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Hydrograph River at a Glance Download
Merrimack River at Lowell Stage (ft)Flow (kcfs)Highest Observation: 47.6 ft at 11:45PM Mar 15, 2024Observed: 47.59 ft at 12:00AM Mar 16, 2024Observed: 47.59 ft at 12:15AM Mar 16, 2024Observed: 47.58 ft at 12:30AM Mar 16, 2024Observed: 47.58 ft at 12:45AM Mar 16, 2024Observed: 47.58 ft at 1:00AM Mar 16, 2024Observed: 47.57 ft at 1:15AM Mar 16, 2024Observed: 47.57 ft at 1:30AM Mar 16, 2024Observed: 47.57 ft at 1:45AM Mar 16, 2024Observed: 47.57 ft at 2:00AM Mar 16, 2024Observed: 47.57 ft at 2:15AM Mar 16, 2024Observed: 47.56 ft at 2:30AM Mar 16, 2024Observed: 47.57 ft at 2:45AM Mar 16, 2024Observed: 47.56 ft at 3:00AM Mar 16, 2024Observed: 47.56 ft at 3:15AM Mar 16, 2024Observed: 47.55 ft at 3:30AM Mar 16, 2024Observed: 47.55 ft at 3:45AM Mar 16, 2024Observed: 47.55 ft at 4:00AM Mar 16, 2024Observed: 47.55 ft at 4:15AM Mar 16, 2024Observed: 47.54 ft at 4:30AM Mar 16, 2024Observed: 47.54 ft at 4:45AM Mar 16, 2024Observed: 47.54 ft at 5:00AM Mar 16, 2024Observed: 47.54 ft at 5:15AM Mar 16, 2024Observed: 47.53 ft at 5:30AM Mar 16, 2024Observed: 47.53 ft at 5:45AM Mar 16, 2024Observed: 47.53 ft at 6:00AM Mar 16, 2024Observed: 47.53 ft at 6:15AM Mar 16, 2024Observed: 47.52 ft at 6:30AM Mar 16, 2024Observed: 47.53 ft at 6:45AM Mar 16, 2024Observed: 47.53 ft at 7:00AM Mar 16, 2024Observed: 47.53 ft at 7:15AM Mar 16, 2024Observed: 47.52 ft at 7:30AM Mar 16, 2024Observed: 47.51 ft at 7:45AM Mar 16, 2024Observed: 47.51 ft at 8:00AM Mar 16, 2024Observed: 47.51 ft at 8:15AM Mar 16, 2024Observed: 47.5 ft at 8:30AM Mar 16, 2024Observed: 47.5 ft at 8:31AM Mar 16, 2024Observed: 47.5 ft at 8:45AM Mar 16, 2024Observed: 47.5 ft at 9:00AM Mar 16, 2024Observed: 47.5 ft at 9:15AM Mar 16, 2024Observed: 47.5 ft at 9:30AM Mar 16, 2024Observed: 47.5 ft at 9:45AM Mar 16, 2024Observed: 47.49 ft at 10:00AM Mar 16, 2024Observed: 47.49 ft at 10:15AM Mar 16, 2024Observed: 47.49 ft at 10:30AM Mar 16, 2024Observed: 47.49 ft at 10:45AM Mar 16, 2024Observed: 47.49 ft at 11:00AM Mar 16, 2024Observed: 47.49 ft at 11:15AM Mar 16, 2024Observed: 47.49 ft at 11:30AM Mar 16, 2024Observed: 47.49 ft at 11:45AM Mar 16, 2024Observed: 47.5 ft at 12:00PM Mar 16, 2024Observed: 47.5 ft at 12:15PM Mar 16, 2024Observed: 47.51 ft at 12:30PM Mar 16, 2024Observed: 47.5 ft at 12:45PM Mar 16, 2024Observed: 47.5 ft at 1:00PM Mar 16, 2024Observed: 47.51 ft at 1:15PM Mar 16, 2024Observed: 47.51 ft at 1:30PM Mar 16, 2024Observed: 47.52 ft at 1:45PM Mar 16, 2024Observed: 47.52 ft at 2:00PM Mar 16, 2024Observed: 