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Mar. 27-31 Severe Threats


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Yep, they extended the slight up through FWA to TOL and added a 2% tor threat. Now just wait and see what develops.

 

 

Perhaps I'm biased from what happened the other day in a very weakly unstable environment, but I kinda like the tornado chances today. 

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Mid-70s common across the Ohio River vicinity as of 18z. Models were close, if not a touch conservative with temperatures today. (12z NAM was slightly cooler than observed)

I'm setting up near EVV for today's chase. Storms should initiate by 4 p.m. or so based on mesoscale trends and patchy cu field on a SSW to NNE axis from the Missouri bootheel into SE Illinois.

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Looks like the 12z Euro sped up for Thursday, there is basically no instability into the sub-forum this run.

Yea, Thursday looking like a non-event...and Tuesday continues to look like the same out west.

Wednesday continues to show potential, especially on the NAM and ECMWF. Still several issues though.

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mcd0277.gif

 

MESOSCALE DISCUSSION 0277
NWS STORM PREDICTION CENTER NORMAN OK
0223 PM CDT SUN MAR 27 2016

AREAS AFFECTED...SRN/ERN IL...IND...WRN KY AND TN

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 271923Z - 272130Z

PROBABILITY OF WATCH ISSUANCE...60 PERCENT

SUMMARY...SCATTERED STORMS CAPABLE OF LARGE HAIL ARE LIKELY TO
DEVELOP NEAR THE ADVANCING COLD FRONT. LOCALIZED DAMAGING WINDS MAY
ALSO MATERIALIZE LATER IN THE AFTERNOON.

DISCUSSION...LOW-LEVEL MOISTURE IS RAPIDLY ADVANCING NWD ACROSS THE
REGION WITH DEWPOINTS INTO THE MID 50S F AS FAR N AS SWRN OH AND
CNTRL INDIANA. DEWPOINTS FURTHER RISE INTO THE LOWER 60S F FROM WRN
TN INTO NRN MS. THIS IS CONTRIBUTING TO AROUND 1000-1500 J/KG
MLCAPE.

AS TEMPERATURES CONTINUE TO RISE...AND FORCING FOR ASCENT INCREASES
NEAR THE COLD FRONT...THE CAPPING INVERSION JUST BELOW 700 MB WILL
BE BREACHED...ALLOWING SEVERE STORMS INCLUDING A FEW SUPERCELLS TO
FORM. TEMPERATURES ALOFT ARE QUITE COOL WITH 500 MB TEMPERATURES
AROUND -20 C. THIS...COMBINED WITH SUFFICIENT LOW-LEVEL MOISTURE AND
GENERALLY LONG STRAIGHT-LINE HODOGRAPHS WILL FAVOR CELLULAR
ACTIVITY...PERHAPS WITH A FEW SPLITS. LARGE HAIL IS A DISTINCT
THREAT...AND ISOLATED SIGNIFICANT HAIL CANNOT BE RULED OUT. ANY
TORNADO THREAT IS EXPECTED TO BE BRIEF/WEAK GIVEN A DECIDED LACK OF
LOW-LEVEL SHEAR AND WELL-MIXED BOUNDARY LAYER. HOWEVER...A FEW
DAMAGING WIND GUSTS ARE ALSO POSSIBLE.

..JEWELL/THOMPSON.. 03/27/2016


ATTN...WFO...ILN...LMK...IWX...OHX...IND...PAH...LOT...ILX...
MEG...LSX...

LAT...LON 35798746 35818900 36318942 37298936 38878856 40668763
41418653 41698497 41568428 40798407 38938456 36938582
35798746
 
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This afternoon appears to be going to plan. Large hail still sticks out like a sore thumb as the main threat. Damaging winds with time, especially if storms merge and/or once stronger forcing nudges in early this evening.

 

The tornado threat is non-zero, in two main areas, as I see it.

  1. Western Kentucky - Where low level moisture and wind fields are currently the most favorable. Now through late afternoon.
  2. Central to east-central Indiana - Hinges upon moisture return, but may have a narrow window around sunset.
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Thanks for confirming my thoughts Quincy. I have been considering IND and east a mini tornado threat area, good for maybe a spin-up or two. I mentioned to Indystorm (northeast of Indy) earlier that the HRRR was showing a pocket of higher CAPE over his head. Last I checked, dews were running in the mid to upper 50's in Central IN.

 

Good luck down there in the Evansville area.

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Thanks for confirming my thoughts Quincy. I have been considering IND and east a mini tornado threat area, good for maybe a spin-up or two. I mentioned to Indystorm (northeast of Indy) earlier that the HRRR was showing a pocket of higher CAPE over his head. Last I checked, dews were running in the mid to upper 50's in Central IN.

 

Good luck down there in the Evansville area.

Thanks.

Cu field popping in all directions, literally, new towers to the north now. (I'm near the I-64/I-69 interchange) The terrain/road network is much better up here than KY, so I'll probably hang tight until something really captures my attention. 

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I rest my case, latest MD

 

SUMMARY...THE RISK FOR SEVERE STORMS PROBABLY WILL INCREASE FURTHER
ACROSS SOUTHERN/EASTERN INDIANA DURING THE NEXT FEW HOURS.
CONVECTIVE TRENDS IN AREAS NORTH/SOUTH AND EAST OF THE WATCH WILL
CONTINUE TO BE MONITORED FOR THE POSSIBILITY OF INCREASING SEVERE
WEATHER POTENTIAL WHICH COULD REQUIRE A WATCH.

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