Alert archive / Texas / Flash Flood Watches in 2017

Flash Flood Watch 6, NWS Houston/Galveston, TX

June 5, 2017Brazoria County, Chambers County, Galveston County, Texas

NWS Houston/Galveston, TX issued this flash flood watch at Jun 5, 2017, 4:12 AM CDT for Brazoria County, Chambers County, Galveston County, Texas. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Jun 5, 2017, 4:12 AM CDT (09:12 UTC)
Expired
Jun 5, 2017, 9:03 AM CDT
In force
5 hr
Issued by
NWS Houston/Galveston, TX
Flood severity
None

Counties Brazoria County, TX, Chambers County, TX, Galveston County, TX

The radar

The Houston radar (KHGX), 14 km from the middle of the area, began a volume at 09:15 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

Corpus Christi, TX (KCRP), launched 00:00Z, 9.2 hours before the alert went out and 296 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-pSkew-T log-p diagram, Corpus Christi, TX at 00:00Z on 2017-06-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1657 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Corpus Christi, TX at 00:00Z on 2017-06-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1657 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
1219 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.5

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 Houston/Galveston, TX wrote its last area forecast discussion before this flash flood watch went out at Jun 4, 6:43 PM CDT, 9 hours 29 minutes earlier.

Area forecast discussion, Jun 4, 6:43 PM CDT, 9 hours 29 minutes before
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Hazardous weather outlook, Jun 4, 5:13 AM CDT, 22 hours 59 minutes before
Hazardous Weather Outlook
National Weather Service Houston/Galveston TX
513 AM CDT Sun Jun 4 2017

TXZ163-164-176>179-195>200-210>214-226-227-235>238-051015-
Austin-Brazoria-Brazos-Burleson-Chambers-Colorado-Fort Bend-
Galveston-Grimes-Harris-Houston-Jackson-Liberty-Madison-Matagorda-
Montgomery-Polk-San Jacinto-Trinity-Walker-Waller-Washington-
Wharton-
513 AM CDT Sun Jun 4 2017

This hazardous weather outlook is for portions of Southeast Texas..

.DAY ONE...Today and Tonight

A slow moving upper level disturbance will bring periods of
showers and thunderstorms to the region today. Some of the rain
will be locally heavy and minor flooding will be possible. Some of
the stronger storms could produce a brief funnel cloud, frequent
cloud to ground lightning and wind gusts around 35 mph.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

An upper level disturbance will bring scattered showers and
thunderstorms to the region. Some of the storms could again
produce locally heavy rain and minor flooding. The stronger storms
could again produce brief gusty winds.

A chance of thunderstorms will linger on Tuesday with again the
stronger storms capable of producing gusty winds.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

GMZ330-335-350-355-370-375-051015-
Coastal waters from Freeport to the Matagorda Ship Channel out
20 NM-Coastal waters from High Island to Freeport out 20 NM-
Galveston Bay-Matagorda Bay-
Waters from Freeport to the Matagorda Ship Channel from 20 to
60 NM-Waters from High Island to Freeport from 20 to 60 NM-
513 AM CDT Sun Jun 4 2017

This hazardous weather outlook is for portions of Southeast Texas..

.DAY ONE...Today and Tonight

Swells propagating into the coastal waters will produce wave
heights near or just above 5 feet in the offshore waters.
Mariners should prepare for locally rough seas due to the swells
and also from thunderstorms producing variable and gusty winds and
frequent lightning.

Waterspouts may be possible this morning.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 4, 7:01 PM CDTAreal Flood AdvisoryHGXChambers, Galveston119 min
Jun 4, 7:37 PM CDTSpecial Weather StatementHGXJackson38 min
Jun 5, 3:43 AM CDTSpecial Marine WarningHGX47 min
Jun 5, 4:34 AM CDTSpecial Marine WarningHGX41 min
Jun 5, 4:43 AM CDTAreal Flood AdvisoryHGXBrazoria, Galveston62 min
Jun 5, 5:54 AM CDTAreal Flood AdvisoryHGXChambers, Galveston66 min
Jun 5, 6:05 AM CDTSpecial Marine WarningHGX55 min
Jun 5, 6:42 AM CDTSpecial Marine WarningHGX63 min
Jun 5, 7:11 AM CDTAreal Flood AdvisoryHGXJackson, Matagorda64 min
Jun 5, 7:14 AM CDTAreal Flood AdvisoryHGXChambers, Harris61 min
Jun 5, 7:51 AM CDTSpecial Marine WarningHGX39 min
Jun 5, 12:14 PM CDTAreal Flood AdvisoryHGXAustin, Fort Bend, Waller, Wharton61 min
Jun 5, 12:59 PM CDTAreal Flood AdvisoryHGXAustin, Fort Bend, Harris, Waller2 hr
Jun 5, 2:24 PM CDTSpecial Weather StatementHGXColorado51 min

Nearby

Flash Flood Watches in Texas, 2017Every flash flood watch in 2017

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.