Hempstead, NY 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 Hempstead.

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

Air Quality Alert issued May 18 at 9:44AM EDT by NWS Upton NY

The New York State Department of Environmental Conservation's Air Quality Health Advisory for the following counties: New York, Bronx, Kings, Queens, Richmond, Westchester, and Rockland, now includes two additional counties: Orange and Putnam, This Air Quality Health Advisory is in effect until 11 PM EDT this evening. Air quality levels in outdoor air are predicted to be greater than an Air Quality Index value of 100 for the pollutant of Ground Level Ozone. The Air Quality Index, or AQI, was created as an easy way to correlate levels of different pollutants to one scale. The higher the AQI value, the greater the health concern. When pollution levels are elevated, the New York State Department of Health recommends that individuals consider limiting strenuous outdoor physical activity to reduce the risk of adverse health effects. People who may be especially sensitive to the effects of elevated levels of pollutants include the very young, and those with preexisting respiratory problems such as asthma or heart disease. Those with symptoms should consider consulting their personal physician. For additional information, please visit the New York State Department of Environmental Conservation website at, https://on.ny.gov/nyaqi, or call the Air Quality Hotline at 1 800 5 3 5, 1 3 4 5.

Air Quality Alert issued May 18 at 9:40AM EDT by NWS Upton NY

The New York State Department of Environmental Conservation's Air Quality Health Advisory for the following counties: New York, Bronx, Kings, Queens, Richmond, Nassau, Suffolk, Westchester, and Rockland, now includes two additional counties: Orange and Putnam, This Air Quality Health Advisory is in effect until 11 PM EDT this evening. Air quality levels in outdoor air are predicted to be greater than an Air Quality Index value of 100 for the pollutant of Ground Level Ozone. The Air Quality Index, or AQI, was created as an easy way to correlate levels of different pollutants to one scale. The higher the AQI value, the greater the health concern. When pollution levels are elevated, the New York State Department of Health recommends that individuals consider limiting strenuous outdoor physical activity to reduce the risk of adverse health effects. People who may be especially sensitive to the effects of elevated levels of pollutants include the very young, and those with preexisting respiratory problems such as asthma or heart disease. Those with symptoms should consider consulting their personal physician. For additional information, please visit the New York State Department of Environmental Conservation website at, https://on.ny.gov/nyaqi, or call the Air Quality Hotline at 1 800 5 3 5, 1 3 4 5.

Air Quality Alert issued May 18 at 9:37AM EDT by NWS Binghamton NY

The New York State Department of Environmental Conservation at Albany has issued a Air Quality Health Advisory for Ground Level Ozone from 11am this morning until 11 PM EDT this evening. Air quality levels in outdoor air are predicted to be greater than an air quality index value of 100 for Ground Level Ozone. The air quality index...or AQI...was created as an easy way to correlate levels of different pollutants to one scale. The higher the AQI value, the greater the health concern. When pollution levels are elevated...the New York State Department of Health recommends that individuals consider limiting strenuous outdoor physical activity to reduce the risk of adverse health effects. People who may be especially sensitive to the effects of elevated levels of pollutants include the very young and those with pre existing respiratory problems such as asthma or heart disease. Those with symptoms should consider consulting their personal physician. For additional information, please visit the New York State Department of Environmental Conservation website at, https://on.ny.gov/nyaqi, or call the Air Quality Hotline at 800-535-1345.

Air Quality Alert issued May 18 at 9:32AM EDT by NWS Albany NY

The New York State Department of Environmental Conservation at Albany has issued a Air Quality Health Advisory for Ground Level Ozone from 11 AM this morning until 11 PM EDT this evening. Air quality levels in outdoor air are predicted to be greater than an air quality index value of 100 for Ground Level Ozone. The air quality index...or AQI...was created as an easy way to correlate levels of different pollutants to one scale. The higher the AQI value, the greater the health concern. When pollution levels are elevated...the New York State Department of Health recommends that individuals consider limiting strenuous outdoor physical activity to reduce the risk of adverse health effects. People who may be especially sensitive to the effects of elevated levels of pollutants include the very young and those with pre existing respiratory problems such as asthma or heart disease. Those with symptoms should consider consulting their personal physician. For additional information, please visit the New York State Department of Environmental Conservation website at, https://on.ny.gov/nyaqi, or call the Air Quality Hotline at 800-535- 1345.

Air Quality Alert issued May 18 at 8:48AM EDT by NWS Upton NY

The New York State Department of Environmental Conservation's Air Quality Health Advisory for the following counties: New York, Bronx, Kings, Queens, Richmond, Westchester, and Rockland, remains in effect until 11 PM EDT this evening. Air quality levels in outdoor air are predicted to be greater than an Air Quality Index value of 100 for the pollutant of Ground Level Ozone. The Air Quality Index, or AQI, was created as an easy way to correlate levels of different pollutants to one scale. The higher the AQI value, the greater the health concern. When pollution levels are elevated, the New York State Department of Health recommends that individuals consider limiting strenuous outdoor physical activity to reduce the risk of adverse health effects. People who may be especially sensitive to the effects of elevated levels of pollutants include the very young, and those with preexisting respiratory problems such as asthma or heart disease. Those with symptoms should consider consulting their personal physician. For additional information, please visit the New York State Department of Environmental Conservation website at, https://on.ny.gov/nyaqi, or call the Air Quality Hotline at 1 800 5 3 5, 1 3 4 5.

Special Weather Statement issued May 18 at 4:32AM EDT by NWS Burlington VT

...Please check with state and local authorities regarding guidelines for allowed activities... * The warm air temperatures in the lower 80s today may cause people to underestimate the dangers of the cold water temperatures which are currently only in the lower 30s across Lake Champlain, and in the lower 30s in the regions smaller lakes and rivers. * The cold water temperatures can quickly cause hypothermia to anyone immersed in the water. According to the US Coast Guard, when the water temperatures are below 50 degrees, the chance of immediate incapacitation due to cold shock is extremely high. Anyone on small boats, canoes or kayaks should plan accordingly if recreating this weekend and use extreme caution to avoid this threat. Paddle smart from the start and always wear your life jacket! * Strong winds are also expected today with gusts up to 25 mph from the south. If boating on large bodies of water, these strong winds can increase the likelihood of overturning your boat, canoe or kayak due to increased wave heights.

Air Quality Alert issued May 17 at 11:48PM EDT by NWS Upton NY

The New York State Department of Environmental Conservation's Air Quality Health Advisory for the following counties: New York, Bronx, Kings, Queens, Richmond, Westchester and Rockland, remains in effect until 11 PM EDT this evening. Another air quality health advisory has been issued for these same areas on Monday between 11 AM and 11 PM EDT. Air quality levels in outdoor air are predicted to be greater than an Air Quality Index value of 100 for the pollutant of Ground Level Ozone. The Air Quality Index, or AQI, was created as an easy way to correlate levels of different pollutants to one scale. The higher the AQI value, the greater the health concern. When pollution levels are elevated, the New York State Department of Health recommends that individuals consider limiting strenuous outdoor physical activity to reduce the risk of adverse health effects. People who may be especially sensitive to the effects of elevated levels of pollutants include the very young, and those with preexisting respiratory problems such as asthma or heart disease. Those with symptoms should consider consulting their personal physician. For additional information, please visit the New York State Department of Environmental Conservation website at, https://on.ny.gov/nyaqi, or call the Air Quality Hotline at 1 800 5 3 5, 1 3 4 5.