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June 20-21 and June 24-27 Heavy Rain/Severe Threats


Hoosier

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Looking at month to date precip, factoring in the tropical remnants and the pattern afterwards, it's not a stretch that a huge chunk of the area ends up with over 10" of rain this month.  Maybe some area tops 20" if things get crazy.

 

 

post-14-0-26561200-1434649626_thumb.png

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maybe decaying garbage sunday morning

i like from the QC area running back WSW towards northern MO.

progged instability pool and llj nose say hard right turn saturday evening.

I agree on the hard right turn...west of the mississippi is hard for me to buy at the moment...speed/strength of bill playing tricks imo

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A really nice period of seasonally strong mid-level flow setting up quite nicely starting Saturday, and pretty much lasting all week.  Some pretty impressive jet maxes showing up from time to time.  With such a huge pool of instability poised on the periphery of these impulses we should really rack up the severe weather reports this week over a huge part of the MW/Lakes/OV.  

 

This could be one of the most active weeks for widespread severe we get this summer.

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A really nice period of seasonally strong mid-level flow setting up quite nicely starting Saturday, and pretty much lasting all week.  Some pretty impressive jet maxes showing up from time to time.  With such a huge pool of instability poised on the periphery of these impulses we should really rack up the severe weather reports this week over a huge part of the MW/Lakes/OV.  

 

This could be one of the most active weeks for widespread severe we get this summer.

 

I'd have to think at least one of these days will end up being a bigger event given the mid level flow alone. Those kinds of winds aloft can drive strong MCSs/derechos. Maybe some chances for tornadic setups too especially in regions with more backing in the low levels since there almost certainly will be good speed shear.

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I'd have to think at least one of these days will end up being a bigger event given the mid level flow alone. Those kinds of winds aloft can drive strong MCSs/derechos. Maybe some chances for tornadic setups too especially in regions with more backing in the low levels since there almost certainly will be good speed shear.

 

Yeah with some leftover boundaries around on a daily basis there could even be a few surprises in store.  Probably be a few MCVs roaming through the region as well, which can always enhance tor potential.

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New day 3 has a slight risk basically along the I-70 corridor in IL/IN/OH. Disco makes me think an upgrade to at least enhanced could eventually happen.

 

 

 

DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0212 AM CDT FRI JUN 19 2015

VALID 211200Z - 221200Z

...THERE IS A SLGT RISK OF SVR TSTMS ACROSS PARTS OF THE MID MS
VALLEY AND NRN OH VALLEY...



...MID MS AND OH VALLEYS...
A LONG STRETCH OF WEST TO NORTHWEST MID-LEVEL FLOW IS FORECAST ON
SUNDAY ACROSS MUCH OF THE NRN CONUS. AN UPPER-LEVEL TROUGH IS
FORECAST TO MOVE INTO THE NRN PLAINS AS A BELT OF STRONG MID-LEVEL
FLOW SPREADS EWD ACROSS THE NCNTRL STATES. AT THE SFC...A
QUASI-STATIONARY FRONT IS FORECAST TO BE IN PLACE FROM THE CNTRL
PLAINS EWD INTO NRN PARTS OF THE OH VALLEY...ALONG WHICH
THUNDERSTORM DEVELOPMENT WILL BE POSSIBLE SUNDAY AFTERNOON. DUE TO
THE MID-LEVEL FLOW WHICH IS FORECAST TO BE PARALLEL TO AN ELONGATED
EAST TO WEST FETCH OF STRONG INSTABILITY...A DAMAGING WIND EVENT CAN
NOT BE RULED OUT ACROSS THE MID MS VALLEY AND NRN OH VALLEY SUNDAY
AFTERNOON.
NAM FORECAST SOUNDING FOR 21Z/SUNDAY FROM CNTRL IL EWD
INTO SRN OH SHOW SFC DEWPOINTS IN THE LOWER 70S F...MLCAPE VALUES OF
3000 TO 4500 J/KG WITH 30 TO 40 KT OF 0-6 KM SHEAR. THIS WOULD BE
FAVORABLE FOR SEVERE STORMS ESPECIALLY IF A FORWARD PROPAGATING
BOWING LINE SEGMENT CAN DEVELOP LATE SUNDAY AFTERNOON. AT THIS
POINT...THE MAGNITUDE OF THE SEVERE THREAT REMAINS UNCERTAIN AND
COULD BE DRIVEN BY MESOSCALE FACTORS. THE THREAT OF A SEVERE MCS
APPEARS GREAT ENOUGH TO WARRANT THE ADDITION OF A SLIGHT RISK AREA
EXTENDING EAST TO WEST ACROSS THE OH VALLEY STATES.

 
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No outlined areas on the new 4-8 day but sounds very promising.

 

 

 

DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0334 AM CDT FRI JUN 19 2015

VALID 221200Z - 271200Z

...DISCUSSION...
THE MEDIUM RANGE MODELS BEGIN THE DAY 4 TO 8 DAY PERIOD WITH A
SHORTWAVE TROUGH OVER THE UPPER MS VALLEY AND MOVE THIS FEATURE
ESEWD ACROSS THE GREAT LAKES REGION ON MONDAY/DAY 4. BOTH THE ECMWF
AND GFS HAVE AN AXIS OF STRONG INSTABILITY FROM THE CNTRL PLAINS EWD
INTO THE OH VALLEY FOR MONDAY AND TUESDAY/DAY 5. A SEVERE THREAT
WILL BE POSSIBLE ON MONDAY AFTERNOON AND TUESDAY AFTERNOON ALONG THE
INSTABILITY GRADIENT FROM IA ESEWD ACROSS NRN PARTS OF THE OH
VALLEY. AN ENHANCED WIND DAMAGE THREAT WILL BE POSSIBLE ON EITHER
ONE OF THESE DAYS BUT SPATIAL UNCERTAINTY REMAINS TOO GREAT TO
WARRANT THE ISSUANCE OF AN OUTLOOK AREA.
ON WEDNESDAY/DAY 6...MODEL
SOLUTIONS DIVERGE WITH THE ECMWF MOVING A SHORTWAVE TROUGH INTO THE
NRN PLAINS WHILE THE GFS HAS A SHORTWAVE RIDGE OVER THE UPPER MS
VALLEY. BOTH SOLUTIONS STILL SHOW STRONG INSTABILITY IN THE OH
VALLEY SUGGESTING A SEVERE THREAT WILL BE POSSIBLE THERE WEDNESDAY
AFTERNOON. ON THURSDAY/DAY 7...THE ECMWF MOVES A SHORTWAVE TROUGH
THROUGH THE GREAT LAKES REGION AND SAGS A FRONTAL BOUNDARY SWD IN
THE CNTRL APPALACHIAN MTNS. THIS WOULD MAKE STRONG TO SEVERE
THUNDERSTORM DEVELOPMENT POSSIBLE NEAR THE FRONT IN THE MID-ATLANTIC
REGION THURSDAY AFTERNOON. THE GFS IS MUCH SLOWER WITH THE SHORTWAVE
TROUGH ON THURSDAY INTRODUCING MUCH UNCERTAINTY. THIS LACK OF
PREDICTABILITY CONTINUES THROUGH LATE IN THE WEEK.

..BROYLES.. 06/19/2015
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