textproduct: Wilmington
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
WHAT HAS CHANGED
No significant changes.
KEY MESSAGES
1) A low pressure system will move through the Ohio Valley tonight through Wednesday, bringing additional showers and thunderstorms.
2) Extended period of cooler conditions settles in over the region midweek, continuing into the weekend.
DISCUSSION
KEY MESSAGE 1)
Surface cold front to stall out late in the day across northern KY. A mid level shortwave pivoting through the Ohio Valley will be the focus heading into tonight. This shortwave will result in the development of surface low pressure, which will ride up along the the front through the early afternoon on Wednesday. Expect The low pressure to provide an additional round of showers and thunderstorms. The storms develop toward midnight across northern KY and then spread northeast across the entire area thru the overnight hours. The severe threat remains low with marginal instability becoming elevated this evening. Cooler air and lingering showers are forecast for Wednesday night as the low pressure pulls away to the east.
KEY MESSAGE 2)
A deep longwave trough settles in over the Midwest and Great Lakes by Thursday, leading to an extended period of below normal temperatures that will stretch through the weekend. The coolest temperatures are forecast on Friday and Saturday, with high temperatures between 55 and 60. The potential for frost looks possible Friday night and Saturday night.
Drier conditions will accompany the cooler air weather. There will be a few opportunities for light rainfall. Lingering showers are expected on Thursday, with a secondary cold front providing additional showers on Friday. Following the surface high pressure this weekend, the next chance for rain is on Monday.
AVIATION /00Z WEDNESDAY THROUGH SUNDAY/
Clouds will thicken as showers increase after midnight tonight. Weak, elevated instability around the Cincinnati terminals could allow for an isolated storm initially. Surface low pressure shifting east along a frontal boundary will cause winds to veer from westerly to northeasterly tonight, then back to northwesterly on Wednesday behind the low. Cloud bases will drop early Wednesday morning, and likely remain below 1,000 feet until afternoon when the increasing northwesterly gusts bring in slightly drier air.
OUTLOOK...Significant weather is not expected.
ILN WATCHES/WARNINGS/ADVISORIES
OH...None. KY...None. IN...None.
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