An upper level shortwave trough moved over a warm, moist airmass and generated isolated thunderstorms. One of these storms produced large hail.
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The episode as NWS EWX wrote it up.
An upper level shortwave trough moved over a warm, moist airmass and generated isolated thunderstorms. One of these storms produced large hail.
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 Apr 19, 11:42 AM CST, 58 minutes earlier.
Area Forecast Discussion National Weather Service Austin/San Antonio TX 1242 PM CDT Tue Apr 19 2022 ...New AVIATION... .SHORT TERM... (Today through Wednesday) Issued at 146 AM CDT Tue Apr 19 2022 Weak ridging aloft over the southern high Plains will flatten some through today as a relatively weak shortwave trough moves through the upper flow. Meanwhile at the surface, high pressure currently centered over N MO and IA is leading to curved flow locally with ENE winds over much of the region becoming ESE near the Rio Grande. Pressure gradient tightens today as the high center shifts to the Mid-South, and 10-20 mph SE winds will gust to 20-30 mph at times today, highest west. Moisture is already increasing across the Rio Grande Plains this morning and cloud cover will develop there through sunrise and gradually build eastward during the day. As a result, high temperatures today will only be in the mid 70s to low 80s for most, perhaps mid 80s far southwest. Model soundings indicate moisture will deepen quickly today, with Pwats up to 1-1.3" by 12Z out west and continuing to rise to 1.5- 1.7" by midday for the southwestern quarter of our area. Weak isentropic lift is expected later this morning west, and drizzle and/or isolated showers may begin to develop after sunrise. Low POPs (20-30%) will spread slowly eastward through the day to perhaps the US-281 corridor by mid-afternoon. An isolated thunderstorm cannot be ruled out today across Val Verde or Edwards County, but otherwise if any SDB convection develops it would not reach the river. Rainfall amounts will be light today, less than 0.10" for the most part. As we head through the evening and overnight, can't rule out some upslope-enhanced isolated light rain shifting eastward across the Hill Country to the I-35 corridor, and the exiting weak shortwave should take most of any lingering light rain chances with it by Wednesday morning. Much warmer lows are forecast Wednesday morning due to the high Tds, in the 60s to near 70. Model soundings depict subsidence strengthening the capping inversion during the day and so no thunderstorm development is expected, and in fact the latest SPC outlook update has removed general thunder from much of the area as a result. Skies should gradually clear from W to E. Look for highs in the mid 80s to low 90s. && .LONG TERM... (Wednesday night through Monday) Issued at 146 AM CDT Tue Apr 19 2022 The beginning of the long-term forecast should start out dry as upper flow remains weak. Breezy southerly flow at the surface will prevail with speeds in the 12-20 mph range and highs in the upper 80s to middle 90s across the area. Upslope flow west of the Rio Grande could lead to some storms west of the border but not anticipating any of this activity making it into our CWA. On Friday, a weak shortwave embedded in the westerly flow could lead to some activity a bit farther east and will mention 20 PoPs for western Val Verde County Friday afternoon. Otherwise, breezy southerly flow will continue with highs again in the upper 80s to middle 90s. A large trough axis will move into the western CONUS for this weekend. Ahead of this feature, southerly flow in the lower levels will increase which could lead to some mainly isolated to scattered showers ahead of an approaching cold front across a decent portion of the area by Sunday afternoon. Highs this weekend should be in the lower 80s to middle 90s with lows in the 60s and 70s. The trough axis should begin to move into the Southern Plains by Sunday afternoon. This should send the frontal boundary into the CWA beginning Sunday evening into Sunday night. Models are coming into better agreement that this front may actually bring a decent chance of rainfall to much of the area Sunday night into Monday. Will continue to assess over the next several days but this is the best signal for a beneficial rainfall in quite some time. Let's toast to && .AVIATION... (18Z TAFS) Issued at 1233 PM CDT Tue Apr 19 2022 MVFR ceilings have moved over most of the area. AUS is on the edge of this cloud deck and will be VFR/MVFR for the next couple of hours. By mid-afternoon they will be down to MVFR. Then all airports will be MVFR through the afternoon and evening. In the San Antonio area the ceilings will drop to IFR overnight and rebound back to MVFR Wednesday morning. There is a slight chance for showers this afternoon and evening, but the probability is too low to include in the TAFs. Winds will be from the southeast at 10 to 15 kts with gusts up to 25 kts at all airports. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 68 87 70 88 / 20 10 0 0 Austin Bergstrom Intl Airport 67 87 69 88 / 20 10 0 0 New Braunfels Muni Airport 67 88 69 90 / 20 10 0 10 Burnet Muni Airport 66 87 69 87 / 20 0 0 0 Del Rio Intl Airport 71 92 72 95 / 20 0 0 10 Georgetown Muni Airport 67 88 70 88 / 20 10 0 0 Hondo Muni Airport 67 89 68 92 / 20 0 0 10 San Marcos Muni Airport 66 87 68 89 / 20 10 0 0 La Grange - Fayette Regional 68 85 70 88 / 20 10 0 0 San Antonio Intl Airport 68 87 70 88 / 20 10 0 10 Stinson Muni Airport 69 91 71 92 / 20 0 0 10 && .EWX WATCHES/WARNINGS/ADVISORIES... None. && Short-Term...KCW Long-Term...29 Aviation...05
Hazardous Weather Outlook National Weather Service Austin/San Antonio TX 304 AM CDT Tue Apr 19 2022 TXZ171>173-183>194-202>209-217>225-228-200815- 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- 304 AM CDT Tue Apr 19 2022 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.
