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March 2012 General Discussion


Tropical

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Down to 23 here this morning. The last sub freezing temps for the foreseeable future in Northern Indiana.

FWA has had 11 of the past 12 months with positive departures from the normal mean, many months several degrees above normal. The most notable were July and December at +6.4 and +6.0. The exception was September, which was a -1.8. Anecdotally, it seems that we haven't experienced an abnormal number of record highs, but daily minimums have been consistently higher than normal.

It looks like we are going to make it 12 out of 13.

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............

That is absurd. The GEFS are even warmer than the OP GFS,which has a cool Bias. The Euro sends 18-20C 850 mb temps near the Hudson Bay at the end of the run around the 19th.

It looks like most of us will have chances to break records.

Those maps you posted say '850 MB temp anomalies'.

Regardless I would agree record breaking temps are very possible coming up.

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This bares watching for us in Southern parts of Michigan. http://www.spc.noaa.gov/products/outlook/day3otlk.html

If things get more unstable, we may see our first Severe Storms this year.

Interesting.

But yeah, I would like to see more instability/moisture before buying into that.

I never really expect anything to come out of these early season severe weather setups.

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This bares watching for us in Southern parts of Michigan. http://www.spc.noaa.gov/products/outlook/day3otlk.html

If things get more unstable, we may see our first Severe Storms this year.

Just looking at this setup, I'd favor a hail threat slightly over damaging winds especially given low freezing levels.  Although directional shear isn't outstanding, I could see some isolated tornado potential especially if the higher moisture verifies.

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18zNAMFDY.png

18z NAM sounding for Findlay Monday evening. Interesting to say the least.

Low level winds seem to be a little less veered on this run. That will be interesting to watch. I wouldn't think the setup would be particularly favorable for keeping the winds backed given the lack of real deepening, but even if surface winds are more like 190-200 it may still result in about 60 degrees of turning.

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DTX

THE 12Z MODEL SUITE ARE IN OVERALL GOOD AGREEMENT IN SHOWING THE

UPPER LOW LIFTING FROM THE CENTRAL PLAINS TO NRN WISCONSIN/LK

SUPERIOR ON MONDAY...DEVELOPING INTO A MORE OPEN WAVE AS IT PHASES

WITH THE NORTHERN STREAM MONDAY NIGHT. A PLUME OF DEEP MOISTURE OF

GULF ORIGIN WILL LIFT INTO SRN MICHIGAN LATE SUN NIGHT INTO MON

MORNING IN ADVANCE OF THIS WAVE. DECENT SYSTEM RELATIVE MOIST

ISENTROPIC ASCENT WILL LEAD TO A HIGH LIKELIHOOD OF RAIN THROUGH

THIS TIME PERIOD. DEEP SOUTHWESTERLY FLOW SHOULD LEAD TO GOOD

WARMING MON AFTERNOON IN THE WAKE OF THE MORNING RAINFALL. MID LEVEL

HEIGHT FALLS AND COLD AIR ALOFT ASSOCIATED WITH THE MID LEVEL WAVE

WILL STEEPEN LAPSE RATES MON AFTERNOON/EVENING. MODEL SOLUTIONS

/PARTICULARLY THE NAM/ INDICATE THE PASSAGE OF A SFC TROUGH LATE IN

THE DAY WHICH WILL WARRANT A CHANCE OF LATE DAY SHOWERS AND

THUNDERSTORMS. THE NAM DOES NOT WEAKEN THE MID LEVEL WAVE QUITE AS

FAST AS OTHER MODEL SOLUTIONS AND THUS ADVECTS A LITTLE HIGHER SFC

DEWPOINTS INTO SE MI MON AFTERNOON /MID-UPPER 50S/. THIS SCENARIO

WOULD RESULT IN SOME SFC BASED CAPE...WHICH IN LIGHT OF THE STRONG

DEEP LAYER SHEAR AND POTENTIAL LATE DAY MID LEVEL DRYING...COULD

PROVE TO BE A FORMIDABLE SEVERE WEATHER THREAT. PREFER AT THIS TIME

TO HOLD OFF ON MENTIONING A CHANCE FOR SEVERE WEATHER IN THE HWO AS

THE REMAINDER OF THE MODEL SUITE ARE NOT QUITE AS AGRESSIVE WITH

THE LATE DAY SFC MOISTURE ADVECTION AND ARE THEREFORE MORE STABLE

WITH RESPECT TO ANY CONVECTION ROOTED IN THE BOUNDARY LAYER. THIS

WILL CERTAINLY BE SOMETHING TO WATCH THE NEXT COUPLE OF MODEL

CYCLES.

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Interesting.

But yeah, I would like to see more instability/moisture before buying into that.

I never really expect anything to come out of these early season severe weather setups.

I wouldn't say that. If temperatures weren't going to be this warm, I would write it off. But with temperatures approaching 70F, MLCAPE >1,000, veering winds, low level shear, EHI >1, cold 700mb temps, I wouldn't rule out the potential. Everything spells out an isolated tornado event, and widespread hail, and damaging winds threat across SEMI. Solid 30W/30H/5T slight risk for the southern 4.

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