945
FXUS65 KGGW 260053 AAA
AFDGGW
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE GLASGOW MT
653 PM MDT MON MAR 25 2019
DISCUSSION
SEND AN UPDATE THIS EVENING TO FINE TUNE THE TEMPERATURES AND
WINDS BASED ON THE LATEST OBSERVATIONS AND THE BEST NEAR/SHORT
TERM MODEL CONSENSUS I COULD FIND. WITH CONTINUING CLEARING SKIES
AND RECENT WETTING RAINS, WE EXPECT FOG TO DEVELOP TONIGHT. WILL
KEEP A CLOSE EYE OUT. BMICKELSON
PREVIOUS DISCUSSION: MUCH QUIETER PATTERN AHEAD FOR THE NEXT DAY
OR TWO BEFORE THE UPPER LEVEL RIDGING OVERHEAD BEGINS TO BREAK
DOWN. MOST OF THE CWA WILL STAY DRY THROUGH THE WEEKEND AND INTO
EARLY NEXT WEEK, WITH THE EXCEPTION OF OUR FAR SOUTHERN ZONES.
SHORT TERM (TONIGHT THROUGH WEDNESDAY NIGHT)...
WE HAVE A GOOD SETUP FOR DENSE FOG TONIGHT: RECENT RAINFALL,
SNOWMELT (AND ICE MELT FROM YESTERDAY / LAST NIGHT'S FREEZING
RAIN), LIGHT WINDS, AND A MILDER AIRMASS TRYING TO SNEAK IN. THE
LOCATIONS WITH THE BEST SETUP FOR FOG TONIGHT ARE NORTH OF THE MO
RIVER. VISIBILITIES SHOULD DROP CONSIDERABLY AFTER 9 PM TONIGHT,
WITH LOWEST VISIBILITIES AFTER ABOUT MIDNIGHT UNTIL ABOUT 9 AM.
WENT AHEAD AND ISSUED A DENSE FOG ADVISORY FOR ALL ZONES NORTH OF
THE MO RIVER EXCEPT SOUTHWEST PHILLIPS COUNTY. TEMPERATURES SHOULD
DIP BELOW FREEZING (BARELY) AS WELL, WHICH SHOULD ALSO LEAD TO
SOME AREAS OF FREEZING FOG.
THE FOG SHOULD LINGER IN SOME SPOTS--MAINLY NORTHERN AND EAST-
CENTRAL VALLEY, DANIELS, AND NORTHWEST ROOSEVELT COUNTIES--INTO
THE AFTERNOON HOURS. THIS AREA STILL HAS SOME SNOW COVER PER
WEBCAMS AND NOHRSC SITE, AND THE LINGERING FOG AND WHATEVER SNOW
COVER IS LEFT SHOULD KEEP TEMPERATURES DOWN IN THIS AREA. FURTHER
SOUTH, TEMPERATURES WILL BE MUCH WARMER THAN THEY HAVE BEEN IN A
WHILE, WITH SOME PARTS OF THE SOUTHERN CWA THREATENING TO HIT 70.
THERE'S POTENTIAL FOR FOG ONCE AGAIN TOMORROW NIGHT NORTH, BUT
THE WINDS SHOULD BE A TOUCH STRONGER WHICH COULD LOWER THE CHANCES
OF IT DEVELOPING. A MIX OF RAIN AND SNOW IS POSSIBLE SOUTH OF A
ZORTMAN TO WIBAUX LINE LATE TOMORROW AFTERNOON INTO TOMORROW NIGHT
AS WELL.
LONG TERM (THURSDAY AND BEYOND)...
MODELS DISAGREE ON THE DETAILS REGARDING THE NORTHERN EXTENT OF
PRECIPITATION THURSDAY AND FRIDAY, SO GENERALLY KEPT POPS LOW.
AFTER A COUPLE OF DAYS (THU-FRI) WITH COOLER TEMPERATURES, THEY
SHOULD REBOUND AGAIN AS RIDGING TRIES TO BUILD BACK IN OVER THE
AREA.
AVERY
AVIATION
FLIGHT CAT: BECOMING IFR TONIGHT, WITH VLIFR EXPECTED AT KGGW &
KOLF OVERNIGHT INTO TUESDAY MORNING.
DISCUSSION: FOG IS EXPECTED TO DEVELOP TONIGHT, WITH BRIEF PERIODS
OF FREEZING FOG POSSIBLE, LONGEST AT KOLF. REDUCED VISIBILITIES
AND LOWERED CEILINGS AT KOLF & KGGW SHOULD IMPACT AIRPORT
OPERATIONS THROUGH ABOUT 15Z ON TUESDAY BEFORE CONDITIONS BEGIN TO IMPROVE.
WINDS: LIGHT SE WINDS (LESS THAN 5 KTS) AT KGGW & KOLF OVERNIGHT;
LIGHT S WINDS AT KGDV & KSDY. WINDS SHIFT TO THE SOUTH AND
SOUTHWEST ON TUESDAY BETWEEN 5 TO 15 KTS BY THE AFTERNOON.
AVERY/BMICKELSON
GLASGOW WATCHES/WARNINGS/ADVISORIES
DENSE FOG ADVISORY UNTIL 11 AM MDT TUESDAY FOR CENTRAL AND
SOUTHEAST PHILLIPS...CENTRAL AND SOUTHERN VALLEY...DANIELS...
EASTERN ROOSEVELT...NORTHERN PHILLIPS...NORTHERN VALLEY...
SHERIDAN...WESTERN ROOSEVELT.
WEATHER.GOV/GLASGOW
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