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June 9-11 Severe/Heavy Rain Threats


Hoosier

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Tomorrow afternoon/evening has some potential in Southern Ontario as andyhb mentioned.

 

Looks like a very sticky airmass will be in place, dews in the 70-72 range. 12Z NAM hitting hard with supercell composites yet little forcing for storms. Thinking lake breezes will be the trigger (if any) so this could help keep things isolated. Bulk shear in the 45-50kt range looks nice too.

 

The NAM being the NAM is probably a bit overdone.. showing upwards of 4000 J/kg SBCAPE. Still, even cutting that in half should give us a shot at some severe weather, MAYBE even a tornado or two.

 

Going to need some more model support before I'm fully sold on anything, and with lake breezes you usually need to wait until the short-range models come into play day-of.

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Just saw this from an hour ago:

MESOSCALE DISCUSSION 0862

NWS STORM PREDICTION CENTER NORMAN OK

1202 PM CDT FRI JUN 10 2016

AREAS AFFECTED...SRN AND ERN MN...NW WI...NRN IA

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 101702Z - 101830Z

PROBABILITY OF WATCH ISSUANCE...80 PERCENT

SUMMARY...A POTENTIAL FOR WIND DAMAGE AND ISOLATED LARGE HAIL WILL

LIKELY DEVELOP ACROSS PARTS OF THE UPPER MS VALLEY EARLY THIS

AFTERNOON. WW ISSUANCE WILL PROBABLY BE NEEDED ACROSS THE REGION.

DISCUSSION...LATEST SFC ANALYSIS SHOWS A COLD FRONT OVER WRN MN

EXTENDING SWWD INTO NE SD WITH A 1005 MB LOW OVER SCNTRL MN. A WARM

FRONT EXTENDS EWD FROM THE SFC LOW INTO WRN WI WITH SFC WINDS

LOCALLY BACKED TO THE SOUTH SOUTHEAST JUST TO THE NORTH OF THE

FRONT. A MOIST AIRMASS IS IN PLACE AHEAD OF THE COLD FRONT WITH SFC

DEWPOINTS GENERALLY IN THE UPPER 60S TO LOWER 70S F. ACCORDING TO

MESOSCALE ANALYSIS...A POCKET OF MODERATE INSTABILITY IS LOCATED

FROM NEAR THE SFC LOW IN SCNTRL MN EXTENDING SEWD INTO WRN WI. A

COUPLE OF LINES OF THUNDERSTORMS ARE ONGOING AHEAD OF THE FRONT IN

CNTRL AND NE MN. THE WRF-HRRR SUGGEST THIS ACTIVITY WILL GRADUALLY

INTENSIFY AND MOVE EWD ACROSS ERN MN INTO NW WI THIS AFTERNOON.

REGIONAL WSR-88D VWPS ALONG THIS CORRIDOR SHOW WIND PROFILES WITH

STRONG VEERING WITH HEIGHT IN THE LOW-LEVELS AND 40 TO 50 KT OF FLOW

ABOVE 3 KM. THIS SHOULD SUPPORT A SEVERE THREAT AS A LINEAR

CONVECTIVE SYSTEM INTENSIFIES THIS AFTERNOON. WIND DAMAGE WILL BE

MOST LIKELY WITH BOWING SEGMENTS ALONG THE LINE. HAIL WILL ALSO BE

POSSIBLE WITH THE STRONGER CORES EMBEDDED IN THE LINE.

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with the pressure pattern weakening as the front nears late tomorrow afternoon, it seems possible a lake breeze could ignite thunderstorms over the chicago metro that have the potential to interact with frontal convection. greatest threat is probably localized flooding. looks fairly garden variety unless shear is better than forecast.

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The southern part of the line seems to be weakening, while the northern part is peaking. 

 

For people with high hopes for tomorrow, hope this thing dies quickly. 

I don't really have high hopes for tomorrow. Gut feeling says these fire right over me and miss out to the south. It seems to be a common occurrence in these parts. We blow up storms and hand them off to Canada or Ohio.

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Same. Expected them to move more ESE/SE, but they seem to have taken a turn and are moving SSE. Maybe we'll get some rain after all.

 

It's not going to be too strong when it gets here, but some rain nonetheless. Down into the 60s under the stratiform rain.

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