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June 9-11 Severe/Heavy Rain Threats


Hoosier

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There will likely be a sharp cut-off to the

precip along the western/southwestern flank of this band, with

much of our CWA probably remaining dry tonight. In fact, not out

of the question that the band of convection could set up just to

our NE and keep most, if not all, of the CWA dry tonight. For this

reason, have sharpened up the POP gradient and kept the highest

pops at the lower end of the likely range.

 

as far as Fri and Sat, overdone dews, weak forcing, etc

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as far as Fri and Sat, overdone dews, weak forcing, etc

^ thanks Alek

 

I see SPC still has SW Ontario (where I am located) and points SE into OH and PA in the slight risk for D3. I've been following this forecast and I'm getting wary that this potential MCS may be a bust for SW Ontario. Typical considering the model signals were somewhat consistent for most of the week. SMH...

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AREA FORECAST DISCUSSION  

NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE, IL  

1139 AM CDT THU JUN 9 2016  

   

UPDATE  

 

1122 AM CDT  

 

THUNDERSTORM TRENDS HAVE EVOLVED SOMEWHAT AS EXPECTED THIS  

MORNING BUT SHOWERS HAVE BEEN MORE PERSISTENT THAN ANTICIPATED.  

THE TWO MOST LIKELY SCENARIOS WERE FOR THE MORNING ACTIVITY TO  

DISSIPATE AND FOR REDEVELOPMENT TO OCCUR TOWARD LATE AFTERNOON OR  

EVENING, OR FOR THE MORNING ACTIVITY TO PERSIST INTO MID DAY AND  

EARLY AFTERNOON AND INHIBIT OR DELAY LATER REDEVELOPMENT. THE  

LATTER SCENARIO SEEMS TO BE PLAYING OUT. STILL THINK TRENDS WILL  

FAVOR DISSIPATION OF EXISTING ACTIVITY AS CLOUD TOPS CONTINUE TO  

WARM AND THE LOW LEVEL JET FEEDING INTO NORTHWEST ILLINOIS  

CONTINUES TO WEAKEN, BUT HAVE MAINTAINED CHANCE OF TSRA THROUGH  

THE AFTERNOON FOR MOST OF THE AREA AND HAVE LOWERED HIGHS A COUPLE  

OF DEGREES ESPECIALLY IN AREAS WITH THE MOST RAINFALL AND CLOUD  

COVER SO FAR THIS MORNING. A WARM FRONT RUNNING FROM SOUTHEAST IA  

THROUGH CENTRAL IL WILL CONTINUE TO LIFT NORTH THROUGH THE AREA  

TODAY, BRINGING A NEW AIRMASS WITH TEMPERATURES IN THE LOW TO MID  

80S. THIS IS THE REASON FOR NOT BUMPING TEMPERATURES DOWN MORE  

THAN JUST A COUPLE OF DEGREES, AT LEAST FOR NOW. IT IS POSSIBLE  

ONLY THE SOUTHWEST PORTION OF THE FORECAST AREA WILL SEE A  

SIGNIFICANT RISE IN TEMPERATURES WITH THIS FRONT DURING THE  

AFTERNOON, SO THE FORECAST COULD BE TOO COOL FOR THOSE LOCATIONS  

AND TOO WARM FARTHER NORTH.  

 

LENNING  

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Convection in SW Wisconsin continues along the nose of the low-level jet, which is still forecast to slowly progress eastward and focus over south-central and southeast WI and northeast IL this evening. It's not a matter of if there is training, in my opinion, just where. PWATs are already higher than in the axis of precip over MN and IA last night, where some 2-4" amounts occurred. Should see PWAT peak near 1.75" this evening per global guidance, which has a good handle on them now. 

 

Lack of sun and heating is irrelevant for strongly forced, elevated events like these.

 

The HRRR has not performed well with this event so far, imo. 

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Favorable wind shear near the warm front already, but as mentioned, it seems conditional/questionable at best that any storms can fire there. The HRRR and HOPWRF ENS show only weak, short-lived convection to the west of ongoing shower/t-shower activity. 

post-533-0-66337500-1465500677_thumb.jpe

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