47.53 ft at 2:15PM Mar 16, 2024Observed: 47.54 ft at 2:30PM Mar 16, 2024Observed: 47.54 ft at 2:31PM Mar 16, 2024Observed: 47.53 ft at 2:45PM Mar 16, 2024Observed: 47.53 ft at 3:00PM Mar 16, 2024Observed: 47.53 ft at 3:15PM Mar 16, 2024Observed: 47.53 ft at 3:30PM Mar 16, 2024Observed: 47.53 ft at 3:45PM Mar 16, 2024Observed: 47.52 ft at 4:00PM Mar 16, 2024Observed: 47.52 ft at 4:15PM Mar 16, 2024Observed: 47.52 ft at 4:30PM Mar 16, 2024Observed: 47.53 ft at 4:45PM Mar 16, 2024Observed: 47.53 ft at 5:00PM Mar 16, 2024Observed: 47.53 ft at 5:15PM Mar 16, 2024Observed: 47.53 ft at 5:30PM Mar 16, 2024Observed: 47.52 ft at 5:45PM Mar 16, 2024Observed: 47.52 ft at 6:00PM Mar 16, 2024Observed: 47.52 ft at 6:15PM Mar 16, 2024Observed: 47.53 ft at 6:30PM Mar 16, 2024Observed: 47.54 ft at 6:45PM Mar 16, 2024Observed: 47.53 ft at 7:00PM Mar 16, 2024Observed: 47.53 ft at 7:15PM Mar 16, 2024Observed: 47.53 ft at 7:30PM Mar 16, 2024Observed: 47.54 ft at 7:45PM Mar 16, 2024Observed: 47.55 ft at 8:00PM Mar 16, 2024Observed: 47.55 ft at 8:15PM Mar 16, 2024Observed: 47.55 ft at 8:30PM Mar 16, 2024Observed: 47.55 ft at 8:45PM Mar 16, 2024Observed: 47.55 ft at 9:00PM Mar 16, 2024Observed: 47.55 ft at 9:15PM Mar 16, 2024Observed: 47.55 ft at 9:30PM Mar 16, 2024Observed: 47.55 ft at 9:45PM Mar 16, 2024Observed: 47.55 ft at 10:00PM Mar 16, 2024Observed: 47.55 ft at 10:15PM Mar 16, 2024Observed: 47.56 ft at 10:30PM Mar 16, 2024Observed: 47.55 ft at 10:45PM Mar 16, 2024Observed: 47.55 ft at 11:00PM Mar 16, 2024Observed: 47.56 ft at 11:15PM Mar 16, 2024Observed: 47.55 ft at 11:30PM Mar 16, 2024Observed: 47.55 ft at 11:45PM Mar 16, 2024Observed: 47.55 ft at 12:00AM Mar 17, 2024Observed: 47.55 ft at 12:15AM Mar 17, 2024Observed: 47.55 ft at 12:30AM Mar 17, 2024Observed: 47.55 ft at 12:45AM Mar 17, 2024Observed: 47.55 ft at 1:00AM Mar 17, 2024Observed: 47.55 ft at 1:15AM Mar 17, 2024Observed: 47.55 ft at 1:30AM Mar 17, 2024Observed: 47.55 ft at 1:45AM Mar 17, 2024Observed: 47.55 ft at 2:00AM Mar 17, 2024Observed: 47.54 ft at 2:15AM Mar 17, 2024Observed: 47.54 ft at 2:30AM Mar 17, 2024Observed: 47.54 ft at 2:45AM Mar 17, 2024Observed: 47.54 ft at 3:00AM Mar 17, 2024Observed: 47.54 ft at 3:15AM Mar 17, 2024Observed: 47.53 ft at 3:30AM Mar 17, 2024Observed: 47.52 ft at 3:45AM Mar 17, 2024Observed: 47.52 ft at 4:00AM Mar 17, 2024Observed: 47.52 ft at 4:15AM Mar 17, 2024Observed: 47.53 ft at 4:30AM Mar 17, 2024Observed: 47.52 ft at 4:45AM Mar 17, 2024Observed: 47.52 ft at 5:00AM Mar 17, 2024Observed: 47.51 ft at 5:15AM Mar 17, 2024Observed: 47.51 ft at 5:30AM Mar 17, 