Alert archive / Texas / Flash Flood Watches in 2018
Flash Flood Watch 5, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood watch at Sep 13, 2018, 2:43 PM CDT for 26 counties in Texas. It took effect at Sep 14, 2018, 7:00 AM CDT. It was in force for 60 hr.
The area
The counties it named.
The facts
- Issued
- Sep 13, 2018, 2:43 PM CDT (19:43 UTC)
- In effect from
- Sep 14, 2018, 7:00 AM CDT
- Expired
- Sep 16, 2018, 7:00 PM CDT
- In force
- 60 hr
- Issued by
- NWS Austin/San Antonio, TX
- Flood severity
- None
All 26 counties
Atascosa County, TX, Bandera County, TX, Bexar County, TX, Blanco County, TX, Caldwell County, TX, Comal County, TX, DeWitt County, TX, Dimmit County, TX, Edwards County, TX, Frio County, TX, Gillespie County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Karnes County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Lavaca County, TX, Maverick County, TX, Medina County, TX, Real County, TX, Uvalde County, TX, Val Verde County, TX, Wilson County, TX, Zavala County, TX
The radar
The Austin/San Antonio radar (KEWX), 86 km from the middle of the area, began a volume at 19:45 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 (KDLF), launched 12:00Z, 7.7 hours before the alert went out and 191 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
- 226 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 619 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- 9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
046 WGUS64 KEWX 131943 FFAEWX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Austin/San Antonio TX 243 PM CDT Thu Sep 13 2018 ...LOCALLY HEAVY RAINFALL LEADING TO FLASH FLOODING POSSIBLE FRIDAY THROUGH SATURDAY... .Deep moisture, associated with a tropical disturbance over the western Gulf of Mexico, will move into South Central Texas on Friday and persist through the weekend. Showers and thunderstorms will produce periods of tropical downpours during this time. There is the potential for some bands of heavier rainfall to develop, but it is currently difficult to pinpoint exactly where. Much of the region is near-saturated from recent rainfall, and any additional heavy rainfall could quickly lead to flash flooding. There is a potential the watch could be expanded further north or west. TXZ185>187-189-202>207-217>225-228-141000- /O.NEW.KEWX.FF.A.0005.180914T1200Z-180916T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Real-Kerr-Bandera-Kendall-Kinney-Uvalde-Medina-Bexar-Comal- Guadalupe-Maverick-Zavala-Frio-Atascosa-Wilson-Karnes-Gonzales- De Witt-Lavaca-Dimmit- Including the cities of Leakey, Kerrville, Bandera, Boerne, Bracketville, Uvalde, Hondo, San Antonio, New Braunfels, Seguin, Eagle Pass, Crystal City, Pearsall, Pleasanton, Floresville, Karnes City, Gonzales, Cuero, Halletsville, and Carrizo Springs 243 PM CDT Thu Sep 13 2018 ...FLASH FLOOD WATCH IN EFFECT FROM FRIDAY MORNING THROUGH SATURDAY EVENING... The National Weather Service in Austin/San Antonio has issued a * Flash Flood Watch for a portion of south central Texas, including the following areas, Atascosa, Bandera, Bexar, Comal, De Witt, Dimmit, Frio, Gonzales, Guadalupe, Karnes, Kendall, Kerr, Kinney, Lavaca, Maverick, Medina, Real, Uvalde, Wilson, and Zavala. * From Friday morning through Saturday evening * Scattered to numerous showers and thunderstorms will impact the region. Between 2 and 4 inches of rainfall, with isolated pockets up to 8 inches, are possible. Due to sensitivity of nearly-saturated grounds over the area, any additional heavy rains will result in quick run-off and an increased risk for flash flooding. * Flooding of low water crossings and urban areas is possible. If you encounter a flooded roadway, Turn Around, Don't Drown! PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
7 follow-up statements
