April snow and sleet with new cold surge; Freeze Warning Saturday morning

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Freeze warning from am until 11 am Saturday

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Data pix.

APRIL RAIN, SLEET AND SNOW SHOWERS

More rain, sleet and snow showers move about central Indiana Friday late afternoon.  From sunshine to heavy downpours of sleet and mixed snow.  Strange weather for spring but not uncommon.  April sun vs. unseasonably cold air are the ingredients for such odd weather.

WHY IS IT SLEETING?

The sun angle is higher and sun strength is stronger but the chilly air at the surface sets the table for unstable air.  The 'heating' of the sun by late morning will cause the air to rise, making contact with the low level cold allowing clouds to build.  First as puffy cumulus clouds then as heating increases into the noon hour, these clouds continue to build then produce precipitation.  Snowflakes start to fall then melt to rain drops only to freeze again before reaching the ground.  Sleet, falling at times rather vigorously and at time a few snow flakes make it down to early as well.

WET SNOW SHOWERS TONIGHT

later tonight, after the sun sets, colder air and a passing cold front will allow a wet snow and occasional snow showers at times.  These may produce big, wet snowflakes at times and briefly accumulate.  The snow showers will taper and diminish after 3 - 4 am.  Travelling late you could run into reduced visibility and brief slick spots.

Wet, snow showers are likely later Friday night
Wet, snow showers are likely later Friday night

HARD FREEZE THIS WEEKEND

Temperatures remain cold for Saturday and may struggle to reach the 40° mark.  A few flurries are possible early, then clouds will build and a few isolate rain/snow/sleet showers could develop.  More stable air returns Saturday night and clearing will commence around sunset.

Temperature lows will likely reach hard freeze levels both Saturday and Sunday morning - meaning low temperatures into the middle to upper 20s.  A freeze warning is in effect for Saturday and Sunday morning.

Freeze warning from am until 11 am Saturday
Freeze warning from am until 11 am Saturday

WINDY WARM UP TO END THE WEEKEND

Strong winds will blow Sunday afternoon and temperature will be on the rise.   Rain showers are yto develop by evening but plenty of dry time should allow area temperature to jump inti the upper 50s to near 60° by evening.

Windy, and warmer Sunday after a hard freeze
Windy, and warmer Sunday after a hard freeze

PATTERN CHANGE

This could be one of, if not the last very chilly surge of the season.  We certainly can't write off another night around freezing - the average date of the last freeze is April 16th but the latest date is may 27th 1961!  At least longer range there is improvements.  I'm posting the upper air patter for next Friday.  The current thinking is that we will have cool mornings and warmer days reaching the middle to upper 60s by Friday afternoon.

pattern chancge next week will bring sunny and warmer weather for extended spell
pattern change next week will bring sunny and warmer weather for extended spell

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