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Apr
21

Wind Advisory In Effect Until 8pm

Posted By · April 21, 2015 at 11:17 am

A Wind Advisory continues until 8pm for areas along and north of the I-70 corridor.  Within this zone expect wind gusts to be persistently in the 30-40mph range, with peak gusts approaching 50mph at times.  Use caution if traveling around high profile vehicles and it’s a good to secure any loose lawn furniture.

WIND ADVISORY RADAR

The windy day is courtesy of several factors coming together across the Great Lakes and Ohio Valley.  A tight pressure gradient around a low pressure system over the Great Lakes creates a strong wind field at all levels of the atmosphere, and sunshine plus cold air aloft allow substantial atmospheric mixing of this wind to be distributed to the surface.

RPM 4PM TODAY HIGHS TODAY PLANNER TODAY

Wind today comes briskly from the southwest at 25-35mph with higher gusts.  Late this evening a few showers or storms may develop in southern Indiana, but most locations remain dry until tonight.  The arrival of another cold front triggers widespread showers and occasional rumbles of thunder between 12am and 7am tomorrow.  The passage of this cold front reinforces the already cooler than normal pattern.

RPM 8PM TODAY RPM 8AM WEDNESDYA LOWS TONIGHT PLANNER TONIGHT PLANNER TOMORROW

Once again tonight a steady breeze keeps the areas safe from frost, but lows return to the upper 30s and lower 40s.  Highs Wednesday struggle into the lower 50s with breezy conditions continuing as the low pressure system spins slowly eastward.

We continue to target Thursday and Friday mornings for frost/freeze potential as the wind calms and the sky remains mainly clear.  Lows in the 32-36 degree range seem likely and may require action to protect tender/young vegetation.

HIGHS TOMORROW LOWS THURSDAY MORNING 7DAY

All signs continue to point toward a wet, and rather raw Saturday with rain overspreading Central Indiana and highs in the upper 40s and lower 50s.  Sunday looks to be the better day of the weekend thus far.  Check back for updates on timing and coverage of precipitation for weekend impacts – Sean Ash

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Apr
21

Wind Advisory Today

Posted By · April 21, 2015 at 3:23 am

Hang on to your hat! A Wind Advisory goes into effect at 11 amd and lasts until 8 pm for most of the WTHR viewing area. Don’t be shocked if the wind speeds gust from 40-50 miles per hour. The wind will kick the high temperatures into the low 60s later today and it will be mainly dry.windadvisoryDaypart

Steady wind will keep us from seeing a frost today and Wednesday mornings.  We could see that chance increase Thursday and Friday mornings as the wind eases and we’ll see quicker cooling.  Either way lows will chill into the low to mid 30s.  A sunny finish to the week gives way to clouds and showers heading into Saturday. There is a chance for rain for the Indy eleven game Saturday night at this point though we’ll watch for any changes in the forecast.

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THIS DAY IN INDIANA WEATHER HISTORY

In 1893, rain fell for the 13th considerable day, establishing a record.

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Apr
20

Wind Advisory Tuesday & Frost Possible Later This Week

Posted By · April 20, 2015 at 5:03 pm

Peak wind gusts across Central Indiana today were in the 35-40mph range.  The wind remains steady this evening and will be brisk overnight into Tuesday morning… saving the region from frost development.

WIND GUSTS WIND ADVISORY WIND GUSTS RPM

Daytime heating, albeit minimal, helps mix down stronger wind at 5,000 feet aloft within the pressure gradient to the surface.  This wind field is a result of the thight pressure gradient around a low pressure system in the Great Lakes.

Expect wind gusts Tuesday in the 40-50mph range within and around the Wind Advisory area that’s in effect from 11am to 8pm Tuesday.

UPPER LEVEL PATTERN

Higher pressure builds in across the Ohio Valley later in the week and aids in frost potential Thursday and Friday morning.  This is when wind will be much calmer, and under a clear sky leads to greater raditional cooling.  With lows expected to be in the low to mid 30s… I expect Frost Advisories to be issued later this week over parts, if not all, of the viewing area.

THURSDAY FRIDAY FROST FACTS

The average last 32 degree temperature in Indianapolis is April 18th and the average last 36 degree temperature (when patchy frost can occur) is April 25th.  You’ll likely need to take precautions to protect any tender vegetation that’s blooming.  Check back for updates.

7DAY

Spotty showers are possible Tuesday afternoon into early Wednesday.  Medium to long range guidance suggests Saturday will be rather wet and raw with highs struggling to hit 50 degrees.  Global teleconnections also point toward this spell of unseasonably cool weather to linger for the rest of the month and possibly into early May – Sean Ash

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Apr
20

Monday Marks Prolonged Spell Of Below Normal Temperatures

Posted By · April 20, 2015 at 1:18 pm

In the wake of a cold front that passed through the Indy metro area around 9am this morning… gusty wind and below normal temperatures are the big story this afternoon.  Temperatures range from 45 to 55 degrees for late day highs.

TEMPS TEMPS OHV FRONT

The aforementioned front is now pushing across Ohio and attached to an area of low pressure over the Great Lakes.  This low will be the driver of our weather for several days and becomes cut-off from the main jet stream.  This allows it to spin around the Great Lakes day after day and reinforce already cooler than normal conditions.

LOW PRESSURE RPM 5PM TODAY RPM 9PM TODAY

This is the first day of an unseasonably cool stretch of days with temperature anomalies 10-15 degrees below normal.

