Alert archive / Texas / Tornado Warnings in 2010

Tornado Warning 11, NWS Houston/Galveston, TX

June 9, 2010Houston County, Madison County, Walker County, Texas

NWS Houston/Galveston, TX issued this tornado warning at Jun 9, 2010, 7:57 AM CDT for Houston County, Madison County, Walker County, Texas. It was in force for 33 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: Jun 9, 2010, 7:57 AM CDT (12:57 UTC)
Expired: Jun 9, 2010, 8:30 AM CDT
In force: 33 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon

Counties Houston County, TX, Madison County, TX, Walker County, TX

The radar

The Ft Hood radar (KGRK), 169 km from the middle of the area, began a volume at 12:59 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 1.0 hours before the alert went out and 254 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: 3174 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 576 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this tornado warning 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 tornado warning went out at Jun 9, 6:35 AM CDT, 1 hour 22 minutes earlier.

Area forecast discussion, Jun 9, 6:35 AM CDT, 1 hour 22 minutes before

AREA FORECAST DISCUSSION...UPDATED FOR AVIATION/MARINE
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
635 AM CDT WED JUN 9 2010

.DISCUSSION...
THE UPPER LOW OVER S TX WILL SLOWLY MOVE NORTH-NORTHEASTWARD
TODAY. THE MODELS DIFFER SOMEWHAT ON THE SPEED AND LOCATION OF THE
LOW TONIGHT THROUGH LATE THURSDAY. PREFER A SLOWER MOVEMENT
TONIGHT AS THE UPSTREAM TROUGH APPEARS TO BE TOO FAR AWAY OVER
THE PACIFIC COAST. WITH THE LOW BEING SO CLOSE...LIKELY TO
CATEGORICAL POPS LOOK CERTAIN TODAY OVER MOST OF THE INLAND
COUNTIES. THE RAINFALL AREA EARLIER THIS MORNING OVER THE HILL
COUNTRY ACTUALLY MIMICKED A CORE RAIN EVENT. THE MODELS DID
INDICATE THAT THIS SCENARIO IS POSSIBLE AGAIN TONIGHT AND KEPT
LIKELY POPS OVER THE FAR NORTHERN COUNTIES. FOR THURSDAY...WENT
WITH HIGHER POPS THAN GUIDANCE GIVEN THE PREFERRED SLOWER MOVEMENT
OF THE LOW AND ITS POSITION JUST TO THE NORTH OR NORTHEAST OF THE
FORECAST AREA. THE LOW SHOULD GET PICKED UP AND SHEARED OFF
THURSDAY NIGHT AND FRIDAY AS THE UPSTREAM TROUGH MOVES ACROSS THE
ROCKIES.

THE MAIN CHALLENGE FOR TODAY CONCERNS THE HEAVY RAINFALL
POSSIBILITY. MODEL PW/S REACH AT OR ABOVE 2.25 INCHES AND THE
FORECAST SOUNDING PROFILES ARE CONDUCIVE FOR LOCALLY HEAVY
RAINFALL...ESPECIALLY OVER THE NORTHWESTERN SET OF COUNTIES. THE
GRIDDED FLASH FLOOD GUIDANCE IN THE FAR NORTHWEST BETWEEN COLORADO
AND HOUSTON COUNTIES IS LOW ENOUGH TO CONSIDER A FLOOD/FLASH FLOOD
WATCH. THOUGHT THAT THE 3KM WRF AND NAM12 DEPICTED THE SITUATION
WELL FOR TODAY IN COMBINATION WITH THE OTHER MODEL GUIDANCE. THESE
KEEP THE HEAVIEST RAINFALL OVER THE NORTHWEST. THE HPC QPF
GUIDANCE FIT WELL WITH THESE AND BASIN WIDE RAINFALL AMOUNTS OF
ONE TO THREE INCHES IS POSSIBLE. BECAUSE OF THIS...WILL ISSUE A
FLASH FLOOD WATCH FOR THE FAR WESTERN SET OF COUNTIES STARTING AT
12Z THIS MORNING AND ENDING AT 00Z THIS EVENING. WILL REASSESS THE
SITUATION FOR TONIGHT LATER TODAY.

BEYOND THURSDAY A RETURN TO A MORE SUMMER TIME PATTERN OCCURS.
BOTH THE GFS AND THE ECMWF DEVELOP AN UPPER LEVEL HIGH PRESSURE
AREA OVER THE LOWER MISSISSIPPI VALLEY EARLY NEXT WEEK. VERY WARM
DAY TIME TEMPERATURES SHOULD RESULT BEGINNING THIS WEEKEND.

40

&&

.AVIATION...
NUMEROUS SHRA/TSRA EXPECTED ACROSS SE TX TODAY LIKELY TO IMPACT ALL
OF THE TERMINALS. UPPER LOW PUSHING THROUGH CENTRAL TEXAS WILL
CONTINUE TO RESULT IN ROUNDS OF CONVECTION OVER THE AREA. THE
GREATEST COVERAGE WILL BE NORTH AND WEST OF KIAH. FREQUENT
LIGHTNING...WIND GUSTS TO 40 KTS...HEAVY RAINFALL...AND REDUCED
VISIBILITIES ARE LIKELY IN THE STRONGEST STORMS. HAVE BLANKETED VCTS
IN THE TAFS THROUGH 01Z AS WILL BE DIFFICULT TO TIME THE CLUSTERS OF
STORMS. MVFR CEILINGS ARE LIKELY IN THE CLUSTERS OF STORMS. EXPECT
ACTIVITY TO DIMINISH AROUND SUNSET. MVFR STRATUS DEVELOPMENT IS
LIKELY LATE TONIGHT AND EARLY THURSDAY. LESS CONVECTIVE COVERAGE IS
EXPECTED THURSDAY AS THE LOW BEGINS TO LIFT AWAY FROM THE AREA.