441 WGUS64 KEWX 140828 FFAEWX Flood Watch National Weather Service Austin/San Antonio TX 328 AM CDT Fri Sep 14 2018 ...LOCALLY HEAVY RAINFALL LEADING TO FLASH FLOODING POSSIBLE TODAY THROUGH SATURDAY... .A disorganized tropical disturbance over the western Gulf of Mexico, will move into South Central Texas later today and bring a surge of deep tropical moisture into South Central Texas through the weekend. Showers and thunderstorms will produce periods of tropical downpours through this weekend. There is the potential for some bands of heavier rainfall to develop, but it is currently difficult to pinpoint exactly where. Much of the region is near- saturated from recent rainfall, and any additional heavy rainfall could quickly lead to flash flooding. There is a potential the watch could be expanded further north or west. TXZ185>187-189-202>207-217>225-228-142100- /O.CON.KEWX.FF.A.0005.180914T1200Z-180916T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Real-Kerr-Bandera-Kendall-Kinney-Uvalde-Medina-Bexar-Comal- Guadalupe-Maverick-Zavala-Frio-Atascosa-Wilson-Karnes-Gonzales- De Witt-Lavaca-Dimmit- Including the cities of Leakey, Kerrville, Bandera, Boerne, Bracketville, Uvalde, Hondo, San Antonio, New Braunfels, Seguin, Eagle Pass, Crystal City, Pearsall, Pleasanton, Floresville, Karnes City, Gonzales, Cuero, Halletsville, and Carrizo Springs 328 AM CDT Fri Sep 14 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 7 AM CDT THIS MORNING THROUGH SATURDAY EVENING... The Flash Flood Watch continues for * A portion of south central Texas, including the following areas, Atascosa, Bandera, Bexar, Comal, De Witt, Dimmit, Frio, Gonzales, Guadalupe, Karnes, Kendall, Kerr, Kinney, Lavaca, Maverick, Medina, Real, Uvalde, Wilson, and Zavala. * From 7 AM CDT this morning through Saturday evening * Scattered to numerous showers and thunderstorms will impact the region. Widespread 1 to 3 inches of rainfall are expected through Saturday evening, with isolated pockets up to 5 inches possible. Due to sensitivity of nearly-saturated grounds over the area, any additional heavy rains will result in quick run- off and an increased risk for flash flooding. * Flooding of low water crossings and urban areas is possible. If you encounter a flooded roadway, Turn Around, Don't Drown! PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
334 WGUS64 KEWX 141910 FFAEWX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Austin/San Antonio TX 210 PM CDT Fri Sep 14 2018 ...LOCALLY HEAVY RAINFALL LEADING TO FLASH FLOODING POSSIBLE TODAY THROUGH SATURDAY... .A disorganized tropical disturbance over the western Gulf of Mexico, will move into South Central Texas later tonight through Saturday night and bring a surge of deep tropical moisture into the region. Showers and thunderstorms will produce periods of tropical downpours through this weekend. There is the potential for some bands of heavier rainfall to develop, but it is currently difficult to pinpoint exactly where. Much of the region is near- saturated from recent rainfall, and any additional heavy rainfall could quickly lead to flash flooding. TXZ183-184-151000- /O.EXB.KEWX.FF.A.0005.000000T0000Z-180916T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Val Verde-Edwards- Including the cities of Del Rio and Rocksprings 210 PM CDT Fri Sep 14 2018 ...FLASH FLOOD WATCH IN EFFECT THROUGH SUNDAY MORNING... The National Weather Service in Austin/San Antonio has expanded the * Flash Flood Watch to include a portion of south central Texas, including the following areas, Edwards and Val Verde. * Through Sunday morning * Scattered to numerous showers and thunderstorms will impact the region. Widespread 1 to 3 inches of rainfall are expected through Saturday night, with isolated pockets near 7 inches possible. Due to sensitivity of nearly-saturated grounds over the area, any additional heavy rains will result in quick run- off and an increased risk for flash flooding. * Flooding of low water crossings and urban areas is possible. If you encounter a flooded roadway, Turn Around, Don't Drown! PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ TXZ188-190-191-208-151000- /O.EXA.KEWX.FF.A.0005.000000T0000Z-180916T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Gillespie-Blanco-Hays-Caldwell- Including the cities of Fredericksburg, Blanco, San Marcos, and Lockhart 210 PM CDT Fri Sep 14 2018 ...