NOAA
SPC Severe Thunderstorm Watch 542
WW 542 SEVERE TSTM IL IN 160255Z – 160900Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 542 NWS Storm Prediction Center Norman OK 1055 PM EDT Mon Jul 15 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of East central Illinois West central into central Indiana * Effective this Monday night and Tuesday morning from 1055 PM until 500 AM EDT. * Primary threats include... Scattered damaging winds and isolated significant gusts to 75 mph likely Isolated large hail events to 1 inch in diameter possible A tornado or two possible SUMMARY...A well-formed, bowing squall line with a history of damaging winds will continue east-southeastward from Illinois into Indiana through the early morning hours. Wind damage and severe wind gusts of 60-75 mph will be the main threat, though isolated large hail near 1 inch in diameter and a tornado or two with embedded circulations will also be possible. The severe thunderstorm watch area is approximately along and 45 statute miles north and south of a line from 40 miles south southwest of Decatur IL to 40 miles northeast of Indianapolis IN. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU2). 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. && OTHER WATCH INFORMATION...CONTINUE...WW 539...WW 541... AVIATION...A few severe thunderstorms with hail surface and aloft to 1 inch. Extreme turbulence and surface wind gusts to 65 knots. A few cumulonimbi with maximum tops to 550. Mean storm motion vector 30040. ...Thompson
SPC Tornado Watch 541
WW 541 TORNADO IA IL IN MI WI LM 152350Z – 160600Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 541 NWS Storm Prediction Center Norman OK 650 PM CDT Mon Jul 15 2024 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Extreme east central Iowa Northern Illinois Northwest Indiana Southwest Lower Michigan Extreme southern Wisconsin Lake Michigan * Effective this Monday night and Tuesday morning from 650 PM until 100 AM CDT. * Primary threats include... A few tornadoes likely Widespread damaging winds and scattered significant gusts to 90 mph likely Scattered large hail events to 1.5 inches in diameter possible SUMMARY...Thunderstorms are expected to evolve into one or more bow echoes from Iowa into northern Illinois this evening, with the potential to produce swaths of significant severe gusts up to 75-90 mph and several tornadoes with embedded circulations. The storms will spread into northwest Indiana and southwest Lower Michigan later tonight. The tornado watch area is approximately along and 100 statute miles east and west of a line from 65 miles northwest of Benton Harbor MI to 55 miles south southeast of Marseilles IL. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU1). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Tornado Watch means conditions are favorable for tornadoes and 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. && OTHER WATCH INFORMATION...CONTINUE...WW 539...WW 540... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 80 knots. A few cumulonimbi with maximum tops to 600. Mean storm motion vector 29040. ...Thompson
SPC Severe Thunderstorm Watch 540
WW 540 SEVERE TSTM NY 152300Z – 160400Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 540 NWS Storm Prediction Center Norman OK 700 PM EDT Mon Jul 15 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Eastern New York * Effective this Monday night from 700 PM until Midnight EDT. * Primary threats include... Scattered damaging wind gusts to 70 mph possible SUMMARY...An organized line of storms will continue eastward through early tonight into eastern New York, with a continued threat for damaging gusts. The severe thunderstorm watch area is approximately along and 50 statute miles east and west of a line from 60 miles northwest of Glens Falls NY to 80 miles south southwest of Albany NY. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU0). 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. && OTHER WATCH INFORMATION...CONTINUE...WW 538...WW 539... AVIATION...A few severe thunderstorms with hail surface and aloft to 0.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 26035. ...Thompson
SPC Severe Thunderstorm Watch 539
WW 539 SEVERE TSTM IA IL MO WI 152020Z – 160400Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 539 NWS Storm Prediction Center Norman OK 320 PM CDT Mon Jul 15 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Central and Eastern Iowa Northwest Illinois Northeast Missouri Southwest Wisconsin * Effective this Monday afternoon and evening from 320 PM until 1100 PM CDT. * Primary threats include... Widespread damaging winds and isolated significant gusts to 85 mph likely Scattered large hail likely with isolated very large hail events to 2.5 inches in diameter possible A tornado or two possible SUMMARY...Intense thunderstorms will soon develop across Iowa in a very moist and unstable air mass. Activity will track eastward and organize into a fast-moving bowing cluster, capable of very damaging wind gusts and large hail. A tornado or two is also possible across this region. The severe thunderstorm watch area is approximately along and 85 statute miles north and south of a line from 25 miles west of Des Moines IA to 5 miles east southeast of Rockford IL. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU9). 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. && OTHER WATCH INFORMATION...CONTINUE...WW 538... AVIATION...A few severe thunderstorms with hail surface and aloft to 2.5 inches. Extreme turbulence and surface wind gusts to 75 knots. A few cumulonimbi with maximum tops to 600. Mean storm motion vector 27035. ...Hart
SPC Severe Thunderstorm Watch 538
WW 538 SEVERE TSTM NY PA LE LO 151620Z – 152300Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 538 NWS Storm Prediction Center Norman OK 1220 PM EDT Mon Jul 15 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Western and Central New York Northern Pennsylvania Lake Erie Lake Ontario * Effective this Monday afternoon and evening from 1220 PM until 700 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 are expected to intensify through the afternoon and spread eastward across the watch area. The strongest cells will pose a risk of damaging wind gusts and some hail. The severe thunderstorm watch area is approximately along and 70 statute miles north and south of a line from 30 miles west northwest of Jamestown NY to 30 miles south of Utica NY. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU8). 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 27030. ...Hart