2024Observed: 47.51 ft at 5:45AM Mar 17, 2024Observed: 47.5 ft at 6:00AM Mar 17, 2024Observed: 47.49 ft at 6:15AM Mar 17, 2024Observed: 47.49 ft at 6:30AM Mar 17, 2024Observed: 47.49 ft at 6:45AM Mar 17, 2024Observed: 47.49 ft at 7:00AM Mar 17, 2024Observed: 47.49 ft at 7:15AM Mar 17, 2024Observed: 47.48 ft at 7:30AM Mar 17, 2024Observed: 47.48 ft at 7:45AM Mar 17, 2024Observed: 47.49 ft at 8:00AM Mar 17, 2024Observed: 47.49 ft at 8:15AM Mar 17, 2024Observed: 47.48 ft at 8:30AM Mar 17, 2024Observed: 47.46 ft at 8:45AM Mar 17, 2024Observed: 47.46 ft at 9:00AM Mar 17, 2024Observed: 47.46 ft at 9:15AM Mar 17, 2024Observed: 47.45 ft at 9:30AM Mar 17, 2024Observed: 47.45 ft at 9:45AM Mar 17, 2024Observed: 47.44 ft at 10:00AM Mar 17, 2024Observed: 47.44 ft at 10:15AM Mar 17, 2024Observed: 47.44 ft at 10:30AM Mar 17, 2024Observed: 47.44 ft at 10:45AM Mar 17, 2024Observed: 47.44 ft at 11:00AM Mar 17, 2024Observed: 47.44 ft at 11:15AM Mar 17, 2024Observed: 47.44 ft at 11:30AM Mar 17, 2024Observed: 47.43 ft at 11:45AM Mar 17, 2024Observed: 47.42 ft at 12:00PM Mar 17, 2024Observed: 47.42 ft at 12:15PM Mar 17, 2024Observed: 47.44 ft at 12:30PM Mar 17, 2024Observed: 47.44 ft at 12:45PM Mar 17, 2024Observed: 47.44 ft at 1:00PM Mar 17, 2024Observed: 47.43 ft at 1:15PM Mar 17, 2024Observed: 47.43 ft at 1:30PM Mar 17, 2024Observed: 47.43 ft at 1:45PM Mar 17, 2024Observed: 47.42 ft at 2:00PM Mar 17, 2024Observed: 47.41 ft at 2:15PM Mar 17, 2024Observed: 47.4 ft at 2:30PM Mar 17, 2024Observed: 47.4 ft at 2:45PM Mar 17, 2024Observed: 47.4 ft at 2:46PM Mar 17, 2024Observed: 47.4 ft at 3:00PM Mar 17, 2024Observed: 47.42 ft at 3:15PM Mar 17, 2024Observed: 47.42 ft at 3:30PM Mar 17, 2024Observed: 47.42 ft at 3:45PM Mar 17, 2024Observed: 47.42 ft at 4:00PM Mar 17, 2024Observed: 47.44 ft at 4:15PM Mar 17, 2024Observed: 47.41 ft at 4:30PM Mar 17, 2024Observed: 47.37 ft at 4:45PM Mar 17, 2024Observed: 47.36 ft at 5:00PM Mar 17, 2024Observed: 47.36 ft at 5:15PM Mar 17, 2024Observed: 47.38 ft at 5:30PM Mar 17, 2024Observed: 47.39 ft at 5:45PM Mar 17, 2024Observed: 47.39 ft at 6:00PM Mar 17, 2024Observed: 47.37 ft at 6:15PM Mar 17, 2024Observed: 47.36 ft at 6:30PM Mar 17, 2024Observed: 47.37 ft at 6:45PM Mar 17, 2024Observed: 47.37 ft at 7:00PM Mar 17, 2024Observed: 47.37 ft at 7:15PM Mar 17, 2024Observed: 47.37 ft at 7:30PM Mar 17, 2024Observed: 47.36 ft at 7:45PM Mar 17, 2024Observed: 47.36 ft at 8:00PM Mar 17, 2024Observed: 47.35 ft at 8:15PM Mar 17, 2024Observed: 47.34 ft at 8:30PM Mar 17, 2024Observed: 47.34 ft at 8:45PM Mar 17, 2024Observed: 47.34 ft at 8:46PM Mar 