Alert archive / Texas / Special Weather Statements in 2021

Special Weather Statement, NWS Austin/San Antonio, TX

May 4, 2021Hays County, Travis County, Texas

NWS Austin/San Antonio, TX issued this special weather statement at May 4, 2021, 8:59 AM CDT for Hays County, Travis County, Texas. It was in force for 46 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 4, 2021, 8:59 AM CDT (13:59 UTC)
Expired: May 4, 2021, 9:45 AM CDT
In force: 46 min
Issued by: NWS Austin/San Antonio, TX

Counties Hays County, TX, Travis County, TX

The radar

The Austin/San Antonio radar (KEWX), 54 km from the middle of the area, began a volume at 14:00 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.

What was reported inside it

Time	Report	Where	Remark
May 4, 9:28 AM CDT	HAIL 0.7	1 Nnw San Marcos, TX	MPING REPORT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 2.0 hours before the alert went out and 269 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2898 J/kg
Mixed-layer CIN: -186 J/kg
Mixed-layer LCL: 493 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.6

Open this sounding in Storm Lab

The text

As transmitted.

503 
WWUS84 KEWX 041359
SPSEWX

Special Weather Statement
National Weather Service Austin/San Antonio TX
859 AM CDT Tue May 4 2021
 
TXZ191>193-208-041445-
Caldwell TX-Bastrop TX-Hays TX-Travis TX-
859 AM CDT Tue May 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CALDWELL...
SOUTHEASTERN HAYS...SOUTHEASTERN TRAVIS AND SOUTHWESTERN BASTROP
COUNTIES UNTIL 945 AM CDT...

At 859 AM CDT, Doppler radar was tracking a strong thunderstorm near
Buda, moving northeast at 25 mph.

Half inch hail will be possible with this storm.

Locations impacted include...
Austin, San Marcos, Kyle, Buda, Lockhart, Tanglewood Forest, Austin
Bergstrom Int Airport, Uhland, Mustang Ridge, Niederwald, Bear Creek,
Shady Hollow, Onion Creek, Cedar Creek, Driftwood, Wyldwood, Hornsby
Bend, Manchaca, Mountain City and Sunset Valley.

LAT...LON 3036 9761 2993 9740 2985 9804 3012 9804
TIME...MOT...LOC 1359Z 243DEG 20KT 3008 9792 

$$

BRADY

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 May 4, 6:24 AM CDT, 2 hours 35 minutes earlier.

Area forecast discussion, May 4, 6:24 AM CDT, 2 hours 35 minutes before

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
624 AM CDT Tue May 4 2021

.AVIATION...
The cold front has moved through all of the area terminals and winds
have shifted to the north and northwest. The ceiling at AUS has risen
to VFR while the San Antonio airports remain MVFR. We are starting to
see isolated showers develop along the front. There is a chance for a
showers or thunderstorms to move across one of the Austin or San
Antonio terminals for the next few hours. Wind speeds will increase
over the next hour or so and become gusty. All airports will be VFR
by late morning and then remain that way through the rest of the TAF
period. Winds should decrease by around sunset.

DRT will be VFR through the entire period. Winds will be gusty until
mid-afternoon.

&&

.PREV DISCUSSION... /ISSUED 317 AM CDT Tue May 4 2021/

SHORT TERM (Today through Wednesday)...
An upper level trough is moving into West Texas and bringing a cold
front through South Central Texas. The cold front has entered our
northern area where winds have shifted to the north. Farther south
winds are still from the east and warm, moist air remains in place.
Temperatures and dewpoints are in the 70s south of about I-35. So
far as the front moves into this muggy air, it has not produced any
convection. This may change as the upper trough axis moves across
the region later today. Rain chances will increase across the area
east of I-35 between about sunrise and noon. Any storms should
remain ordinary with a lack of instability and marginal wind shear.
This afternoon rain chances will come to an end and skies will
generally clear from west to east. Cooler air will move in with high
temperatures this afternoon 10 to 15 degrees cooler than yesterday.
Winds behind the front will be breezy from the north at 10 to 20 mph
with gusts up to 35 mph. Winds will decrease as the pressure
gradient relaxes this evening. Tonight will be mainly clear with
light winds. Low temperatures Wednesday morning will be near 10
degrees cooler than today. Wednesday will be pleasant with mostly
sunny skies and warm temperatures just a couple of degrees warmer
than today.

