NWS Lubbock, TX, Modified Red Flag Threat Index (RFTI Mod) Page

The Modified Red Flag Threat Index

Matrix showing combinations of RFTI (A) and RFTI (B) for each RFTI Mod value, category, and relationship to RFW criteria. Red cells = non-RFW, maroon cells = typical RFW conditions, purple cells = very rare term values outside a 10-yr climatological database

The Modified Red Flag Threat Index (RFTI Mod) is defined as:

RFTI Mod = RFTI (A) + RFTI (B)

where:

RFTI (A) = relative humidity term (as determined by a climatological quartile ranking from 2000-2009)

RFTI (B) = wind speed term (as determined by a climatological quartile ranking from 2000-2009)

To read the full explanation of the Modified Red Flag Threat Index (RFTI Mod) CLICK HERE.