17, 2024Observed: 47.34 ft at 9:00PM Mar 17, 2024Observed: 47.33 ft at 9:15PM Mar 17, 2024Observed: 47.33 ft at 9:30PM Mar 17, 2024Observed: 47.32 ft at 9:45PM Mar 17, 2024Observed: 47.31 ft at 10:00PM Mar 17, 2024Observed: 47.31 ft at 10:15PM Mar 17, 2024Observed: 47.3 ft at 10:30PM Mar 17, 2024Observed: 47.29 ft at 10:45PM Mar 17, 2024Observed: 47.29 ft at 11:00PM Mar 17, 2024Observed: 47.29 ft at 11:15PM Mar 17, 2024Observed: 47.28 ft at 11:30PM Mar 17, 2024Observed: 47.28 ft at 11:45PM Mar 17, 2024Observed: 47.27 ft at 12:00AM Mar 18, 2024Observed: 47.27 ft at 12:15AM Mar 18, 2024Observed: 47.26 ft at 12:30AM Mar 18, 2024Observed: 47.26 ft at 12:45AM Mar 18, 2024Observed: 47.26 ft at 1:00AM Mar 18, 2024Observed: 47.25 ft at 1:15AM Mar 18, 2024Observed: 47.24 ft at 1:30AM Mar 18, 2024Observed: 47.23 ft at 1:45AM Mar 18, 2024Observed: 47.23 ft at 2:00AM Mar 18, 2024Observed: 47.22 ft at 2:15AM Mar 18, 2024Observed: 47.21 ft at 2:30AM Mar 18, 2024Observed: 47.21 ft at 2:45AM Mar 18, 2024Observed: 47.21 ft at 2:47AM Mar 18, 2024Observed: 47.2 ft at 3:00AM Mar 18, 2024Observed: 47.2 ft at 3:15AM Mar 18, 2024Observed: 47.2 ft at 3:30AM Mar 18, 2024Observed: 47.19 ft at 3:45AM Mar 18, 2024Observed: 47.18 ft at 4:00AM Mar 18, 2024Observed: 47.17 ft at 4:15AM Mar 18, 2024Observed: 47.16 ft at 4:30AM Mar 18, 2024Observed: 47.16 ft at 4:45AM Mar 18, 2024Observed: 47.16 ft at 5:00AM Mar 18, 2024Observed: 47.15 ft at 5:15AM Mar 18, 2024Observed: 47.15 ft at 5:30AM Mar 18, 2024Observed: 47.14 ft at 5:45AM Mar 18, 2024Observed: 47.13 ft at 6:00AM Mar 18, 2024Observed: 47.12 ft at 6:15AM Mar 18, 2024Observed: 47.12 ft at 6:30AM Mar 18, 2024Observed: 47.11 ft at 6:45AM Mar 18, 2024Observed: 47.11 ft at 7:00AM Mar 18, 2024Observed: 47.1 ft at 7:15AM Mar 18, 2024Observed: 47.1 ft at 7:30AM Mar 18, 2024Observed: 47.09 ft at 7:45AM Mar 18, 2024Observed: 47.08 ft at 8:00AM Mar 18, 2024Observed: 47.08 ft at 8:15AM Mar 18, 2024Observed: 47.08 ft at 8:30AM Mar 18, 2024Observed: 47.08 ft at 8:45AM Mar 18, 2024Observed: 47.08 ft at 8:47AM Mar 18, 2024Observed: 47.07 ft at 9:00AM Mar 18, 2024Observed: 47.07 ft at 9:15AM Mar 18, 2024Observed: 47.07 ft at 9:30AM Mar 18, 2024Observed: 47.07 ft at 9:45AM Mar 18, 2024Observed: 47.07 ft at 10:00AM Mar 18, 2024Observed: 47.05 ft at 10:15AM Mar 18, 2024Observed: 47.05 ft at 10:30AM Mar 18, 2024Observed: 47.03 ft at 10:45AM Mar 18, 2024Observed: 47.03 ft at 11:00AM Mar 18, 2024Observed: 47.03 ft at 11:15AM Mar 18, 2024Observed: 47.03 ft at 11:30AM Mar 18, 2024Observed: 47.03 ft at 11:45AM Mar 18, 2024Observed: 47.02 ft