497  
FXUS65 KGJT 282316  
AFDGJT  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GRAND JUNCTION CO  
516 PM MDT TUE MAR 28 2017  
   
SHORT TERM
 
(TONIGHT THROUGH WEDNESDAY NIGHT)  
ISSUED AT 355 PM MDT TUE MAR 28 2017  
 
DEEP UPPER LOW WILL MEANDER SLOWLY EASTWARD OVERNIGHT ACROSS  
CENTRAL AND SOUTHERN NEW MEXICO. AS THIS LOWS WOBBLES AWAY, DEEP  
NORTH TO NORTHEASTERLY FLOW SETS UP SHOP ACROSS THE FORECAST AREA,  
ALREADY EVIDENT IN LATEST RADAR RETURNS WITH SHOWERS HEADING  
SOUTHWEST. BULK OF THE HEAVIEST SNOW HAS ENDED FOR MOST OF OUR  
MOUNTAINS AND WITH NORTHEASTERLY FLOW SETTING UP, POTENTIAL FOR  
SIGNIFICANT SNOW WILL BE DIMINISHED OVER JUST ABOUT THE ENTIRE  
FORECAST AREA. OF COURSE THERE ARE EXCEPTIONS TO THAT RULE SUCH AS  
THE NORTH SLOPES OF THE EASTERN UINTA MOUNTAINS AND THE LA SAL  
MOUNTAINS IN EASTERN UTAH AND ALONG THE NORTHERN SLOPES OF THE  
SAN JUANS, ESPECIALLY AREAS SUCH AS THE UNCOMPAHGRE GORGE AND IN  
THE TOWN OF OURAY. NORTHERLY FLOW LOOKS TOO STRONG TO GET A DECENT  
GORGE EVENT GOING AND THE MOISTURE WILL BE ERODING AWAY FROM THE  
EASTERN UINTA'S RATHER QUICKLY THIS EVENING, WITH GOES IMAGERY  
SHOWING DRY AIR MARCHING STEADILY EASTWARD THIS AFTERNOON. WITH  
SOME RESERVED HESITATION, DROPPED ALL OF THE EASTERN UTAH  
MOUNTAINS FOR THE WINTER WEATHER ADVISORIES (RESERVED AS WE COULD  
SEE ANOTHER 2 TO 4 INCHES IN THE LA SALS THIS EVENING, BUT IMPACT  
ON TRAVEL IS MINIMAL DUE). THE SOUTHWEST SAN JUANS WERE ALSO  
DROPPED WITH ONLY SCATTERED SNOW SHOWERS EXPECTED THROUGH TONIGHT  
WITH WINDS MORE DOWNSLOPE AND DRYING IN ON THE SOUTHERN SLOPES.  
 
THAT LEAVES US WITH THE CENTRAL MOUNTAINS AND NORTHWEST SAN JUANS  
IN WESTERN COLORADO WITH HIGHLIGHTS THROUGH TONIGHT. HEAVIEST  
SNOWFALL ACCUMULATIONS WILL REMAIN AT OR ABOVE THE 9K LEVEL,  
ALTHOUGH SOME ACCUMULATIONS SNOW WILL FALL DOWN TO AS LOW AS 6K  
OVERNIGHT AS COLDER AIR ROLLS BACK IN. CURRENT HIGHLIGHTS FOR  
THESE AREA WILL REMAIN IN EFFECT FOR ANOTHER 3 TO 6 INCHES OF SNOW  
FOCUSING ON NORTH AND NORTHEAST FACING SLOPES. ELSEWHERE, IT'S THE  
SCATTERED RAIN AND SNOW SHOWERS THROUGH THIS EVENING, BEFORE  
THINGS SHUT DOWN LATE TONIGHT AS WE STABILIZE.  
 
ALSO EXPECTED TO SEE BREEZY TO WINDY CONDITIONS THIS EVENING  
ACROSS SOUTHEAST UTAH INTO THE FOUR CORNERS REGION, INCLUDING  
CORTEZ AS GRADIENT TIGHTENS SIGNIFICANTLY AT THE 700 MB LEVEL.  
STRONGEST WINDS ARE EXPECTED TO REMAIN ALOFT AS INVERSIONS SET IN,  
BUT ANY SHOWERS COULD DRIVE DOWN GUSTS IN THE 40 TO 50 MPH RANGE.  
WITH LOSS OF HEATING, BULK OF SHOWERS WILL BE DISSIPATING AND  
MOMENTUM LOST, SO NO PLANS ON WIND HIGHLIGHTS AT THIS TIME.  
 
