Alert archive / Texas / Flash Flood Watches in 2015

Flash Flood Watch 11, NWS Brownsville, TX

September 11, 20154 counties in Texas

NWS Brownsville, TX issued this flash flood watch at Sep 11, 2015, 11:47 AM CDT for 4 counties in Texas. It took effect at Sep 11, 2015, 1:00 PM CDT. It was in force for 13 hr.

The area

The counties it named.

The facts

Issued
Sep 11, 2015, 11:47 AM CDT (16:47 UTC)
In effect from
Sep 11, 2015, 1:00 PM CDT
Expired
Sep 12, 2015, 2:00 AM CDT
In force
13 hr
Issued by
NWS Brownsville, TX
Flood severity
None

Counties Cameron County, TX, Hidalgo County, TX, Starr County, TX, Willacy County, TX

The radar

The Brownsville radar (KBRO), 78 km from the middle of the area, began a volume at 16:49 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

Brownsville Intl, TX (KBRO), launched 12:00Z, 4.8 hours before the alert went out and 81 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, Brownsville Intl, TX at 12:00Z on 2015-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3607 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, Brownsville Intl, TX at 12:00Z on 2015-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -19 square meters per square second.1939Sfc1 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
3607 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
581 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-19 m²/s²
0-3 km storm-relative helicity
18 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Sep 11, 6:28 AM CDT, 5 hours 19 minutes earlier.

Area forecast discussion, Sep 11, 6:28 AM CDT, 5 hours 19 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Hazardous weather outlook, Sep 11, 3:25 AM CDT, 8 hours 22 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BROWNSVILLE TX
325 AM CDT FRI SEP 11 2015

TXZ248>257-121100-
ZAPATA-JIM HOGG-BROOKS-KENEDY-STARR-HIDALGO-INLAND WILLACY-
INLAND CAMERON-COASTAL WILLACY-COASTAL CAMERON-
325 AM CDT FRI SEP 11 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF DEEP SOUTH
TEXAS.

.DAY ONE...TODAY AND TONIGHT

SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WITH LOCALLY
HEAVY RAINFALL ARE FORECAST. ANY OF THE HEAVIER...SLOWER-
MOVING...OR PERSISTENT SHOWERS AND THUNDERSTORMS WILL HAVE THE
ABILITY TO PRODUCE NUISANCE FLOODING IN LOW-LYING AND POORLY-
DRAINING AREAS...AND FLASH FLOODING IN AREAS WITH ELEVATION...
ESPECIALLY WITHIN ZAPATA...JIM HOGG...AND STARR COUNTIES.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NUMEROUS SHOWERS AND THUNDERSTORMS WITH LOCALLY HEAVY RAINFALL
ARE FORECAST FOR SATURDAY. ANY OF THE HEAVIER...SLOWER-MOVING
...OR PERSISTENT SHOWERS AND THUNDERSTORMS WILL HAVE THE ABILITY
TO PRODUCE NUISANCE FLOODING IN LOW-LYING AND POORLY-DRAINING
AREAS...AND FLASH FLOODING IN AREAS WITH ELEVATION...ESPECIALLY
WITHIN ZAPATA...JIM HOGG...AND STARR COUNTIES.

.SPOTTER INFORMATION STATEMENT...

ANY OBSERVATIONS OF NUISANCE OR FLASH FLOODING FRIDAY THROUGH
SATURDAY SHOULD BE REPORTED TO LOCAL LAW ENFORCEMENT OR THE
NATIONAL WEATHER SERVICE OFFICE IN BROWNSVILLE.

GMZ130-132-135-150-155-170-175-121100-
LAGUNA MADRE FROM THE PORT OF BROWNSVILLE TO THE ARROYO COLORADO-
LAGUNA MADRE FROM THE ARROYO COLORADO TO 5 NM NORTH OF PORT
MANSFIELD TX-
LAGUNA MADRE FROM 5 NM NORTH OF PORT MANSFIELD TO BAFFIN BAY TX-
COASTAL WATERS FROM PORT MANSFIELD TO THE RIO GRANDE OUT 20 NM-
COASTAL WATERS FROM BAFFIN BAY TO PORT MANSFIELD OUT 20 NM-
WATERS FROM PORT MANSFIELD TO THE RIO GRANDE EXTENDING FROM 20 TO
60 NM-
WATERS FROM BAFFIN BAY TO PORT MANSFIELD EXTENDING FROM 20 TO
60 NM-
325 AM CDT FRI SEP 11 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE GULF OF
MEXICO AND THE LAGUNA MADRE.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION WILL NOT BE NEEDED.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 10, 7:01 PM CDTSpecial Weather StatementBROJim Hogg44 min
Sep 10, 7:26 PM CDTAreal Flood AdvisoryBROBrooks, Jim Hogg94 min
Sep 10, 7:35 PM CDTSpecial Weather StatementBROJim Hogg25 min
Sep 10, 8:40 PM CDTSpecial Weather StatementBROJim Hogg50 min
Sep 10, 9:45 PM CDTSpecial Weather StatementBROStarr45 min
Sep 10, 9:56 PM CDTAreal Flood AdvisoryBROStarr, Zapata94 min
Sep 11, 3:57 PM CDTSpecial Weather StatementBROBrooks93 min
Sep 11, 4:13 PM CDTSpecial Marine WarningBRO2 hr
Sep 11, 4:33 PM CDTAreal Flood AdvisoryBROKenedy117 min
Sep 11, 4:47 PM CDTSpecial Weather StatementBROHidalgo43 min
Sep 11, 5:03 PM CDTSpecial Weather StatementBROKenedy57 min
Sep 11, 5:12 PM CDTSpecial Weather StatementBROWillacy48 min
Sep 11, 5:18 PM CDTAreal Flood AdvisoryBROCameron, Hidalgo87 min
Sep 11, 5:23 PM CDTSevere Thunderstorm WarningBROWillacy52 min
Sep 11, 5:29 PM CDTAreal Flood AdvisoryBROWillacy2 hr
Sep 11, 5:37 PM CDTTornado WarningBROWillacy23 min
Sep 11, 5:46 PM CDTSpecial Weather StatementBROHidalgo59 min
Sep 11, 5:54 PM CDTSpecial Marine WarningBRO2 hr
Sep 11, 5:59 PM CDTAreal Flood AdvisoryBROKenedy, Willacy2 hr
Sep 11, 6:15 PM CDTSpecial Weather StatementBROHidalgo60 min
Sep 11, 6:25 PM CDTSpecial Weather StatementBROHidalgo, Willacy50 min
Sep 11, 6:33 PM CDTSpecial Weather StatementBROHidalgo57 min
Sep 11, 6:48 PM CDTSpecial Marine WarningBRO117 min
Sep 11, 6:53 PM CDTAreal Flood AdvisoryBROCameron, Hidalgo, Willacy112 min

Nearby

Flash Flood Watches in Texas, 2015Every 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.