An intense line of bowing convection developed ahead of a cold front moved southeast across the ranchlands and Rio Grande Valley, bring heavy rainfall, and gusty winds.
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The episode as NWS BRO wrote it up.
An intense line of bowing convection developed ahead of a cold front moved southeast across the ranchlands and Rio Grande Valley, bring heavy rainfall, and gusty winds.
The local office's own words before the first event, 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 the first event at May 28, 9:22 AM CST, 1 hour 53 minutes earlier.
Area Forecast Discussion...UPDATED National Weather Service Brownsville TX 1022 AM CDT Sun May 28 2017 .DISCUSSION...A few minor cloud cover and temperature adjustments this morning...mainly to cover trends. Also populated latest dew points which overall start off a few degree higher and show a slower downward trend this afternoon with a brisk southerly flow. Multilevel cloudiness across the west this morning are expected to thin through the day as weak subsidence develops in advance of the cold front moving through Central Texas. This should keep temperatures on track but dewpoints might have a tough time lowering into the upper 60s. Over the east temperatures have risen a few degrees quicker this morning despite the morning cumulus field. The cu are expected to break up by late morning as slightly drier air in the mid layers mixes into the boundary layer. Partly cloudy skies this afternoon should suffice. With the slightly higher temperatures in the east (Lower Valley) and slower decrease of dewpoints heat indices reach 110-112 for 1 to 3 hours along and south of Interstate 2 and across portions of the Lower RGV. Will continue to monitor trends and may have to issue a Heat advisory if dew points do not decrease faster then expected. If a heat advisory is issued it will include the entire RGV from Starr to Willacy/Cameron. && .PREV DISCUSSION... /issued 617 AM CDT Sun May 28 2017/ DISCUSSION...Updated for latest aviation discussion below. AVIATION...A mix of MVFR and VFR ceilings covers local terminals this morning. Expect periods of MVFR ceilings through mid-morning as patches of lower clouds move through. Ceilings will improve to VFR by late morning. Southeasterly winds will pick up by mid- morning and become gusty, but shouldn't be quite as strong today as they were yesterday, due to a slightly weaker pressure gradient. Generally rain free conditions expected through the afternoon and evening hours, but rain chances return overnight as a cold front pushes south across Texas. Added mention of VCTS to end of package at all TAF sites. PREV DISCUSSION... /issued 429 AM CDT Sun May 28 2017/ SHORT TERM (Now through Monday): Little change from yesterday expected during the day today as 500 mb ridging over the Gulf of Mexico shifts northeast through the day. The next cold front pushing across Texas will make decent headway today, making it into central Texas, but likely not making it as far south as the ranchlands. Surface high pressure over the Gulf will maintain moderate southeasterly flow across the region, keeping dewpoints high. Highs today will be a degree or two cooler than yesterday as the 500 mb ridge shifts northeastward, but nonetheless still hot, with temperatures in the mid 90s east to around the century mark out west. The combination of the heat and high dewpoints will result in heat index values of 105 to 110 this afternoon across the Rio Grande Valley. At this time, it appears that Heat Advisory criteria will not be met, but it will still feel plenty uncomfortable. Unsettled weather pattern begins Sunday night as the front pushes further southward, with showers and thunderstorms developing ahead of the front along outflow boundaries. Some of these storms could become strong to severe across the western and northern zones, with strong winds and large hail possible. SPC has included this area in a marginal risk in the Day 1 Convective Outlook. Moving into Monday, rain chances increase greatly, as the proximity of the front, combines with abundant moisture, and passing shortwaves. Model guidance continues to show a wet day Monday, with differences remaining in timing of convective activity and location of QPF maxima. All signals point to a heavy rainfall event. WPC QPF totals for Days 1-2 show upwards of 3 inches painted across the ranchlands and the region remains in a Marginal Risk of excessive rainfall for Monday. Flash flood guidance remains on the high side, with widespread flooding not anticipated at this time. While the main threat Monday remains heavy rainfall, a few storms could become strong to severe Monday, with strong winds and large hail possible. SPC has the entire CWA under a Marginal Risk in the Day 2 Convective Outlook. LONG TERM (Monday Night through Saturday): The unsettled weather pattern continues through most of the long term period. A weak cold front is expected to stall across or just north of the region through the first half of the forecast period. Abundant moisture (precipitable water values around 2 inches) combined with