Mid and upper-level ridge is centered over the southern plains this morning, but is just far enough inland that tropical moisture is sliding NW toward the TX coast. Radar shows scattered showers and thunderstorms across the offshore waters and a few have moved inland over the coastal counties this morning. As temperatures warm into the low to mid 90’s showers and thunderstorms will develop along the inland moving seabreeze boundary.
Upper level ridge of high pressure currently located over the SW US will back westward slightly today and weaken on the eastern flank. This will allow a trough over the southern US to move westward a bit. Local radars over LA this morning show a complex of thunderstorms east of the central LA area moving westward and convection allowing models (CAMs) are in general agreement that this complex and its associated outflow boundary will continue westward toward the Sabine River today and then into east Texas this afternoon and toward the I-45 corridor by mid to late afternoon.
Upper-level ridge of high pressure will intensify slightly today and this will add 1-2 degrees to the already very hot afternoon temperatures. Afternoon temperatures of 104-106 in the excessive heat warning area can be expected with heat index values of 108-110. Elsewhere afternoon temperatures in the 100-103 range will be common with heat index values of 107-110. College Station recorded 106 yesterday which tied its 71-year-old daily record.
An upper-level ridge of high pressure is building yet again over the southern plains, this time centered over OK and N TX where surface air temperatures will reach 108-113 degrees over the next few days. Locally SE TX is sitting at the base of the ridge and we will “only” see actual air temperatures in the low 100’s however heat index values will reach 107-112 during the afternoon hours which is good enough for another heat advisory that starts tomorrow and will likely last much of the week.