Special Weather Statement
National Weather Service Austin/San Antonio TX
1156 AM CDT Tue Apr 19 2022
TXZ183-191730-
Val Verde TX-
1156 AM CDT Tue Apr 19 2022
...A strong thunderstorm will impact portions of northwestern Val
Verde County through 1230 PM CDT...
At 1156 AM CDT, Doppler radar was tracking a strong thunderstorm near
Pandale, or 28 miles west of Juno, moving southeast at 25 mph.
HAZARD...Penny size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to outdoor objects is possible.
Locations impacted include...
Pandale.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3029 10163 3029 10144 3022 10121 2998 10134
3018 10170
TIME...MOT...LOC 1656Z 296DEG 23KT 3023 10158
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...<30 MPH
RUNYENSpecial Weather Statement
National Weather Service Austin/San Antonio TX
1243 PM CDT Tue Apr 19 2022
TXZ183-191830-
Val Verde TX-
1243 PM CDT Tue Apr 19 2022
...A strong thunderstorm will impact portions of northeastern Val
Verde County through 130 PM CDT...
At 1243 PM CDT, Doppler radar was tracking a strong thunderstorm near
Juno, moving east at 35 mph.
HAZARD...Winds in excess of 40 mph and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Loma Alta, Juno, Bakers Crossing, Vinegarone and Devils River State
Nat Area Del Norte.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3023 10124 3008 10070 3006 10070 2978 10082
3005 10134
TIME...MOT...LOC 1743Z 292DEG 33KT 3010 10119
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH
MOSpecial Weather Statement
National Weather Service Austin/San Antonio TX
109 PM CDT Tue Apr 19 2022
TXZ183-191845-
Val Verde TX-
109 PM CDT Tue Apr 19 2022
...A strong thunderstorm will impact portions of southeastern Val
Verde County through 145 PM CDT...
At 109 PM CDT, Doppler radar was tracking a strong thunderstorm near
Seminole Canyon State Park, or 8 miles southwest of Comstock, moving
east at 40 mph.
HAZARD...Winds in excess of 40 mph and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Comstock, Lake View, Amistad Village, Black Brush Point, Amistad
Acres, Seminole Canyon State Park, Box Canyon, Diablo East, Long
Point, Governors Landing, Cienegas Terrace, Devils Shores, Pafford
Crossing, San Pedro Canyon, Rough Canyon Recreation Area, Spur 406
Campground, Rock Quarry Campground, Salem Point, Lake Ridge Ranch and
277 North Campground.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
If on or near Lake Amistad, get out of the water and move indoors or
inside a vehicle. Remember, lightning can strike out to 10 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.
&&
LAT...LON 2970 10135 2968 10086 2937 10095 2941 10104
2946 10106 2947 10115 2952 10118 2952 10125
2962 10125 2963 10127 2958 10128 2958 10131
2961 10131 2965 10130 2966 10135 2965 10136
TIME...MOT...LOC 1809Z 286DEG 33KT 2962 10130
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH
RUNYENThe Laughlin AFB radar (KDFX), 80 km away, was scanning. The volume nearest the first event began at 18:39 UTC.
1 hail. Local standard time, as filed.
A thunderstorm produced quarter size hail off Castle Canyon Estate Rd. north of Lake Amistad.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2022Every state in 2022This day in weather historyWarnings in Texas, April 2022
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: 1021266.