UPDATED Aug. 17, 2020
The National Weather Service (NWS) in Glasgow expanded its Heat Advisory for Monday and Tuesday, August 17–18, to include all of Richland, Roosevelt, Dawson and Prairie counties.
The NWS on Sunday issued a "Heat Advisory" for northeast Montana early this week.
On Monday morning, the NWS issued a follow-up bulletin notifying eastern Montanans to expect extremely hot temperatures, citing a "high confidence" for "Hot Conditions."
• A ridge of high pressure aloft is allowing a hot air mass to move into northeast Montana
• Daytime high temperatures well into the 90s to near 100 are expected Monday and Tuesday
• Nighttime low temperatures in the mid-60s to near 70 (near record) are expected for Monday and Tuesday
• Very hot conditions are expected into the middle of this week, with poor temperature recovery at night