Watches, Warnings, and Advisories

Current Watches, Warnings and Advisories for Merrimack (NHC013) New Hampshire Issued by the National Weather Service

 

Flash Flood Watch - Merrimack (New Hampshire)


Updated:Mon, 03-Aug-2020 1:57pm EDT
Effective:Tue, 04-Aug-2020 2:00pm EDT
Expires:Wed, 05-Aug-2020 6:00am EDT
Severity:Severe
Urgency:Expected
Certainty:Possible
Status:Actual
Type:Alert
Category:Met

Areas affected: Belknap; Cheshire; Merrimack; Northern Carroll; Northern Coos; Northern Grafton; Southern Carroll; Southern Coos; Southern Grafton; Sullivan; Western And Central Hillsborough
 
Instructions: A flash flood watch means that conditions may developed that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should flash flood warnings be issues.

Message summary: ...flash flood watch in effect from tuesday afternoon through late tuesday night...
The national weather service in gray has issued a
* flash flood watch for portions of maine and new hampshire, including the following areas, in maine, central somerset, northern franklin, northern oxford, southern franklin and southern oxford. In new hampshire, belknap, cheshire, merrimack, northern carroll, northern coos, northern grafton, southern carroll, southern coos, southern grafton, sullivan and western and central hillsborough.
* from tuesday afternoon through late tuesday night
* heavy rainfall of 2 to 4 inches is expected from tuesday afternoon through tuesday night. The expected heavy rainfall rates have the potential to cause localized flash flooding, especially across complex terrain and poor drainage urban areas.
* localized sharp rises on streams and rivers are expected.
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Hurricane Local Statement - Merrimack (New Hampshire)


Updated:Mon, 03-Aug-2020 11:43am EDT
Effective:Tue, 04-Aug-2020 2:00pm EDT
Expires:Mon, 03-Aug-2020 7:45pm EDT
Severity:Severe
Urgency:Expected
Certainty:Possible
Status:Actual
Type:Alert
Category:Met

Areas affected: Belknap; Cheshire; Coastal Rockingham; Eastern Hillsborough; Interior Rockingham; Merrimack; Northern Carroll; Northern Coos; Northern Grafton; Southern Carroll; Southern Coos; Southern Grafton; Strafford; Sullivan; Western And Central Hillsborough
 
Message summary: This product covers new hampshire and western maine
***tropical storm isaias expected to affect new hampshire and western maine*** new information ---------------
* changes to watches and warnings: - a tropical storm watch has been issued for cheshire, eastern hillsborough, and western and central hillsborough
* current watches and warnings: - a tropical storm watch is in effect for androscoggin, belknap, central interior cumberland, central somerset, cheshire, coastal cumberland, coastal rockingham, coastal waldo, coastal york, eastern hillsborough, interior cumberland highlands, interior rockingham, interior waldo, interior york, kennebec, knox, lincoln, merrimack, northern carroll, northern coos, northern franklin, northern grafton, northern oxford, sagadahoc, southern carroll, southern coos, southern franklin, southern grafton, southern oxford, southern somerset, strafford, sullivan, and western and central hillsborough
* storm information: - about 1040 miles southwest of portland me or about 990 miles southwest of portsmouth nh - 30.7n 80.1w - storm intensity 70 mph - movement north or 360 degrees at 13 mph situation overview ------------------ tropical storm isaias is expected to move through new england late tuesday and tuesday night. Heavy rainfall will be the primary threat but tropical storm force gusts are also possible. Areal and river flooding along with downed limbs and power outages will be possible. Potential impacts -----------------
* wind: prepare for dangerous wind having possible significant impacts across western maine and new hampshire. Potential impacts in this area include: - some damage to roofing and siding materials, along with damage to porches, awnings, carports, and sheds. A few buildings experiencing window, door, and garage door failures. Mobile homes are damaged, especially if unanchored. Unsecured lightweight objects become dangerous projectiles. - numerous large trees snapped or uprooted, leading to downed power lines. - many roads are impassable from debris, caused by downed trees and power lines. Many bridges, causeways, and access routes impassable. - numerous power and communications outages likely.
* surge: prepare for locally hazardous surge having possible limited impacts across coastal maine and new hampshire. Potential impacts in this area include: - splash-over near the time of high tide tuesday night. - minor to moderate beach erosion. Heavy surf also breaching dunes, mainly in usually vulnerable locations. Strong rip currents. - minor coastal flooding due to inundation possible.
* flooding rain: prepare for dangerous rainfall flooding having possible significant impacts across western maine and new hampshire. Potential impacts include: - moderate rainfall flooding may prompt several evacuations and rescues. - rivers and tributaries may quickly become swollen with swifter currents and overspill their banks in a few places, especially in usually vulnerable spots. Small streams, creeks, canals, and ditches will overflow. - flood waters can enter some structures or weaken foundations. Several places may experience expanded areas of rapid inundation at underpasses, low-lying spots, and poor drainage areas. Some streets and parking lots take on moving water as storm drains and retention ponds overflow. Driving conditions will become hazardous. Some road and bridge closures.
* tornadoes: an isolated tornado is possible across new hampshire and western maine.
* other coastal hazards: strong rip currents are possible. Precautionary/preparedness actions ----------------------------------
* evacuations: watch/warning phase - listen to local officials for recommended preparedness actions, including possible evacuation.
* other preparedness information: now is the time to check your emergency plan and take necessary actions to secure your home or business. Deliberate efforts should be underway to protect life and property. Ensure that your emergency supplies kit is stocked and ready. When making safety and preparedness decisions, do not focus on the exact forecast track as there are inherent forecast uncertainties which must be taken into account. If you live in a place that is particularly vulnerable to high wind, such as a mobile home, an upper floor of a high rise building, or on a boat, plan to move to safe shelter. Take enough supplies for you and your family for several days. If you live in a place particularly vulnerable to flooding, such as near the ocean or a large inland lake, in a low lying or poor drainage area, in a valley or canyon, or near an already swollen river, plan to move to safe shelter on higher ground always heed the advice of local officials and comply with any orders that are issued. Do not needlessly jeopardize your life or the lives of others. When securing your property, outside preparations should be conducted as soon as possible before conditions deteriorate. The onset of strong gusty winds and heavy rain can cause certain preparedness activities to become unsafe. Be sure to let friends and other family members know of your intentions and whereabouts for surviving the storm. For emergency purposes, have someone located away from the threatened area serve as your point of contact. Share vital contact information with others. Keep cell phones handy and well charged. Be a good samaritan and check on those who may not be fully aware of the situation or who are unable to make personal preparations. Visitors to the area should become familiar with nearby surroundings. If you are a visitor, know the name of the county or parish in which you are located and where it is relative to current watches and warnings. If staying at a hotel, ask the management staff about their onsite disaster plan. Listen for evacuation orders, especially pertaining to area visitors. Closely monitor noaa weather radio or other local news outlets for official storm information. Listen for possible changes to the forecast.
* additional sources of information: - for information on appropriate preparations see ready.gov - for information on creating an emergency plan see getagameplan.org - for additional disaster preparedness information see redcross.org next update ----------- the next local statement will be issued by the national weather service in gray me around 6 pm, or sooner if conditions warrant.
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Tropical Storm Watch - Merrimack (New Hampshire)


