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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Monday
• 
• High: 72 °
• Low: 39 °
• Chance of T-Storms

• Tuesday
• 
• High: 70 °
• Low: 41 °
• Clear

• Wednesday
• 
• High: 77 °
• Low: 52 °
• Clear

• Thursday
• 
• High: 86 °
• Low: 57 °
• Partly Cloudy

• Friday
• 
• High: 86 °
• Low: 50 °
• Partly Cloudy

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


Synopsis... 
issued at 330 am EDT Monday may 21 2012 


A cooler airmass will move in for today and Tuesday with some 
lingering showers today. Highs will only reach the upper 60s to 
lower 70s today and Tuesday before temperatures moderate for 
midweek. After lingering showers today the next chance for rain and 
thunderstorms will not come until very late in the week. 


&& 


Short term...(today through Tuesday afternoon) 
issued at 330 am EDT Monday may 21 2012 


Cooler weather on tap for today behind the cold front with maximum temperatures only 
expected to reach the middle 60s north to low to middle 70s far southeast toward 
jxn. Some showers will linger today before gradually tapering off 
from west to east as suggested by latest sref guidance probability of precipitation. 


Both 00z NAM/GFS guidance quantitative precipitation forecast forecasts suggest very little additional 
rainfall will fall after 12z though... so most of the day should be 
dry after the early morning showers move out. High pressure will 
build 
in from the west for tonight through Tuesday which will bring partly 
cloudy skies and seasonable temperatures. 


Long term...(tuesday night through sunday) 
issued at 330 am EDT Monday may 21 2012 


Cold front will push through the region Thursday night into Friday with some 
thunderstorms. Models are in better agreement on this. Overall the 
threat seems low as the low level jet will be situated north of the 
forecast area.I did increase highs on Friday slightly to account for 
the sharper low level thermal ridge that will be pulling through. 


Then a warm front lifts northward through the region Saturday into 
Sunday. Some uncertainty as to how quickly it lifts through...which 
will impact the moisture pooling and instability. The most recent 
run of the European model (ecmwf) and GFS do lift it north of cad by sun. Will 
mention some scattered storms both Sat and sun for parts of the 
region due to this warm front and elevated instability. Northern 
locations could see storms on sun due to their proximity to the 
front. 


&& 


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 330 am EDT Monday may 21 2012 


Winds behind the cold front today may gust to around or slightly 
over 20 kts at times... but waves will remain below four feet. This 
should just keep it under Small Craft Advisory today with minimal 
wind/wave action tonight and Tuesday as high pressure builds in. 




&& 


Hydrology... 
issued at 330 am EDT Monday may 21 2012 


Quantitative precipitation forecast overnight was not significant enough to have any appreciable 
affect on river levels. The next chance for significant rainfall 
after early this morning will not come until very late this week. 


&& 


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


$$ 


Synopsis...Laurens 
short term...Laurens 
long term...mjs 
aviation...ostuno 
hydrology...Laurens 
marine...Laurens