Author: ISC Meteorologists

The first wave of rain showers from last night will continue to work through the forecast area today. Then a stronger impulse will arrive early this afternoon over western Iowa. This activity will work off to the northeast into the widely scattered risk of severe weather where the main event will be today. The main threats will be hail, damaging wind gusts and heavy rainfall with a secondary threat of an isolated tornado over far NE Iowa. A scattered risk of heavy rainfall extends across north central Iowa where flooding is possible. All activity should exit later this evening. -…

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Severe thunderstorms will develop along a stationary front across northern Iowa 3-5 PM this afternoon with a hail/wind/tornado risk. The main tornado threat is focused across SE South Dakota and into northwest Iowa with any individual storms that can maintain surface-based characteristics. Then a stronger impulse of heavy rain will work into northwest Iowa after 11 PM tonight and into the pre-dawn hours of Saturday where the main concern will be flooding rains. The in-office model has another 1-2” of rain across northern Iowa with locally higher near the Minnesota border through Saturday morning. Another round of severe weather is…

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An area of rain showers centered over western Iowa will continue to dissipate as it slides east this morning. Then the focus turns to the severe thunderstorm/tornado threat later this afternoon through the evening with the main points below. 1. Instability will build into extreme western Iowa this afternoon behind the main line of showers. 2. Severe thunderstorms will develop along the warm frontal zone around 4-6 PM across western Iowa. 3. All hazards including hail, damaging winds and a couple isolated tornadoes are favorable. 4. The tornado threat focus extends from west central through southwest Iowa along the frontal…

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A couple storm systems will move out of the west this week bringing renewed severe weather risks. The first cold front will slide through the forecast area on Tuesday where isolated severe storms will initiate in the afternoon to evening across northern Iowa with a hail/wind/tornado threat. Then a second system will hit Wednesday evening with severe thunderstorms developing ahead of the frontal zone across southern Minnesota and northern Iowa. This activity will move south/southeast into Wednesday night with threats of hail and damaging winds. LONG RANGE: The pattern will become more supportive of renewed severe weather risks the week…

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A line of scattered showers will work through western Iowa this morning as a warm front lifts northward into the state. This activity should dissipate later in the morning as it slides east. Then severe thunderstorms will develop late this afternoon in an unstable environment across Nebraska and South Dakota. This complex will move east into western Iowa after 10 PM tonight with a hail/wind/heavy rainfall threat. A lower-end tornado threat extends over western Iowa given low-level shear. The line will progress east into central Iowa during the overnight where the risk will transition to primarily gusty winds. – Meteorologist…

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A frontal system will move out of the west today with initial severe weather developing tonight across Nebraska and northward into South Dakota. This activity will move east into western Iowa around midnight as a squall line with threats of damaging winds and hail. An isolated tornado is not off the table over west central to southwest Iowa. As the line progresses east, the main threat will shift to damaging wind gusts across central and eastern Iowa. Our thoughts and prayers go out to the town of Greenfield and everyone else impacted by the strong tornadoes across southwest and central…

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MAJOR SEVERE WEATHER EVENT TODAY – Tuesday, May 21, 2024 – A complex of thunderstorms over north/central Iowa will continue to shove east this morning before exiting around midday. The stronger impulse will hit western Iowa early this afternoon where the details remain the same from yesterday’s update, so I will summarize the main points. Southwest to central Iowa should be on high alert for strong tornadoes and damaging winds. The focus is on the southern extent of the afternoon impulse for robust severe thunderstorm development across southwest Iowa 2-4 PM this afternoon. This will arrive in central Iowa 4-6…

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MAJOR SEVERE WEATHER EVENT – Tuesday, May 21, 2024 – Hey all, Raiden Storm here collaborating with Meteorologist Maurer, here is our latest on the very strong severe weather event to hit tomorrow. Discussion: Overnight convection from Monday night will continue to shove across the northern half of the state once Tuesday morning hits. This activity should exit later in the morning ahead of an active day across Iowa. Then a stronger impulse of showers and thunderstorms will work out of Nebraska and into western Iowa around early afternoon. The focus will be on the southern extent of this line…

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The next frontal system will arrive today with scattered showers and thunderstorms developing over northwest Iowa early this afternoon. Then the main pulse of moisture will hit all western Iowa around 3-4 PM extending through late afternoon. A couple stronger storms are possible over northwest Iowa this evening with the primary risk of hail. This activity will reach central Iowa by the evening and finally any remnant showers into eastern Iowa later tonight. As the front continues to advance east, additional storms will redevelop on Thursday over eastern Iowa before exiting later Thursday night. Here are the average rain totals…

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The next storm system hits later today with more storm chances. Details below… A frontal system will slide through the forecast area later today through Monday. Scattered storms will develop over west and central Iowa middle to late afternoon along a limited axis of instability. A couple of these storms may produce gusty winds across central and southern Iowa. This will become more scattered into the evening across the forecast area before decreasing overnight. Then a stronger impulse will hit central and southern Iowa on Monday. This activity will taper off late Monday night as the system works off to…

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