Alert archive / Texas / Special Weather Statements in 2017
Special Weather Statement, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this special weather statement at Jun 9, 2017, 6:52 PM CDT for Blanco County, Texas. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 9, 2017, 6:52 PM CDT (23:52 UTC)
- Expired
- Jun 9, 2017, 7:30 PM CDT
- In force
- 38 min
- Issued by
- NWS Austin/San Antonio, TX
County Blanco County, TX
The radar
The Ft Hood radar (KGRK), 86 km from the middle of the area, began a volume at 23:54 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Fort Worth, TX (KFWD), launched 12:00Z, 11.9 hours before the alert went out and 276 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1308 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 83 m²/s²
- 0-3 km storm-relative helicity
- 326 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.7
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, 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 this special weather statement went out at Jun 9, 6:50 PM CDT, 2 minutes earlier.
Area forecast discussion, Jun 9, 6:50 PM CDT, 2 minutes before
Area Forecast Discussion National Weather Service Austin/San Antonio TX 650 PM CDT Fri Jun 9 2017 .AVIATION... /00Z TAFs/ There is an isolated severe threat mainly west of AUS, and a few showers and thunderstorms have a chance to produce lightning and gusty winds in the AUS vcnty through around 03Z. Afterwards, a benign forecast is expected with most of the rapid refresh models keeping the convection just outside the San Antonio metro area. Overnight skies should be partly cloudy for the most part but pockets of mvfr cigs are expected to form over the I-35 terminals toward daybreak. CIRA SIMWRF fog product has the clouds forming first at SAT/SSF, so the forecast will continue to show a slight delay before cigs form over AUS. && .PREV DISCUSSION... /ISSUED 305 PM CDT Fri Jun 9 2017/ SHORT TERM (Tonight through Saturday)... Main forecast concern through the next 6-12 hours will center around scattered storm chances for portions of the Hill Country and I-35 corridor. Rain chances have been increased during the 5pm to 11pm time-frame to 40% these areas. A storm or two may become strong with very localized wind gusts of 30-40 mph and small hail. This risk is low and coverage is not expected to be large across the region. Please see below for more details. Water vapor and RAP analysis depict a positively tilted trough shifting across NE Texas. The base of the trough will brush across south-central Texas through the afternoon and early evening and coincide with maximum instability near 2500 J/Kg. A weak capping inversion remains in place per aircraft soundings out of KAUS and KSAT but it should weaken just enough to allow for some isolated to scattered showers and thunderstorms to develop. Such convective development has already shown some signals of occurring north of the region near a small MCV apparent on visible satellite. Hi-res model trends continue to point towards the development of these showers and storms across the east Hill Country and northern I-35 corridor. With DCAPE near 800 J/Kg and weak upper level divergence, a storm may become strong with small hail and gusty winds. These storms should not have great overall coverage and remained confined to the I-35 corridor region through the late afternoon and evening. Expect what storms do develop to weaken by midnight. Saturday will be a quieter day as the trough actually closes off over the Texas coast but the region will be on the drier northern flow, negative vorticity advection area, with slightly lower PWATs. There could be some limited sea-breeze activity along the Texas coast but it unlikely to make into the coastal plains and have gone with a dry forecast with near normal temperatures. LONG TERM (Sunday through Friday)... Seasonal pattern of sea-breeze activity will be the main set-up through late weekend and through much of next week. Coastal plains will have a 20-30% chance of rain and general thunderstorms each afternoon with some of this making into the I-35 corridor late into the afternoons each day. Areas west of I-35 will remain hot and dry with heat indices reaching into the low 100s. A weak sub-tropical atlantic H5 ridge and weak H85-H7 inverted trough along the south Texas coast will aid in moist SE flow through the week. Daily sea-breeze activity is expected with little to no expected activity west of I-35. This pattern will persist through much of next week. Areas will warm into the low to mid 90s each day with some pockets of upper 90s along the Rio Grande. Heat index values will increase to 100-105F and precautions should be used during this heat. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 70 91 72 92 73 / 40 - - 10 - Austin Bergstrom Intl Airport 68 90 71 91 72 / 40 - - 10 - New Braunfels Muni Airport 69 90 70 92 72 / 20 - - 10 - Burnet Muni Airport 68 89 69 89 70 / 40 - - 10 0 Del Rio Intl Airport 73 96 73 96 73 / - - - 0 0 Georgetown Muni Airport 69 90 71 90 72 / 40 - - 10 - Hondo Muni Airport 71 93 71 93 72 / 10 - - - 0 San Marcos Muni Airport 69 91 71 91 72 / 30 - - 10 - La Grange - Fayette Regional 69 90 72 91 73 / 20 - - 20 10 San Antonio Intl Airport 71 91 72 93 73 / 20 - - 10 0 Stinson Muni Airport 71 92 73 93 73 / 20 - - 10 0 && .EWX WATCHES/WARNINGS/ADVISORIES... None. && Mesoscale/Aviation...Oaks Synoptic/Grids...Runyen Public Service/Data Collection...YB
Hazardous weather outlook, Jun 9, 5:55 PM CDT, 57 minutes before
Hazardous Weather Outlook...UPDATED National Weather Service Austin/San Antonio TX 555 PM CDT Fri Jun 9 2017 TXZ171>173-183>194-202>209-217>225-228-102300- 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- 555 PM CDT Fri Jun 9 2017 This Hazardous Weather Outlook is for South-Central Texas.. .DAY ONE...Tonight. Isolated strong to severe storms will be possible through 9 PM across portions of the eastern Hill Country and Central Texas. These storms could continue penny to quarter sized hail and wind gusts up to 60 mph. In addition, isolated heavy downpours could result in some very localized flooding. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated.
In the hours before
Special weather statement, Jun 9, 5:52 PM CDT, 1 hour before
Special Weather Statement
National Weather Service Austin/San Antonio TX
552 PM CDT FRI JUN 9 2017
TXZ188-092330-
Gillespie TX-
552 PM CDT FRI JUN 9 2017
...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN GILLESPIE COUNTY
UNTIL 630 PM CDT...
At 552 PM CDT, Doppler radar was tracking a strong thunderstorm 8
miles west of Hilda, or 12 miles south of Mason, moving south at 10
mph.
Dime size hail and wind gusts up to 50 mph will be possible with this
storm.
Locations impacted include...
Doss and Harper.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 3050 9909 3038 9902 3031 9930 3047 9930
3050 9931
TIME...MOT...LOC 2252Z 341DEG 11KT 3057 9926
MOSpecial weather statement, Jun 9, 6:52 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Austin/San Antonio TX
652 PM CDT FRI JUN 9 2017
TXZ172-190-192-100030-
Blanco TX-Burnet TX-Travis TX-
652 PM CDT FRI JUN 9 2017
...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN TRAVIS...
NORTHEASTERN BLANCO AND SOUTHWESTERN BURNET COUNTIES UNTIL 730 PM
CDT...
At 652 PM CDT, Doppler radar was tracking a strong thunderstorm near
Spicewood, or near Marble Falls. This storm was drifting slowly to
the southwest.
Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.
Locations impacted include...
Marble Falls, Round Mountain, Horseshoe Bay, Meadowlakes, Spicewood,
Cypress Mill, Smithwick and Cottonwood Shores.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Very heavy rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3061 9804 3031 9810 3036 9817 3033 9818
3043 9850 3050 9840 3049 9835 3054 9835
3064 9821
TIME...MOT...LOC 2352Z 050DEG 4KT 3053 9822
RUNYENThe office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 5:52 PM CDT | Special Weather Statement | EWX | Gillespie | 38 min |
| Jun 9, 6:58 PM CDT | Severe Thunderstorm Warning | EWX | Blanco, Burnet, Llano, Travis | 62 min |
Nearby
Special Weather Statements in Texas, 2017Every special weather statement in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.