Alert archive / Texas / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 21, NWS Houston/Galveston, TX

April 17, 2016Harris County, Montgomery County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 17, 2016, 11:29 PM CDT for Harris County, Montgomery County, Texas. It was in force for 31 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 17, 2016, 11:29 PM CDT (04:29 UTC)
Expired: Apr 18, 2016, 12:00 AM CDT
In force: 31 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Harris County, TX, Montgomery County, TX

The radar

The Houston radar (KHGX), 73 km from the middle of the area, began a volume at 04:32 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.

What was reported inside it

Time	Report	Where	Remark
Apr 18, 12:05 AM CDT	TSTM WND DMG	3 S Tomball, TX	A LARGE PINE TREE WAS SNAPPED OFF ON HIGHWAY 249 BETWEEN CANYON GATES POINT DRIVE AND NORTHPOINTE BLVD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 4.5 hours before the alert went out and 227 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: 466 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 736 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

534 
WUUS54 KHGX 180429
SVRHGX
TXC201-339-180500-
/O.NEW.KHGX.SV.W.0021.160418T0429Z-160418T0500Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1129 PM CDT SUN APR 17 2016

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN MONTGOMERY COUNTY IN SOUTHEASTERN TEXAS...
  NORTH CENTRAL HARRIS COUNTY IN SOUTHEASTERN TEXAS...

* UNTIL MIDNIGHT CDT

* AT 1128 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR JERSEY
  VILLAGE...MOVING NORTH AT 30 MPH.

  HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE 
           TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  TOMBALL...JERSEY VILLAGE...PINEHURST...SPRING BRANCH NORTH...THE
  WOODLANDS...NORTHERN ADDICKS PARK TEN...SPRING BRANCH WEST...SPRING...
  OAK RIDGE NORTH...SHENANDOAH...STAGECOACH...CYPRESS...SPLASHTOWN...
  WILLOWBROOK...CARVERDALE...FAIRBANKS / NORTHWEST CROSSING...GREATER
  INWOOD...WESTBRANCH...HOOKS AIRPORT AND SPRING BRANCH CENTRAL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

THIS STORM IS PRODUCING LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS!

LARGE HAIL AND DAMAGING WINDS AND CONTINUOUS CLOUD TO GROUND
LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY.
LIGHTNING IS ONE OF NATURE'S LEADING KILLERS. REMEMBER...IF YOU CAN
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 2981 9549 2983 9570 3024 9571 3021 9540
TIME...MOT...LOC 0428Z 185DEG 25KT 2993 9559 

