Humidity relief on the way 

Posted: 8:32 am Wednesday, August 22nd, 2018

By Kirk Mellish

It is rare to get a cold front to pass all the way to the Gulf of Mexico this time of year, they are usually blocked by high pressure with the jet stream up near Canada and a tropical air mass blanketing the Southern States.

But this year thanks to upper level troughs that keep coming into the east off the big heat ridge out west it keeps happening periodically.

So it is again bringing us relief from humidity next few days.

300mb JET STREAM FLOW TODAY:

ruc00hr_300_wnd

500MB JET STREAM PATTERN TODAY:

ruc00hr_500_tmp

SURFACE WEATHER MAP LATE TODAY:

prog12hr

SURFACE WEATHER MAP LATE TOMORROW:

prog48hr

There will be some smoke in the skies from wildfires with the West/NW flow (2pm Wednesday chart) likely to continue next few days.

trc1_int_f18

9AM Wednesday Satellite Image:

Screen Shot 2018-08-22 at 9.52.53 AM

The “feels like” comfort factor this time of year is all about the humidity which is related to the dew point. Dew points in the 70s and 80s are tropical feeling, dew points in the mid 60s are moderately humid, but dew points below 60 are much more comfortable and very dry in the low 50s in summer:

DEW POINT END OF DAY TUESDAY:

hires_dew2m_atl_2

DEW POINT THURSDAY MORNING:

hires_dew2m_atl_31

FRIDAY MORNING DEW POINTS:

hires_dew2m_atl_55

FRIDAY AM SURFACE CHART:

Screen Shot 2018-08-22 at 10.02.25 AM

HOURLY HUMIDITY TRACE TODAY INTO MONDAY (light shade is daylight):

Screen Shot 2018-08-22 at 8.06.26 AMScreen Shot 2018-08-22 at 8.06.50 AMScreen Shot 2018-08-22 at 8.07.08 AM

53% this afternoon, 44% tomorrow afternoon, 40% Friday afternoon.

As a result of the drier air mass and high pressure a RARE sight of 3-days in a row with zero chance of a thunderstorm:

Screen Shot 2018-08-22 at 6.32.23 AM

Humidity levels will rise by Sunday and even more next week bringing a risk of a few scattered afternoon thunderstorms but low odds for this time of year and the average of the next 15 days is below-normal rainfall on the WxBell ECMWF model:

Screen Shot 2018-08-22 at 8.17.45 AM

AND THE TEMPERATURES FOR THAT PERIOD:

KATL_2018082200_min_max_16

GFS Ensemble temps above WxBell meteogram.

FOLLOW me on Twitter @MellishMeterWSB.

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