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Started By
Message
re: Wintry Mix possible for Gulf Coast Tuesday & Wednesday.
Posted on 2/12/15 at 6:44 pm to TigahRag
Posted on 2/12/15 at 6:44 pm to TigahRag
quote:
Why not? What's the difference between these maps and the ones you posted last winter?
here's the forecast discussion from NOAA...no mention of wintry weather.
[quote].LONG TERM...
HEADING INTO MONDAY...THE ZONAL FLOW PATTERN WILL CONTINUE TO
DOMINATE IN THE UPPER LEVELS. IN THE LOW LEVELS...THE WEAK
FRONTAL BOUNDARY WILL CONTINUE TO SINK TO THE SOUTH MAINLY DUE TO
DENSITY DIFFERENTIALS BETWEEN THE COLDER AIR TO THE NORTH OF THE
FRONT AND THE WARMER AIR TO THE SOUTH. THIS FRONT SHOULD BE
STALLED OVER THE FORECAST AREA BY THE AFTERNOON HOURS. ONSHORE
FLOW OFF THE GULF WILL CONTINUE TO PUSH MOISTURE INTO THE REGION
AND PW VALUES ARE EXPECTED TO BE IN THE 1.5 INCH RAIN WHICH IS
CLOSE TO THE 99TH PERCENTILE OF THE CLIMATOLOGICAL MAX
PRECIPITABLE WATER RANGE. AS THIS WARM AND MORE MOIST ONSHORE FLOW
AT THE SURFACE ENCOUNTERS THE FRONT...IT WILL BE ISENTROPICALLY
FORCED UPWARD OVER THE COOLER AND MORE STABLE LAYER BEHIND THE
FRONT. AS A RESULT...EXPECT TO SEE A BAND OF MODERATE RAINFALL
DEVELOP ALONG AND NORTH OF THE FRONT. THIS BAND OF RAIN IS
CURRENTLY EXPECTED TO BE NORTH OF THE I-10 CORRIDOR. RAINFALL
TOTALS OF AROUND AN INCH WILL BE POSSIBLE ON MONDAY IN THE
MODERATE RAIN BAND. SOUTH OF I-10 AND THE FRONT...MORE CONVECTIVE
TYPE SHOWERS ARE EXPECTED THROUGH THE DAY. THESE SHOWERS WILL BE
SCATTERED IN NATURE...SO A CONTINUOUS RAIN IS NOT EXPECTED ON
MONDAY. HAVE WENT WITH CHANCE POPS FOR SOUTHERN ZONES AND LIKELY
POPS ELSEWHERE. TEMPERATURES WILL ALSO BE WARM SOUTH OF THE
FRONT...WITH HIGHS IN THE UPPER 60S FOR METRO NEW ORLEANS AND
COASTAL LOUISIANA.
THE SAME OVERALL PATTERN IS EXPECTED TO LINGER INTO MONDAY NIGHT
AND ANOTHER INCH OF RAINFALL WILL BE POSSIBLE NORTH OF THE FRONTAL
BOUNDARY. THERE COULD ALSO BE A SMALL WINDOW OF INCREASED CAPE AND
OVERALL INSTABILITY MONDAY NIGHT INTO EARLY TUESDAY. THIS COULD
ALLOW FOR SOME ISOLATED THUNDERSTORM ACTIVITY TO FORM.
FORTUNATELY...THIS THUNDERSTORM ACTIVITY SHOULD BE ELEVATED...AND
NO SEVERE WEATHER IS EXPECTED. AT MOST...SOME BRIEF HEAVY
DOWNPOURS AND AN OCCASIONAL LIGHTNING STRIKE COULD ACCOMPANY THESE
THUNDERSTORMS.
LARGE MODEL DIFFERENCES ARISE BETWEEN THE GFS AND ECMWF FOR MARDI
GRAS. AFTER REVIEWING OVERALL MODEL TRENDS FROM THE LAST FEW
RUNS...HAVE DECIDED TO TREND TOWARD THE EURO. THIS SOLUTION IS
SLOWER THAN THE CURRENT GFS...AND HOLDS OFF FRONTAL PASSAGE TO
TUESDAY NIGHT. GOING WITH THE EURO...A STRONG SHORTWAVE TROUGH
WILL DIG INTO THE SOUTHERN PLAINS THROUGH THE DAY ON TUESDAY AND
INTO TUESDAY NIGHT. AS THIS TROUGH DEEPENS...A SURFACE LOW WILL
FORM OVER EASTERN TEXAS AND THEN MOVE DIRECTLY ACROSS THE
FORECAST AREA DURING THE DAY ON TUESDAY. IN ADVANCE OF THE
LOW...WARM FRONTAL PROCESSES WILL DEVELOP...AND THE LINGERING
FRONT SHOULD SURGE BACK INTO CENTRAL MISSISSIPPI. THIS WILL ALLOW
FOR WARMER TEMPERATURES TO SPREAD INLAND...AND EXPECT TO SEE HIGHS
RISE INTO THE MIDDLE TO UPPER 60S. EXPECT TO SEE NUMEROUS SHOWERS
AND SOME ISOLATED THUNDERSTORMS OVER THE ENTIRE AREA MARDI GRAS
MORNING.
AS THE LOW MOVES TO THE EAST MARDI GRAS EVENING...A STRONG COLD
FRONT WILL MOVE INTO THE AREA. RAIN AND A FEW EMBEDDED ELEVATED
THUNDERSTORMS WILL CONTINUE TO BE A RISK INTO MARDI GRAS
AFTERNOON IN ADVANCE OF THIS FRONT. ONCE THE FRONT MOVES
THROUGH...DRIER AIR ALOFT WILL BEGIN TO ADVECT IN. THIS WILL BEGIN
TO CUT OFF THE RAIN CHANCES...AND ONLY EXPECT SCATTERED SHOWERS
FOR MARDI EVENING AND NIGHT. AFTER MIDNIGHT...THE DRY AIR WILL BE
FIRMLY ENTRENCHED...AND RAIN CHANCES WILL COME TO AN END.
HOWEVER...A VERY COLD AIRMASS WILL BEGIN TO ADVECT INTO THE
REGION. AS A RESULT...EXPECT TO SEE A LOW LEVEL INVERSION
DEVELOP WHICH WILL KEEP LINGERING CLOUD COVER IN PLACE THROUGH
WEDNESDAY MORNING. TEMPERATURES WILL BE SIGNIFICANTLY
COLDER...WITH LOWS DIPPING INTO THE UPPER 20S AND 30S BY WEDNESDAY
MORNING.
DEEP LAYER NORTHWEST FLOW AND VERY COLD AIR WILL LINGER OVER THE
AREA FOR WEDNESDAY AND THURSDAY. OVERNIGHT LOWS WILL COOL INTO THE
20S AND LOWER 30S OVER MOST OF THE FORECAST AREA WEDNESDAY
NIGHT...WITH A HARD FREEZE POSSIBLE OVER PARTS OF SOUTHWEST
MISSISSIPPI AND THE NORTHSHORE. TEMPERATURES WILL GENERALLY
AVERAGE 15 TO 20 DEGREES BELOW AVERAGE FOR WEDNESDAY AND WEDNESDAY
NIGHT.
[quote]
Posted on 2/12/15 at 6:51 pm to gaetti15
I get all of that .. Last winter he was arguing with anyone that disagreed with him and poo poo'ed any forecast that didn't include a blizzard in Nola
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