The upper level ridge retreated to the north and allowed thunderstorms to develop in the southeasterly flow off the Gulf of Mexico. Some of these storms produced damaging wind gusts.
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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.
The upper level ridge retreated to the north and allowed thunderstorms to develop in the southeasterly flow off the Gulf of Mexico. Some of these storms produced damaging wind gusts.
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 Jun 13, 12:23 PM CST, 1 hour 19 minutes earlier.
Area Forecast Discussion National Weather Service Austin/San Antonio TX 123 PM CDT Wed Jun 13 2018 .AVIATION... Streamer shower activity eased off a bit from a robust late morning start, but should gain a second wind from sea breeze boundary interactions into peak heating. Thus will account for some brief vsby reductions from rain shafts in tempo groups at I-35 sites before 00Z. There could be isolated thunderstorms and gusty winds but expect those impacts to be more isolated. Convection continues to amplify over the Rio Grande Plains so may need to include DRT for a similar time window. Late in the period, more daybreak mvfr cigs are expected to occur with most of the clouds being scattered variable broken in this increasingly tropical airmass. && .PREV DISCUSSION... /ISSUED 901 AM CDT Wed Jun 13 2018/ MORNING UPDATE... Some morning convection has been noted this morning in the vicinity of Bexar and surrounding counties due to some modest upper level divergence and 2000+ j/kg of SBCAPE already available. Weak shear should keep these minor, and as of yet, no lightning has been observed, but with PWAT values over 1.6" according to the RAP, can't rule out a couple locally heavy downpours that could result in a quick quarter inch of rain. Thus, have made some adjustments to PoP/Wx/QPF to add isolated chances before 18Z and increased PoPs for the afternoon hours as well. PREV DISCUSSION... /ISSUED 630 AM CDT Wed Jun 13 2018/ AVIATION... MVFR ceilings at all terminals will continue until late morning when they will all rebound to VFR. Winds will increase to 10 to 15 kts and continue into the evening. There will be a slight chance for thunderstorms in Austin and San Antonio this afternoon, but the probability is too low to include in the TAFs. Any storms will likely lower visibility to MVFR briefly. MVFR ceilings will develop again overnight in Austin and San Antonio. PREV DISCUSSION... /ISSUED 358 AM CDT Wed Jun 13 2018/ SHORT TERM (Today through Thursday)... The mid and upper level ridge is forecast to flatten to the north today and Thursday opening the southeastern half of the CWA up to increased moisture and low chances for diurnally driven showers and thunderstorms. Coverage appears to be isolated today with a slight uptick on Thursday. High temperatures slightly cooler than previous days, but still above normal. LONG TERM (Thursday Night through Tuesday)... The flattened upper level ridge to the north of the region Thursday is forecast to move east and amplify into the Mississippi River Valley Friday through the weekend. This will allow an inverted upper level trough and associated tropical wave over the southwest Gulf of Mexico to move northwest toward Texas. Currently the National Hurricane Center is giving the disturbed area of weather, currently over the western Caribbean, a low chance for tropical cyclone formation over the next 5 days as it emerges into the southwest Gulf of Mexico. The current forecast assumes the feature remains an open wave, similar to several runs of the GFS and the persistent ECMWF, and as such the deeper plume of tropical moisture eventually making it into South Central Texas. If organization were to occur significant adjustments to the PoP forecast could be required either up or down. With that said, initially an increase in tropical moisture ahead of the wave looks to arrive Saturday with an increase in coverage of showers and storms expected across mainly eastern and southern areas. The main surge with the tropical wave looks to take place Sunday and Sunday night into the Texas coast and portions of South Central Texas. Both the ECMWF and GFS are in good agreement with the initial deeper fetch of tropical moisture pulled northward into portions of the Upper Texas Coast Sunday night into Monday morning where a band of heavier precipitation is shown. This could include far eastern areas of the CWA. Nevertheless, a decent increase in moisture further west into the CWA should lead to at least scattered coverage of showers and storms Sunday and Monday. Both the ECMWF and GFS indicate the ridge to the east slowly retrograding west Monday night through Wednesday, with the inverted trough and deeper moisture plume being dragged westward into central and eventually western portions of the CWA. The details are still uncertain with the speed of the ridge building in from the east and placement of the inverted trough and exact placement of deeper plume of moisture over the CWA during this time, but it does appear generally favorable for higher PoPs. If things come together it can't be ruled out for some nocturnal banding taking place Monday and Tuesday nights. Model and WPC QPF has slowly trended upward. Generally we are forecasting 1-3 inches over the area Sunday through Tuesday. There could certainly be pockets of heavier rainfall, possibly double these amounts, if banding occurs and given the tropical nature of the airmass. It is too soon to say with any confidence where this would occur. Again this all assumes the feature remains an open wave. Forecast details will be further refined through the later half of the week and into the weekend. As a reminder, it should continued to be stressed to follow trusted sources, such as then National Hurricane Center, for outlooks on potential tropical development during hurricane season. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 95 74 95 74 94 / 30 10 20 10 20 Austin Bergstrom Intl Airport 95 73 94 74 94 / 30 10 20 10 20 New Braunfels Muni Airport 95 72 94 73 94 / 30 10 20 10 20 Burnet Muni Airport 93 71 93 72 93 / 20 10 10 10 10 Del Rio Intl Airport 98 74 96 76 97 / 10 10 10 10 0 Georgetown Muni Airport 95 72 94 73 93 / 20 10 20 10 20 Hondo Muni Airport 97 73 95 73 95 / 30 10 20 10 10 San Marcos Muni Airport 96 73 95 73 94 / 30 10 20 10 20 La Grange - Fayette Regional 96 73 95 74 94 / 30 10 30 10 30 San Antonio Intl Airport 95 74 95 75 94 / 30 10 20 10 20 Stinson Muni Airport 95 74 94 75 94 / 30 10 20 10 20 && .EWX WATCHES/WARNINGS/ADVISORIES... None. && Mesoscale/Aviation...Oaks Synoptic/Grids...TB3 Public Service/Data Collection...YB
Hazardous Weather Outlook National Weather Service Austin/San Antonio TX 500 AM CDT Wed Jun 13 2018 TXZ171>173-183>194-202>209-217>225-228-141000- 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- 500 AM CDT Wed Jun 13 2018 This Hazardous Weather Outlook is for South-Central Texas.. .DAY ONE...Today And Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Tropical moisture will move into Texas this weekend bringing a chance for an extended rain event Sunday through Tuesday. Locally heavy rain may be possible at some time during this period. Otherwise, no hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated.
The Austin/San Antonio radar (KEWX), 64 km away, was scanning. The volume nearest the first event began at 19:44 UTC.
2 thunderstorm wind, 1 hail. Local standard time, as filed.
A thunderstorm produced wind gusts estimated at 75 mph that uprooted a tree, knocked down some wood fencing and some tree limbs, and collapsed a metal awning in northwestern San Antonio.
A thunderstorm produced wind gusts estimated at 65 mph that knocked down some large tree limbs in the Wildwood subdivision in northwestern San Antonio.
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, June 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: 761646, 761630, 761647.