Good Monday Morning! It has been active morning across South-Central Texas. A small area of low pressure developed and help enhance precipitation across San Antonio since 4 AM. A quick two to four inches of rain has fallen and is still falling at this point. Flash flooding will continue in San Antonio through at least 8 AM. Many roads are experiencing high water issues. If you’re heading out and about this morning in S.A make sure you give yourself a lot of extra time. We’ve seen comparatively lighter rain across portions of North Texas, East Texas, the Concho Valley, Hill Country, South Texas, and Rio Grande Valley. The cool front has actually made decent progress overnight into South-Central and Southeast Texas, but drier air is still lagging behind near the Red River.
Rain chances will continue much of today in the Borderland, Trans-Pecos Basin, Concho Valley, Southwest Texas, Central Texas, South-Central Texas, South Texas, the Rio Grande Valley, Middle-Texas Coast, Brazos Valley, into East Texas, and Southeast Texas. The most widespread and heavier activity should be in relative proximity of Interstate 10 and areas south of that. Drier air filtering in from near the Red River will help to slowly end rain chances north of Interstate 20 with time today. Localized flash flooding will remain possible with heavier activity through the day. This is especially true if we see additional heavy rain fall over areas that have seen several inches of rain over the past couple of days. Activity will be slow-moving.
Rain chances will diminish from north to south this afternoon and into tonight with drier air filtering in. Scattered showers, some with heavy rain, will remain possible Monday Night in the Borderland, Southwest Texas, into Deep SOuth Texas, the Rio Grande Valley, and areas close to the coast. Isolated showers could occur as far north as the Concho Valley, Central Texas, and the piney woods of East Texas. A few instances of flooding may continue to be a problem tonight in South Texas.
Rain chances on Tuesday will mainly be relegated to the Rio Grande Valley. Drier air filtering in from the north will help bring an end to rain chances north of Interstate 10. A shower can’t be totally ruled out – especially earlier in the day – near that corridor. We’ll have to watch for isolated flooding in the Rio Grande Valley if we see any heavier rains develop. Otherwise, noticeably lower humidity values are expected along and north of Interstate 10. Speaking of which – lets get to the point everyone wants to know – where are the fall temperatures?
One only needs to look north into the Texas Panhandle. Temperatures have fallen into the lower to mid 40s overnight as drier air has filtered in. Now I don’t think we’ll be seeing lower 40s in Central Texas by Tuesday but we will have much drier air filtering down the pike. The cooler/drier air lags several hundred miles behind the actual cold front, a glorified wind shift line. We’ll start to see the drier air make headway south/east today and especially tonight.
High temperatures this afternoon will top out in the upper 60s to upper 70s from the Texas Panhandle and Borderland east through Northwest Texas, the Big Country, Concho Valley, North Texas, Central Texas, and Northeast Texas. The higher elevations around Alpine, Marfa, and the Davis Mountains will likely struggle to get above the middle to upper 50s with rain chances and gusty winds. Temperatures in Southeast Texas into the Rio Grande Valley will top out in the lower 90s with rain/storm chances today. We’ll see temperatures a few degrees cooler for those folks on Tuesday.
Temperatures tonight and by sunrise on Tuesday should be in the 40s and 50s across the Borderland, Permian Basin, Concho Valley, Big Country, West Texas, the Texas Panhandle, Northwest Texas, and western sections of North Texas. The heat island of D/FW will probably bottom out in the low 60s, but outlying communities west and north of D/FW should be able to get into the lower 50s. Temperatures will drop off into the 60s across East Texas, Central Texas, into South Texas where clouds will be more widespread this evening and tonight. The coastline and Rio Grande Valley will remain in the lower 70s with continued rain chances.
Finally temperatures on Tuesday will top out in the 70s and 80s across much of Texas. Humidity values will be noticeably lower as a drier air mass settles into Texas. Dewpoints this last week were in the 60s and 70s. For the rest of this week we should be able to keep them in the 40s, 50s, to lower 60s. They’ll be a bit higher near the coast but still noticeably lower than this past week. This will be our first real good taste of fall with highs near or just below average and much drier air.