Tornado Watch 470

Issued

Aug 27, 2017, 1:50 AM CDT (06:50 UTC)

Expired

Aug 27, 2017, 12:40 PM CDT

In force

11 hr

Issued by

the Storm Prediction Center

Strongest gust expected

60 kt

Counties Austin County, TX, Brazoria County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Harris County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, Waller County, TX, Wharton County, TX

The Houston radar (KHGX), 42 km from the middle of the area, began a volume at 06:53 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.

Two or more tornadoes

60%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

5%

One or more gusts of 65 knots or more

5%

Ten or more severe hail reports

5%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

30%

• Mesoscale Discussion 1583Aug 27, 4:04 AM CDT
• Mesoscale Discussion 1585Aug 27, 10:54 AM CDT

889 
WWUS20 KWNS 270643
SEL0  
SPC WW 270643
LAZ000-TXZ000-CWZ000-271800-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 470
NWS Storm Prediction Center Norman OK
145 AM CDT Sun Aug 27 2017

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Extreme southwestern Louisiana
  Southeast Texas
  Coastal Waters

* Effective this Sunday morning and afternoon from 145 AM until
  100 PM CDT.

* Primary threats include...
  A few tornadoes likely

SUMMARY...The threat for a few tornadoes will persist through at
least midday, east and northeast of the center of nearly stationary
Tropical Storm Harvey.

The tornado watch area is approximately along and 60 statute miles
either side of a line from 35 miles west northwest of Angleton TX to
5 miles north of Lake Charles LA. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU0).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.

&&

OTHER WATCH INFORMATION...This tornado watch replaces tornado
watch number 468. Watch number 468 will not be in effect after
145 AM CDT. 

AVIATION...TORNADOES and A FEW SEVERE THUNDERSTORMS WITH EXTREME
TURBULENCE and SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI
WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR 16035.


...Edwards

Tornado Watches in Texas, 2017Every tornado watch in 2017

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.