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Spring and Severe weather speculation


SpartyOn

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I would also keep an eye on the ongoing (and in some spots, worsening) drought. Despite MJO progression and typical 2nd-year La Nina climo, between the extreme drought conditions persisting in the Southern Plains (actually, it's worsening in the Desert SW), the warm lake waters and the sheer lack of snowcover and frost ANYWHERE, I highly doubt this Spring and Summer ends up being too cold or inactive severe weather wise.

That's not to say there won't be cold shots or snowstorms (and I'm sure there will be), but I think we can pretty much put the final nail in the coffin for the 2011-2012 winter in terms of sustained winter weather after the end of February/beginning of March.
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I'm gonna sort of go out on a limb and predict that some area of this forum will have a moderate or high risk before March 15.

Based on the recent SPC Day 1, I'm also going to go on a limb and predict that far southern Indiana and far southern Ohio might be upgraded to a low-end moderate risk later today (the recent forecast suggests 10% TOR probablity and 30%/hatched for wind).

http://www.spc.noaa.gov/products/outlook/day1otlk.html

SPC AC 231238

DAY 1 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

0638 AM CST THU FEB 23 2012

VALID 231300Z - 241200Z

...THERE IS A SLGT RISK OF SVR TSTMS OVER MUCH OF THE OH AND TN

VALLEYS...

A BROAD UPPER TROUGH REMAINS OVER MOST OF THE U.S. TODAY...WITH A

VIGOROUS SHORTWAVE TROUGH NOW MOVING INTO THE NORTHERN PLAINS. THIS

FEATURE WILL TRACK EASTWARD ACROSS THE MS VALLEY AND INTO THE GREAT

LAKES REGION BY 24/12Z. GIVEN THE STRONG DYNAMIC FORCING AND WIND

FIELDS WITH THIS SYSTEM...THERE APPEARS TO BE THE POTENTIAL FOR AN

ENHANCED RISK OF SEVERE STORMS TODAY OVER THE OH VALLEY.

...OH VALLEY...

THE MORNING SURFACE ANALYSIS SHOWS A DEVELOPING LOW OVER KS/OK WITH

A WEAK BAROCLINIC ZONE EXTENDING EASTWARD ACROSS NORTHERN AR INTO

THE OH VALLEY. THIS BOUNDARY WILL LIFT SLIGHTLY NORTHWARD TODAY AS

LOW LEVEL WINDS IN THE WARM SECTOR STRENGTHEN AND BACK. AN

INCREASING SOUTHERLY COMPONENT TO THE LOW LEVEL WINDS WILL HELP TO

TRANSPORT 50S DEWPOINTS AS FAR NORTH AS THE OH RIVER THIS AFTERNOON.

MODELS VARY ON THE EXTENT OF CLOUD COVER AND HEATING THAT WILL OCCUR

IN THIS ZONE...BUT OVERNIGHT IR IMAGERY SUGGESTS AT LEAST SOME

BREAKS IN THE CLOUDS ARE LIKELY ACROSS PARTS OF IND/KY/OH. THIS

SHOULD YIELD AFTERNOON MLCAPE VALUES OF UP TO 1000 J/KG. PRESENT

INDICATIONS ARE THAT STORMS WILL INTENSIFY BY MID/LATE AFTERNOON

OVER WESTERN KY/SOUTHERN IND AS THE SURFACE LOW APPROACHES THAT

AREA. MODEL FORECAST SOUNDINGS SHOW RATHER LARGE HODOGRAPHS WITH

3KM SRH VALUES OF 400-500 M2/S2. VERY STRONG SURFACE PRESSURE FALLS

ARE FORECAST JUST AHEAD OF THE SYNOPTIC LOW ALONG THE WARM

FRONT...WHICH MAY LOCALLY AUGMENT VERTICAL SHEAR EVEN MORE.

DISCRETE SUPERCELLS WILL BE POSSIBLE...CAPABLE OF HAIL...DAMAGING

WINDS...AND TORNADOES. STORMS MAY QUICKLY MERGE INTO A FAST-MOVING

MCS WITH A CONTINUED THREAT OF POTENTIALLY SIGNIFICANT DAMAGING

WINDS AND TORNADOES. THIS THREAT WILL LAST UNTIL AFTER DARK AS

STORMS SPREAD INTO WESTERN WV AND SLOWLY WEAKEN DUE TO DIURNAL

COOLING. QUESTIONS REGARDING THE QUALITY OF MOISTURE RETURN AND

DIABATIC HEATING ARE THE MAIN REASONS A MODERATE RISK WAS NOT

INSERTED AT THIS TIME.

...TN VALLEY...

FARTHER SOUTH...WIND FIELDS AND THERMODYNAMICS WILL BE CONDITIONALLY

FAVORABLE FOR SEVERE THUNDERSTORM DEVELOPMENT ACROSS MUCH OF

TN/MS/AL/GA LATER TODAY. HOWEVER...MOST MODEL SOLUTIONS SUGGEST

THAT LOW LEVEL CONVERGENCE AND LIFT WILL BE LACKING ACROSS THIS

REGION AND THAT A SUBTLE CAPPING INVERSION WILL SUPPRESS

DEVELOPMENT. NEVERTHELESS...WILL MAINTAIN THE SLIGHT RISK ACROSS

MUCH OF THIS AREA DUE TO HIGH CONDITIONAL SEVERE RISK IF ANY STORMS

CAN FORM ALONG THE FRONT DURING THE EVENING.

..HART/ROGERS.. 02/23/2012

CLICK TO GET WUUS01 PTSDY1 PRODUCT

NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1630Z

CURRENT UTC TIME: 1358Z (7:58AM), RELOAD THIS PAGE TO UPDATE THE TIME

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