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ALT Area Hydrologic Discussion
ALT A moderate risk of excessive rainfall is in effect for portions of southern Utah into southwestern Colorado. A broader slight risk is in effect across the Four Corners states and into southern Nevada.
ALT This graphic displays Severe Thunderstorm watch number 689 plotted on a map. The watch is in effect until 9:00 PM MST. The watch includes parts of Arizona. The threats associated with this watch are a couple tornadoes possible, scattered hail up to two inch size possible and scattered gusts up to 70 mph possible. There are 5,003,542 people in the watch along with 1416 schools and 63 hospitals.
ALT A Moderate Risk ERO is in effect tomorrow across portions of Southwestern Colorado. Rainfall totals of 2-3 inches, local 5 inches, atop snow melt on higher terrain will allow for locally significant flash and riverine flooding. The Four Corners may see scattered flash flooding.
ALT Graphic promoting a NEDTalk about El Niño with the NOAA logo in the bottom right-hand corner.
ALT National Weather Service graphic warning of scattered severe thunderstorms across Arizona Wednesday Oct 21, highlighting large 2+ inch hail, isolated tornadoes, and damaging winds with highest risk near Phoenix, Flagstaff and Lake Havasu City; monitor forecasts.
ALT Map and infographic detailing strong wind, high surf, and coastal flood impacts late this week for Southwest Alaska. Watches In Effect (Fri AM – Sat AM): Kuskokwim Delta & N. Bristol Bay: High Wind Watch (S/SE 35–50 mph, gusts to 70 mph; 60–80% chance of >60 mph winds). Aleutians East Borough (Cold Bay, King Cove): High Wind Watch (SE 40–50 mph, gusts to 75 mph; 40–60% chance of ≥75 mph winds). Kuskokwim Delta Coast (incl. Kipnuk & Kwigillingok): Coastal Flood/High Surf Watch (Fri AM – Fri night). Water levels 2–3 ft above average tide line; low-lying coastal flooding and erosion possible. Actions: Secure loose outdoor objects, prepare belongings, evaluate travel plans, and monitor updates.
ALT A moderate storm is expected to impact Southern California Wednesday through Thursday. Rainfall totals are expected to generally range from 0.5 to 1.5 inches except 1.5 to 3 inches across south facing mountains/foothills. Minor flooding and debris flows are possible especially near recent burn scars. Peak timing for most locations will fall into the late Wednesday morning through late Thursday morning timeframe. Isolated to scattered thunderstorms are possible bringing potential hazards such as cloud-to-ground lightning, heavy downpours, gusty winds, small hail, and even isolated waterspouts.
ALT A Slight Risk (yellow, at least 15% chance) covers much of Arizona, including Phoenix, extending into southern Utah and western New Mexico. A separate Slight Risk area affects portions of coastal Southern California. A broader Marginal Risk (green, at least 5% chance) extends across portions of California, Nevada, Arizona, Utah, and New Mexico.
ALT The Slight Risk shifts eastward, covering portions of eastern Nevada, southern Utah, much of Arizona, and western New Mexico, including Phoenix. A broader Marginal Risk encompasses surrounding areas of Nevada, Utah, Arizona, and New Mexico, with a separate area near coastal Southern California.