at 12:00PM Mar 18, 2024Observed: 47 ft at 12:15PM Mar 18, 2024Observed: 46.98 ft at 12:30PM Mar 18, 2024Observed: 46.97 ft at 12:45PM Mar 18, 2024Observed: 46.97 ft at 1:00PM Mar 18, 2024Observed: 46.96 ft at 1:15PM Mar 18, 2024Observed: 46.97 ft at 1:30PM Mar 18, 2024Observed: 46.97 ft at 1:45PM Mar 18, 2024Observed: 46.98 ft at 2:00PM Mar 18, 2024Observed: 46.97 ft at 2:15PM Mar 18, 2024Observed: 46.96 ft at 2:30PM Mar 18, 2024Observed: 46.95 ft at 2:45PM Mar 18, 2024Observed: 46.95 ft at 2:46PM Mar 18, 2024Observed: 46.94 ft at 3:00PM Mar 18, 2024Observed: 46.93 ft at 3:15PM Mar 18, 2024Observed: 46.92 ft at 3:30PM Mar 18, 2024Observed: 46.92 ft at 3:45PM Mar 18, 2024Observed: 46.92 ft at 4:00PM Mar 18, 2024Observed: 46.91 ft at 4:15PM Mar 18, 2024Observed: 46.91 ft at 4:30PM Mar 18, 2024Observed: 46.91 ft at 4:45PM Mar 18, 2024Observed: 46.9 ft at 5:00PM Mar 18, 2024Observed: 46.9 ft at 5:15PM Mar 18, 2024Observed: 46.9 ft at 5:30PM Mar 18, 2024Observed: 46.9 ft at 5:45PM Mar 18, 2024Observed: 46.9 ft at 6:00PM Mar 18, 2024Observed: 46.89 ft at 6:15PM Mar 18, 2024Observed: 46.9 ft at 6:30PM Mar 18, 2024Observed: 46.89 ft at 6:45PM Mar 18, 2024Observed: 46.89 ft at 7:00PM Mar 18, 2024Observed: 46.89 ft at 7:15PM Mar 18, 2024Observed: 46.88 ft at 7:30PM Mar 18, 2024Observed: 46.86 ft at 7:45PM Mar 18, 2024Observed: 46.84 ft at 8:00PM Mar 18, 2024Observed: 46.83 ft at 8:15PM Mar 18, 2024Observed: 46.83 ft at 8:30PM Mar 18, 2024Observed: 46.83 ft at 8:45PM Mar 18, 2024Observed: 46.83 ft at 8:46PM Mar 18, 2024Observed: 46.84 ft at 9:00PM Mar 18, 2024Observed: 46.85 ft at 9:15PM Mar 18, 2024Observed: 46.84 ft at 9:30PM Mar 18, 2024Observed: 46.83 ft at 9:45PM Mar 18, 2024Observed: 46.82 ft at 10:00PM Mar 18, 2024Observed: 46.82 ft at 10:15PM Mar 18, 2024Observed: 46.82 ft at 10:30PM Mar 18, 2024Highest Forecast: 46.8 ft 2:00AM Mar 19, 2024Highest Forecast: 46.8 ft 8:00AM Mar 19, 2024Forecast: 46.7 ft 2:00PM Mar 19, 2024Forecast: 46.6 ft 8:00PM Mar 19, 2024Forecast: 46.5 ft 2:00AM Mar 20, 2024Forecast: 46.5 ft 8:00AM Mar 20, 2024Forecast: 46.4 ft 2:00PM Mar 20, 2024Forecast: 46.3 ft 8:00PM Mar 20, 2024Forecast: 46.3 ft 2:00AM Mar 21, 2024Forecast: 46.2 ft 8:00AM Mar 21, 2024USGS--Water Resources of the United StatesLOWM3(plotting HGIRG) Graph Created (11:30PM Mar 18, 2024)ObservedForecast (issued 11:42AM Mar 18)Latest observed value: 46.82 ft at 10:30 PM EDT 18-Mar-2024. Flood Stage is 52 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: NAVD88
Metadata
NOTE: Forecasts for the Merrimack River at Lowell are issued routinely year-round.

