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A severe thunderstorm warning indicates the warned area is in impending danger from hail or wind speeds meeting warning criteria as well as from lightning and hydrological impacts associated with the storm cell. Severe thunderstorms can and do produce tornadoes without warning. [2] While not all severe thunderstorms produce tornadoes, they can ...
Severe thunderstorm warning (SVR) – A severe thunderstorm is indicated by Doppler weather radar or sighted by Skywarn spotters or other persons, such as local law enforcement. A severe thunderstorm contains large damaging hail of 1 inch (2.5 cm) in diameter or larger, and/or damaging winds of 58 mph (93 km/h) or greater.
The Storm Prediction Center issues convective outlooks (AC), consisting of categorical and probabilistic forecasts describing the general threat of severe convective storms over the contiguous United States for the next six to 192 hours (Day 1 through Day 8). These outlooks are labeled and issued by day, and are issued up to five times per day.
A high risk severe weather event is the greatest threat level issued by the Storm Prediction Center (SPC) for convective weather events in the United States. On the scale from one to five, a high risk is a level five; thus, high risks are issued only when forecasters at the SPC are confident of a major severe weather outbreak.
Stroke symptoms may seem to come on suddenly, but there may be warning signs in some situations. A severe headache, or any unusual type of headache, is one potential warning sign of a stroke ...
The injection isn’t a cure. It won’t stop a severe allergic reaction. Even if your child seems OK, emergency medical care is a must. Always call 911 or get to the nearest emergency room as ...
Insomnia or excessive sleeping. Irritability. Loss of interest in activities that used to be enjoyable. Hopelessness. Persistent thoughts of something bad happening. Thoughts of death or suicide ...
Severe asthma either does not respond to treatments and medications at all or is very difficult to treat. This lack of response to medications is known as therapy-resistant, or treatment-resistant ...