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January 2012 General Discussion/Obs


KokomoWX

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The recently updated CFS forecast for January is the lolz. Not that I give much credence to it (whether it shows cold or warm)...and I just wanted to post it for laughs, but...well, lol.

Did the computer that make that outlook burst into flames? I wouldn't be shocked if it did.

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AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL

529 PM CST SUN DEC 25 2011

.DISCUSSION...

312 PM CST

FORECAST CHALLENGES TODAY INCLUDE PRECIP CHANCES/TYPES/AMOUNTS

MONDAY NIGHT INTO TUESDAY MORNING ALONG WITH TEMPS.

ANYONE DREAMING OF A GREEN CHRISTMAS DEFINITELY GOT THEIR WISH WITH

WEATHER MUCH MORE TYPICAL OF SAINT PATRICKS DAY LIKELY LEAVING JOLLY

SAINT NICK SINGING CHRISTMAS O`CAROLS THIS YEAR! DESPITE A DECENT

SHOT OF COLD AIR ADVECTION...A MILD START TO THE DAY AND NEARLY FULL

SUNSHINE THROUGH PEAK HEATING ALLOWED TEMPS TO WARM INTO THE MID 40S

TODAY. THE COLD AIR STRATOCUMULUS THAT GAVE ME A SCARE THIS MORNING

IS GETTING MUNCHED AWAY AT FROM THE WEST BY THE DRY AIR AND EVEN THE

BEGINNINGS OF WARM AIR ADVECTION ALREADY AS NOTED BY THE LOW LEVEL

FLOW STARTING TO BACK MN/IA.

WARM AIR ADVECTION BEGINS FOR US TONIGHT WITH 925MB TEMPS PROGGED TO

CLIMB 2-4C BY 12Z MONDAY WITH BACKING LOW LEVEL FLOW LIKELY TO GIVE

ANY LINGERING STRATOCUMULUS SIDESWIPING THE NE CWA THE BOOT OUT OF THE

AREA THIS EVENING. TEMPS TONIGHT ARE A BIT TRICKY AS THERE WILL BE A

WINDOW OF OPPORTUNITY FOR SOME STRONG RADIATIONAL COOLING ONCE WINDS

DECOUPLE LATER THIS EVENING...BUT WITH DEVELOPING WARM AIR ADVECTION

HAVE OPTED TO NOT GET TOO CARRIED AWAY WITH LOWS TONIGHT.

TOMORROW`S HIGH TEMPS ARE TRICKIER THAN ONE WOULD EXPECT WITH MODEL

FORECAST SOUNDINGS SUGGESTING A STRONG LOW LEVEL INVERSION AND

RATHER LIMITED WARMING. WHILE THE SUN MAY BE AT ABOUT ITS LOWEST

ANGLE OF THE YEAR...STILL EXPECTED NEARLY 100% SUNSHINE THROUGH THE

TIME OF MAX HEATING AND WHEN COMBINED WITH STRONG SOUTHWEST WINDS

AND WARM AIR ADVECTION HAVE A STRONG SUSPICION THAT THE LOW/MID 40S

BEING OFFERED UP BY GUIDANCE IS TOO COOL. MONDAY ACTUALLY SEEMS LIKE

A CANDIDATE FOR A 50F DAY...BUT JUST CANT MUSTER UP THE COURAGE TO

GO THAT MUCH ABOVE GUIDANCE SO HAVE SPLIT THE DIFFERENCE WITH

MID/UPPER 40S.

THE MOST CONTENTIOUS PART OF THE FORECAST DEFINITELY COMES IN THE

MONDAY NIGHT INTO TUESDAY MORNING TIME FRAME AS CUT OFF LOW OVER THE

SOUTHWEST MEANDERS EAST NORTHEAST INTO THE OHIO VALLEY AND

EVENTUALLY BEGINS TO INTERACT WITH ITS NORTHERN STREAM COUNTERPART.

MODELS ARE NOTORIOUS FOR HAVING ABSOLUTE FITS TRYING TO RESOLVE

PHASING NORTHERN AND SOUTHERN STREAM WAVES...AND THEY HAVE DONE

THEIR FAIR SHARE OF BOUNCING AROUND WITH THIS SYSTEM THE PAST COUPLE

DAYS. HAVING SAID THAT THE 12Z SUITE OF MODEL GUIDANCE WAS IN PRETTY

GOOD AGREEMENT ON NOT PHASING THESE WAVES UNTIL THEY ARE SAFELY EAST

OF OUR CWA...WHICH WOULD CONFINE MOST OF THE PRECIP TO OUR SOUTHEAST

1/2 TO 1/3 OF THE CWA. P-TYPE WOULD MOST LIKELY BE RAIN

TRANSITIONING TO A WET SNOW BEFORE ENDING WITH ONLY MINOR ACCUMS (IF

ANY) OVER OUR SOUTHEASTERN MOST CWA.

THE CAVEAT TO THIS FORECAST IS THAT THE NORTHERN STREAM SHORTWAVE

WAS STILL OFFSHORE AND NOT FULLY SAMPLED AT 12Z THIS MORNING...SO

PROBABLY BEST TO CHECK IN AGAIN TOMORROW MORNING AFTER IT GETS

SAMPLED AT 00Z. ONCE THESE WAVES PHASE SYSTEM WILL LIKELY BECOME A

HEALTHY SNOW MAKER FOR LOCATIONS JUST EAST OF US.