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY EVENING... The National Weather Service in Austin/San Antonio has expanded the * Flash Flood Watch to include a portion of south central Texas, including the following areas, Blanco, Caldwell, Gillespie, and Hays. * Through Saturday evening * Scattered to numerous showers and thunderstorms will impact the region. Widespread 1 to 3 inches of rainfall are expected through Saturday evening, with isolated pockets near 7 inches possible. Due to sensitivity of nearly-saturated grounds over the area, any additional heavy rains will result in quick run- off and an increased risk for flash flooding. * Flooding of low water crossings and urban areas is possible. If you encounter a flooded roadway, Turn Around, Don't Drown! PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ TXZ185-202-203-217-218-228-151000- /O.EXT.KEWX.FF.A.0005.000000T0000Z-180916T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Real-Kinney-Uvalde-Maverick-Zavala-Dimmit- Including the cities of Leakey, Bracketville, Uvalde, Eagle Pass, Crystal City, and Carrizo Springs 210 PM CDT Fri Sep 14 2018 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH SUNDAY MORNING... The Flash Flood Watch is now in effect for * A portion of south central Texas, including the following areas, Dimmit, Kinney, Maverick, Real, Uvalde, and Zavala. * Through Sunday morning * Scattered to numerous showers and thunderstorms will impact the region. Widespread 1 to 3 inches of rainfall are expected through Saturday night, with isolated pockets near 7 inches possible. Due to sensitivity of nearly-saturated grounds over the area, any additional heavy rains will result in quick run- off and an increased risk for flash flooding. * Flooding of low water crossings and urban areas is possible. If you encounter a flooded roadway, Turn Around, Don't Drown! PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ TXZ186-187-189-204>207-219>225-151000- /O.CON.KEWX.FF.A.0005.000000T0000Z-180916T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Kerr-Bandera-Kendall-Medina-Bexar-Comal-Guadalupe-Frio-Atascosa- Wilson-Karnes-Gonzales-De Witt-Lavaca- Including the cities of Kerrville, Bandera, Boerne, Hondo, San Antonio, New Braunfels, Seguin, Pearsall, Pleasanton, Floresville, Karnes City, Gonzales, Cuero, and Halletsville 210 PM CDT Fri Sep 14 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY EVENING... The Flash Flood Watch continues for * A portion of south central Texas, including the following areas, Atascosa, Bandera, Bexar, Comal, De Witt, Frio, Gonzales, Guadalupe, Karnes, Kendall, Kerr, Lavaca, Medina, and Wilson. * Through Saturday evening * Scattered to numerous showers and thunderstorms will impact the region. Widespread 1 to 3 inches of rainfall are expected through Saturday evening, with isolated pockets near 7 inches possible. Due to sensitivity of nearly-saturated grounds over the area, any additional heavy rains will result in quick run- off and an increased risk for flash flooding. * Flooding of low water crossings and urban areas is possible. If you encounter a flooded roadway, Turn Around, Don't Drown! PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
694 WGUS64 KEWX 150837 FFAEWX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Austin/San Antonio TX 337 AM CDT Sat Sep 15 2018 ...LOCALLY HEAVY RAINFALL LEADING TO FLASH FLOODING POSSIBLE TODAY AND SUNDAY... .Bands of showers and thunderstorms will produce periods of tropical downpours through this weekend. When and where these bands will develop is difficult to pinpoint, but the threat for heavy rainfall from them will persist as long as an associated area of low pressure lingers in southern Texas. Much of the watch area is near-saturated from recent rainfall, and any additional heavy rainfall could quickly lead to flash flooding. TXZ186>189-204-205-219-220-161200- /O.EXT.KEWX.FF.A.0005.000000T0000Z-180916T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Kerr-Bandera-Gillespie-Kendall-Medina-Bexar-Frio-Atascosa- Including the cities of Kerrville, Bandera, Fredericksburg, Boerne, Hondo, San Antonio, Pearsall, and Pleasanton 337 AM CDT Sat Sep 15 2018 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH SUNDAY MORNING... The Flash Flood Watch is now in effect for * A portion of south central Texas, including the following areas, Atascosa, Bandera, Bexar, Frio, Gillespie, Kendall, Kerr, and Medina. * Through Sunday morning * Scattered to numerous showers and thunderstorms will impact the region. Widespread 1 to 3 inches of rainfall are expected through Saturday evening, with isolated pockets near 7 inches possible. Due to sensitivity of nearly-saturated grounds over the area, any additional heavy rains will result in quick run- off and an increased risk for flash flooding. * Flooding of low water crossings and urban areas is possible. If you encounter a flooded roadway, Turn Around, Don't