Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 35, NWS Brownsville, TX

May 31, 2009Hidalgo County, Starr County, Texas

NWS Brownsville, TX issued this severe thunderstorm warning at May 31, 2009, 4:35 PM CDT for Hidalgo County, Starr County, Texas. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 31, 2009, 4:35 PM CDT (21:35 UTC)
Expired: May 31, 2009, 4:58 PM CDT
In force: 23 min
Issued by: NWS Brownsville, TX
Area: Storm-based polygon

Counties Hidalgo County, TX, Starr County, TX

The radar

The Brownsville radar (KBRO), 121 km from the middle of the area, began a volume at 21:38 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 12:00Z, 9.6 hours before the alert went out and 178 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: 1564 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 598 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -75 m²/s²
0-3 km storm-relative helicity: -74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at May 31, 1:51 PM CDT, 2 hours 44 minutes earlier.

Area forecast discussion, May 31, 1:51 PM CDT, 2 hours 44 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BROWNSVILLE TX
151 PM CDT SUN MAY 31 2009

.DISCUSSION...CONVECTION JUST GETTING UNDERWAY OVER OLD MEXICO AND
PORTIONS OF HIDALGO COUNTY WITH MOVEMENT TOWARDS THE NORTHWEST.
EXPECTING ACTIVITY TO INCREASE AND CONTINUE MOVING NORTHWEST SO WILL
ADD LOW END CHANCES ACROSS THE WESTERN COUNTIES MAINLY WEST OF 281
FOR THE EVENING HOURS. HAVE UPDATED THE THIS AFTERNOON GRID PERIOD
TO ACCOMMODATE THE DEVELOPING CONVECTION FOR THE REMAINDER OF THE
AFTERNOON. WILL HAVE THE AFTERNOON CREW MONITOR AND ISSUE NOWCAST
FOR THE ACTIVITY THAT DEVELOPS THE REMAINDER OF THE AFTERNOON.

CONVECTION ON MONDAY IS EXPECTED TO INCREASE IN AREAL COVERAGE
WITH THE COMBINATION OF AN UPPER LOW OR TROUGH MOVING ACROSS THE
FOUR CORNERS INTO THE SOUTHERN PLAINS...INCREASING UPPER
DIVERGENCE AND SOME SEA BREEZE INTERACTION. LOW END CHANCES WERE
PAINTED IN THE GRIDS FOR THE AFTERNOON ACROSS EASTERN AND CENTRAL
AREAS SPREADING WEST INTO THE EVENING HOURS. DO NOT THINK WHERE
WILL BE SEVERE WEATHER WITH WEAK SHEAR PRESENT AT THIS TIME...BUT
A HEAVY DOWNPOUR IS NOT OUT OF THE QUESTION WITH PRECIPITABLE
WATER VALUES RANGING BETWEEN 1.7 AND 1.9 INCHES.

DIURNAL CONVECTION CHANCE CONTINUE TUESDAY AND THEN BEGIN TO WANE
MIDWEEK AND BEYOND. SEA BREEZE CAN BE ALSO BE A TRIGGER THIS TIME
OF YEAR BUT CHANCES LOOK SLIM LATER AND AREAL COVERAGE IS NOT
EXPECTED LARGE ENOUGH TO WARRANT POPS IN THE FORECAST AT THIS
TIME.

TEMPERATURES SHOULD CONTINUE TO HOVER AROUND NORMAL THE FIRST FEW
DAYS OF THE WEEK THEN INCH UPWARD AS THE CONVECTION CHANCES WANE.
COMPROMISED BETWEEN MAV AND NAM IN THE SHORT TERM AND THEN A BLEND
OF THE PREVIOUS FORECAST AND NEW MEX NUMBERS FOR THE LATER HALF.
WINDS TO REMAIN LIGHT TO MODERATE WITH SEASONAL SEA BREEZES IN
THE AFTERNOON. MODELS BACKING OFF ON SOUTHERN PLACEMENT OF A FRONT
THAT WAS SHOWN TO VENTURE INTO THE REGION MID TO LATE IN THE WEEK.
DO NOT THINK THIS FRONT WILL MAKE ANY IMPACT ON THE REGION AND
SHOULD LIKELY DISSIPATE BEFORE IT REACHES DEEP SOUTH TEXAS. WITH
THE SUMMER SOLSTICE ONLY 3 WEEKS AWAY ANY FRONT WILL HAVE A HARD
TIME GETTING SOUTH OF SAN ANTONIO.

