00 inches across South Central Texas. Thunderstorms formed along a mesoscale boundary and produced locally heavy rain that led to flash flooding.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS EWX wrote it up.
Persistent deep layer easterly flow increased precipitable water values to near 2.00 inches across South Central Texas. Thunderstorms formed along a mesoscale boundary and produced locally heavy rain that led to flash flooding. A CoCoRAHS observer recorded 6.81 inches of rain in Grey Forest in northwestern Bexar County.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Austin/San Antonio, TX wrote its last area forecast discussion before the first event at Jul 9, 8:49 AM CST, 2 hours 20 minutes earlier.
Area Forecast Discussion National Weather Service Austin/San Antonio TX 949 AM CDT Mon Jul 9 2018 .UPDATE... Cluster of showers and isolated thunderstorms continues northwest of San Antonio into the Hill Country as mid level shear axis combines with lower level jet hitting the higher terrain of the Escarpment. Have boosted POPs for this morning across those areas. Expect low level jet to mix out by midday, then heating will allow showers and thunderstorms to become more scattered and maintained POPs as currently advertised. Remainder of forecast on track with today being the last day of POPs areawide. && .PREV DISCUSSION... /ISSUED 638 AM CDT Mon Jul 9 2018/ AVIATION... /12Z TAFS/ Scattered showers and isolated storms are moving north over the Hill Country into the Austin metro area. Much of this activity is concentrating along a low level E-W oriented cyclonic shear axis that should slowly lift north during the day. Thus only some spotty convective activity is expected to impact the I-35 terminals in the next 1 to 2 hours with a few hours of benign weather before daytime heating regenerates some air mass convection by mid afternoon. More continuous convection is suggested in the rapid refresh models for DRT so will leave a vague vcsh inclusion for all of the day as long as the convection impacts continue to look minimal for them on radar. Some lingering ifr cigs continue along I-35 and another few hours of mvfr cigs should finish out much of the morning. Meanwhile, DRT has remained above mvfr levels; will leave as such, but a brief dip into mvfr is possible in the next hour or two. Ifr cigs may redevelop along I-35 late tonight. PREV DISCUSSION... /ISSUED 332 AM CDT Mon Jul 9 2018/ SHORT TERM (Today through Tuesday)... Upper air analysis last evening showed a broad ridge over the country with easterly flow over central Texas. Surface winds were generally light from the southeast and dewpoint temperatures were in the upper 60s to lower 70s. Deep layer easterly flow will continue today keeping deep moisture in place. This flow will leave the atmosphere uncapped, but with very little vertical wind shear. We expect another day of isolated to scattered showers and thunderstorms particularly during the afternoon. Convection will be diurnally driven and will dissipate through the evening. Mid-level winds will shift slightly to the southeast tonight and this will bring drier air over the region leading to decreasing chances for convection Tuesday. The best chances Tuesday will be over the southeast. LONG TERM (Tuesday Night through Sunday)... Drier mid-level flow will continue through the week. This will mean no chance for rain for most of the area. There may be enough moisture over the east counties for slight chances for rain each day through Saturday. Each day the area for possible convection will shrink to the east. With the decrease in rain and associated cloudiness, temperatures will increase through the week. Highs will climb above normal and stay there through the end of the period. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 89 74 95 76 96 / 60 20 20 - 10 Austin Bergstrom Intl Airport 90 73 95 75 95 / 60 20 20 - 20 New Braunfels Muni Airport 91 74 95 74 95 / 50 20 20 - 10 Burnet Muni Airport 88 72 94 74 94 / 60 30 20 10 10 Del Rio Intl Airport 91 75 96 77 98 / 50 30 10 - - Georgetown Muni Airport 89 73 95 75 95 / 60 20 20 10 20 Hondo Muni Airport 91 73 95 74 97 / 50 20 10 - 10 San Marcos Muni Airport 91 74 95 74 96 / 50 20 20 - 10 La Grange - Fayette Regional 90 75 94 76 94 / 50 20 30 10 20 San Antonio Intl Airport 91 74 95 76 96 / 50 20 20 - 10 Stinson Muni Airport 92 74 95 75 96 / 50 20 20 - 10 && .EWX WATCHES/WARNINGS/ADVISORIES... None. && Mesoscale/Aviation...BMW Synoptic/Grids...04 Public Service/Data Collection...EWilliams
Hazardous Weather Outlook National Weather Service Austin/San Antonio TX 548 AM CDT Mon Jul 9 2018 TXZ171>173-183>194-202>209-217>225-228-101100- Llano-Burnet-Williamson-Val Verde-Edwards-Real-Kerr-Bandera- Gillespie-Kendall-Blanco-Hays-Travis-Bastrop-Lee-Kinney-Uvalde- Medina-Bexar-Comal-Guadalupe-Caldwell-Fayette-Maverick-Zavala- Frio-Atascosa-Wilson-Karnes-Gonzales-De Witt-Lavaca-Dimmit- 548 AM CDT Mon Jul 9 2018 This Hazardous Weather Outlook is for South-Central Texas.. .DAY ONE...Today And Tonight. Scattered showers and thunderstorms are expected today and into the evening across South-Central Texas. Severe thunderstorms are not expected at this time. However, heavy downpours of 1 to 2 inches, gusty winds and frequent lightning strikes will be possible with the stronger thunderstorms. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated.
The Austin/San Antonio radar (KEWX), 59 km away, was scanning. The volume nearest the first event began at 17:07 UTC.
2 flash flood. Local standard time, as filed.
Thunderstorms produced heavy rain that led to flash flooding closing several low water crossings in northwestern Bexar County.
Thunderstorms produced heavy rain that led to flash flooding closing several roads in and around Leon Valley.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2018Every state in 2018This day in weather historyWarnings in Texas, July 2018
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 773716, 773717.