Drown! PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ TXZ183>185-202-203-217-218-228-161200- /O.CON.KEWX.FF.A.0005.000000T0000Z-180916T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Val Verde-Edwards-Real-Kinney-Uvalde-Maverick-Zavala-Dimmit- Including the cities of Del Rio, Rocksprings, Leakey, Bracketville, Uvalde, Eagle Pass, Crystal City, and Carrizo Springs 337 AM CDT Sat Sep 15 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SUNDAY MORNING... The Flash Flood Watch continues for * A portion of south central Texas, including the following areas, Dimmit, Edwards, Kinney, Maverick, Real, Uvalde, Val Verde, and Zavala. * Through Sunday morning * Scattered to numerous showers and thunderstorms will impact the region. Widespread 1 to 3 inches of rainfall are expected through Saturday night, with isolated pockets near 7 inches possible. Due to sensitivity of nearly-saturated grounds over the area, any additional heavy rains will result in quick run- off and an increased risk for flash flooding. * Flooding of low water crossings and urban areas is possible. If you encounter a flooded roadway, Turn Around, Don't Drown! PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ TXZ190-191-206>208-221>225-160000- /O.CON.KEWX.FF.A.0005.000000T0000Z-180916T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Blanco-Hays-Comal-Guadalupe-Caldwell-Wilson-Karnes-Gonzales- De Witt-Lavaca- Including the cities of Blanco, San Marcos, New Braunfels, Seguin, Lockhart, Floresville, Karnes City, Gonzales, Cuero, and Halletsville 337 AM CDT Sat Sep 15 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING... The Flash Flood Watch continues for * A portion of south central Texas, including the following areas, Blanco, Caldwell, Comal, De Witt, Gonzales, Guadalupe, Hays, Karnes, Lavaca, and Wilson. * Through this evening * Scattered to numerous showers and thunderstorms will impact the region. Widespread 1 to 3 inches of rainfall are expected through Saturday evening, with isolated pockets near 7 inches possible. Due to sensitivity of nearly-saturated grounds over the area, any additional heavy rains will result in quick run- off and an increased risk for flash flooding. * Flooding of low water crossings and urban areas is possible. If you encounter a flooded roadway, Turn Around, Don't Drown! PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
208 WGUS64 KEWX 160131 FFAEWX Flood Watch National Weather Service Austin/San Antonio TX 831 PM CDT Sat Sep 15 2018 ...LOCALLY HEAVY RAINFALL LEADING TO FLASH FLOODING POSSIBLE TODAY AND SUNDAY... .Bands of showers and thunderstorms will produce periods of tropical downpours through this weekend. When and where these bands will develop is difficult to pinpoint, but the threat for heavy rainfall from them will persist as long as an associated area of low pressure lingers in southern Texas. Much of the watch area is near-saturated from recent rainfall, and any additional heavy rainfall could quickly lead to flash flooding. TXZ183>189-202>205-217>220-228-161200- /O.CON.KEWX.FF.A.0005.000000T0000Z-180916T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Val Verde-Edwards-Real-Kerr-Bandera-Gillespie-Kendall-Kinney- Uvalde-Medina-Bexar-Maverick-Zavala-Frio-Atascosa-Dimmit- Including the cities of Del Rio, Rocksprings, Leakey, Kerrville, Bandera, Fredericksburg, Boerne, Bracketville, Uvalde, Hondo, San Antonio, Eagle Pass, Crystal City, Pearsall, Pleasanton, and Carrizo Springs 831 PM CDT Sat Sep 15 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 AM CDT SUNDAY... The Flash Flood Watch continues for * A portion of south central Texas, including the following areas, Atascosa, Bandera, Bexar, Dimmit, Edwards, Frio, Gillespie, Kendall, Kerr, Kinney, Maverick, Medina, Real, Uvalde, Val Verde, and Zavala. * Until 7 AM CDT Sunday * Scattered to numerous showers and thunderstorms will impact the region. Widespread 1 to 3 inches of rainfall are expected through Saturday night, with isolated pockets near 5 inches possible. Due to sensitivity of nearly-saturated grounds over the area, any additional heavy rains will result in quick run- off and an increased risk for flash flooding. * Flooding of low water crossings and urban areas is possible. If you encounter a flooded roadway, Turn Around, Don't Drown! PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
