Clouds

					          Clouds
A brief guide on clouds types,
 cloud observing, and time.
Have you ever looked at clouds
and wondered if they had
names?
                • Luke Howard did over
                    200 years ago.
                •   He decided that
                    clouds could be
                    classified into three
                    main categories.
                •   He used Latin to
                    name the clouds.
Three main cloud types
 • Cirrus (Latin for Curl)
    – means hair and describes wispy looking clouds. This term is also
      used to describe high level clouds


•Cumulus (Latin for heap)
   –means pile and describes heaped, lumpy clouds



 •Stratus (Latin for layer)
    –means layer and describes clouds that
    form in sheets and do not have any    http://asd-www.larc.nasa.gov/SCOOL/

    unique features
                  (Wispy, Horse tail)
                      Cirrus




 Stratus                                Cumulus
(Layered, Flat)                         (Cotton Ball)
You’ve learned the basic types
of clouds…let’s get go on to
deluxe clouds.
• Nimbus (Latin for Rain)
  – use this term only when a cloud actually produces
    precipitation

                         •Alto
                            – describes mid-level clouds




                                      Pictures from http://asd-www.larc.nasa.gov/SCOOL/
Let’s combine names.


                                            • Cirrocumulus
                                              – Can best be described
                                                as a high cloud that
                                                resembles fish scales



      http://asd-www.larc.nasa.gov/SCOOL/
                  (Wispy, Horse tail)
                      Cirrus


                                        Cirrocumulus    (Fish Scale)




 Stratus                                       Cumulus
(Layered, Flat)                                (Cotton Ball)
Let’s combine names.



                                      • Stratocumulus
                                        – Best described as a
                                          cloud accident or puffy
                                          bottoms
http://asd-www.larc.nasa.gov/SCOOL/
                        (Wispy, Horse tail)
                             Cirrus


                                              Cirrocumulus    (Fish Scale)




 Stratus              Stratocumulus                  Cumulus
(Layered, Flat)   (Puffy bottoms, cloud accident)    (Cotton Ball)
Let’s combine names.


                                      • Nimbostratus
                                        – Looks like a stratus
                                          cloud but it is
                                          producing precipitation

http://asd-www.larc.nasa.gov/SCOOL/
                                   (Wispy, Horse tail)
                                        Cirrus

                                                   Cirrocumulus     (Fish Scale)




          Stratus                                             Cumulus
                                  Stratocumulus
        (Layered, Flat)                                       (Cotton Ball)
                            (Puffy bottoms, cloud accident)

     Nimbostratus
(low blanket with lots of rain)
       Let’s combine names.

                                                    • Altocumulus
                                                      – Mid-level cloud
                                                      – Described as flocks of
                                                        sheep or streets of
                                                        clouds

                                                    •Altostratus
                                                       –Mid-level cloud
                                                       –Light gray layer
                                                       –Light behind the clouds


Pictures from http://asd-www.larc.nasa.gov/SCOOL/
                                         (Wispy, Horse tail)
                                              Cirrus

                                                         Cirrocumulus          (Fish Scale)




                Altostratus                                     Altocumulus
 (Light grey, light behind clouds)                              (Streets of clouds,
                                                                    flock of sheep)




            Stratus                                                       Cumulus
                                      Stratocumulus
           (Layered, Flat)                                                (Cotton Ball)
                                  (Puffy bottoms, cloud accident)

    Nimbostratus
(low blanket with lots of rain)
Let’s combine names.

                •Cirrostratus
                  –High-level cloud
                  –Thin veil of clouds
                  –Produces a sun or
                     moon halo
                                     (Wispy, Horse tail)
                                          Cirrus

                     Cirrostratus                    Cirrocumulus          (Fish Scale)
             (Thin, veil,sun/moon halo)


             Altostratus                                    Altocumulus
(Light grey, light behind clouds)                           (Streets of clouds, flock of shee




         Stratus                                                   Cumulus
                                    Stratocumulus
       (Layered, Flat)                                             (Cotton Ball)
                              (Puffy bottoms, cloud accident)

       Nimbostratus
(low blanket with lots of rain)
 Let’s combine names.