Spotty showers pop up during peak heating this afternoon as the atmosphere destabilizes.  Clouds and showers diminish after sunset, but the brisk wind remains a constant heading into Tuesday morning.

PLANNER EVENING PLANNER TONIGHT

Despite clearing and lows dropping into the upper 30s and lower 40s… the steady breeze keeps frost from morning tonight.  Expect brisk conditions to linger into Wednesday morning as the pressure gradient around the Great Lakes Low keeps the wind in the 10mph+ range for the next 48 hours.

LOWS TONIGHT

Morning sunshine tomorrow gives way to a building cloud deck and more showers in the afternoon.  Highs near 60 degrees Tuesday but a strong wind of 25-35mph makes it feel cooler.

RPM 7AM TUESDAY RPM 4PM TUESDAY PLANNER TUESDAY

Steady wind saves the region from frost Tuesday and Wednesday mornings.  But we’ll need to monitor Thursday and Friday mornings for frost potential and the wind eases and we’ll see greater raditional cooling.  Either way lows will chill into the low to mid 30s.  A bright finish to the week gives way to clouds and showers heading into Saturday.

RPM 5PM WEDNESDAY RPM 7AM THURSDAY JET STREAM 7DAY

All signs point to a much colder than normal finish to the month of April and perhaps beginning of May.  Stay tuned for updates – Sean Ash

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Apr
20

Big Pattern Change

Posted By · April 20, 2015 at 3:21 am

A little bit of everything the next few days. We have seen temperatures drop, a few showers and windy conditions this morning. In fact, the pattern we’ll see this week will be the coolest outbreak of weather since March. Temperatures should be locked in the 50s today and likely what highs will be much of the week.

Daypart

The main forecast headline this week will be cooler than temperatures with several days of highs in the 50s and lows in the 30s.  A couple of mornings patchy frost will be possible and fine-tune this part of the forecast in the days ahead.  We aren’t looking for any severe weather organized precipitation seems unlikely, but spotty showers will be possible Wednesday into Saturday.

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ON THIS DAY IN CENTRAL INDIANA WEATHER HISTORY…

Tornadoes touch down in Elwood, Jamestown and Kokomo on this date in 2004.

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Apr
19

More Downpours Next Few Hours

Posted By · April 19, 2015 at 8:54 pm

Another round of downpours pivoting around an area of low pressure will move across Central Indiana between now and midnight.  No severe weather expected, but a rumble of thunder or locally gusty wind remain possible.

RAINFALL RADAR RPM 10PM TONIGHT

After midnight rain become fairly scarce but showers remain possible heading into the Monday morning commute.  While I don’t envision a wash-out tomorrow like today, showers or a rumble of thunder are possible from sunrise to sunset.

RPM 7AM MONDAY PLANNER TOMORROW

If you have outdoor these showers will be widely scattered and quick-movers.  So a washout seems unlikely, but a delay(s) are possible given the 50% coverage that’s anticipated.

RPM 12PM MONDAY

RPM 5PM MONDAY

The rest of the week features cooler than normal conditions with highs in the 50s and several mornings in the 30s.  We’ll need to closely monitor nights that will have a clear sky and light wind for frost potential.  Updates to come – Sean Ash

7DAY

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Apr
19

Update On Soggy Sunday

Posted By · April 19, 2015 at 4:39 pm

The steady, heavy at times, rain shield continues to lift north-northeastward into north central Indiana.  By 6pm the heaviest downpours should be north of I-70.  Impressive rainfall amounts in the half inch to inch plus keep street flooding in play.

WEATHERBUG TEMPS 24hr temp change

Clouds and rain delivered a much cooler finish to the weekend… and a good 15 to 20 degrees less than the mid/upper 70s from Saturday.

PLANNER TONIGHT HRRR 9PM TODAY

We’ll also need to monitor southern and southeastern Indiana for isolated storms this evening where some destabilization may aid in locally strong/severe storms.  It’s not likely, but rather a low probability (<5% chance within 25 miles of a point) of locally severe wind or a quick tornado spin-up in stronger cells.

HRRR 11PM TODAY HRRR 5AM MONDAY

Scattered showers and storms remain possible overnight into Monday afternoon before precipitation chances diminish by mid-week.  Low pressure strengthening over Central Indiana will create gusty wind late evening and overnight… when wind speeds may approach 30mph.  The main forecast headline this week will be cooler than temperatures with several days of highs in the 50s and lows in the 30s.

PLANNER MONDAY RPM 7AM MONDAY RPM MONDAY 2PM RPM MONDAY 7PM

After the sunset tomorrow the instability clouds/showers (driven by much colder air aloft) diminish and set up a chilly night in the 30s.  This will be the first of several colder than normal nights this week.  A couple of mornings patchy frost will be possible and fine-tune this part of the forecast in the days ahead.  At this point organized precipitation seems unlikely, but spotty showers will be possible Wednesday into Saturday.

RPM TUESDAY 7AM RPM 7PM TUESDAY JET STREAM 7DAY

More updates to come this evening – Sean Ash

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Apr
19

Showers Take Over

Posted By · April 19, 2015 at 12:39 pm

Widespread rain has moved into central Indiana this afternoon.

radar

Some heavy rainfall is moving northwest, with some areas already picking up over a half inch of rain today.

bug sites

Showers and a few isolated thunderstorms will continue through the evening.  The heavier rain will taper off later this evening.

sunday 6pm sunday 1pm sunday 3pm

More showers are likely on Monday.

Much cooler air arrives mid week.

7day

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