Atmospheric Micro-Calc 84
MODE: DEW-POINT °C / %RH
12.3 °C
T: 22.0°C | RH: 55% M: READY
FIELD PRESETS Select scenario
DERIVED METEOROLOGICAL TELEMETRY NOAA / WMO FORMULAS
Dew Point (Td)
12.3 °C
Magnus-Tetens psychrometric
Heat Index (HI)
22.0 °C
Rothfusz regression matrix
Wind Chill (Wc)
N/A
T > 10°C (Inapplicable)
Cloud Base (AGL)
1,212 m
Espy's lifting condensation level
Vapor Pressure (e)
14.54 hPa
Saturation: 26.44 hPa
Density Altitude
310 m
ICAO Standard Atmosphere
PAPER TAPE AUDIT TRAIL
RTWEATHER AUDIT TAPE [STATION 1790920000] ---------------------------------------- SYSTEM BOOT: RT-1984 VFD READY PARAMS: T=22.0°C | RH=55% | WS=3.0m/s | P=1013.25hPa DERIVED: DEW POINT: 12.3°C HEAT INDEX: 22.0°C WIND CHILL: N/A CLOUD BASE: 1,212 m ----------------------------------------

Atmospheric Formulas & Physical Constants

The RTWeather retro unit computes psychrometric and environmental indices according to standard World Meteorological Organization (WMO) and National Oceanic and Atmospheric Administration (NOAA) specifications:

• Dew Point (Magnus-Tetens): γ(T, RH) = (17.27 × T) / (237.7 + T) + ln(RH/100) with Td = (237.7 × γ) / (17.27 - γ).
• Heat Index: Calculated via multi-variable Rothfusz polynomial regression with high-humidity adjustments for warm humid boundaries.
• Wind Chill: Standard Joint Action Group for Temperature Indices (JAG/TI) equation: Wc = 13.12 + 0.6215×T - 11.37×V^0.16 + 0.3965×T×V^0.16 (valid for T ≤ 10°C and V ≥ 1.3 m/s).
• Cumulus Cloud Base: Espy's condensation formula approximation: H ≈ 125 × (T - Td) meters above ground level.

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