TERMIUM Plus®

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temperature-moisture index [1 record]

Record 1 2004-09-23

English

Subject field(s)
  • Atmospheric Physics
DEF

Index indicating the initiation of convective cloud.

OBS

THI = [150.0 - sfc/100 - 2(T850 + T700 + T500]) - 100PW700, where sfc is the surface elevation of the station in m; T850, T700 and T500, the 850, 700 and 500 hPa temperatures in °C; and PW700, the precipitable water in cm between the surface and the 700 hPa level. The more negative the index, the greater the probability of convective precipitation.

Key term(s)
  • temperature humidity index
  • temperature moisture index

French

Domaine(s)
  • Physique de l'atmosphère
DEF

Indice qui indique le déclenchement des nuages convectifs.

OBS

THI = [150,0 - sfc/100 - 2(T850 + T700 + T500]) - 100PW700, où sfc est l'altitude de la station en m; T850, T700 et T500, les températures en °C à 850, 700 et 500 hPa; et PW700, l'eau précipitable en cm entre la surface et le niveau 700 hPa. Plus l'indice est négatif, plus grand est le risque de précipitation convective.

Key term(s)
  • indice de température humidité

Spanish

Campo(s) temático(s)
  • Física de la atmósfera
DEF

Índice que señala el comienzo de una nube convectiva.

OBS

ITH = [150,0 - sfc/100 - 2 (T850 + T700 + T500]) - 100 PW700, donde sfc es la altura de la estación en m; T850, T700 y T500 son las temperaturas en grados C a 850, 700 y 500 hPa; y PW700 es el agua precipitable en cm entre la superficie y el nivel de 700 hPa. Cuanto más negativo es el índice, mayor es el riesgo de precipitación convectiva.

Key term(s)
  • índice de temperatura humedad
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