National Weather Service, Weather Prediction Center College Park Maryland
3:07 P.M. Eastern Daylight Time Tuesday July 09 2024
Valid 00:00 Coordinated Universal Time Wednesday July 10 2024 to 00:00 Coordinated Universal Time Friday July 12

  • Post-Tropical Cyclone Beryl to bring heavy rain and flooding to parts of the Midwest, eastern Great Lakes, and Northeast tonight and Wednesday.
  • Dangerous heat and record high temperatures to continue for much of the West into Thursday.
  • High humidity in the East will support heat indices of 100-110F from the Southeast to the Mid-Atlantic on Wednesday and Major to Extreme Heat Risk.


  • Post-Tropical Cyclone Beryl will continue its northeastward trek into Wednesday, with an associated precipitation shield extending to its northeast ahead of a warm front.
  • Both severe weather and flash flooding are possible through parts of the Midwest/Ohio Valley this evening.
  • Tornadoes are possible with severe weather and heavy rainfall could cause small river and roadway flooding, especially in urban areas.
  • Rainfall totals of 2-4 inches, with locally higher amounts, are expected.
  • On Wednesday, Beryl will continue northeastward through Ohio and into Ontario and rainfall will increase over northern areas of New York into New England.
  • Thunderstorms could be severe in some areas with some tornado potential.
  • The flash flooding threat will be greater over parts of northeastern New York into northern Vermont/New Hampshire, especially in hillier areas.
  • Elsewhere, showers and some thunderstorms are possible over parts of New Mexico, along the Gulf Coast, and into the Southeast/Mid-Atlantic.
  • In the West, the intense heat will continue for at least a few more days, with temperatures well above normal and reaching or exceeding daily record highs over many locations from Mexico to Canada west of the Rockies.
  • Excessive heat warnings or heat advisories are in effect for much of the area outside the high mountains, even including the foothills.
  • Temperatures well into the 100s/110s will be commonplace, resulting in a widespread Major to Extreme Heat Risk.
  • In addition to the record high daily temperatures, the early morning lows are also expected to set records across large portions of the West over the coming two mornings.
  • The multi-day length and record warm overnight temperatures will continue to cause heat stress to anyone without adequate cooling and hydration.
  • Elsewhere, temperatures will be cooler than average along the path of Post-Tropical Cyclone Beryl thanks to overcast skies and rain.
  • Ahead of its path, the East Coast will see another day of warm/hot temperatures well into the 90s from the Mid-Atlantic southward through the Carolinas.
  • The high humidity values will result in heat index values over 100F for many of these areas.
  • This will also promote many record high minimum temperatures that only dip into the mid/upper 70s at night (and near 80 in some urban centers such as Baltimore and Washington, D.C.).
  • Heat advisories are in effect for much of the I-95 corridor between the Appalachians and the coast.
  • By Thursday, temperatures May cool by a couple degrees as the cold front associated with Beryl reaches the East Coast but May stall across the region.
  • This could finally bring some much needed rain to the Mid-Atlantic.


By Guest