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September 11th and 12th: Irma remnants to bring rain and wind.

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This forecast update covers southern Illinois, southeast Missouri, western Kentucky. and extreme northwest Tennessee.
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September 11, 2017
Monday Night Forecast Details:
Forecast
:  Increasing clouds late.  Gusty winds developing.  Rain developing over the Kentucky/Tennessee border counties.  If rain develops it would move from the southeast towards the northwest.  It will rotate into the area.  Opposite of how precipitation normally moves in our region.  This will be the remnants of Irma.  Rain should spread towards southeast Missouri and southern Illinois.  Some question as to how far northwest the rain will push.  Best rain chances will be late at night.
Temperatures   MO ~ 54 to 58      IL ~ 54 to 58      KY ~ 54 to 58     TN ~ 54 to 58
Winds: North and northwest winds increasing to 15 to 30 mph.  Higher gusts possible.
What impacts are anticipated from the weather? Wet roadways.  Gusty winds developing.
My confidence in the forecast verifying: High.
Is severe weather expected? No
The NWS defines severe weather as 58 mph winds or great, 1″ hail or larger, and/or tornadoes
What is the chance of precipitation
?  MO ~ 40%    IL ~ 40%    KY ~ 70%    TN ~ 80%  (the higher rain chances arrive late at night)
Coverage of precipitation
: Increasing coverage from the southeast
Should I cancel my outdoor plans? No

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September 12, 2017
Tuesday F
orecast Details
Forecast:  Rain and scattered showers.  Gusty winds.  Cool.
Temperatures:   MO ~ 66 to 74      IL ~ 66 to 74      KY ~ 66 to 74        TN ~ 66 to 74
Winds:  North and northeast winds at 10 to 25 mph.  Higher gusts possible.
What impacts are anticipated from the weather? Wet roadways.  Gusty winds possible.
My confidence in the forecast verifying: Medium
Is severe weather expected? Unlikely, but monitor updates.
The NWS defines severe weather as 58 mph winds or great, 1″ hail or larger, and/or tornadoes
What is the chance of precipitation
?  MO ~ 60%    IL ~ 60%    KY ~ 60%    TN ~ 60%
Coverage of precipitation
: Numerous showers likely
Should I cancel my outdoor plans? Have a plan B
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Tuesday Night Forecast Details:
Forecast
:  Mostly cloudy.  Scattered rain showers.
Temperatures   MO ~ 56 to 62      IL ~ 56 to 62      KY ~ 56 to 62     TN ~ 56 to 62
Winds:  Northeast winds at 10 to 20 mph.  Gusty winds possible.
What impacts are anticipated from the weather?  Wet roadways.  Gusty winds.
My confidence in the forecast verifying: Medium
Is severe weather expected? Unlikely, but monitor updates
The NWS defines severe weather as 58 mph winds or great, 1″ hail or larger, and/or tornadoes
What is the chance of precipitation
?  MO ~ 50%    IL ~ 50%    KY ~ 50%    TN ~ 50%
Coverage of precipitation
: Scattered to perhaps numerous
Should I cancel my outdoor plans? Have a plan B

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September 13, 2017
Wednesday F
orecast Details
Forecast: Mostly cloudy.  Some remaining showers possible.  Cool.  If Irma departs faster then temperatures will be a bit higher than forecast.
Temperatures:   MO ~ 68 to 74      IL ~ 68 to 74      KY ~ 68 to 74       TN ~ 68 to 74
Winds: Southeast winds at 8 to 16 mph.  Gusty winds possible.
What impacts are anticipated from the weather? Wet roadways.  Gusty winds possible.
My confidence in the forecast verifying:  Medium
Is severe weather expected? Unlikely
The NWS defines severe weather as 58 mph winds or great, 1″ hail or larger, and/or tornadoes
What is the chance of precipitation
?  MO ~ 40%    IL ~ 40%    KY ~ 40%    TN ~ 40%
Coverage of precipitation
: Scattered, but diminishing
Should I cancel my outdoor plans? Have a plan B
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Wednesday Night Forecast Details:
Forecast
:  Some clouds.  A chance for scattered showers.  Rain should be or have ended.
Temperatures   MO ~ 55 to 60      IL ~ 55 to 60      KY ~ 55 to 60     TN ~ 55 to 60
Winds: Variable at 6 to 12 mph
What impacts are anticipated from the weather?  Perhaps wet roadways
My confidence in the forecast verifying: Medium
Is severe weather expected?  No
The NWS defines severe weather as 58 mph winds or great, 1″ hail or larger, and/or tornadoes
What is the chance of precipitation
?  MO ~ 20%    IL ~ 20%    KY ~ 20%    TN ~ 20%
Coverage of precipitation
: Scattered
Should I cancel my outdoor plans? No, but monitor updates