a series of upper level disturbances and the stalled frontal boundary should support at least a chance of showers and thunderstorms each day. Temperatures are likely to be close to near normal levels given the expected cloud coverage and opportunity for rainfall through the end of the week. Above normal temperatures may return for next weekend as rain chances begin to diminish. MARINE (Now through Monday): Conditions at Buoy 42020 at 2 am show south winds at around 17 knots and seas around 5 feet. Pressure gradient will continue to relax moving into Sunday night as a front pushes south across Texas. Moderate south to southeast winds expected to prevail along with moderate seas through Monday morning. Winds become more easterly to northeasterly Monday afternoon as the front moves closer. Showers and thunderstorms possible Sunday night through Monday with the approach of the front and passing upper level shortwaves. Monday Night through Thursday Night...A weak pressure gradient across the western Gulf will support light to moderate east to southeast winds and low to moderate seas Monday night into Tuesday. The pressure gradient will begin to strengthen mid to late in the week with marginal small craft advisory conditions developing Wednesday night into Thursday due to building seas. && .PRELIMINARY POINT TEMPS/POPS... BAYVIEW/PORT ISABEL 93 80 87 76 / 0 30 50 70 BROWNSVILLE 96 80 89 75 / 0 30 50 60 HARLINGEN 98 78 89 73 / 0 30 60 60 MCALLEN 100 79 90 74 / 0 40 60 70 RIO GRANDE CITY 101 78 89 73 / 10 40 70 70 SOUTH PADRE ISLAND 86 80 81 78 / 0 30 50 70 && .BRO WATCHES/WARNINGS/ADVISORIES... TX...None. GM...None. && This product is also available on the web at: HTTP://WEATHER.GOV/RGV 59...SHORT TERM 61...LONG TERM
Hazardous Weather Outlook National Weather Service Brownsville TX 413 AM CDT Sun May 28 2017 TXZ248>257-290915- Zapata-Jim Hogg-Brooks-Kenedy-Starr-Hidalgo-Inland Willacy- Inland Cameron-Coastal Willacy-Coastal Cameron- 413 AM CDT Sun May 28 2017 This Hazardous Weather Outlook is for portions of Deep South Texas. .DAY ONE...Today and Tonight Heat indices will reach 105 to 110 for a few hours this afternoon. Scattered showers and thunderstorms tonight may produce locally heavy rainfall that could cause periods of nuisance flooding of streets and low-lying areas. There is a marginal risk of severe thunderstorms across the northern and western ranchlands tonight. Isolated storms may become strong enough to produce large hail and gusty winds near 60 mph. .DAYS TWO THROUGH SEVEN...Monday through Saturday There is a marginal risk of severe thunderstorms across all of the Rio Grande Valley and Deep South Texas Monday. Isolated storms may become strong enough to produce large hail and gusty winds near 60 mph. Scattered to numerous showers and thunderstorms may produce locally heavy rainfall that could cause periods of nuisance flooding of streets and low-lying areas through Thursday. There is an elevated risk of rip currents Wednesday night through Thursday and once again Friday night into Saturday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated at this time. GMZ130-132-135-150-155-170-175-290915- 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- 413 AM CDT Sun May 28 2017 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...Monday through Saturday A few strong thunderstorms are possible across the lower Texas coastal waters Monday. Gusty winds, frequent lightning, and higher seas will accompany the stronger storms. Small craft advisories may be needed Wednesday night into Thursday for the Gulf waters due to building seas. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated at this time.
The Corpus Christi radar (KCRP), 128 km away, was scanning. The volume nearest the first event began at 17:11 UTC.
3 heavy rain, 2 flash flood, 1 thunderstorm wind. Local standard time, as filed.
Jim Hogg County Sheriff's Office reported flooding on West Galbraith and at the intersection of Viggie and Hinjosa. Radar estimated 2.0 to 2.5 inches of rainfall.
Zapata County Sheriff's Office reported water on the outside lanes of Highway 16, as well as at the intersection of 1st and Carla in the city of Zapata. Radar estimated 1.5 to 2.5 inches of rain.
Roma Police Department reported six inches of flowing water at the intersection of Harrison and Raucon near the Arroyo Roma in the city of Roma.
Falfurrias Fire Department reported flooding on Noble Street and at the intersection of St. Marys Street and Bennett Street. Radar estimated of 2.0 to 2.5 inches of rainfall in less than an hour.
Rio Grande City Police Department reported flooding on Embassy Street, La Loma, and at the intersection of Main Street and Washington Street. Radar imagery estimated 2.5 to 3.0 inches of rainfall.
McAllen Emergency Manager reported a tree down on Kennedy Avenue near 10th Street in McAllen. Time estimated by radar imagery and KMFE ASOS.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2017Every state in 2017This day in weather historyWarnings in Texas, May 2017
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 703997, 704000, 704002, 703998, 704003, 703990.