Thunderstorms and Heavy Rainfall in the Southeast, Montana, and Iowa; Lowell Begins to Impact Hawaii

Strong thunderstorms with damaging winds and heavy rain are expected across portions of the Southeast. Thunderstorms may produce large hail across portions of Montana. Heavy rainfall could produce flash flooding across Iowa and vulnerable areas in Utah. Lowell will bring heavy rain, dangerous swells and rip currents to portions of Hawaii. Sweltering heat persists across the South-Central US. Read More >

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Severe thunderstorms are defined by the National Weather Service as downdraft winds in excess of 58 miles an hour and/or hail 1 inch in diameter or greater. Severe thunderstorms are reported each year in all New Mexico counties, but they typically peak in the east during April through June and statewide July through August. The Storm Prediction Center in Norman, Oklahoma issues a SEVERE THUNDERSTORM WATCH to give you advance notice that severe thunderstorms are possible in your area. This gives you time to make preliminary plans for moving to a safe location if a severe thunderstorm warning is issued. The SPC also issues thunderstorm (convective) outlooks as seen below for days 1 through 3.



A SEVERE THUNDERSTORM WARNING is an urgent announcement that a severe thunderstorm has been reported or is imminent and warns you to take cover. Severe thunderstorm warnings are issued by local National Weather Service offices. *What you can do before* a storm strikes... Know the county you are located in and the names of the major nearby cities or towns, as watches and warnings will reference counties and inclusive communities. Check the latest weather forecast and hazardous weather outlook. Watch for signs of an approaching thunderstorm. If a storm is approaching, tune to NOAA Weather Radio and/or your favorite media outlet. Postpone outdoor activities if thunderstorms are imminent. This is your best way to avoid being caught in a dangerous situation. When thunderstorms approach...** Outdoors: REMEMBER if you can hear thunder, you are close enough to a storm to be struck by lightning. If possible, move to a sturdy building or hard top automobile. If safe shelter is not available, find a low spot away from trees, fences, and poles. Make yourself the smallest target possible and minimize your contact with the ground. Do not take shelter in small sheds, rock outcroppings, under isolated trees, or in convertible automobiles. If boating or swimming, get out of boats and away from the water, get to land and find shelter immediately. When boating, always stay tuned to the latest weather reports and return to safe harbor before the strong winds arrive. Indoors: Stay away from windows and go to the safest location on the lowest level of your home. Unplug unnecessary appliances and do not use a corded phone, but rather a cordless or wireless phone. Mobile homes are especially vulnerable to the high winds of a thunderstorm and are subject to overturning and rolling if not properly anchored to the ground. At a minimum, the frame should be secured with heavy steel straps. Heavy straps should also go over the top of the home with both frame and over the top ties secured in concrete footings.

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Thunderstorms and Heavy Rainfall in the Southeast, Montana, and Iowa; Lowell Begins to Impact Hawaii

Thunderstorm Preparedness