Weather 14th Annual Hot Air Balloon Safety Seminar. Rick Davis Senior Meteorologist National Weather Service - Tampa Bay Area. Observing the Weather. ASOS - Automated Surface Observing System. Wind Direction and Speed. Pressure measured at the Tower or other location nearby.
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14th Annual Hot Air Balloon Safety Seminar
National Weather Service - Tampa Bay Area
Observing the Weather
ASOS - Automated Surface Observing System
Wind Direction and Speed
Pressure measured at the Tower or other location nearby.
Precip type and intensity
Temp & Dew Point
Facts and Figures
Automated Weather Observing System
METAR KTPA 101955Z 33015G22KT 1/2SM FG VV002 19/19 A2955
RMK A02 PK WND 32035/1915 TWR VIS 3/4 SLP028 P0004 T01920188
Temp = 19.2 C
Dew = 18.8 C
00.04" rain in last hour
Sea level pressure 1002.8 MB
Tower visibility 3/4 mile
Peak wind northwest at 35kts at 1915Z
Automated precipitation reporting
From NWS in Ruskin
Decoding TAF Forecasts
KFMY 141542Z 141612 33030G40KT 2SM RA B KN010
TEMPO 1618 32035G44KT 3/4SM +TSRA SQ BKN008 OVC015CB
FM1800 32025G32KT P6SM BKN020
TEMPO 1821 ....
- Most detail is in first 12 hours, generalized outlook after 12 hours
- Issued four times a day at 06Z, 12Z, 18Z, and 00Z
- Format of each forecast group is wind, weather, clouds
- Naming of present weather has a strong French influence
- GR is hail >1/4 inch
- GS is hail < 1/4 inch
- FU is smoke
Station Map and Data Plot
Doppler VAD Wind Profiles
Velocity Azimuth Display
Fronts & Instability
IR satellite image overlaid with radar and fronts
Sources of Lift
Fronts and Low Pressure Systems
Cold air weighs more than warm air
cumulus cloud that
may form due to rising air reaching dewpoint
Stability = Vertical Motion
Wind = Horizontal Motion
Parcels act like bags of air
50̍ at 10,000 ft
70̍ at 5000 ft
90̍ at surface
Will this parcel rise or sink?
The parcel will rise because the air inside the parcel > air outside
(70̍ > 60̍)
Will this parcel rise or sink?
The parcel will sink because the air inside the parcel < air outside
(70̍ < 80̍)
Relating to Temperature Inversions
What happens when temperatures warm with height?
(a temperature inversion)
Sea Breeze and Outflow Boundaries
Need lifting mechanism to get parcel above inversion
Unstable, But No Storms?
Why is that?
Need additional lift to get thunderstorms to develop
Remember that indicators of stable and unstable atmospheres are instantaneous indicators. Changes in stability can be extremely rapid.
3.5 degrees F per
1000 feet of
Lapse Rate and Stability
Layer of air in which the temperature rises with height.
Radiation or Nighttime Inversion
Safety Above All Else
When is Lightning Most Dangerous?
June through September
NOAA Weather Radio
Automated All-Hazards Warning Information
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Aviation Weather Center
Norman, OK 06/28/99 (Todd Lindley)