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 major changes.
KEY MESSAGES
1) Extreme heat through Thursday.
2) Hot and humid conditions will continue into the holiday weekend when the chance for showers and storms returns.
DISCUSSION
KEY MESSAGE 1)
Surface high pressure remains centered just south of the Ohio Valley and anomalous upper level ridging stays anchored in place through at least Thursday. Hot and humid conditions persist. Forecast highs in the lower to middle 90s, along with dew points in the middle 70s, result in peak heat index values around the 105 mark with higher readings possible. An Extreme Heat Warning is in place through Thursday to account for the high heat and humidity. Overnight lows in the 70s offer little relief from the heat.
KEY MESSAGE 2)
Ridging may start to break down on Friday allowing chances for convection and less confidence in the extreme heat. However, conditions will still be hot and humid through the holiday weekend. Outdoor activities could see some impacts from isolated to scattered thunderstorm activity especially during the afternoon and evening hours.
AVIATION /00Z WEDNESDAY THROUGH SUNDAY/
A big dome of high pressure over the region will offer continued dry weather and hot temperatures. Fair weather cumulus clouds that developed are dissipating, giving way to clear skies. Light winds, clear skies and high low level moisture will lead fog development again tonight. The fog will be most dense in river valleys. Have IFR conditions at KLUK valley location. Otherwise...have MVFR visibility restriction at KILN and KLCK. The fog will improve quickly Wednesday morning with a return to VFR conditions.
Southwest winds at less than 10 kts will increase to around 10 kts Wednesday afternoon.
OUTLOOK...Thunderstorms are possible on Friday and Saturday.
ILN WATCHES/WARNINGS/ADVISORIES
OH...Extreme Heat Warning until 8 PM EDT Thursday for OHZ026-034-035- 042>046-051>056-060>065-070>074-077>082-088. KY...Extreme Heat Warning until 8 PM EDT Thursday for KYZ089>100. IN...Extreme Heat Warning until 8 PM EDT Thursday for INZ050-058-059-066- 073>075-080.
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