477 WGUS64 KEWX 160827 FFAEWX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Austin/San Antonio TX 327 AM CDT Sun Sep 16 2018 ...PERIODS OF HEAVY RAINFALL LEADING TO LOCALIZED FLASH FLOODING POSSIBLE TODAY... .A low pressure system located near Eagle Pass early this morning will result in bands of showers with embedded thunderstorms moving across portions of South Central Texas today. These bands will be capable of producing isolated 4 inch rainfall amounts through this evening as they wrap around the low pressure system. Some of these bands may move repeatedly across the same locations, increasing the potential for flash flooding. Because of the uncertainty in where these bands will set up today and the region's sensitivity to additional rainfall, the Flash Flood Watch has been extended through this evening. Should the threat for heavy rainfall shift west of the region, the Flash Flood Watch may be cancelled early. TXZ183>189-202>205-217>220-228-170000- /O.EXT.KEWX.FF.A.0005.000000T0000Z-180917T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Val Verde-Edwards-Real-Kerr-Bandera-Gillespie-Kendall-Kinney- Uvalde-Medina-Bexar-Maverick-Zavala-Frio-Atascosa-Dimmit- Including the cities of Del Rio, Rocksprings, Leakey, Kerrville, Bandera, Fredericksburg, Boerne, Bracketville, Uvalde, Hondo, San Antonio, Eagle Pass, Crystal City, Pearsall, Pleasanton, and Carrizo Springs 327 AM CDT Sun Sep 16 2018 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH THIS EVENING... The Flash Flood Watch is now in effect for * A portion of south central Texas, including the following areas, Atascosa, Bandera, Bexar, Dimmit, Edwards, Frio, Gillespie, Kendall, Kerr, Kinney, Maverick, Medina, Real, Uvalde, Val Verde, and Zavala. * Through this evening * Scattered to numerous showers with embedded thunderstorms will impact the watch area today. Widespread 1 to 2 inches of rainfall are expected through today, with isolated pockets near 4 inches possible. Due to sensitivity of nearly-saturated grounds in the watch area, any additional heavy rains will result in quick run-off and an increased risk for flash flooding. * Flooding of low water crossings, underpasses, and urban areas are possible. If you encounter a flooded roadway, Turn Around, Don't Drown! PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
646 WGUS64 KEWX 161950 FFAEWX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Austin/San Antonio TX 250 PM CDT Sun Sep 16 2018 ...PERIODS OF HEAVY RAINFALL LEADING TO LOCALIZED FLASH FLOODING POSSIBLE TODAY... .A low pressure system located just west of Del Rio this afternoon will continue to produce showers and embedded thunderstorms through this evening, while a line of thunderstorms moves from south to north across most of the area late this afternoon. Additional rainfall of 1/2 to 1 inch will be common, with a few spots receiving up to three additional inches of rain. The flash flood threat should be over by 7 pm CDT, although minor flooding may occur or continue into late evening. TXZ206-207-221-222-170000- /O.NEW.KEWX.FF.A.0006.180916T1950Z-180917T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Comal-Guadalupe-Wilson-Karnes- Including the cities of New Braunfels, Seguin, Floresville, and Karnes City 250 PM CDT Sun Sep 16 2018 ...FLASH FLOOD WATCH IN EFFECT UNTIL 7 PM CDT THIS EVENING... The National Weather Service in Austin/San Antonio has issued a * Flash Flood Watch for a portion of south central Texas, including the following areas, Comal, Guadalupe, Karnes, and Wilson. * Until 7 PM CDT this evening * Two to four inches of rain has fallen in the last 36 hours, and another 1/2 to 2 inches is possible through sunset. * Minor flooding is likely, and more significant flooding may occur where rainfall is more intense. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ TXZ183>189-202>205-217>220-228-170000- /O.CON.KEWX.FF.A.0005.000000T0000Z-180917T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Val Verde-Edwards-Real-Kerr-Bandera-Gillespie-Kendall-Kinney- Uvalde-Medina-Bexar-Maverick-Zavala-Frio-Atascosa-Dimmit- Including the cities of Del Rio, Rocksprings, Leakey, Kerrville, Bandera, Fredericksburg, Boerne, Bracketville, Uvalde, Hondo, San Antonio, Eagle Pass, Crystal City, Pearsall, Pleasanton, and Carrizo Springs 250 PM CDT Sun Sep 16 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... The Flash Flood Watch continues for * A portion of south central Texas, including the following areas, Atascosa, Bandera, Bexar, Dimmit, Edwards, Frio, Gillespie, Kendall, Kerr, Kinney, Maverick, Medina, Real, Uvalde, Val Verde, and Zavala. * Until 7 PM CDT this evening * Scattered to numerous showers with embedded thunderstorms will impact the watch area through early evening. Widespread 1 to 2 inches of rainfall are expected, and a few spots could receive up to 3 inches of rain by sunset. * Flooding of low water crossings, underpasses, and urban areas are possible. If you encounter a flooded roadway, Turn Around, Don't Drown! PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