IN THE WAKE OF TOMORROW NIGHT`S SYSTEM WE TRANSITION INTO A BUMPY

ZONAL FLOW WITH NUMEROUS LOW AMPLITUDE SHORTWAVES TRACKING ACROSS

THE REGION...ONLY SPACED ABOUT 24 HOURS APART WEDNESDAY THROUGH

SUNDAY. ZONAL FLOW THIS TIME OF YEAR TENDS TO BE A MILD PATTERN FOR

US AS ARCTIC AIR REMAINS BOTTLED UP WELL TO OUR NORTH. WHILE WE WILL

SEE ALTERNATING SHOTS OF WARM AND COLD AIR ADVECTION DURING THIS

PERIOD THE DURATION OF EACH WILL BE SO SHORT THAT IT WILL SEEMINGLY

HAVE LITTLE EFFECT ON TEMPS WHICH SHOULD AVERAGE 10F+ ABOVE NORMAL.

IF THE TIMING OF ONE WARM ADVECTION SHOTS ALIGNS ITSELF WELL WITH

SUNSHINE AND DAYTIME THEN WE COULD MAKE ANOTHER RUN AT 50F BEFORE

THE YEAR IS OUT...WITH THURSDAY AND SUNDAY CURRENTLY LOOKING THE

MOST PROMISING DAYS FOR THAT TO OCCUR.

GIVEN THE EXPECTED STORM TRACK AND GENERALLY LOW AMPLITUDE FLOW IF

THERE IS ANY PRECIP DURING THE WED-SUN TIME FRAME IT LOOKS TO BE

LIGHT AND OF THE LIQUID VARIETY. THERE ARE SIGNS OF A PATTERN CHANGE

TO COLDER WEATHER JUST BEYOND DAY 7...BUT THAT`S BEYOND THE SCOPE OF

THIS FORECAST AND DEFINITELY SUBJECT TO CHANGE BETWEEN NOW AND THE

START OF 2012.

IZZI

***************************************************************

The LOT (Chicago WFO) Area Forecast Discussion prepared by Gino Izzi and issued this afternoon ...

The 12z/25 Dec. Euro supports the bolded statement. On the other hand, out toward 240 hours, it would appear from the 500-hPa flow forecast that the arctic air would be on the transient side though a return to the low-amplitude, zonal flow does not appear to be present even then. Alas, it is over a week out, and this represents only something to watch. It is interesting that the GFS ensemble forecast--the poor forecast-to-observed correlations aside--of the NAO and AO does suggest a dip in both indices around or just before the first of the year, with a decidedly downward trend in both toward neutral in the next couple of weeks. On the other hand, we have seen this on a couple of other occasions this winter only to be disappointed upon verification.

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Wow, I've never seen you this optimistic. I suppose it is playing the percentages that we're now due for an active wintry period in the next couple months after this torchy rainy period.

Gut is feeling good and its hardly ever wrong. We have at least 40" coming yet. Works for me.

Not expecting anything remotely, ghd (look east) but, 2 to 4, 4-10" events along with some nickle and dimes will get us there.

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Big D7 storm around here, and the first I've seen all winter with serious cold air to work with. Talk about a weird system, sfc low moves around the IN/MI/OH border for 24hrs.

The 0z is definitely interesting. That would be a good 3-6" snowfall for the area.

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Amazing how different the UKIE/EURO are from the GFS at D7. GFS has an almost zonal flow with minor s/w ripples traversing from W/E. EURO and UKIE want to carve out a huge longwave trough in the east. GEM is kinda in the middle (has a trough, not as amplified).

Edit: looks like the 18z GFS is going to try and dig a trough, although it's slower and further east with it.

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Amazing how different the UKIE/EURO are from the GFS at D7. GFS has an almost zonal flow with minor s/w ripples traversing from W/E. EURO and UKIE want to carve out a huge longwave trough in the east. GEM is kinda in the middle (has a trough, not as amplified).

Edit: looks like the 18z GFS is going to try and dig a trough, although it's slower and further east with it.

At THIS moment in time i am willing to go with the euro. MJO has picked up steam again and most models now bring it to phase 6/7 line. THAT is what is preferred for this region for cold/snow/storminess. Whether the storm actually happens and where remains to be seen ( not everything works out as planned/suposed to ) but we should start seing changes with the pattern that is better for cold/snow/storminess.

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Amazing how different the UKIE/EURO are from the GFS at D7. GFS has an almost zonal flow with minor s/w ripples traversing from W/E. EURO and UKIE want to carve out a huge longwave trough in the east. GEM is kinda in the middle (has a trough, not as amplified).

Edit: looks like the 18z GFS is going to try and dig a trough, although it's slower and further east with it.

At THIS moment in time i am willing to go with the euro. MJO has picked up steam again and most models now bring it to phase 6/7 line. THAT is what is preferred for this region for cold/snow/storminess. Whether the storm actually happens and where remains to be seen ( not everything works out as planned/suposed to ) but we should start seing changes with the pattern that is better for cold/snow/storminess.

GFS op is definitely an outlier for the day 5-7 amplifying CONUS wave. If it verifies as is on the EC it will be one of the best cold shots this winter...even if transient in nature. UK/CMC/EC/ECMENS and even the GFS ensembles suggests a much more amplified wave.

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At one time the Vikings were fishing in parts that are now covered in ice. At one time the great lakes (before the glaciers carved them) was a tropical warm climate. Climate change is part of the history of the planet. Comes and goes....just ask Gore.

Ya, coral is basically our state rock here. People still find sharks teeth occasionally in Michigan too.

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