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Severe storms are firing up across the Northeast and mid-Atlantic states on Sunday, packing threats of damaging wind gusts and large hail from New York City through Washington, while flash flooding is also swamping parts of Connecticut.
Russia's Shiveluch volcano continues to shoot ash into the sky after beginning its explosive eruption over the weekend following a powerful magnitude 7.0 earthquake in the Pacific Ocean.
WW 634 SEVERE TSTM DC DE MD NJ NY PA VA WV CW 181800Z – 190200Z 
CWZ000-190200- URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 634 NWS Storm Prediction Center Norman OK 200 PM EDT Sun Aug 18 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of District Of Columbia Delaware Central and Eastern Maryland New Jersey Southeast New York Eastern Pennsylvania Northern Virginia Eastern Panhandle of West Virginia Coastal Waters * Effective this Sunday afternoon and evening from 200 PM until 1000 PM EDT. * Primary threats include... Scattered damaging wind gusts to 70 mph likely Isolated large hail events to 1.5 inches in diameter possible SUMMARY...Scattered thunderstorms will increase in coverage through the afternoon across the watch area. The more intense storms will pose a risk of locally damaging wind gusts and hail. The severe thunderstorm watch area is approximately along and 85 statute miles east and west of a line from 55 miles east of Charlottesville VA to 40 miles east northeast of Wilkesbarre PA. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU4). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 24025. ...Hart
Spectators attending the Pikes Peak Air Show in Colorado Springs, Colorado, this weekend are being urged to take proper safety precautions after about 100 people were affected by heat-related illnesses, including 10 who needed to be treated at local hospitals, according to officials.
Tropical Storm Ernesto is slowly moving away from Bermuda. A few gusty showers will still rotate over the island, but the worst of it is over.
Slight drop in temps and a small rain chance by late this week
WW 633 SEVERE TSTM NE SD 180935Z – 181500Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 633 NWS Storm Prediction Center Norman OK 435 AM CDT Sun Aug 18 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Central and Northeast Nebraska Southern South Dakota * Effective this Sunday morning from 435 AM until 1000 AM CDT. * Primary threats include... Isolated significant damaging wind gusts to 75 mph possible Isolated very large hail events to 2.5 inches in diameter possible SUMMARY...Scattered elevated supercells are forecast to continue southeast into the Watch area this morning. Large to very large hail (1 to 2.5 inches in diameter) and severe gusts (60-75 mph) are possible with the stronger storms as this activity moves southeast along an instability gradient in advance of a mid-level disturbance. The severe thunderstorm watch area is approximately along and 55 statute miles east and west of a line from 80 miles north northeast of Ainsworth NE to 35 miles south southeast of Burwell NE. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU3). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && AVIATION...A few severe thunderstorms with hail surface and aloft to 2.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A few cumulonimbi with maximum tops to 550. Mean storm motion vector 32030. ...Smith