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February 20-21 Heavy Rain/Flooding/High Wind Threat


Hoosier

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50s back here to west. 50s in February aren't so much of a torch compared to late December. Should say that's a great example of what the EURO was showing.

I was just going by ORD (61F) and DTW (62F) on 12-27-08. And while its true temps avg about 5F higher in late Feb than Dec, not to mention sun angle....frozen ground is more of a concern in Feb, so if anything, flooding could be worse.

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That might be a decent comparison but can't remember what the ice jams were like back then. 

 

This is almost a worst case scenario if we get rounds of heavy rain.  Then after that it looks like we go back into a colder pattern...frozen floodwaters? 

Grand Rapids AFD made a brief mention of something along those lines happening with respect to heavy rain to cold:

 

 

850MB TEMPS ARE STILL PROGD TO REACH +8C WHICH WILL RESULT IN 40S

TEMPS WITH FOG AND WIDESPREAD RAIN. THE WARMER AIR WILL SURGE IN

WEDNESDAY NIGHT AS SNOW CHANGES OVER TO RAIN. ALL RAIN ON THURSDAY

WITH DENSE FOG LIKELY AS THE WARM AIR RIDES OVER A MELTING SNOW

PACK. THE COLD AIR SWEEPS IN QUICKLY BEHIND THE LOW THURSDAY EVENING

WHICH WILL HALT THE SNOW MELT. WHAT THIS WILL DO THOUGH IS SET THE

STAGE FOR POTENTIALLY BIGGER HYDRO ISSUES DOWN THE ROAD AS THE

MOISTURE WILL GO UP IN THE SNOW PACK. THE SNOW WILL ABSORB QUITE A

BIT OF THE RAINFALL WITH SNOW WATER EQUIVALENTS RISING.

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Even if the snow pack did absorb most of the rain, there would be a lot of street flooding. Likely basement flooding as well.

Actually you bring up a good point about street flooding, I know several side streets in my neighborhood that are completely snow covered still and it is a frozen snow pack at that. The storm drains are blocked off on these streets as well. If the GFS is right, it will be a complete disaster out on these streets. Even worse would be if we quickly drop in temperature right after the heavy rain.

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