&&

.AVIATION...MARGINAL MVFR TO VFR CONDITIONS AT THE LOCAL TAF SITES
EARLY THIS AFTN AS CU FORMATION UNDERWAY. CI DEBRIS FROM EARLY MRNG
CONV IN MEXICO HAS THINNED OUT NICELY WITH JUST SOME REMNANTS
REMAINING THAT WILL EXIT THE AREA TO THE NE THRU MID AFTN. SHRAS
BEGINNING TO POP SOUTH OF THE INTERNATIONAL BORDER AS WELL AS IN
PORTIONS OF HIDALGO COUNTY NEAR MFE. THINK ACTIVITY SHOULD REMAIN
ISOLD AND WONT HAVE A LARGE IMPACT AT THE LOCAL TERMINALS BUT WILL
CONTINUE TO MONITOR TRENDS AND AMD TAF FCST AS NEEDED. HIGH CLDS
POSSIBLE OVRNGT DEPENDING ON PROPAGATION OF AFTN/EVE SHOWERS AND
STORMS SOUTH AND WEST OF THE AREA. SLIGHTLY BETTER CHC FOR SHOWERS
AND THUNDERSTORMS ACROSS AREA ON MON...BUT WILL LET LATER SHIFTS
DECIDE IF PLACEMENT INTO FCST IS WARRANTED. LIGHT TO MODERATE EAST
TO SOUTHEAST WINDS WILL PREVAIL THRU THE FCST PERIOD.

&&

.MARINE...THE 12 PM OBSERVATION FROM BUOY020 INDICATED WINDS WERE
EAST AROUND 12 KTS AND SEAS WERE AROUND 2 FT WITH A PERIOD OF 5
SECONDS. WITH HIGH PRESSURE CENTERED OFF TO THE NE ACROSS SECTIONS
OF THE NORTHWESTERN GULF OF MEXICO...THE LOWER TX COASTAL WATERS
WILL CONTINUE TO EXPERIENCE A LIGHT TO MODERATE ONSHORE FLOW. THIS
PATTERN IS ANTICIPATED TO PERSIST THE NEXT COUPLE DAYS. LOW SEAS ARE
EXPECTED TO PREVAIL THRU THE FCST PERIOD. THERE WILL BE A SLIGHT CHC
FOR SHOWERS AND THUNDERSTORMS ON MON.

&&

.PRELIMINARY POINT TEMPS/POPS...
BAYVIEW/PORT ISABEL  74  88  75  89 /  10  20  20  10
BROWNSVILLE          72  89  74  92 /  10  30  20  20
HARLINGEN            71  91  73  93 /  10  30  20  20
MCALLEN              73  94  74  95 /  20  30  20  20
RIO GRANDE CITY      72  96  74  98 /  20  20  30  10
SOUTH PADRE ISLAND   76  85  77  86 /  10  10  20  10

&&

.BRO WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
GM...NONE.
&&

THIS PRODUCT IS ALSO AVAILABLE ON THE WEB AT:
HTTP://WWW.WEATHER.GOV/BROWNSVILLE

59/57

Hazardous weather outlook, May 31, 3:49 AM CDT, 12 hours 46 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 31, 6:45 PM CDT	Flash Flood Warning	BRO	Zapata	90 min
May 31, 6:47 PM CDT	Severe Thunderstorm Warning	BRO	Zapata	43 min

Nearby

Severe Thunderstorm Warnings in Texas, 2009 Every severe thunderstorm warning in 2009

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.