SPC
SPC Severe Thunderstorm Watch 272
WW 272 SEVERE TSTM IA MN 202345Z – 210500Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 272 NWS Storm Prediction Center Norman OK 645 PM CDT Mon May 20 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Northwest and north central Iowa South central and southeast Minnesota * Effective this Monday night from 645 PM until Midnight CDT. * Primary threats include... Scattered damaging wind gusts to 60 mph possible Scattered large hail events to 1.5 inches in diameter possible SUMMARY...Scattered thunderstorm development is expected this evening along a slow moving front across southern Minnesota and northern Iowa. The storm environment will favor a mix of multicell clusters and storms with supercell structure capable of producing large hail of 1-1.5 inches in diameter and damaging outflow gusts up to 60 mph. The severe thunderstorm watch area is approximately along and 45 statute miles north and south of a line from 35 miles east of Rochester MN to 50 miles west of Storm Lake IA. 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 268...WW 269...WW 270...WW 271... AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 50 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 27020. ...Thompson
SPC Severe Thunderstorm Watch 271
WW 271 SEVERE TSTM IA NE 202330Z – 210500Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 271 NWS Storm Prediction Center Norman OK 630 PM CDT Mon May 20 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Extreme west central Iowa South central into east central and southeast Nebraska * Effective this Monday night from 630 PM until Midnight CDT. * Primary threats include... Scattered large hail likely with isolated very large hail events to 2 inches in diameter possible Scattered damaging wind gusts to 70 mph possible SUMMARY...Scattered thunderstorms are expected to form this evening, within an environment supporting supercells. Large hail of 1-2 inches in diameter and outflow gusts of 60-70 mph will be the main threats through early tonight. The severe thunderstorm watch area is approximately along and 55 statute miles north and south of a line from 10 miles west northwest of Kearney NE to 45 miles northeast of Lincoln NE. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU1). 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 268...WW 269...WW 270... AVIATION...A few severe thunderstorms with hail surface and aloft to 2 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 24020. ...Thompson
SPC Severe Thunderstorm Watch 270
WW 270 SEVERE TSTM NE WY 202215Z – 210500Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 270 NWS Storm Prediction Center Norman OK 415 PM MDT Mon May 20 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Southwest Nebraska Panhandle Southeast Wyoming * Effective this Monday afternoon and evening from 415 PM until 1100 PM MDT. * Primary threats include... Scattered large hail events to 1.5 inches in diameter possible Isolated damaging wind gusts to 70 mph possible SUMMARY...Scattered severe storms are expected to from and spread east-northeastward across southeast Wyoming and the southwest Nebraska Panhandle, with the primary threats of hail 1-1.5 inches in diameter and severe gusts of 60-70 mph. The severe thunderstorm watch area is approximately along and 70 statute miles east and west of a line from 15 miles west northwest of Scottsbluff NE to 45 miles west of Sidney NE. 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 268...WW 269... 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 450. Mean storm motion vector 25025. ...Thompson
SPC Tornado Watch 269
WW 269 TORNADO CO KS NE 202210Z – 210500Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 269 NWS Storm Prediction Center Norman OK 410 PM MDT Mon May 20 2024 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Northeast Colorado Extreme northwest Kansas Extreme southwest Nebraska * Effective this Monday afternoon and evening from 410 PM until 1100 PM MDT. * Primary threats include... A couple tornadoes possible Scattered large hail and isolated very large hail events to 2.5 inches in diameter likely Scattered damaging wind gusts to 70 mph possible SUMMARY...A few supercells are expected to form this evening across northeast CO, and the storms will then move east-northeastward toward extreme southwest Nebraska and northwest Kansas through late evening/early tonight. Very large hail to 2.5 inches in diameter and severe gusts of 60-70 mph will be the main threats, though a gradual increase in low-level moisture later this evening will support the potential for a couple of tornadoes. The tornado watch area is approximately along and 90 statute miles east and west of a line from 60 miles north northwest of Akron CO to 30 miles south southwest of Akron CO. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU9). 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 268... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 2.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean storm motion vector 26025. ...Thompson
SPC Severe Thunderstorm Watch 268
WW 268 SEVERE TSTM MI LM 202040Z – 210200Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 268 NWS Storm Prediction Center Norman OK 440 PM EDT Mon May 20 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Western and Central Lower Michigan Lake Michigan * Effective this Monday afternoon and evening from 440 PM until 1000 PM EDT. * Primary threats include... Isolated damaging wind gusts to 65 mph possible Isolated large hail events to 1.5 inches in diameter possible SUMMARY...Thunderstorms currently moving across Lake Michigan will spread into Lower Michigan soon. A few of the storms may pose a risk of locally damaging wind gusts and hail through early evening. The severe thunderstorm watch area is approximately along and 55 statute miles east and west of a line from 55 miles northeast of Muskegon MI to 15 miles southeast of Kalamazoo MI. 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. && OTHER WATCH INFORMATION...CONTINUE...WW 267... AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 55 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 25030. ...Hart