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September 14, 2017
Thursday F
orecast Details
Forecast: A mix of sun and clouds.  Mild.
Temperatures:   MO ~ 74 to 78      IL ~ 74 to 78     KY ~ 74 to 78       TN ~ 74 to 78
Winds: Variable winds becoming northwest at 5 to 10 mph
What impacts are anticipated from the weather? Most likely none.
My confidence in the forecast verifying: Medium
Is severe weather expected? No
The NWS defines severe weather as 58 mph winds or great, 1″ hail or larger, and/or tornadoes
What is the chance of precipitation
?  MO ~ 0%    IL ~ 0%    KY ~ 0%    TN ~ 0%
Coverage of precipitation
:  None anticipated
Should I cancel my outdoor plans? No
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Thursday Night Forecast Details:
Forecast
:  Mostly clear.
Temperatures   MO ~ 55 to 60      IL ~ 55 to 60      KY ~ 55 to 60     TN ~ 55 to 60
Winds: Variable at 4 to 8 mph
What impacts are anticipated from the weather? None
My confidence in the forecast verifying: Medium
Is severe weather expected? No
The NWS defines severe weather as 58 mph winds or great, 1″ hail or larger, and/or tornadoes
What is the chance of precipitation
?  MO ~ 0%    IL ~ 0%    KY ~ 0%    TN ~ 0%
Coverage of precipitation
: None
Should I cancel my outdoor plans?  No

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September 15, 2017
Friday Forecast Details
Forecast: Mostly sunny.  Mild.
Temperatures:   MO ~ 78 to 84      IL ~ 78 to 84      KY ~ 78 to 84      TN ~ 78 to 84
Winds: South winds at 5 to 10 mph
What impacts are anticipated from the weather? Most likely none.
My confidence in the forecast verifying: Medium
Is severe weather expected? No
The NWS defines severe weather as 58 mph winds or great, 1″ hail or larger, and/or tornadoes
What is the chance of precipitation
?  MO ~ 0%    IL ~ 0%    KY ~ 0%    TN ~ 0%
Coverage of precipitation
:  None anticipated
Should I cancel my outdoor plans? No
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Friday Night Forecast Details:
Forecast
:  Mostly clear.
Temperatures   MO ~ 56 to 62      IL ~ 56 to 62      KY ~ 56 to 62     TN ~ 56 to 62
Winds: Variable winds at 5 mph
What impacts are anticipated from the weather? None
My confidence in the forecast verifying: Medium
Is severe weather expected? No
The NWS defines severe weather as 58 mph winds or great, 1″ hail or larger, and/or tornadoes
What is the chance of precipitation
?  MO ~ 0%    IL ~ 0%    KY ~ 0%    TN ~ 0%
Coverage of precipitation
: None
Should I cancel my outdoor plans?  No

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September 16, 2017
Saturday Forecast Details
Forecast: Mostly sunny.  Mild.
Temperatures:   MO ~ 80 to 85      IL ~ 80 to 85      KY ~ 80 to 85      TN ~ 80 to 85
Winds: South winds at 5 to 10 mph
What impacts are anticipated from the weather? Most likely none.
My confidence in the forecast verifying: Medium
Is severe weather expected? No
The NWS defines severe weather as 58 mph winds or great, 1″ hail or larger, and/or tornadoes
What is the chance of precipitation
?  MO ~ 0%    IL ~ 0%    KY ~ 0%    TN ~ 0%
Coverage of precipitation
:  None anticipated
Should I cancel my outdoor plans? No
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Saturday Night Forecast Details:
Forecast
:  Mostly clear.
Temperatures   MO ~ 56 to 62      IL ~ 56 to 62      KY ~ 56 to 62     TN ~ 56 to 62
Winds: Variable winds at 5 mph
What impacts are anticipated from the weather? None
My confidence in the forecast verifying: Medium
Is severe weather expected? No
The NWS defines severe weather as 58 mph winds or great, 1″ hail or larger, and/or tornadoes
What is the chance of precipitation
?  MO ~ 0%    IL ~ 0%    KY ~ 0%    TN ~ 0%
Coverage of precipitation
: None
Should I cancel my outdoor plans?  No

