Alert archive / Texas / Tornado Warnings in 2017

Tornado Warning 68, NWS Houston/Galveston, TX

August 25, 2017Brazoria County, Fort Bend County, Texas

NWS Houston/Galveston, TX issued this tornado warning at Aug 25, 2017, 6:35 PM CDT for Brazoria County, Fort Bend County, Texas. It was in force for 25 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
Aug 25, 2017, 6:35 PM CDT (23:35 UTC)
Expired
Aug 25, 2017, 7:00 PM CDT
In force
25 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

Counties Brazoria County, TX, Fort Bend County, TX

The radar

The Houston radar (KHGX), 50 km from the middle of the area, began a volume at 23:36 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 25, 2:02 PM CDTTornado WatchSPC12 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.6 hours before the alert went out and 242 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, Lake Charles Mun, LA at 12:00Z on 2017-08-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1337 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 12:00Z on 2017-08-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 102 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
1337 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
748 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
102 m²/s²
0-3 km storm-relative helicity
124 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

149 
WFUS54 KHGX 252335
TORHGX
TXC039-157-260000-
/O.NEW.KHGX.TO.W.0068.170825T2335Z-170826T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Houston/Galveston TX
635 PM CDT FRI AUG 25 2017

The National Weather Service in League City has issued a

* Tornado Warning for...
  South central Fort Bend County in southeastern Texas...
  Central Brazoria County in southeastern Texas...

* Until 700 PM CDT.

* At 635 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Richwood, or near Clute, moving northwest at 40
  mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* Locations impacted include...
  Northern Lake Jackson, Angleton, West Columbia, Richwood, Holiday
  Lakes and Bailey's Prairie.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 2910 9526 2902 9532 2920 9575 2936 9563
TIME...MOT...LOC 2335Z 123DEG 33KT 2910 9537 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

40
1 follow-up statement
182 
WWUS54 KHGX 252348
SVSHGX

Severe Weather Statement
National Weather Service Houston/Galveston TX
648 PM CDT FRI AUG 25 2017

TXC039-157-260000-
/O.CON.KHGX.TO.W.0068.000000T0000Z-170826T0000Z/
Fort Bend TX-Brazoria TX-
648 PM CDT FRI AUG 25 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR SOUTH
CENTRAL FORT BEND AND CENTRAL BRAZORIA COUNTIES...
    
At 648 PM CDT, a severe thunderstorm capable of producing a tornado
was located over eastern Bailey's Prairie, or over Angleton, moving
northwest at 35 mph.

HAZARD...Tornado. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

Locations impacted include...
Northeastern Lake Jackson, Angleton, West Columbia, Richwood, Holiday
Lakes and Bailey's Prairie.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 2920 9575 2936 9563 2916 9535 2906 9542
TIME...MOT...LOC 2348Z 122DEG 32KT 2916 9548 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

40

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 25, 3:27 AM CDTSpecial Marine WarningHGX63 min
Aug 25, 4:01 AM CDTSpecial Marine WarningHGX89 min
Aug 25, 9:24 AM CDTSpecial Marine WarningHGX66 min
Aug 25, 10:15 AM CDTSpecial Marine WarningHGX60 min
Aug 25, 10:43 AM CDTTornado WarningHGXMatagorda13 min
Aug 25, 11:09 AM CDTSpecial Marine WarningHGX66 min
Aug 25, 11:16 AM CDTSpecial Marine WarningHGX59 min
Aug 25, 11:22 AM CDTTornado WarningHGXMatagorda13 min
Aug 25, 12:23 PM CDTSpecial Marine WarningHGX67 min
Aug 25, 12:53 PM CDTSpecial Marine WarningHGX37 min
Aug 25, 12:58 PM CDTAreal Flood AdvisoryHGXMatagorda3 hr
Aug 25, 1:47 PM CDTSpecial Marine WarningHGX28 min
Aug 25, 1:48 PM CDTTornado WarningHGXGalveston27 min
Aug 25, 2:02 PM CDTSpecial Marine WarningHGX28 min
Aug 25, 2:08 PM CDTTornado WarningHGXBrazoria, Matagorda37 min
Aug 25, 2:14 PM CDTTornado WarningHGXGalveston31 min
Aug 25, 2:29 PM CDTSpecial Marine WarningHGX16 min
Aug 25, 2:41 PM CDTTornado WarningHGXGalveston19 min
Aug 25, 2:42 PM CDTSpecial Marine WarningHGX33 min
Aug 25, 2:44 PM CDTSpecial Marine WarningHGX31 min
Aug 25, 2:44 PM CDTTornado WarningHGXGalveston11 min
Aug 25, 3:03 PM CDTSpecial Marine WarningHGX27 min
Aug 25, 3:03 PM CDTTornado WarningHGXBrazoria27 min
Aug 25, 3:09 PM CDTTornado WarningHGXBrazoria36 min
Aug 25, 3:13 PM CDTSpecial Marine WarningHGX32 min
Aug 25, 3:23 PM CDTSpecial Marine WarningHGX37 min
Aug 25, 3:27 PM CDTTornado WarningHGXMatagorda21 min
Aug 25, 3:42 PM CDTTornado WarningHGXGalveston33 min
Aug 25, 3:48 PM CDTTornado WarningHGXBrazoria, Fort Bend, Matagorda, Wharton27 min
Aug 25, 3:54 PM CDTSpecial Marine WarningHGX36 min
Aug 25, 4:07 PM CDTTornado WarningHGXBrazoria, Galveston23 min
Aug 25, 4:37 PM CDTAreal Flood AdvisoryHGXBrazoria, Galveston113 min
Aug 25, 5:19 PM CDTTornado WarningHGXBrazoria, Matagorda, Wharton26 min
Aug 25, 5:23 PM CDTSpecial Marine WarningHGX52 min
Aug 25, 5:26 PM CDTSpecial Marine WarningHGX34 min
Aug 25, 5:31 PM CDTTornado WarningHGXBrazoria, Fort Bend, Matagorda, Wharton14 min
Aug 25, 5:42 PM CDTTornado WarningHGXBrazoria, Fort Bend, Matagorda, Wharton33 min
Aug 25, 5:45 PM CDTTornado WarningHGXBrazoria30 min
Aug 25, 6:07 PM CDTSpecial Marine WarningHGX23 min
Aug 25, 6:08 PM CDTSpecial Marine WarningHGX37 min
Aug 25, 6:08 PM CDTTornado WarningHGXBrazoria, Fort Bend, Matagorda, Wharton26 min
Aug 25, 6:11 PM CDTSpecial Marine WarningHGX49 min
Aug 25, 6:13 PM CDTTornado WarningHGXBrazoria, Fort Bend, Matagorda, Wharton32 min
Aug 25, 6:39 PM CDTTornado WarningHGXBrazoria, Galveston36 min
Aug 25, 6:50 PM CDTSpecial Marine WarningHGX25 min
Aug 25, 6:53 PM CDTTornado WarningHGXBrazoria, Galveston22 min
Aug 25, 6:59 PM CDTSpecial Marine WarningHGX61 min

Nearby

Tornado Warnings in Texas, 2017Every tornado warning in 2017Tornadoes in 2017

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.