If updrafts do become more vigorous or organized in southern Michigan, it could result in locally gusty winds with downpours at the surface. CAPE in the hail growth layer looks fairly thin, but upper level shear may support some at least small hail growth despite the thin CAPE, and any hail melt could contribute to downdraft enhancement into a well mixed atmosphere below 5,000 feet. The latest CAMs/HREF members tend to increase convection around I-94 (and/or farther south) during the early/mid afternoon, and this convection may trend toward being surface-based east of Kalamazoo. There may be some mitigation of convection this morning in the I-96 portion of the area as lift will be minimal at that time from upper level dynamics and 850 mb wind speed divergence. MUCAPE around 1000 J/kg and effective updraft-layer shear around 30 knots. A ribbon of moisture streaming in at 800-700 mb. Mid-level lapse rates a fair 6.5 to 7 degrees C/km within a high plains sourced EML plume. (Today through next Thursday) Issued at 342 AM EDT Fri Jul 1 2022Ībove a surface cold front which will slide through the area today will be some support for scattered shower and thunderstorm development this morning into mid afternoon: - Modest upper level divergence over southern Michigan midday associated with a jet streak entrance region. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.Area Discussion for - Grand Rapids, MI (on/off) Help NOTE: mouseover dotted underlined text for definitionĪrea Forecast Discussion National Weather Service Grand Rapids MI 130 PM EDT Fri Jul 1 2022ĭISCUSSION. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. On bright days sunglasses that block both UVA and UVB rays should be worn. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Note: The average daily UV index of 2 in October transform into the following instructions: A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to the Sun's UV rays for the average person. UV indexIn South Haven, the average daily maximum UV index is 2. SunshineThe average sunshine in October is 5.8h. DaylightIn South Haven, the average length of the day is 11h. In South Haven, during the entire year, snow falls for 60.2 days, and aggregates up to 14.45" (367mm) of snow. Throughout October, in the average 0.3 snowfall days, it receives 0.04" (1mm) of snow. October is the first month it typically snows. SnowfallMonths with snowfall in South Haven are January through May, October through December. Rain falls for 16.8 days and accumulates 2.99" (76mm) of precipitation.
RainfallOctober is the month with the most rainfall. HumidityOctober and November, with an average relative humidity of 76%, are the least humid months. In October, the average low-temperature is 48☏ (8.9☌). TemperatureIn October, the average high-temperature decreases, from a pleasant 70.7☏ (21.5☌) in September, to a moderate 58.1☏ (14.5☌). October, the same as September, in South Haven, Michigan, is a moderate autumn month, with average temperature ranging between min 48☏ (8.9☌) and max 58.1☏ (14.5☌).
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