Alert archive / Texas / Flash Flood Watches in 2015

Flash Flood Watch 7, NWS Brownsville, TX

May 21, 20155 counties in Texas

NWS Brownsville, TX issued this flash flood watch at May 21, 2015, 3:54 AM CDT for 5 counties in Texas. It took effect at May 21, 2015, 8:01 AM CDT. It was in force for 28 hr.

The area

The counties it named.

The facts

Issued: May 21, 2015, 3:54 AM CDT (08:54 UTC)
In effect from: May 21, 2015, 8:01 AM CDT
Expired: May 22, 2015, 11:36 AM CDT
In force: 28 hr
Issued by: NWS Brownsville, TX
Flood severity: None

Counties Brooks County, TX, Hidalgo County, TX, Jim Hogg County, TX, Starr County, TX, Zapata County, TX

The radar

The Corpus Christi radar (KCRP), 153 km from the middle of the area, began a volume at 08:55 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 00:00Z, 8.9 hours before the alert went out and 360 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: 1721 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1071 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

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 Brownsville, TX wrote its last area forecast discussion before this flash flood watch went out at May 21, 12:59 AM CDT, 2 hours 55 minutes earlier.

Area forecast discussion, May 21, 12:59 AM CDT, 2 hours 55 minutes before

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Hazardous weather outlook, May 20, 4:31 PM CDT, 11 hours 23 minutes before

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The office that day

Everything else NWS Brownsville, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 21, 7:24 AM CDT	Special Weather Statement	BRO	Zapata	66 min
May 21, 7:32 AM CDT	Severe Thunderstorm Warning	BRO	Zapata	58 min
May 21, 8:30 AM CDT	Severe Thunderstorm Warning	BRO	Zapata	60 min
May 21, 8:47 AM CDT	Flash Flood Warning	BRO	Zapata	118 min
May 21, 8:58 AM CDT	Special Weather Statement	BRO	Jim Hogg	62 min
May 21, 9:12 AM CDT	Special Weather Statement	BRO	Starr	63 min
May 21, 9:53 AM CDT	Areal Flood Advisory	BRO	Jim Hogg	112 min
May 21, 10:11 AM CDT	Flash Flood Warning	BRO	Starr	3 hr
May 21, 10:27 AM CDT	Special Weather Statement	BRO	Hidalgo, Starr	78 min
May 21, 10:30 AM CDT	Severe Thunderstorm Warning	BRO	Starr	44 min
May 21, 12:12 PM CDT	Special Weather Statement	BRO	Cameron	93 min
May 21, 12:25 PM CDT	Areal Flood Advisory	BRO	Cameron	110 min
May 21, 12:49 PM CDT	Flash Flood Warning	BRO	Cameron	116 min
May 21, 1:20 PM CDT	Areal Flood Advisory	BRO	Cameron	115 min

Nearby

Flash Flood Watches in Texas, 2015 Every flash flood watch in 2015

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.