LONG TERM (Wednesday Night through Monday)...
Much of the long-term forecast is expected to be fairly quiet.
Wednesday night will begin the period with light northeast/east winds
with lows Thursday morning reaching the 50s to lower 60s across the
area. Mostly clear skies will prevail through Friday as dry air
remains in place. Highs Thursday and Friday will be in the middle
80s to near 90 with with lows Friday in the upper 50s to middle 60s.

Warm southerly flow will make its return to the area for the weekend.
This should allow for a fairly quick return of moisture and a warm-up
for Mother's Day weekend. Highs Saturday will be in the upper 80s to
middle 90s with temperatures about 3-5 degrees warmer on Sunday.
Some of the global guidance continues to show light amounts of QPF
Saturday with the initial return of low-level moisture. This would
likely be light rain or drizzle underneath a capping inversion. Will
continue to keep the forecast dry for now as the overall threat for
any appreciable rainfall or impacts remain fairly low. The GFS is
progging the next front to arrive late Monday afternoon with its 00z
run showing a fair amount of QPF for this system. There is some
support with the 00z ECMWF with this solution while the 00z Canadian
is about 24 hours faster. Will show silent 10 PoPs on Monday for now
but PoPs in the Sunday-Monday timeframe will likely be introduced
with later forecasts if these trends continue.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              80  56  82  58  86 /  20   0   0   0   0
Austin Bergstrom Intl Airport  80  56  82  57  85 /  30   0   0   0   0
New Braunfels Muni Airport     83  58  84  58  87 /  20   0   0   0   0
Burnet Muni Airport            77  54  79  57  84 /  -    0   0   0   0
Del Rio Intl Airport           87  61  88  64  90 /   0   0   0   0   0
Georgetown Muni Airport        79  54  80  57  84 /  10   0   0   0   0
Hondo Muni Airport             85  57  86  59  89 /  10   0   0   0   0
San Marcos Muni Airport        82  56  83  57  85 /  20   0   0   0   0
La Grange - Fayette Regional   81  58  82  59  85 /  50   0   0   0   0
San Antonio Intl Airport       83  59  84  60  87 /  20   0   0   0   0
Stinson Muni Airport           85  61  84  60  88 /  20   0   0   0   0

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
None.
&&

Short-Term/Aviation...05
Long-Term...Hampshire

Hazardous weather outlook, May 4, 3:59 AM CDT, 5 hours before

Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
359 AM CDT Tue May 4 2021

TXZ171>173-183>194-202>209-217>225-228-050900-
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-
359 AM CDT Tue May 4 2021

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...Wednesday through Monday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

In the hours before

Special weather statement, May 4, 8:25 AM CDT, 34 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
825 AM CDT Tue May 4 2021

TXZ194-209-041400-
Fayette TX-Lee TX-
825 AM CDT Tue May 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN LEE AND NORTHEASTERN
FAYETTE COUNTIES UNTIL 900 AM CDT...

At 825 AM CDT, Doppler radar was tracking a strong thunderstorm 7
miles west of Round Top, or 8 miles southeast of Giddings, moving
east at 35 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Giddings, Round Top, Lake Somerville State Park & Trailway, Carmine,
Walhalla, Warrenton, Winedale, Ledbetter, Nechanitz and Waldeck.

LAT...LON 2994 9688 3014 9693 3038 9679 3032 9674
      3032 9669 3029 9664 3025 9669 3024 9674
      3020 9674 3016 9679 3014 9677 3015 9671
      3017 9669 3015 9668 3015 9665 3008 9663
      3000 9659
TIME...MOT...LOC 1325Z 251DEG 33KT 3009 9682

BRADY

Local storm report, May 4, 8:26 AM CDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
826 AM CDT TUE MAY 4 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0726 AM     HAIL             5 WNW DALE              29.97N 97.64W
05/04/2021  E0.70 INCH       CALDWELL           TX   PUBLIC

            TWITTER REPORT FROM NEAR FM1185 AND BARTH
            RD.

&&

JWZ

Local storm report, May 4, 8:35 AM CDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
835 AM CDT TUE MAY 4 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0732 AM     HAIL             6 SSW BASTROP           30.04N 97.36W
05/04/2021  E0.88 INCH       BASTROP            TX   COCORAHS

&&

JWZ

Local storm report, May 4, 8:40 AM CDT, 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
840 AM CDT TUE MAY 4 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0833 AM     HAIL             2 S MCKINNEY FALLS STAT 30.16N 97.72W
05/04/2021  E0.25 INCH       TRAVIS             TX   PUBLIC

            EASTON PARK SUBDIVISION.