Updated:Mon, 03-Aug-2020 11:25am EDT
Effective:Mon, 03-Aug-2020 11:25am EDT
Expires:Mon, 03-Aug-2020 7:30pm EDT
Severity:Severe
Urgency:Future
Certainty:Possible
Status:Actual
Type:Alert
Category:Met

Areas affected: Merrimack
 
Message summary: ...tropical storm watch remains in effect...
* locations affected - loudon
* wind - latest local forecast: below tropical storm force wind - peak wind forecast: 25-35 mph with gusts to 50 mph - threat to life and property that includes typical forecast uncertainty in track, size and intensity: potential for wind 58 to 73 mph - plan: plan for dangerous wind of equivalent strong tropical storm force. - prepare: efforts to protect life and property should now be underway. Prepare for significant wind damage. - act: act now to complete preparations before the wind becomes hazardous. - potential impacts: significant - some damage to roofing and siding materials, along with damage to porches, awnings, carports, and sheds. A few buildings experiencing window, door, and garage door failures. Mobile homes are damaged, especially if unanchored. Unsecured lightweight objects become dangerous projectiles. - numerous large trees snapped or uprooted, leading to downed power lines. - many roads are impassable from debris, caused by downed trees and power lines. Many bridges, causeways, and access routes impassable. - numerous power and communications outages likely.
* flooding rain - latest local forecast: - peak rainfall amounts: additional 1-3 inches, with locally higher amounts - threat to life and property that includes typical forecast uncertainty in track, size and intensity: potential for moderate flooding rain - plan: emergency plans should include the potential for moderate flooding from heavy rain. Evacuations and rescues are possible. - prepare: consider protective actions if you are in an area vulnerable to flooding. - act: heed any flood watches and warnings. Failure to take action may result in serious injury or loss of life. - potential impacts: significant - moderate rainfall flooding may prompt several evacuations and rescues. - rivers and tributaries may quickly become swollen with swifter currents and overspill their banks in a few places, especially in usually vulnerable spots. Small streams, creeks, canals, and ditches will overflow. - flood waters can enter some structures or weaken foundations. Several places may experience expanded areas of rapid inundation at underpasses, low-lying spots, and poor drainage areas. Some streets and parking lots take on moving water as storm drains and retention ponds overflow. Driving conditions will become hazardous. Some road and bridge closures.
* tornado - latest local forecast: - situation is unfavorable for tornadoes - threat to life and property that includes typical forecast uncertainty in track, size and intensity: tornadoes not expected - plan: tornadoes are not expected. Showers and thunderstorms with gusty winds may still occur. - prepare: little to no preparations needed to protect against tornadoes at this time. Keep informed of the latest tornado situation. - act: listen for changes in the forecast. - potential impacts: little to none - little to no potential impacts from tornadoes.
* for more information: - http://ready.gov/hurricanes
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Source: NWS Watches, Warnings or Advisories for zone NHC013

national advisories