HAIL...1.00IN
WIND...60MPH
 
$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 7:30 PM CDT	Special Weather Statement	HGX	Colorado	45 min
Apr 17, 8:10 PM CDT	Special Weather Statement	HGX	Colorado	65 min
Apr 17, 8:33 PM CDT	Special Weather Statement	HGX	Fort Bend, Waller	57 min
Apr 17, 8:53 PM CDT	Areal Flood Advisory	HGX	Colorado, Wharton	3 hr
Apr 17, 9:28 PM CDT	Areal Flood Advisory	HGX	Austin, Fort Bend, Harris, Waller	2 hr
Apr 17, 9:38 PM CDT	Flash Flood Warning	HGX	Fort Bend, Harris, Waller	112 min
Apr 17, 10:36 PM CDT	Flash Flood Warning	HGX	Austin, Colorado, Harris, Waller	3 hr
Apr 17, 11:11 PM CDT	River Flood Warning	HGX	Harris, Waller	7 days
Apr 17, 11:15 PM CDT	Special Weather Statement	HGX	Harris	45 min
Apr 17, 11:17 PM CDT	Special Weather Statement	HGX	Waller	43 min
Apr 17, 11:22 PM CDT	Flash Flood Warning	HGX	Grimes, Harris, Montgomery, Waller	3 hr
Apr 17, 11:57 PM CDT	Severe Thunderstorm Warning	HGX	Harris, Montgomery	63 min
Apr 18, 12:04 AM CDT	Flash Flood Warning	HGX	Austin, Fort Bend, Harris, Montgomery, Waller	3 hr
Apr 18, 12:07 AM CDT	Tornado Warning	HGX	Harris, Montgomery	38 min
Apr 18, 12:39 AM CDT	River Flood Warning	HGX	Harris	45 hr
Apr 18, 12:48 AM CDT	River Flood Warning	HGX	Harris	45 hr
Apr 18, 1:04 AM CDT	River Flood Warning	HGX	Harris	69 hr
Apr 18, 1:15 AM CDT	Flash Flood Warning	HGX	Harris, Montgomery	3 hr
Apr 18, 1:23 AM CDT	Hydrologic Statement	HGX	Harris	6 days
Apr 18, 1:37 AM CDT	Flash Flood Warning	HGX	Austin, Colorado, Waller, Washington	3 hr
Apr 18, 1:44 AM CDT	Flash Flood Warning Emergency	HGX	Grimes, Harris, Waller	3 hr
Apr 18, 1:47 AM CDT	Flash Flood Warning	HGX	Grimes, Montgomery, San Jacinto, Walker	3 hr
Apr 18, 2:04 AM CDT	Flash Flood Warning Emergency	HGX	Harris	3 hr
Apr 18, 2:09 AM CDT	River Flood Warning	HGX	Harris, Montgomery	44 hr
Apr 18, 2:09 AM CDT	River Flood Warning	HGX	Harris, Montgomery	4 days
Apr 18, 2:09 AM CDT	Hydrologic Statement	HGX	Harris, Montgomery	6 days
Apr 18, 2:09 AM CDT	Hydrologic Statement	HGX	Harris	6 days
Apr 18, 2:09 AM CDT	Hydrologic Statement	HGX	Harris	6 days
Apr 18, 2:31 AM CDT	Flash Flood Warning	HGX	Grimes, Harris, Montgomery, Waller	2 hr
Apr 18, 3:03 AM CDT	Severe Thunderstorm Warning	HGX	Harris	27 min
Apr 18, 3:13 AM CDT	Tornado Warning	HGX	Harris	32 min
Apr 18, 3:14 AM CDT	River Flood Warning	HGX	Fort Bend, Harris	6 days
Apr 18, 3:14 AM CDT	River Flood Warning	HGX	Harris	6 days
Apr 18, 3:14 AM CDT	River Flood Warning	HGX	Harris	6 days
Apr 18, 3:14 AM CDT	River Flood Warning	HGX	Harris	6 days
Apr 18, 3:14 AM CDT	River Flood Warning	HGX	Harris	4 days
Apr 18, 3:14 AM CDT	River Flood Warning	HGX	Harris, Montgomery	4 days
Apr 18, 3:22 AM CDT	River Flood Warning	HGX	Colorado, Wharton	3 days
Apr 18, 3:23 AM CDT	Flash Flood Warning	HGX	Fort Bend, Harris, Waller	97 min
Apr 18, 3:28 AM CDT	Flash Flood Warning	HGX	Austin, Colorado	92 min
Apr 18, 3:38 AM CDT	Tornado Warning	HGX	Harris	27 min
Apr 18, 3:55 AM CDT	River Flood Warning	HGX	Harris	42 hr
Apr 18, 3:55 AM CDT	River Flood Warning	HGX	Harris	6 days
Apr 18, 3:55 AM CDT	River Flood Warning	HGX	Harris	6 days
Apr 18, 3:55 AM CDT	River Flood Warning	HGX	Harris	12 hr
Apr 18, 3:55 AM CDT	River Flood Warning	HGX	Harris	40 hr
Apr 18, 3:55 AM CDT	River Flood Warning	HGX	Harris	34 hr
Apr 18, 4:39 AM CDT	Flash Flood Warning Emergency	HGX	Austin, Colorado, Grimes, Harris, Montgomery, Waller	4 hr
Apr 18, 4:39 AM CDT	Flash Flood Warning	HGX	Austin, Colorado, Fort Bend, Grimes, Harris, Liberty and 7 more	4 hr
Apr 18, 4:51 AM CDT	River Flood Warning	HGX	Harris	41 hr
Apr 18, 4:51 AM CDT	River Flood Warning	HGX	Harris	41 hr
Apr 18, 4:51 AM CDT	River Flood Warning	HGX	Harris	41 hr
Apr 18, 4:52 AM CDT	Tornado Warning	HGX	Harris	23 min
Apr 18, 5:16 AM CDT	Coastal Flood Advisory	HGX	Brazoria, Matagorda	20 hr
Apr 18, 5:17 AM CDT	Severe Thunderstorm Warning	HGX	Chambers, Harris, Liberty	43 min
Apr 18, 5:39 AM CDT	Tornado Warning	HGX	Liberty	36 min
Apr 18, 5:57 AM CDT	Flash Flood Warning Emergency	HGX	Harris, Montgomery	3 hr
Apr 18, 5:59 AM CDT	River Flood Warning	HGX	Harris	40 hr
Apr 18, 5:59 AM CDT	River Flood Warning	HGX	Harris	40 hr
Apr 18, 5:59 AM CDT	River Flood Warning	HGX	Harris	40 hr
Apr 18, 5:59 AM CDT	River Flood Warning	HGX	Harris	26 hr
Apr 18, 6:12 AM CDT	River Flood Warning	HGX	Fort Bend, Harris	10 days
Apr 18, 6:12 AM CDT	River Flood Warning	HGX	Harris	10 days
Apr 18, 6:12 AM CDT	River Flood Warning	HGX	Harris	10 days
Apr 18, 6:12 AM CDT	River Flood Warning	HGX	Harris	10 days
Apr 18, 6:25 AM CDT	River Flood Warning	HGX	Harris	40 hr
Apr 18, 6:25 AM CDT	River Flood Warning	HGX	Harris	40 hr
Apr 18, 6:25 AM CDT	River Flood Warning	HGX	Harris	28 hr
Apr 18, 6:25 AM CDT	River Flood Warning	HGX	Harris	31 hr
Apr 18, 6:25 AM CDT	River Flood Warning	HGX	Harris	28 hr
Apr 18, 6:30 AM CDT	Flash Flood Warning Emergency	HGX	Austin, Colorado, Fort Bend, Harris, Waller	3 hr
Apr 18, 6:42 AM CDT	River Flood Warning	HGX	Harris	39 hr
Apr 18, 6:42 AM CDT	River Flood Warning	HGX	Harris	39 hr
Apr 18, 6:42 AM CDT	River Flood Warning	HGX	Harris	39 hr
Apr 18, 6:42 AM CDT	River Flood Warning	HGX	Harris	39 hr
Apr 18, 6:42 AM CDT	River Flood Warning	HGX	Harris	39 hr
Apr 18, 6:42 AM CDT	River Flood Warning	HGX	Harris	39 hr
Apr 18, 6:51 AM CDT	River Flood Warning	HGX	Harris	39 hr
Apr 18, 7:05 AM CDT	Flash Flood Warning Emergency	HGX	Fort Bend, Harris	115 min
Apr 18, 7:08 AM CDT	River Flood Warning	HGX	Harris	39 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2016 Every severe thunderstorm warning in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.