Alert archive / Texas / Special Weather Statements in 2020
Special Weather Statement, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this special weather statement at Aug 18, 2020, 4:29 PM CDT for Kinney County, Uvalde County, Texas. It was in force for 46 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
- Aug 18, 2020, 4:29 PM CDT (21:29 UTC)
- Expired
- Aug 18, 2020, 5:15 PM CDT
- In force
- 46 min
- Issued by
- NWS Austin/San Antonio, TX
Counties Kinney County, TX, Uvalde County, TX
The radar
The Laughlin AFB radar (KDFX), 33 km from the middle of the area, began a volume at 21:31 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
Del Rio, TX (KDRT), launched 12:00Z, 9.5 hours before the alert went out and 29 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
- 189 J/kg
- Mixed-layer CIN
- -193 J/kg
- Mixed-layer LCL
- 1580 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -34 m²/s²
- 0-3 km storm-relative helicity
- -1 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Aug 18, 2:37 PM CDT, 1 hour 52 minutes earlier.
Area forecast discussion, Aug 18, 2:37 PM CDT, 1 hour 52 minutes before
Area Forecast Discussion National Weather Service Austin/San Antonio TX 237 PM CDT Tue Aug 18 2020 .SHORT TERM (Tonight through Wednesday Night)... Unstable northerly flow aloft in combination with surface heating today has lead to scattered storm activity developing over our western zones. Water vapor imagery show a band of drier air in the mid levels working it's way down out of North Texas this afternoon and should bring an end to rain chances this evening. Along this boundary between drier air, some high res members suggest additional development over the northern extend of the Hill Country and the I- 35 corridor later this afternoon. Given the drier air that has made it into the boundary layer over the past day, an inverted V profile is still present in forecast soundings this afternoon. Any strong storm with enough instability could give way to a strong downburst, upwards of 40 mph, through evaporative cooling leading to dense, rain-cooled air dropping out of the storm. Coverage of storms this afternoon and evening can be described as scattered to widespread for our western zones and isolated to scattered for our northern zones. Tonight, mostly clear skies with lows ranging from the upper 60s to mid 70s. Dewpoints in the mid 60s and clearing skies should allow most areas to dip into the low 70s with the more urbanized areas holding onto a bit warmer temps in the mid 70s. Winds should be light and variable overnight and becoming northeasterly by daybreak. Dry forecast for the end of the short term period as the subtropical high slowly slides southeastward and begins to expand over the state. South Central Texas will still be on the eastern fringes of the high and could see northeast winds around 10-15 mph for Wednesday afternoon. Although rain chances dwindle, drier air stays around with continental flow over the region and will keep heat indices suppressed. && .LONG TERM (Thursday through Tuesday)... By Thursday night, winds are back out of the southeast and the humidity begins to go back up. Otherwise, the forecast goes pretty much unchanged with hot and dry conditions with only very little chances for coastal convection along our southeastern counties. A couple of areas of interest in the tropics are being watched. An area in the Caribbean currently has a 70% chance of cyclone development within the next five days according to the National Hurricane Center. It is still too soon to know any details and we will continue to monitor and update the forecast as necessary. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 75 99 72 99 73 / - 0 0 0 0 Austin Bergstrom Intl Airport 70 99 70 98 72 / 10 0 0 0 0 New Braunfels Muni Airport 73 99 70 99 72 / 10 0 0 0 0 Burnet Muni Airport 69 96 69 96 71 / - 0 0 0 0 Del Rio Intl Airport 75 100 75 103 76 / 10 - - 0 0 Georgetown Muni Airport 68 96 70 99 72 / - 0 0 0 0 Hondo Muni Airport 72 101 72 102 73 / 20 - 0 0 0 San Marcos Muni Airport 71 99 70 99 71 / 10 0 0 0 0 La Grange - Fayette Regional 70 99 72 100 73 / 10 0 0 0 0 San Antonio Intl Airport 76 100 73 100 74 / 20 0 0 0 0 Stinson Muni Airport 76 101 73 100 73 / 20 0 0 0 0 && .EWX WATCHES/WARNINGS/ADVISORIES... None. && Short-Term/Aviation...EWilliams Long-Term...YB Decision Support...Platt
Hazardous weather outlook, Aug 18, 4:54 AM CDT, 11 hours 35 minutes before
Hazardous Weather Outlook National Weather Service Austin/San Antonio TX 454 AM CDT Tue Aug 18 2020 TXZ171>173-183>194-202>209-217>225-228-191000- 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- 454 AM CDT Tue Aug 18 2020 This Hazardous Weather Outlook is for South-Central Texas.. .DAY ONE...Today And Tonight. Isolated thunderstorms are expected over South Central Texas again today. A few storms could produce gusty winds up to 50 mph. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. No other hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated.
In the hours before
Special weather statement, Aug 18, 4:29 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Austin/San Antonio TX
429 PM CDT Tue Aug 18 2020
TXZ202-203-217-218-182215-
Maverick TX-Uvalde TX-Kinney TX-Zavala TX-
429 PM CDT Tue Aug 18 2020
...SIGNIFICANT WEATHER ADVISORY FOR KINNEY...NORTHERN MAVERICK...
WESTERN UVALDE AND NORTHWESTERN ZAVALA COUNTIES UNTIL 515 PM CDT...
At 428 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Standart to near Spofford to 7 miles west
of Cline to 8 miles southeast of Laguna to near Concan. Movement was
southwest at 20 mph.
Winds in excess of 40 mph will be possible with these storms.
Locations impacted include...
Uvalde, Brackettville, Spofford, Quemado, Laguna, Blewett, Concan,
Darling, Amanda, Washer, Uvalde Estates, Montell, Dabney, Cline,
Garner State Park, Anacacho, Reagan Wells, Standart, Alamo Village
and Laughlin AFB Aux Field.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
These storms 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 2896 10065 2909 10067 2917 10078 2920 10077
2923 10080 2924 10079 2924 10076 2925 10076
2926 10075 2929 10074 2932 10075 2934 10071
2950 10070 2960 9965 2900 9985 2893 10057
TIME...MOT...LOC 2128Z 048DEG 13KT 2930 10061 2921 10042 2925 10019
2930 9994 2946 9976
CPThe office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 7:53 PM CDT | Special Weather Statement | EWX | Atascosa | 37 min |
| Aug 17, 8:42 PM CDT | Areal Flood Advisory | EWX | Frio | 3 hr |
| Aug 18, 4:45 PM CDT | Severe Thunderstorm Warning | EWX | Kinney, Maverick | 37 min |
| Aug 18, 6:08 PM CDT | Special Weather Statement | EWX | Val Verde | 52 min |
Nearby
Special Weather Statements in Texas, 2020Every special weather statement in 2020
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.