At 902 AM MDT, a severe thunderstorm was located 11 miles northwest of Canyonlands National Park, or 27 miles west of Moab, moving northeast at 35 mph. HAZARD...60 mph wind gusts and half dollar size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. This severe thunderstorm will remain over mainly rural areas of northeastern Wayne and southeastern Emery Counties.
FFWSLC The National Weather Service in Salt Lake City has issued a * Flash Flood Warning for... Eastern Wayne County in southern Utah... * Until 1115 AM MDT. * At 817 AM MDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 0.5 and 0.75 inches of rain have fallen. The expected rainfall rate is 1.5 to 2.5 inches per hour. Additional rainfall amounts of 0.5 to 0.75 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Life threatening flash flooding. SOURCE...Radar. IMPACT...Life threatening flash flooding of slot canyons across eastern Wayne County. * Some slot that will experience flash flooding include... Angel Cove, Bloodhound, Benign, Garden Balcony, Bull Pasture, Larry, No Mans, Lost Spring, Robbers Roost, White Roost, Lower Sand, Hells Hole, Ho Hum, Pasture, Blue John and Little John Canyons.
At 827 AM MDT, Doppler radar was tracking a strong thunderstorm 18 miles east of Hanksville, moving northeast at 40 mph. HAZARD...Wind gusts up to 50 mph and half inch hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. This storm will remain over mainly rural areas of northern Garfield, eastern Wayne and southeastern Emery Counties. This includes Utah Route 95 between mile markers 4 and 18.
The National Weather Service issues alerts in different categories to indicate the severity of storms and if the public should take immediate action to prevent the loss of life or property or be aware of the potential of the same.
A weather warning is issued when severe weather conditions are occuring or imminent and there is danger to life and/or property. The warning will include what action should be taken including evacuation or shelter in place and should be heeded immediately. Warnings are usually issued for a small, specific area and for a definite period of time.
A weather watch is an alert issued by the National Weather Service when conditions are favorable for the development of severe weather. A weather watch means that severe weather is possible in the area, so it is important to stay tuned to the latest forecasts and be prepared for potential storms.
The purpose of a weather watch is to provide advance warning to people in the affected area so that they can take necessary precautions. It is important to remember that a weather watch does not mean that severe weather will definitely occur, but simply that there is a higher chance of it happening.
If you live in an area where severe weather is common, it may be wise to have a plan in place for what you will do if a storm hits. Make sure you have plenty of food and water stored, as well as flashlights, batteries, and other supplies. You may also want to consider evacuating if necessary.
An advisory means the conditions are likely to occur. These are typically used for less severe weather events like frost or winds but can be used for other types of severe weather.
A red flag warning is issued by the National Weather Service to inform the public, firefighters, and land management agencies that conditions are ideal for wildland fires and any fire which does start could spread rapidly. These are often issued after drought conditions, when humidity is very low and especially when there are high or erratic winds. The possibility of lightning is also a determining factor. Fire fighting agencies often will increase their staffing and equipment resources due to the forecast risk. For the public, a Red Flag Warning often means high fire danger leading to restrictions or bans on outdoor burning including burn piles, burn barrels and campfires. Use of anything which may produce sparks, including outdoor lawn equipment, chainsaws and welding, may be restricted or prohibited.
The weather criteria for fire weather watches and red flag warnings vary with each Weather Service office’s warning area based on the local vegetation type, topography, and distance from major water sources. They usually include the daily vegetation moisture content calculations, expected afternoon high temperature, afternoon minimum relative humidity and daytime wind speed.
An enhanced version of the warning, called extreme red flag warning, may be issued. This means that conditions for fire growth and behavior are extremely dangerous due to a combination of strong winds, very low humidity, long duration, and very dry fuels.