&&

JWZ

Local storm report, May 4, 8:43 AM CDT, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
843 AM CDT TUE MAY 4 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0830 AM     HAIL             1 WSW SAN LEANNA        30.14N 97.83W
05/04/2021  E0.25 INCH       TRAVIS             TX   PUBLIC

            TWITTER REPORT.

&&

JWZ

Special weather statement, May 4, 8:59 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
859 AM CDT Tue May 4 2021

TXZ191>193-208-041445-
Caldwell TX-Bastrop TX-Hays TX-Travis TX-
859 AM CDT Tue May 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CALDWELL...
SOUTHEASTERN HAYS...SOUTHEASTERN TRAVIS AND SOUTHWESTERN BASTROP
COUNTIES UNTIL 945 AM CDT...

At 859 AM CDT, Doppler radar was tracking a strong thunderstorm near
Buda, moving northeast at 25 mph.

Half inch hail will be possible with this storm.

Locations impacted include...
Austin, San Marcos, Kyle, Buda, Lockhart, Tanglewood Forest, Austin
Bergstrom Int Airport, Uhland, Mustang Ridge, Niederwald, Bear Creek,
Shady Hollow, Onion Creek, Cedar Creek, Driftwood, Wyldwood, Hornsby
Bend, Manchaca, Mountain City and Sunset Valley.

LAT...LON 3036 9761 2993 9740 2985 9804 3012 9804
TIME...MOT...LOC 1359Z 243DEG 20KT 3008 9792

BRADY

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 3, 7:10 PM CDT	Special Weather Statement	EWX	Kendall	50 min
May 3, 7:12 PM CDT	Severe Thunderstorm Warning	EWX	Bexar, Comal, Medina	63 min
May 3, 7:14 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Bexar, Blanco, Gillespie, Kendall, Kerr and 1 more	61 min
May 3, 7:30 PM CDT	Areal Flood Advisory	EWX	Bandera, Bexar, Comal, Kendall, Medina	3 hr
May 3, 7:49 PM CDT	Severe Thunderstorm Warning	EWX	Bexar, Comal, Guadalupe	56 min
May 3, 8:12 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Burnet, Gillespie, Kendall, Llano	48 min
May 3, 8:19 PM CDT	Areal Flood Advisory	EWX	Bexar, Guadalupe, Wilson	3 hr
May 3, 8:23 PM CDT	Severe Thunderstorm Warning	EWX	Bexar, Guadalupe, Wilson	22 min
May 3, 8:43 PM CDT	Severe Thunderstorm Warning	EWX	Bexar, Gonzales, Guadalupe, Wilson	62 min
May 3, 8:53 PM CDT	Special Weather Statement	EWX	Burnet	52 min
May 3, 8:58 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Burnet, Llano, Travis, Williamson	62 min
May 3, 9:16 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano, Travis, Williamson	41 min
May 3, 10:08 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	30 min
May 4, 6:33 AM CDT	Special Weather Statement	EWX	Caldwell	42 min
May 4, 6:41 AM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Caldwell, Hays, Travis	64 min
May 4, 7:25 AM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Travis	50 min
May 4, 7:37 AM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Fayette, Lee	53 min
May 4, 8:05 AM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Lee, Travis, Williamson	13 min
May 4, 8:20 AM CDT	Special Weather Statement	EWX	Hays, Travis	40 min
May 4, 8:22 AM CDT	Special Weather Statement	EWX	Lee	38 min
May 4, 8:22 AM CDT	Special Weather Statement	EWX	Lee	38 min
May 4, 8:25 AM CDT	Special Weather Statement	EWX	Lee	35 min
May 4, 9:27 AM CDT	Special Weather Statement	EWX	Guadalupe	33 min
May 4, 9:48 AM CDT	Special Weather Statement	EWX	Bastrop	27 min
May 4, 9:58 AM CDT	Special Weather Statement	EWX	Caldwell	47 min
May 4, 10:04 AM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Caldwell, Fayette	41 min
May 4, 10:38 AM CDT	Special Weather Statement	EWX	Bastrop	37 min

Nearby

Special Weather Statements in Texas, 2021 Every special weather statement in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.