Alert archive / Texas / Special Weather Statements in 2012

Special Weather Statement, NWS Houston/Galveston, TX

July 17, 2012Walker County, Texas

NWS Houston/Galveston, TX issued this special weather statement at Jul 17, 2012, 5:01 PM CDT for Walker County, Texas. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 17, 2012, 5:01 PM CDT (22:01 UTC)
Expired: Jul 17, 2012, 5:45 PM CDT
In force: 44 min
Issued by: NWS Houston/Galveston, TX

County Walker County, TX

The radar

The Ft Hood radar (KGRK), 165 km from the middle of the area, began a volume at 22:02 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, 10.0 hours before the alert went out and 259 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: 3445 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 469 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: -20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 17, 3:53 PM CDT, 1 hour 8 minutes earlier.

Area forecast discussion, Jul 17, 3:53 PM CDT, 1 hour 8 minutes before

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Hazardous weather outlook, Jul 17, 7:06 AM CDT, 9 hours 55 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
706 AM CDT TUE JUL 17 2012

TXZ163-164-176>179-195>200-210>214-226-227-235>238-181215-
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-
706 AM CDT TUE JUL 17 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

ISOLATED SHOWERS AND THUNDERSTORMS WILL MOVE ASHORE THIS EARLY
THIS MORNING. AS TEMPERATURES RISE INTO THE MID 80S SHOWERS AND
THUNDERSTORMS WILL INCREASE IN CONVERAGE AND BECOME SCATTERED
ACROSS SOUTHEAST TEXAS GRADUALLY SPREADING FURTHER INLAND. RAINFALL
AMOUNTS WILL AVERAGE BETWEEN 0.25 AND 0.75 INCHES WITH SOME 1.0 TO
1.5 INCH TOTALS IN THE STRONGER STORMS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE WEDNESDAY AND
THURSDAY. HEAT INDEX VALUES WILL BEGIN TO INCREASE ON FRIDAY WITH
HEAT INDEX VALUES BETWEEN 102 AND 106 DEGREES OVER PARTS OF THE
AREA ON SATURDAY AND SUNDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Jul 17, 2:54 PM CDT, 2 hours 7 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
254 PM CDT TUE JUL 17 2012

TXZ199-213-172045-
HARRIS TX-MONTGOMERY TX-
254 PM CDT TUE JUL 17 2012

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN HARRIS AND
SOUTHEASTERN MONTGOMERY COUNTIES UNTIL 345 PM CDT...

AT 251 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS
TRACKING A LINE OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING
FROM CLOVERLEAF TO GALENA PARK TO SOUTH HOUSTON...AND MOVING NORTH
AT 15 MPH.

HAIL UP TO THE SIZE OF PEAS AND WIND GUSTS UP TO 40 MPH WILL BE
POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
HOUSTON...SPRING...THE WOODLANDS...CLOVERLEAF...HUMBLE...SOUTH
HOUSTON...ALDINE...GALENA PARK...JACINTO CITY...OAK RIDGE NORTH...
SHENANDOAH...PORTER HEIGHTS AND CHATEAU WOODS.

LAT...LON 2967 9518 2960 9535 2990 9550 3014 9554
      3026 9532 2984 9515
TIME...MOT...LOC 1951Z 168DEG 12KT 2984 9524 2975 9522 2970 9530

!KP!

Special weather statement, Jul 17, 4:43 PM CDT, 18 minutes before

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Special weather statement, Jul 17, 5:01 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 2:54 PM CDT	Special Weather Statement	HGX	Harris	51 min
Jul 17, 3:26 PM CDT	Severe Thunderstorm Warning	HGX	Harris, Montgomery	30 min
Jul 17, 3:42 PM CDT	Areal Flood Advisory	HGX	Harris, Montgomery	87 min
Jul 17, 4:43 PM CDT	Special Weather Statement	HGX	Madison	47 min
Jul 17, 4:57 PM CDT	Areal Flood Advisory	HGX	Houston, Madison, Walker	103 min
Jul 17, 5:32 PM CDT	Flash Flood Warning	HGX	Houston, Madison, Walker	59 min
Jul 17, 5:46 PM CDT	Special Weather Statement	HGX	Houston	74 min

Nearby

Special Weather Statements in Texas, 2012 Every special weather statement in 2012

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.