AFTER TONIGHT, THE UPPER LOW WILL BE KICKING OUT ACROSS THE TEXAS  
PANHANDLE AND ARRIVING OVER THE CENTRAL PLAINS STATES BY WEDNESDAY  
NIGHT. EXPECT LINGERING SHOWERS EARLY WEDNESDAY WITH LOW SCUD  
CLOUDS HANGING AROUND AND SOME PATCHY FOG IN THE VALLEYS,  
ESPECIALLY THOSE THAT SEE LATE CLEARING AND RECEIVED MOISTURE OVER  
THE PAST 24 HOURS. TEMPERATURES WILL BE RUNNING NEAR TO A FEW  
DEGREES ABOVE SEASONAL NORMS THROUGH THIS PERIOD.  
   
LONG TERM
 
(THURSDAY THROUGH TUESDAY)  
ISSUED AT 355 PM MDT TUE MAR 28 2017  
 
THE ACTIVE AND PROGRESSIVE PATTERN WILL BE STICKING AROUND FOR  
SEVERAL MORE DAYS. FLAT, TRANSITORY RIDGE WORKS EAST ON THURSDAY,  
DRIVING TEMPS UPWARDS INTO THE 5 TO 10 DEGREES ABOVE NORMAL RANGE.  
THIS WARMING LOOKS SHORT-LIVED AS ANOTHER DEEPENING LOW DRIVES  
SOUTHEAST INTO THE GREAT BASIN THURSDAY NIGHT AND FRIDAY. THIS  
SYSTEM LOOKS MORE AND MORE INTERESTING BY THE DAY AS THE LOW  
CLOSES AND MOVES SLOWLY INTO THE FOUR CORNERS AREA BY FRIDAY AND  
FRIDAY NIGHT. GFS ENSEMBLES IN FAIRLY GOOD AGREEMENT WITH SUBTLE  
SHIFTS IN PLACEMENT RANGING FROM NEAR CORTEZ TO NEAR BY SATURDAY  
MORNING. THE EURO AND CANADIAN MODELS ARE FOLLOWING SIMILAR  
TRACKS AND ALL WOULD SUGGEST THAT WE WILL SEE ANOTHER ROUND OF  
HEAVY MOUNTAINS SNOW WITH A MIXED BACK OF VALLEY PRECIPITATION.  
 
SIGNIFICANT COOLING ALSO EXPECTED TO ARRIVE OVERNIGHT THURSDAY  
THROUGH FRIDAY WITH 700 MB TEMPERATURES DROPPING FROM +6 TO AS  
LOW AS -10C BY SATURDAY MORNING OVER THE SAN JUANS. EXPECTED DEEP  
SOUTHERLY FLOW AHEAD OF THE DIGGING LOW WILL DRIVE LIMITED  
MOISTURE NORTHEAST ACROSS THE AREA WITH SOME SHOWERS EXPECTED OVER  
THE SAN JUANS AFTER MIDNIGHT THURSDAY. SNOW LEVELS START OFF HIGH  
AGAIN, BUT WILL DROP AS THE COLDER AIR WORKS THROUGH. SOUTHERN  
VALLEYS FROM CORTEZ TO DURANGO AND PAGOSA SPRINGS WILL AGAIN BE ON  
THE CUSP OF POTENTIALLY SEEING SEVERAL INCHES OF WET SNOW, BUT  
LEANING TOWARD MORE OF A RAIN EVENT ONCE AGAIN AS THE COLDEST AIR  
DOESN'T ARRIVE OVER THE SOUTHERN VALLEYS UNTIL AFTER THE DEEPEST  
MOISTURE HAS SHIFTED OUT AND THE FLOW HAS SHIFTED TO THE NORTH AND  
NORTHEAST, WHICH IS NOT ALL THAT FAVORABLE FOR SIGNIFICANT  
PRECIPITATION SOUTH OF THE SAN JUANS. ONE AREA THAT COULD DO QUITE  
WELL ON THE BACK SIDE OF THIS LOW WILL BE NORTHWEST SAN JUANS,  
SPECIFICALLY THE UNCOMPAHGRE GORGE JUST SOUTH OF OURAY AS WEAKER  
700 MB FLOW ANTICIPATED WITH THE UPPER LOW MORE NORTH OF THE  
SYSTEM CURRENTLY IMPACTING THE AREA.  
 
