Category: Forecast Models

September: Where We’ve Been And Where We’re Going…

Month-to-date, September has been a warm (+3.5 degrees) and wet (+1.17″) month across central Indiana.

month-tdevmonth-ppercThe warmth continues in the days ahead, but we’re going to run much drier, overall, as strong ridging remains the dominant factor through late week.

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cfs_tprecip_anom_conus_2016092000_21The past (90) days have featured hefty rains across the Mid West.

nws_precip_conus2_90Late season heat will grip most of the east over the upcoming (7) days. Note those population areas (nearly 90% of the lower 48) to experience at, or above, 80 degree heat between now and next Tuesday. Even areas into the Lakes and New England get in on the late summer feel.

ndfd_pop_over_80_8In the shorter term, an isolated shower is possible this evening, but most should remain dry as the air is very dry across the region.

hires_ref_indy_16The upper air pattern features strong ridging over the central and east over the upcoming several days. A cold front and associated trough will deliver cooler air by the early to middle part of next week.

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4In between the warmth and pending cooler, more fall-like, air will be a round of scattered showers and thunderstorms early next week. Modeling differs on precipitation amounts, but, as of now, heavy rains aren’t looking likely.

gefs_qpf_ens_ky_33As mentioned, early to middle parts of next week should feature temperatures much closer to where we should be this time of year, if not a few degrees below average.

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VIDEO: Weekend Weather And Late Month Talk…

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VIDEO: Two Cold Fronts This Week And Late Sept. Talk…

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Tracking Two Fronts This Week…

It’s a quiet and cool start to the work week across central Indiana.  In fact, a couple upper 40s are showing up on the morning station plots.  It’s getting to be that time of the year…  (Feel free to click on the image to enlarge).

screen-shot-2016-09-12-at-7-35-53-amTemperatures are running slightly below average, locally, with cooler anomalies across the Northeast.

screen-shot-2016-09-12-at-7-37-20-amHigh pressure will remain entrenched over our region today and supply dry conditions and pleasant humidity levels.

gfs_mslp_pcpn_frzn_us_1Our next storm system will push in Wednesday and as the cold front sags south through the state, it will spark scattered showers and possibly a thunderstorm.

gfs_mslp_pcpn_frzn_us_10Reinforcing cool air will move in behind the front for a couple days.  Lows in the lower-middle 50s with highs in the upper 70s.

3As we flip the page to the weekend, it still looks rather damp Saturday as another boundary moves in.  This will have more moisture to work with when compared to Wednesday and rain coverage will be more widespread.  As a whole, (7) day rainfall totals should be in the 0.50″-1.00″ range for most.

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Periods Of Heavy Rain Then Much Cooler…

A “wavy” frontal boundary will be located over our region through the next 36-48 hours before getting a “shove” south from a cold front Saturday. 


The combination of the stationary front along with a tropical-rich air mass in place will be enough in and of itself to produce periods of heavy rain today into Saturday morning. Add in a couple of disturbances moving along the boundary and the heavy rain prospects grow even higher. A strong to severe storm also can’t be ruled out-primarily this afternoon and again Friday afternoon. 

Already this morning (6:30a) we note widespread showers and embedded thunder impacting IL and northern IN. 


As mentioned, the air mass is plenty “juicy” to fuel locally heavy rain through the period. Precipitable water values (PWATs) will surge north of 2″ for all of central IN later today. 


While it won’t rain the entire time, periods of heavy rain will remain in our forecast today through Saturday morning. Widespread 1″-2″ totals will be common, with locally heavier totals. 


High pressure will build overhead Sunday and lead to quite the change. A much cooler and drier air mass will return along with brighter skies to wrap up the weekend. 


Lows in the middle 50s will be common for the city, itself, Sunday through Tuesday mornings. Upper 40s to lower 50s are a good bet away from the metro. 

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