                                      •Cumulonimbus
                                        •Thunderclouds
                                        •Storm makers
                                        •Produce lightening and
                                           thunder

http://asd-www.larc.nasa.gov/SCOOL/
                                     (Wispy, Horse tail)
                                          Cirrus

                     Cirrostratus                    Cirrocumulus          (Fish Scale)
             (Thin, veil,sun/moon halo)


             Altostratus                                    Altocumulus
(Light grey, light behind clouds)                           (Streets of clouds, flock of sheep)




         Stratus                                                   Cumulus
                                    Stratocumulus
       (Layered, Flat)                                             (Cotton Ball)
                              (Puffy bottoms, cloud accident)

       Nimbostratus                                                    Cumulonimbus
(low blanket with lots of rain)                                      (Thunderstorm clouds)
          Man-made clouds•                          Contrails
                                                     – Short for condensation
                                                       trails.
                                                     – Made by airplanes
                                                     – 3 types

                                                    • Short lived
                                                    • Persistent
                                                    • Persistent
                                                     Spreading

Pictures from http://asd-www.larc.nasa.gov/SCOOL/
                                          (Wispy, Horse tail)
                                              Cirrus
                       Cirrostratus                     Cirrocumulus           (Fish Scale)
                (Thin, veil,sun/moon halo)

                                                            Altocumulus
                   Altostratus
                                                            (Streets of clouds, flock of sheep)
      (Light grey, light behind clouds)


             Stratus
                                                                         Cumulus
           (Layered, Flat)
                                          Stratocumulus                 (Cotton Ball)
    Nimbostratus                   (Puffy bottoms, cloud accident)
                                                                       Cumulonimbus
ow blanket with lots of rain)
                                                                     (Thunderstorm clouds)
                                             Contrails
            Short-lived
            Persistent
            Persistent Spreading
         1      2       3        4    5    6     7     8     9       10

 1                                                                         Imagine
 2                                                                           this
 3
                                                                           picture
 4
                               http://asd-www.larc.nasa.gov/SCOOL/
 5                                                                        represents
 6                                                                        a certain
 7
                                                                          number of
 8
 9                                                                        clouds in
 10                                                                        the sky !

http://asd-www.larc.nasa.gov/SCOOL/
       1       2       3        4     5   6   7   8   9   10
 1
 2
 3
 4
 5
 6                                                             Be ready
 7                                                             with an
 8                                                             answer in
 9                                                             5 seconds !
 10


http://asd-www.larc.nasa.gov/SCOOL/
                                      Write your guess
                                      down your white
                                      board and hold it up
                                      high.




http://asd-www.larc.nasa.gov/SCOOL/
                         LET’S OBSERVE!
                                          Let’s make an
                                          observation
                                          on what we
                                          see on this
                                          beautiful day!

                                          What cloud
                                          types are
                                          present?

                                          What’s the
                                          percentage of
                                          cloud cover?

                                          How much
                                          light
                                          penetrates
                                          the clouds?




http://asd-www.larc.nasa.gov/SCOOL/
                  Time Terms

• Local Standard Time
  – The time established for a region by law, or general use -
    it's the time you see on a correctly set clock, if you're not
    in daylight savings time (summer)
                Time Terms
• 24 hour Time or Military Time
  – In military time, the hours are numbered from
    00 to 23.
  – Under this system, midnight is 00, 1 a.m. is 01,
    1 p.m. is 13, and so on.
     • Try it: 2:30 pm
     • An event occurs on Wednesday at 0001 PST. This
       translates to one minute past midnight PST on
       Wednesday morning.
     • 6:11 a.m. is the same as 0611 (or 06:11) military
       time.
     • 13:17:42 military time is the same as forty-two
       seconds past 1:17 in the afternoon.
            Time Terms

• Universal Time or What time is it in
 Greenwich, England
  – Standard time at longitude = 0 (the
    longitude line which goes through
    Greenwich, England) which is used as a
    standard around the world to assist in
    synchronizing data collection.
              Time Terms
• Universal Time Offset and Conversion
     • Current Universal Time (UT): 21:04
1. Write down current local time: ___h ___m

2.    Add 7 hours (We are 7 hours behind UT)
     ____h ____ m

3.    Convert to 24 hour clock:   ___h ___m

				
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