FXUS64 KHGX 201832 AFDHGX Area Forecast Discussion National Weather Service Houston/Galveston TX 132 PM CDT Fri Mar 20 2026 ...New DISCUSSION, MARINE... .KEY MESSAGES... - A strong heat dome over the Southwest will keep temperatures well above average through the weekend and persist next week. - Persistent southerly flow will bring areas of fog late at night and into the early mornings. Some of this fog could be locally dense, especially for areas along and south of I-10. && .DISCUSSION... Issued at 127 PM CDT Fri Mar 20 2026 Dry and unseasonably warm conditions will persist across the region through the weekend as a robust mid to upper level ridge remains anchored over the Southwestern CONUS. This feature continues to provide strong subsidence, effectively suppressing precipitation and boosting afternoon temperatures well above late March climatological norms. At the surface, high pressure to our east will maintain a steady southerly flow, ushering in a warm and moist airmass. Guidance remains consistent with 850 mb temperatures into the 18-21 degC range. This thermal profile translates to surface highs into the upper 80s to low 90s, particularly across the Brazos Valley. While the probability of exceeding 90F diminishes slightly as you move eastward (east of I-45), much of the area will still see temperatures in the mid 80s over the next several days. With persistent onshore flow and decent low-level moisture, radiation fog is expected to develop during the late night and early morning hours through at least Sunday. Some areas may see locally dense fog, with the highest probabilities focused along and south of the I-10 corridor. The upper-level ridging will flatten slightly early next week in response to a weak and dry cool front. Models suggest this boundary will approach the region on Monday before it begins to retrograde and stall just north of the area. No significant impacts or airmass changes are expected...the forecast remains dry and warm. The ridge aloft is forecast to strengthen and shift/expand further east into our area, reinforcing the dry pattern and increasing temperatures to well-above normal. && .AVIATION... (12Z TAF Issuance) Issued at 621 AM CDT Fri Mar 20 2026 Conditions bouncing from MVFR to LIFR in some areas this morning with areas of patchy dense fog. These areas of fog should burn off after sunrise, returning all terminals to VFR conditions. This holds through the majority of today before probabilities jump again on additional fog Friday night into Saturday morning, possibly more widespread. This could bring IFR to even LIFR vis and ceilings. && .MARINE... Issued at 127 PM CDT Fri Mar 20 2026 High pressure centered over north-central Gulf will continue to bring light to occasionally moderate onshore winds S to SSE) and low seas over the next several days. Seas will generally remain into the 1 to 3 ft range, occasionally up to 4 ft during the weekend. Rain is not anticipated, but areas of fog will be possible in areas adjacent to the bays and the islands early in the mornings. && .PRELIMINARY POINT TEMPS/POPS... College Station (CLL) 86 59 91 61 / 0 0 0 0 Houston (IAH) 86 62 89 64 / 0 0 0 0 Galveston (GLS) 75 66 77 67 / 0 0 0 0 && .HGX WATCHES/WARNINGS/ADVISORIES... TX...None. GM...None. && $$ DISCUSSION...JM AVIATION...Lisney MARINE...JM