Extreme Heat and Tropical Storm Bertha Impacts

Dangerous heat will expand from the Gulf Coast into the Southern Plains and Desert Southwest through week's end. Additional extreme heat impacting the Pacific Northwest will shift to the northern Plains by the weekend. Tropical Storm Bertha is expected to continue to impact portions of the northern Gulf Coast from the western Florida Panhandle to southeastern Louisiana through tonight. Read More >

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.

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Extreme Heat and Tropical Storm Bertha Impacts

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