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A severe thunderstorm is defined as a storm that produces quarter size hail or larger, 58 mph winds or greater, and/or a tornado.  That is the official National Weather Service definition of a severe thunderstorm

Monday night through Wednesday night:  The remnants of Hurricane Irma will push into our region.  At this time, the tornado threat appears low.  Locally heavy rain is possible with Irma, but widespread heavy rain or flash flooding is not anticipated.  Most of the area needs rain.

Gusty winds will occur on Monday night and Tuesday.  Some gusts could top 30 or perhaps even 40 mph.

Southcentral Kentucky experienced heavy rain from Harvey.  Those areas could have some water issues if heavy rain develops.  Monitor updates.
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beausanalysis

Overview

Are there any weather concerns

  1. Irma spreading rain and gusty winds into the region
  2. Below normal temperatures to continue

Short range

Confidence level in the short range forecast is high

Look at the size of Irma.  Amazing.  We are fortunate that we are not anticipating anything worse than gusty winds and some rain.

Click images to enlarge.

Harvey and Irma have wrecked havoc on many areas across the United States.  Both produced extreme damage.  Harvey dropped heavy rain into our region and now Irma will approach from the south and east.

The good news is that Irma should not produce flash flooding or extreme weather in our local area.

We will have gusty winds developing late tonight (Monday night) and those winds will continue into Tuesday.  Right now, it appears that winds of 15 to 25 mph will be the general rule.  I can’t rule out higher gusts, but widespread higher numbers seem unlikely.

The strongest winds should arrive late tonight into Tuesday morning.

Rain will also overspread portions of the area later tonight and those rain chances will linger into Wednesday.  It is possible that portions of the area receive very little in the way of measurable rainfall.

See the rainfall forecast totals below.

The highest totals should be over Kentucky and Tennessee.  Lesser totals as you move further and further west and north.

That means that Murray, Kentucky will have more rain than Farmington, Missouri.

Models differ in their totals, but not by much.  There is a general consensus that totals will mostly range from 0.40″ to 0.80″ and then pockets of one inch or more.

Here is the official WPC NOAA rainfall outlook.

Notice how the numbers are higher over our southeast counties vs northwest.

Click image to enlarge

The GFS model guidance rainfall forecast (below)

The Canadian computer model

The NAM 3K model guidance

The NAM model guidance (the lower resolution one)

The rain chances will linger into Wednesday, but I am expecting mostly scattered showers by Tuesday night and Wednesday.

The best rain chances will be tonight (Monday night) and then Tuesday into Tuesday evening.

Temperatures will be cooler than normal, because of the rain and thick clouds (at least over most of the area).

Looking further ahead

We may warm up a little bit on Friday, Saturday, and Sunday.  Perhaps lower to middle 80’s all three days.

Normal high temperatures are around 84/85 degrees.  We may move back towards normal temperatures.  Perhaps a few degrees above normal.

I continue to watch a cold front around the 16th/17th/18th.  Long way out, but monitoring it.

 

TEMPERATURE FORECAST

Temperatures will be well below normal as Irma approaches our region.  Thick clouds and rain will be the cause.

Click images to enlarge

Low temperatures for Monday night (below)

High temperatures for Tuesday (below)

Low temperatures for Tuesday night (below)

High temperatures for Wednesday

Low temperatures for Wednesday night

Dew point scale

Dew points for Tuesday

Dew points for Wednesday

Dew points for Thursday

Long range

The confidence level is medium for the long range forecast.

We should dry out Thursday through Sunday and temperatures will move closer to normal.  Highs by Friday into Sunday should rise into the lower to middle 80’s.   Closer to normal for this time of the year.

All four days should remain dry.

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Who do you trust for your weather information and who holds them accountable?

I have studied weather in our region since the late 1970’s.  I have 39 years of experience in observing our regions weather patterns.  My degree is in Broadcast Meteorology and a Bachelor’s of Science.

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There is a lot of noise on the internet.  A lot of weather maps are posted without explanation.  Over time you should learn who to trust for your weather information.

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