531 WGUS64 KEWX 170020 FFAEWX Flood Watch National Weather Service Austin/San Antonio TX 720 PM CDT Sun Sep 16 2018 TXZ183>189-202>205-217>220-228-170130- /O.EXP.KEWX.FF.A.0005.000000T0000Z-180917T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Val Verde-Edwards-Real-Kerr-Bandera-Gillespie-Kendall-Kinney- Uvalde-Medina-Bexar-Maverick-Zavala-Frio-Atascosa-Dimmit- Including the cities of Del Rio, Rocksprings, Leakey, Kerrville, Bandera, Fredericksburg, Boerne, Bracketville, Uvalde, Hondo, San Antonio, Eagle Pass, Crystal City, Pearsall, Pleasanton, and Carrizo Springs 720 PM CDT Sun Sep 16 2018 ...FLASH FLOOD WATCH HAS EXPIRED... The Flash Flood Watch for a portion of south central Texas has expired. Overall, the threat for flash flooding has lowered and the watch will be allowed to expire. $$ TXZ206-207-221-222-170130- /O.EXP.KEWX.FF.A.0006.000000T0000Z-180917T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Comal-Guadalupe-Wilson-Karnes- Including the cities of New Braunfels, Seguin, Floresville, and Karnes City 720 PM CDT Sun Sep 16 2018 ...FLASH FLOOD WATCH HAS EXPIRED... The Flash Flood Watch for a portion of south central Texas has expired. Overall, the threat for flash flooding has lowered and the watch will be allowed to expire. $$
What forecasters said that day
The local office's own words before this flash flood watch 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 flash flood watch went out at Sep 13, 1:01 PM CDT, 1 hour 42 minutes earlier.
Area forecast discussion, Sep 13, 1:01 PM CDT, 1 hour 42 minutes before
Area Forecast Discussion National Weather Service Austin/San Antonio TX 101 PM CDT Thu Sep 13 2018 .AVIATION... Ceilings are continuing to break early this afternoon and VFR conditions should break out at all terminals within the next hour or so. While there will be decent coverage of cloudcover through the afternoon skies should be VFR through the evening. Isolated showers have already developed east of I-35 and these should move into the I-35 corridor later this afternoon potentially impacting the terminals (AUS/SAT/SSF). Because of this VCSH and -SHRA have been added to the I-35 sites through the afternoon and evening. Cigs will return along I-35 between 04z and 06z and continue to drop to IFR between 09z and 11z. MVFR cigs will develop at DRT around 09z and last through 16z on Friday. Improvement in ceilings tomorrow along I-35 will be slow, but MVFR should return by mid morning with another round of scattered showers expected through the day. && .PREV DISCUSSION... /ISSUED 619 AM CDT Thu Sep 13 2018/ AVIATION... MVFR/IFR ceilings are in place across all TAF sites this morning and should prevail through the late morning hours before VFR returns this afternoon. There are some very isolated showers to the southeast of KSAT but these are not worth mentioning. More robust showers are expected this afternoon and will mention VCSH with TEMPO groups for SHRA. Will keep the overnight period rain free as most of the high res guidance shows things rain free with the loss of heating. Another round of MVFR and perhaps IFR conditions can be expected tonight. PREV DISCUSSION... /ISSUED 425 AM CDT Thu Sep 13 2018/ NEAR TERM (Today into Tonight)... Expect today will be similar to yesterday. The deepest moisture with PWs around 2 inches remains along and east of I-35 keeping greatest coverage of showers and thunderstorms over those areas. Locally heavy rains and minor flooding are possible. SHORT TERM (Friday through Sunday)... The tropical disturbance that has been drifting west across the Gulf of Mexico moves across central and southern Texas on Friday into Saturday, then into Mexico by Sunday. Models have been trending toward the GFS in keeping it more of an open