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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Monday
• 
• High: 73 °
• Low: 54 °
• Chance of T-Storms

• Tuesday
• 
• High: 72 °
• Low: 46 °
• Partly Cloudy

• Wednesday
• 
• High: 81 °
• Low: 54 °
• Partly Cloudy

• Thursday
• 
• High: 88 °
• Low: 61 °
• Partly Cloudy

• Friday
• 
• High: 84 °
• Low: 64 °
• Chance of T-Storms

Area forecast discussion 
National Weather Service Grand Rapids Michigan 
300 PM EDT Monday may 21 2012 


Synopsis... 
issued at 258 PM EDT Monday may 21 2012 
skies will clear tonight and fair weather is expected through this 
week as high pressure builds in. There is a chance of showers and 
thunderstorms along a warm front on Saturday. 


&& 


Short term...(this evening through Tuesday night) 
issued at 258 PM EDT Monday may 21 2012 
have the showers departing the eastern forecast area by 00z with 
clearing this evening from west to east as drier air works in. 
Undercut mins overnight a few degrees below guidance based on lows 
upstream in Wisconsin this morning. 


Fair weather to continue under surface ridging through Tuesday night. 
Made no significant changes to grids for those periods. 


Long term...(wednesday through monday) 
issued at 258 PM EDT Monday may 21 2012 
southwest flow will be underway Wednesday as the high over the 
Great Lakes moves east. Wednesday/Thursday look dry. However precipitation chances 
will begin to increase Thursday night as the next cold front is 
forecasted to slowly move eastward. The frontal boundary should be close 
enough by Thursday night to provide a slight chance of thunderstorms and rain. 
Confidence on precipitation Thursday night is low though as it/S seems 
realistic that the frontal boundary will slow it/S eastward progression 
in response to several waves moving northeastward along the 
boundary. A higher chance of precipitation will come Friday as the boundary 
moves across lower Michigan. Friday could actually be rather 
active. Strong flow ahead of the boundary is resulting in model 
convective available potential energy at or above 2k j/kg and Li/S around -6c as the cold front plows into 
it. 


The boundary should sink far enough south Saturday and Sunday to 
result in plenty of sunshine before it heads north Sunday into 
Monday and the convective potential increases. Highs will be mostly 
in the 80s through the period. We went above guidance Sunday and 
Monday as south flow should be well underway again. 


&& 


Aviation...(for the 18z tafs through 18z Tuesday afternoon) 
issued at 128 PM EDT Monday may 21 2012 


Stratus clouds with some areas of MVFR ceilings will persist this 
afternoon but drier air will be moving in from the west and expect 
the clouds to clear by azo and mkg around 19z or 20z and a couple 
hours later across lan and jxn with VFR conditions for tonight. An 
area of light showers will be departing lan and jxn by 21z. 




&& 


Marine... 
issued at 258 PM EDT Monday may 21 2012 
north winds will gust over 20 knots at times this evening but 
waves will remain below four feet. Winds and waves will decrease 
through middle week as high pressure builds in. 


&& 


Hydrology... 
issued at 258 PM EDT Monday may 21 2012 
no rain is expected this week. 


&& 


GRR watches/warnings/advisories... 
Michigan...none. 
Lm...none. 
&& 


$$ 


Synopsis...ostuno 
short term...ostuno 
long term...93 
aviation...ostuno 
hydrology...ostuno 
marine...ostuno