MAHTE Climatology Complete Dataset

This dataset contains information for all Mesoscale Airmasses with High Theta-e (MAHTEs) collected from the Automated Surface Observing System (ASOS) for the period of January 2000 through June 2022. Data are provided in a .csv file, with each row corresponding to an individual MAHTE. Each column corresponds to one of the following data points:

station: four letter code corresponding to the ASOS station where the MAHTE was identified

index:  line within the monthly ASOS text file where the MAHTE was identified (after erroneous/incomplete lines have been removed)

datetime: date/time of MAHTE identification

mahteflag: series of internal flags detailing MAHTE identification process, appearing in the following order

w1: indicates passage of wind test

t1: indicates passage of thermodynamic tests

r0/r1: indicates a retrograding/progressive MAHTE, respectively

s1: indicates passage of size test

w1: unused relic of previous algorithm version

dthte: change in theta-e across the boundary (cool side — warm side, regardless of MAHTE orientation)

dtemp: change in temperature across the bounary (cool side — warm side, regardless of MAHTE orientation)

u0: ground speed of boundary

width: width of MAHTE

duration: residence time of MAHTE over the ASOS station

thermodelay: time required to obtain the required thermodynamic shift for passage of thermodynamic tests (0 = five minutes, 1 = ten minutes)

envdwptdep: dew point depression on the warm side of boundary

mahtedwptdep: dep point depression within the MAHTE

mahtecape: Convective Available Potential Energy (CAPE) within the MAHTE

envcape: CAPE on the warm side of the boudnary

mahte06bwd: 0-6 bulk wind difference within the MAHTE

env06bwd: 0-6 bulk wind difference on the warm side of the boundary

ddwpt: change in dew point depression across the boundary (warm side — cool side, regardless of MAHTE orientation)