Portsmouth, NH Warnings, Watches and Advisories

Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Portsmouth.

Use the Radar Maps link provided to understand the trajectory of a storm.

Flood Warning issued March 17 at 6:59AM EDT until March 18 at 8:00AM EDT by NWS Gray ME

...The National Weather Service in Gray ME has issued a Flood Warning for the following rivers in New Hampshire... Suncook River At North Chichester affecting Merrimack and Belknap Counties. * WHAT...Minor flooding is forecast. * WHERE...Suncook River at North Chichester. * WHEN...From this afternoon to tomorrow morning. * IMPACTS...At 7.0 feet, Water up to Bachelder Road in Allenstown. Waterfront campsites impacted. * ADDITIONAL DETAILS... - At 6:15 AM EDT Tuesday the stage was 6.5 feet. - Forecast...The river is expected to rise above flood stage this afternoon to a crest of 7.1 feet this evening. It will then fall below flood stage just after midnight tonight. - Flood stage is 7.0 feet.

Flood Warning issued March 17 at 6:03AM EDT until March 18 at 12:18AM EDT by NWS Gray ME

...The National Weather Service in Gray ME has issued a Flood Warning for the following rivers in New Hampshire...Maine... Saco River At Conway affecting Carroll, Cumberland and Oxford Counties. * WHAT...Minor flooding is forecast. * WHERE...Saco River at Conway. * WHEN...From this morning to just after midnight tonight. * IMPACTS...At 9.0 feet, Expect flooding of low-bottom fields and private roads in Conway and North Conway. Minor flooding in Transvale Acres, Moat Brook Bridge, and the lower part of E. Road flood. * ADDITIONAL DETAILS... - At 4:45 AM EDT Tuesday the stage was 7.0 feet. - Forecast...The river is expected to rise above flood stage late this morning to a crest of 9.5 feet this afternoon. It will then fall below flood stage this evening. - Flood stage is 9.0 feet.

Flood Warning issued March 17 at 4:52AM EDT until March 17 at 5:03PM EDT by NWS Gray ME

...The Flood Warning is extended for the following rivers in New Hampshire... Pemigewasset River At Woodstock affecting Grafton County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Pemigewasset River at Woodstock. * WHEN...From early this morning to late this afternoon. * IMPACTS...At 9.0 feet, Minor lowland flooding begins. * ADDITIONAL DETAILS... - At 4:30 AM EDT Tuesday the stage was 9.3 feet. - Forecast...The river is expected to fall below flood stage late this morning and continue falling to 3.7 feet early Friday morning. - Flood stage is 9.0 feet.