IMPORTANT NOTE...THE KLBX TAF WILL REMAIN NIL UNTIL THE ASOS IS
RESTORED. THE ESTIMATED TIME ASOS WILL BE RESTORED IS SOMETIME
DURING THE LAST WEEK OF JUNE.

35

&&

.MARINE...
LIGHT TO MODERATE ONSHORE FLOW WILL PERSIST THROUGH THURSDAY. WINDS
WILL BEGIN TO INCREASE THURSDAY THROUGH SATURDAY AS LOW PRESSURE
DEVELOPS OVER THE SRN PLAINS. CAUTION FLAGS WILL LIKELY BE NEEDED
THIS PERIOD AS WINDS INCREASE TO 15-20 KNOTS AND SEAS BUILD TO 4 TO
6 FEET. WINDS WILL SUBSIDE BEGINNING SUNDAY AS THE PRESSURE GRADIENT
FLATTENS.  35

&&

.PRELIMINARY POINT TEMPS/POPS...
COLLEGE STATION (CLL)      86  77  88  76  93 /  80  50  50  20  20
HOUSTON (IAH)              88  78  91  77  93 /  60  20  50  10  20
GALVESTON (GLS)            86  80  88  81  89 /  30  20  30  10  20

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...FLASH FLOOD WATCH THROUGH THIS EVENING FOR THE FOLLOWING ZONES:
     AUSTIN...BRAZOS...BURLESON...COLORADO...GRIMES...HOUSTON...
     MADISON...WASHINGTON.

GM...NONE.
&&

DISCUSSION...40
AVIATION/MARINE...35

Hazardous weather outlook, Jun 9, 7:32 AM CDT, 25 minutes before

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In the hours before

Special weather statement, Jun 9, 5:43 AM CDT, 2 hours 14 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
543 AM CDT WED JUN 9 2010

TXZ177-198-199-091145-
GRIMES-MONTGOMERY-WALKER-
543 AM CDT WED JUN 9 2010

...SIGNIFICANT WEATHER ADVISORY...

AT 539 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER SOUTH CENTRAL GRIMES COUNTY...MOVING
NORTHEAST AT 20 MPH.

WINDS GREATER THAN 40 MPH AND BRIEF HEAVY DOWNPOURS ARE POSSIBLE
WITH THIS STORM.

LOCATIONS IN THE PATH OF THIS STORM INCLUDE...RICHARDS...
PLANTERSVILLE...DOBBIN...DACUS...AND TODD MISSION.

GUSTY WINDS MAY CAUSE UNSECURED SMALL OBJECTS SUCH AS TRASH CANS TO
BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE OR NON-CONVERTIBLE
AUTOMOBILE UNTIL THIS STORM HAS PASSED.

LAT...LON 3069 9553 3024 9583 3024 9589 3030 9603
      3080 9581
TIME...MOT...LOC 1042Z 206DEG 19KT 3034 9589

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 4:57 AM CDT	Flood Watch	HGX	Austin, Brazos, Burleson, Colorado, Grimes, Houston and 8 more	34 hr
Jun 9, 5:43 AM CDT	Special Weather Statement	HGX	Grimes	62 min
Jun 9, 7:12 AM CDT	Tornado Warning	HGX	Grimes, Montgomery, Walker	24 min
Jun 9, 8:29 AM CDT	Tornado Warning	HGX	Houston, Trinity, Walker	31 min
Jun 9, 8:58 AM CDT	Flash Flood Warning	HGX	Brazos, Burleson, Grimes, Washington	2 hr
Jun 9, 9:07 AM CDT	Special Weather Statement	HGX	Madison, Walker	53 min
Jun 9, 10:22 AM CDT	Special Weather Statement	HGX	Houston, Trinity	53 min
Jun 9, 10:40 AM CDT	Severe Thunderstorm Warning	HGX	Austin, Colorado, Washington	65 min
Jun 9, 10:57 AM CDT	Flash Flood Warning	HGX	Brazos, Burleson, Grimes, Madison, Washington	3 hr
Jun 9, 11:42 AM CDT	Special Weather Statement	HGX	Brazos	63 min
Jun 9, 12:40 PM CDT	Severe Thunderstorm Warning	HGX	Grimes, Montgomery, Walker	50 min
Jun 9, 12:46 PM CDT	Tornado Warning	HGX	Montgomery	29 min
Jun 9, 1:54 PM CDT	Flash Flood Warning	HGX	Brazos, Burleson, Grimes, Madison, Washington	111 min
Jun 9, 2:50 PM CDT	Severe Thunderstorm Warning	HGX	Liberty, Polk, San Jacinto	40 min
Jun 9, 4:26 PM CDT	River Flood Warning	HGX	Burleson, Washington	18 hr
Jun 9, 4:26 PM CDT	River Flood Warning	HGX	Burleson, Lee	18 hr
Jun 9, 4:26 PM CDT	River Flood Warning	HGX	Burleson, Lee	45 hr
Jun 9, 4:51 PM CDT	Areal Flood Advisory	HGX	Brazos, Burleson, Grimes, Madison, Walker	114 min
Jun 9, 6:05 PM CDT	Flash Flood Warning	HGX	Brazos, Grimes, Madison, Walker	115 min

Nearby

Tornado Warnings in Texas, 2010 Every tornado warning in 2010 Tornadoes in 2010

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.