Alert archive / Texas / Flash Flood Warnings in 2018

Flash Flood Warning 39, NWS Austin/San Antonio, TX

September 22, 2018Bandera County, Medina County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Sep 22, 2018, 2:14 AM CDT for Bandera County, Medina County, Texas. It was in force for 3 hr. 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: Sep 22, 2018, 2:14 AM CDT (07:14 UTC)
Expired: Sep 22, 2018, 5:15 AM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Flood severity: None

Counties Bandera County, TX, Medina County, TX

The radar

The Austin/San Antonio radar (KEWX), 92 km from the middle of the area, began a volume at 07:14 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
Sep 22, 3:31 AM CDT	FLASH FLOOD	2 Ne Lakehills, TX	LAW ENFORCEMENT INDICATED THAT PARK ROAD 37 WAS CLOSED DUE TO HIGH WATER IN A FEW LOCATIONS.

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

The nearest sounding before it

Del Rio, TX (KDLF), launched 00:00Z, 7.2 hours before the alert went out and 183 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: 472 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 1293 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 43 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

988 
WGUS54 KEWX 220714
FFWEWX
TXC019-325-221015-
/O.NEW.KEWX.FF.W.0039.180922T0714Z-180922T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
214 AM CDT SAT SEP 22 2018

The National Weather Service in Austin San Antonio has issued a

* Flash Flood Warning for...
  Northeastern Medina County in south central Texas...
  Southeastern Bandera County in south central Texas...

* Until 515 AM CDT

* At 213 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. 2 to 3 inches of rainfall is 
  possible with isolated pockets in excess of 4 inches. Flash 
  flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Bandera, Lakehills, Cliff, Pipe Creek, Bandera Falls, Kronkosky
  State Natural Area, Quihi, Hill Country State Natural Area, Mico,
  Rio Medina, Government Canyon State Natural Area and Lake Medina
  Shores.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.

&&

LAT...LON 2963 9919 2982 9901 2972 9878 2969 9881
      2943 9880 2939 9881 2939 9918

$$

RUNYEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 21, 7:04 PM CDT	Special Weather Statement	EWX	Lee	41 min
Sep 21, 9:39 PM CDT	Special Weather Statement	EWX	Lee	51 min
Sep 21, 10:04 PM CDT	Areal Flood Advisory	EWX	Lee	116 min
Sep 21, 10:50 PM CDT	Areal Flood Advisory	EWX	Lee, Travis, Williamson	3 hr
Sep 21, 11:24 PM CDT	Special Weather Statement	EWX	Williamson	51 min
Sep 21, 11:37 PM CDT	Flash Flood Warning	EWX	Williamson	5 hr
Sep 22, 12:00 AM CDT	Areal Flood Advisory	EWX	Bandera, Kendall, Kerr	3 hr
Sep 22, 12:28 AM CDT	Flash Flood Warning	EWX	Bandera	3 hr
Sep 22, 1:01 AM CDT	Flash Flood Warning	EWX	Burnet, Travis, Williamson	6 hr
Sep 22, 1:29 AM CDT	Areal Flood Advisory	EWX	Uvalde	3 hr
Sep 22, 1:41 AM CDT	Areal Flood Advisory	EWX	Medina	3 hr
Sep 22, 1:53 AM CDT	Special Weather Statement	EWX	Williamson	37 min
Sep 22, 2:45 AM CDT	River Flood Warning	EWX	Williamson	11 hr
Sep 22, 3:02 AM CDT	Flash Flood Warning	EWX	Bexar	3 hr
Sep 22, 3:12 AM CDT	Flash Flood Warning	EWX	Medina	3 hr
Sep 22, 3:28 AM CDT	Special Weather Statement	EWX	Medina	32 min
Sep 22, 4:05 AM CDT	Areal Flood Advisory	EWX	Atascosa, Frio	3 hr
Sep 22, 4:24 AM CDT	Flash Flood Warning	EWX	Bexar	3 hr
Sep 22, 4:28 AM CDT	Flash Flood Warning	EWX	Williamson	2 hr
Sep 22, 4:33 AM CDT	Areal Flood Advisory	EWX	Comal, Hays	3 hr
Sep 22, 5:11 AM CDT	River Flood Warning	EWX	Bandera	4 hr
Sep 22, 5:22 AM CDT	Areal Flood Advisory	EWX	Travis, Williamson	113 min
Sep 22, 6:04 AM CDT	Flash Flood Warning	EWX	Travis, Williamson	3 hr
Sep 22, 6:21 AM CDT	River Flood Warning	EWX	Bexar	9 hr
Sep 22, 6:37 AM CDT	Areal Flood Advisory	EWX	Bandera, Bexar, Medina	113 min
Sep 22, 8:48 AM CDT	River Flood Warning	EWX	Bexar	36 hr
Sep 22, 8:48 AM CDT	River Flood Warning	EWX	Medina	26 hr
Sep 22, 8:48 AM CDT	River Flood Warning	EWX	Bexar	55 hr
Sep 22, 9:05 AM CDT	River Flood Warning	EWX	Frio	3 days
Sep 22, 9:16 AM CDT	Areal Flood Advisory	EWX	Williamson	3 hr
Sep 22, 2:30 PM CDT	River Flood Warning	EWX	Val Verde	22 hr
Sep 22, 2:35 PM CDT	River Flood Warning	EWX	Bexar, Wilson	24 hr
Sep 22, 6:59 PM CDT	River Flood Warning	EWX	Val Verde	22 hr

Nearby

Flash Flood Warnings in Texas, 2018 Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.