THE EASTERN UINTAS AND LA SALS ARE ALSO SHOWING PROMISE FOR  
POTENTIALLY HEAVY SNOWFALL WITH THIS SECOND SYSTEM BETWEEN FRIDAY  
AND SATURDAY MORNING. MOST OF OUR REMAINING MOUNTAIN ZONES WILL  
SEE DECENT SNOWFALL, BUT BEST CHANCES FOR HEAVIER ACCUMULATIONS  
WILL BE ACROSS THE SAN JUANS, EASTERN UINTAS AND THE LA SALS,  
WHICH ARE ALL HIGHLY DEPENDED ON HOW THIS LOW SETS UP AND JUST  
WHERE IT STALLS OR SLOWS DOWN.  
 
THE ONE BIG MISSING INGREDIENT FOR THIS ENTIRE SYSTEM WILL BE A  
DEEP SOURCE OF MOISTURE AS WE AREN'T TAPPING MUCH IN THE WAY OF  
ADDITIONAL OR ADD-ON JUICE TO THE STORM. SO EFFICIENCY IS THE KEY  
TO MAKING THIS NEXT ROUND EXCITING.  
 
THIS LOW EXITS LATE SATURDAY WITH SUNDAY AND SUNDAY NIGHT COMING  
IN DRY WITH ANOTHER RIDGE ROLLING THROUGH AHEAD OF YET ANOTHER  
WAVE THAT IS COMING ACROSS OPEN, WHICH TENDS TO FAVOR OUR NORTHERN  
AND CENTRAL MOUNTAINS. MORE ON THAT SYSTEM LATER.  
 
TEMPERATURES WILL BE JUMPING AROUND, TYPICAL OF SPRING-TIME IN THE  
ROCKIES AND WHEN PUT ALL TOGETHER, WILL PROBABLY AVERAGE OUT TO  
AROUND NORMAL FOR THIS TIME OF YEAR.  
 

 
   
AVIATION
 
(FOR THE 00Z TAFS THROUGH 00Z WEDNESDAY EVENING)  
ISSUED AT 502 PM MDT TUE MAR 28 2017  
 
CONDITIONS WILL BE SPATIALLY VARIABLE ACROSS THE REGION TONIGHT  
AS A STRONG STORM MOVES ENE FROM EASTERN NEW MEXICO TO THE  
PANHANDLES. ISOLATED THUNDERSTORMS WILL CONTINUE OVER SOUTHWEST CO  
UNTIL ABOUT 02Z. MVFR AND OCCASIONAL IFR CONDITIONS WILL CONTINUE  
AT KASE, KEGE, AND KTEX UNTIL ABOUT 03Z WITH CIGS TO ILS  
BREAKPOINTS OVER MUCH OF THE REST OF THE AREA. FLIGHT CONDITIONS  
WILL IMPROVE MORE AFTER ABOUT 09Z. AS THE LOW CENTER MOVES EAST  
AND NORTHEAST, CLOUDS AND PRECIPITATION WILL SLOWLY ERODE FROM  
WEST TO EAST ACROSS THE AREA.  
 
UNTIL ABOUT 09Z WESTERN CO WILL BE OBSCURED THEN CONDITIONS WILL  
GRADUALLY IMPROVE. VFR CONDITIONS SHOULD PREVAIL AFTER ABOUT 16Z.  
 

 
   
GJT WATCHES/WARNINGS/ADVISORIES
 
 
CO...WINTER WEATHER ADVISORY UNTIL NOON MDT WEDNESDAY FOR COZ009-010-  
012-013-018.  
 
UT...NONE.  

 
 

 
 
SHORT TERM...JDC  
LONG TERM...JDC  
AVIATION...CC  
 
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