Area Forecast Discussion

Aberdeen (ABR)
Albany (ALY)
Albuquerque (ABQ)
Amarillo (AMA)
Anchorage (AFC)
Austin/San Antonio (EWX)
Baltimore MD/Washington (LWX)
Billings (BYZ)
Binghamton (BGM)
Birmingham (BMX)
Bismarck (BIS)
Blacksburg (RNK)
Boise (BOI)
Boston/Norton (BOX)
Brownsville (BRO)
Buffalo (BUF)
Burlington (BTV)
Caribou (CAR)
Charleston (CHS)
Charleston (RLX)
Cheyenne (CYS)
Chicago (LOT)
Cleveland (CLE)
Columbia (CAE)
Corpus Christi (CRP)
Denver/Boulder (BOU)
Des Moines (DMX)
Detroit/Pontiac (DTX)
Dodge City (DDC)
Duluth (DLH)
Elko (LKN)
El Paso (EPZ)
Eureka (EKA)
Fairbanks (AFG)
Flagstaff (FGZ)
Forth Worth/Dallas (FWD)
Gaylord (APX)
Glasgow (GGW)
Goodland (GLD)
Grand Forks (FGF)
Grand Junction (GJT)
Grand Rapids (GRR)
Gray (GYX)
Great Falls (TFX)
Green Bay (GRB)
Greenville-Spartanburg (GSP)
Guam (GUM)
Hanford (HNX)
Hastings (GID)
Honolulu (HFO)
Houston/Galveston (HGX)
Huntsville (HUN)
Indianapolis (IND)
Jackson (JAN)
Jackson (JKL)
Jacksonville (JAX)
Juneau (AJK)
Kansas City/Pleasant Hill (EAX)
Key West (KEY)
La Crosse (ARX)
Lake Charles (LCH)
Las Vegas (VEF)
Lincoln (ILX)
Little Rock (LZK)
Los Angeles/Oxnard (LOX)
Louisville (LMK)
Lubbock (LUB)
Marquette (MQT)
Medford (MFR)
Melbourne (MLB)
Memphis (MEG)
Miami (MFL)
Midland/Odessa (MAF)
Milwaukee/Sullivan (MKX)
Missoula (MSO)
Mobile (MOB)
Morristown (MRX)
Mount Holly (PHI)
Nashville (OHX)
New Orleans/Baton Rouge (LIX)
Newport/Morehead City (MHX)
New York City (OKX)
Norman (OUN)
Northern Indiana (IWX)
North Platte (LBF)
Omaha/Valley (OAX)
Paducah (PAH)
Pago Pago (PPG)
Peachtree City (FFC)
Pendleton (PDT)
Phoenix (PSR)
Pittsburgh (PBZ)
Pocatello (PIH)
Portland (PQR)
Pueblo (PUB)
Quad Cities (DVN)
Raleigh (RAH)
Rapid City (UNR)
Reno (REV)
Riverton (RIW)
Sacramento (STO)
Salt Lake City (SLC)
San Angelo (SJT)
San Diego (SGX)
San Francisco (MTR)
San Juan (SJU)
Seattle (SEW)
Shreveport (SHV)
Sioux Falls (FSD)
Spokane (OTX)
Springfield (SGF)
State College (CTP)
St Louis (LSX)
Tallahassee (TAE)
Tampa (TBW)
Topeka (TOP)
Tucson (TWC)
Tulsa (TSA)
Twin Cities/Chanhassen (MPX)
Wakefield (AKQ)
Wichita (ICT)
Wilmington (ILN)
Wilmington, NC (ILM)

Letterhead and timestamp

000 FXUS65 KGGW 211928 AFDGGW Area Forecast Discussion National Weather Service Glasgow MT 128 PM MDT Tue Jul 21 2026

KEY MESSAGES

- A warming trend through the week will bring triple digit temperatures by Friday or Saturday.

- Mainly dry conditions with only an isolated thunderstorm Thursday night.

- Drier and breezier conditions Friday and Saturday will increase fire weather concerns.

DISCUSSION

WEATHER PATTERN OVERVIEW:

Monsoonal moisture flowing north that is interacting with a zonal jet stream flow has resulted in mainly cloudy skies across northeast Montana this afternoon. The mid-level clouds should clear from north to south tonight allowing temps to drop into the 50s north to the 60s south by Wednesday morning.

Sunshine should allow temperatures to begin warming Wednesday, topping out in the 80s across the CWA. Monsoonal moisture streaming north should halt near southern Montana but clouds will increase across the CWA Wednesday night. Showers should stay south of the CWA.

An upper ridge over the western states will build into Montana this week with temps warming into Friday. Look for highs Friday to reach the 90s north to the low 100s south. West winds will also increase as a surface low passes east to the northeast of us. If fuels dry out enough, there could be Fire Weather concerns.

Somewhat lighter winds are expected Saturday but slightly lower humidities will keep the Fire Weather concerns alive.

Slightly cooler conditions are expected Sunday but not enough to remove the Fire Weather concerns.

Lighter winds and higher humidity, especially in the northeast zones should continue to hack away at the Fire Weather concerns Monday.

FORECAST CONFIDENCE & DEVIATIONS: Going NBM forecast looked good today and didn't stray away with this package. Some shower potential Thursday night may allow for an oportunity to become more specific as time draws closer. TFJ

AVIATION

LAST UPDATE: 1930Z

FLIGHT CAT RANGE: VFR

DISCUSSION: Mid-level clouds will gradually clear from northwest to southeast tonight. Winds will remain about 10 kts or so from the SE.

DENSITY ALTITUDE issues will begin to return to the terminals Friday through the Weekend.

TFJ

GGW WATCHES / WARNINGS / ADVISORIES

None.

weather.gov/glasgow