The national radar mosaic for the moment the first event began.
8 winter storm, 1 winter weather. Local standard time, as filed.
CoCoRaHS observers and trained spotters reported 11 to 20 inches of snowfall. Significant tree damage was reported across eastern Passaic county due to heavy wet snow and strong winds.
Trained spotters reported 19 to 22 inches of snowfall. Significant tree damage was reported across western Passaic county due to heavy wet snow and strong winds.
Trained spotters reported 7 to 9 inches of snowfall. Strong winds brought down power lines, which were on fire closing Bergen Boulevard.
Trained spotters and CoCoRaHS observers reported 1 to 2 feet of snowfall. The highest totals occurred in Oakland and Mahwah with 26 and 18.4 inches respectively. In Ho-Ho-Kus, a large tree snapped from the weight of the heavy snow taking down major power lines at the intersection of Hollywood Avenue and Sheridan Avenue.
Trained spotters and the public reported 1 to 2 feet of snow. 23.0 inches was reported in North Caldwell and 19.7 inches in Roseland. The heavy wet snow and strong winds also brought down trees and some power lines.
CoCoRaHS and trained spotters reported 6 to 10 inches of snow. Trees and power lines were also downed due to heavy wet snow and strong winds.
Trained spotters and CoCoRaHS observers reported 7 to 9 inches of snowfall. Numerous downed trees and power lines occurred in Fanwood.
The FAA Contract Observer at Newark-Liberty International Airport reported 4.6 inches of snow.
Trained spotters and the public reported 6 inches of snowfall. Strong winds in combination with heavy, wet snow also brought down tree limbs and a few power lines.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New Jersey in 2018Every state in 2018This day in weather historyWarnings in New Jersey, March 2018
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 744259, 744260, 744262, 744263, 744265, 744267, 744268, 744270, 744258.