wave. Currently, the National Hurricane Center indicates a 60% chance of tropical cyclone development. Regardless of development, the main impact will be increased heavy rains causing a threat of flash flooding and renewed river flooding. Moisture levels increase as PWs rise to 2.0 to 2.5 inches. Showers and thunderstorms become more numerous to widespread with a corresponding greater coverage of heavy rains most areas Friday into Saturday, shifting to the Rio Grande and Edwards Plateau Saturday night into Sunday. Should the system become a tropical cyclone, then the heaviest rains will become more focused in bands and near the center. There remains uncertainty on where this center would move across in those few models that still show a closed center. Model consensus shows the highest rainfall amounts from San Antonio metro area to the south and west, however a few models show a few spots elsewhere. Current indications show rainfall totals of 2 to 4 inches with isolated totals of up to 8 inches. Due to the saturated soils from the heavy rains thus far in September, the threat for flash flooding and renewed river flooding increases as runoff will be more rapid. Expect a Flash Flood Watch will be issued for Friday into Saturday for at least part of our area as models come more into a consensus. Key Messages: 1) Regardless of tropical cyclone development, the main impact from this system will be periods of heavy rain and potential flooding across South Central Texas Friday through Sunday. 2) Flash Flooding of low water crossings and urban areas possible. Turn Around, Don't Drown! 3) Heavy rainfall and flooding will be of greatest concern from the San Antonio metro area to the south and west. 4) Flooding possible on Rio Grande, Nueces, Frio, and San Antonio River systems. LONG TERM (Monday through Wednesday)... In the wake of the tropical disturbance, the Subtropical Ridge builds toward our area. Showers and thunderstorms become more isolated and driven by heating as the airmass dries with increasing subsidence. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 88 73 85 73 85 / 60 40 70 50 60 Austin Bergstrom Intl Airport 88 73 85 73 85 / 70 40 70 50 60 New Braunfels Muni Airport 88 73 85 73 85 / 70 40 70 60 70 Burnet Muni Airport 86 71 83 71 82 / 50 30 70 50 60 Del Rio Intl Airport 89 73 88 73 83 / 30 20 50 60 80 Georgetown Muni Airport 88 72 85 72 84 / 60 30 70 50 60 Hondo Muni Airport 88 73 86 72 83 / 60 40 70 60 80 San Marcos Muni Airport 88 73 85 73 85 / 70 40 70 50 70 La Grange - Fayette Regional 89 74 86 74 87 / 80 50 80 50 70 San Antonio Intl Airport 88 73 85 73 84 / 60 40 70 60 80 Stinson Muni Airport 89 74 86 74 85 / 60 40 70 60 80 && .EWX WATCHES/WARNINGS/ADVISORIES... None. && Mesoscale/Aviation...Treadway Synoptic/Grids...Runyen Public Service/Data Collection...33
Hazardous weather outlook, Sep 13, 3:24 AM CDT, 11 hours 19 minutes before
Hazardous Weather Outlook National Weather Service Austin/San Antonio TX 324 AM CDT Thu Sep 13 2018 TXZ171>173-183>194-202>209-217>225-228-141200- 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- 324 AM CDT Thu Sep 13 2018 This Hazardous Weather Outlook is for South-Central Texas.. .DAY ONE...Today And Tonight. Showers and thunderstorms are expected today into tonight. Locally heavy rains are possible and may cause mainly minor flooding. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. Showers and thunderstorms are expected Friday through Monday. Heavy rains become more widespread Friday into Saturday resulting in a greater threat for flash flooding and possibly renewed river flooding. Rainfall amounts of 2 to 4 inches will be possible with isolated totals up to 8 inches. Due to recent rains and the saturated ground even a quick 1 inch of rainfall could lead to flash flooding issues in some areas. The area of greatest concern for the heavy rainfall and potential flash flooding will be across the Rio Grande, western Hill Country and San Antonio metro areas. Chances and coverage of rainfall will begin to decrease during the first part of next week. .SPOTTER INFORMATION STATEMENT... While spotter activation is not anticipated, any reports of heavy rainfall or flooding are appreciated.
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Flash Flood Watches in Texas, 2018Every flash flood watch in 2018
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.