Travel & RV Weather Forecast Monday 18 July

Montana and northwest Wyoming may see high winds this afternoon and tonight from a summer low pressure system; these winds will spread across the Dakotas on Tuesday.
Severe thunderstorms are expected across the Northern tier of the U.S. over the next couple of days.
Locally heavy rain and flash flooding will be possible today and tonight in the East.
Dangerous heat is likely across the Plains over the next few days.

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Pacific:

— Central CA San Joaquin Valley: Excessive Heat Warnings through this evening. High temperatures 103-108 deg F each day. I-5, CA-99 impacted.

Mountain:

— Portions of eastern ID; southwest MT; west-central, central, east-central and northeast WY; northwest NE: Wind Advisories (MT) and strong winds this afternoon and early this evening. Gusts 30-40 mph. I-15, I-25, I-84, I-90 impacted.

— North-central, central and southwest MT: High Wind Warnings this afternoon and tonight. Gusts to 65 mph. I-15, I-90 impacted.

— Northeast MT and northwest ND: Widely scattered severe thunderstorms possible this afternoon in MT, then spreading eastward. Very strong winds and large hail are the primary threats.

— Northern AZ lower elevations of Glen Canyon and Grand Canyon: Excessive Heat Warnings through Wednesday evening. Temperatures as high as 112 deg F.

Central:

— Northern ND, northern MN, northern WI: Widely scattered severe thunderstorms possible this evening. Very strong winds and large hail are the primary threats. I-29, I-35, I-94 potentially impacted.

— Southern ND; most of SD: Strong winds gusting 35-50 mph likely Tuesday afternoon and evening. I-29, I-90, I-94 impacted.

— Northeast ND; northern and northeast MN; northern and central WI: Widely scattered thunderstorms possible Tuesday and Tuesday night. Severe wind gusts and large hail are the primary threats. I-29, I-35, I-39, I-43, I-94 potentially impacted.

— North-central, Central and south-central ND: Excessive Heat Warnings this afternoon and evening. Heat index values may reach 108 deg F.

— Most of OK; central and much of northern TX: Excessive Heat Warnings through Tuesday evening. Heat index values above 110 deg F. I-20, I-30, I-35, I-40, I-44, I-45 impacted.

Eastern:

— MI Upper Peninsula: Widely scattered severe thunderstorms possible this evening and again Tuesday and Tuesday night. Very strong winds and large hail are the primary threats.

— Southern and southeast OH; adjacent KY; western WV; southwest PA: Flood Watch through midday today for excessive rainfall. I-64, I-70, I-71, I-75, I-77, I-79 potentially impacted.

— Northern and eastern NY; western MA; western CT; VT; NH; most of ME away from the immediate coast: Heavy rains today and tonight. Isolated flooding possible. I-81, I-84, I-88, I-87, I-89, I-91, I-93, I-95 potentially impacted.