Vertical datum height surveyed by the USGS

Return to Area Map
Upstream Gauge - at Nashua Upstream Gauge
Flood Categories (in feet)
Major Flood Stage: 58
Moderate Flood Stage: 54
Flood Stage: 52
Action Stage: 50
Low Stage (in feet): -9999

Historic Crests
(1) 68.40 ft on 03/20/1936
(2) 60.60 ft on 04/23/1852
(3) 60.57 ft on 09/23/1938
(4) 58.84 ft on 05/15/2006
(5) 58.09 ft on 04/17/2007
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 53.16 ft on 12/20/2023 (P)
(2) 54.64 ft on 04/01/2010
(3) 53.63 ft on 03/16/2010
(4) 58.09 ft on 04/17/2007
(5) 58.84 ft on 05/15/2006
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to www.floodsmart.gov.

Zoom Level:16
KML Image
Gauge LocationGauge Map Marker
Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
65 This is a serious flood event. All persons along the Merrimack River should follow the evacuation recommendations from your local emergency managemant officials. If asked to evacuate, do so immediately. All flood protection measures must be rushed to completion in flood prone areas.
62 This is a serious flood event. All persons along the Merrimack River should follow the evacuation recommendations from your local emergency managemant officials. If asked to evacuate, do so immediately. All flood protection measures must be rushed to completion in flood prone areas.
60 This is a serious flood event. All persons along the Merrimack River from the Massachusetts border through Methuen should follow the evacuation recommendations from your local emergency managemant officials. If asked to evacuate, do so immediately. All flood protection measures must be rushed to completion in flood prone areas.
58 Flooding is expected to overspread portions of Route 113 above Pawtucket Falls. Also, portions of Route 110 and several homes and businesses along Route 110 heading north and east into Tewksbury may begin to experience flooding. Follow the direction of your local emergency management officals. If asked to evacuate, do so immediately.
56 Flooding will become more widespread from the New Hampshire border through Methuen. Those areas outside local flood protection should take measures to protect property. Follow the directions of your local emergency management agency.
55 Flooding will become more widespread from the New Hampshire border through Methuen. Those areas outside local flood protection should take measures to protect property. Follow the directions of your local emergency management agency.
52 Lowland flooding is likely along the Merrimack River. Most of the impact will be felt by businesses and mills where basement flooding is likely.
About This Location Collapse

Latitude: 42.645925° N, Longitude: 71.298394° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 52 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
Elevation
(gauge height = flood stage)
Elevation information source
NAVD88 4.37 56.37 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other NULL NULL  

Current/Historical Observations:

Additional Information Collapse
Potential River Levels - Used to
Potential River Levels
Used to Estimate the Chance of Flooding and the Range of Possible River Levels
10 Day (HEFS) 7 Day (NAEFS) 7 Day (GEFS)
HEFS Ensemble NAEFS Ensemble GEFS Ensemble

Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.

Click individual graphics to enlarge.

Resources Collapse
Hydrologic Resources Additional Resources
Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
Boston / Norton Weather Forecast Office
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Norton, MA 02766
(508) 622-3250
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Page last modified: 2-Nov-2020 7:30 PM
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