Download Weather Apps: Great Tools for Successful Fields Weather Apps

1/29/2016
Weather Apps: Great Tools for
Successful Fields
Brad Jakubowski,
Doane College, Crete NE
yj
@
[email protected]
“If you don't like the weather
wait 5 minutes and it'll
change!”
…Will Rogers
Unstable Air
1
1/29/2016
Stable Air
Weather
High: 83ºF
High: 84ºF
High: 82ºF
High: 111ºF
High: 111ºF
High: 108ºF
2 hrs
Why such a difference
in temps?
Which city is experiencing
the greater humidity?
(Has the most actual water
vapor in the air)?
It’s all about…
Heat
Water
Water’s Changes of State
Ice melting absorbs HEAT
Anyone make ice cream?
80 calories per gram
Evaporation absorbs HEAT
Anyone syringe their turf?
600 calories per gram
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1/29/2016
Condensation
RELEASES HEAT
600 calories per gram
Water’s Changes of State
Freezing releases
HEAT
Moisture Holding Capacity of Air
The amount of
water air holds
depends on
temperature
Cooler Air holds
less moisture
Warmer air
holds more
moisture
80 calories per gram
Relative Humidity (%Humidity):
Is a Ratio
Amount of H2O in air
How much H2O air can hold
• Indicates how near air is to
being 100% saturated with
water
• NOT actual amount of water in
the air
Total Water
Vapor Air
can Hold
Which location is
more humid
100% R.H. @ 0ºF
(Has more total
moisture)?
Moisture Holding Capacity of Air
100%
00% X 1= 1g/kg
g/ g
Actual
Amount of
Water
Location A
Location B
10% R.H. @ 100ºF
10% X 45=4.5g/kg
65% Relative
Humidity
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1/29/2016
Relative Humidity changes with Temperature
Dew Point
or Dew Point Temperature
• The temperature at
which dew, clouds or
frost forms
• Occurs when the air
temp and dewpoint
meet
• Dewpoint is a direct
indicator of how
much moisture is in
the air
Dewpoint / Moisture Content
Total Water
Vapor Air
can Hold
Actual
Amount of
Water
www.forgetmeknottphotography.com
Does actual water vapor content
change?
Dew Point 57ºF
So:
High dew point
temps = moist air
Low dew point
temps = dry air
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1/29/2016
October 26
Air Temp 37ºF
Dewpoint / Moisture Content
0.5
Which city is experiencing
the greater humidity?
(Has the most actual water
vapor in the air)?
What overnight conditions can we
expect?
What are we really looking at?
• Feels like ____
– Wind Chill or Heat Index
– Based on:
• Wind
• Humidity
• Temperature
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1/29/2016
What are we really looking at?
What are we really looking at?
• Humidity ____
• Dewpoint ____
Does this tell us how
humid it really is?
This really DOES tell us
how humid it is.
Just how close the air is
to not being able to
keep water molecules
suspended in motion.
What are we really looking at?
Barometric Pressure and Pressure Systems
• Pressure ____
– 1013 mb is standard
The weight of the air
above us
• Is it increasing or is it
decreasing? OR
• Is air falling or rising?
Low Pressure
• rising air
• falling barometer
High Pressure
• descending air
• rising barometer
Pressure, Isobars and Wind
http://www.wunderground.com/maps/
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1/29/2016
Radar Imaging
What are we really looking at?
• Radar
Measures:
– Precipitation
• Rain, hail, etc…
– Direction it is falling
• Does NOT measure
clouds!
What are we really looking at?
What are we really looking at?
• Radar
• Radar
What could this line tell
us?
What could this line tell
us?
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1/29/2016
Thunderstorm Development along a Cold Front
(window of hours)
• Cold Fronts can
produce vertically
stacked clouds and
stormy weather
• Warm fronts produce
horizontal clouds and
steady rain and
drizzle
Warm Front Precipitation
(~2-3 day window)
Management Decisions Based on
Weather Information
“Home” Pages
Weather Channel
NOAA Weather Free
Wunderground
You have a cold front coming through the night before a
2 pm softball game.
Parents will be traveling long distances.
The forecast is:
• ¾ - 1 inch of rain overnight
• 28°dewpoints,
p
, sunny,
y, breezy:
y Will yyou need to call the game?
g
Most likely, NO!
• The dewpoints are low enough to allow the water to
evaporate
What about a 65 degree dewpoint forecast?
Not as likely to play under those conditions.
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1/29/2016
“Home” Pages
Intellicast
Accuweather
“Home” Pages
Weatherbug
NWS
Weather Channel
Weatherbug
NWS Mobile
NWS Mobile
NWS Full Site
Intellicast
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1/29/2016
NWS Full Site
Review
• Pick the items most important to YOU!
• Keep in mind what you are really looking
at
• Don’t
D ’t b
be afraid
f id to
t look
l k around
d
• Remember the NWS is the source of all of
the information anyway
• Questions??
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