Alert archive / Texas / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 87, NWS Houston/Galveston, TX

May 9, 20194 counties in Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at May 9, 2019, 7:09 PM CDT for 4 counties in Texas. It was in force for 36 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
May 9, 2019, 7:09 PM CDT (00:09 UTC)
Expired
May 9, 2019, 7:45 PM CDT
In force
36 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Hail
1.25 in
Wind
50.0 mph

Counties Austin County, TX, Harris County, TX, Waller County, TX, Washington County, TX

The radar

The Houston radar (KHGX), 107 km from the middle of the area, began a volume at 00:11 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
May 9, 6:31 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 0.2 hours before the alert went out and 271 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 00:00Z on 2019-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 409 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 00:00Z on 2019-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.193958Sfc1 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
409 J/kg
Mixed-layer CIN
-201 J/kg
Mixed-layer LCL
819 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
86 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at May 9, 2:48 PM CDT, 4 hours 21 minutes earlier.

Area forecast discussion, May 9, 2:48 PM CDT, 4 hours 21 minutes before
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Hazardous weather outlook, May 9, 7:30 AM CDT, 11 hours 39 minutes before
Hazardous Weather Outlook
National Weather Service Houston/Galveston TX
730 AM CDT Thu May 9 2019

TXZ163-164-176>179-195>200-210>214-226-227-235>238-300-313-
335>338-101230-
Austin-Brazos-Burleson-Chambers-Coastal Brazoria-
Coastal Galveston-Coastal Harris-Coastal Jackson-
Coastal Matagorda-Colorado-Fort Bend-Grimes-Houston-
Inland Brazoria-Inland Galveston-Inland Harris-Inland Jackson-
Inland Matagorda-Madison-Montgomery-Northern Liberty-Polk-
San Jacinto-Southern Liberty-Trinity-Walker-Waller-Washington-
Wharton-
730 AM CDT Thu May 9 2019

This hazardous weather outlook is for portions of Southeast Texas..

.DAY ONE...Today and Tonight

A Flash Flood Watch is in effect from 1 PM today through 7 PM
Saturday. Showers and thunderstorms should develop today along a
stalled frontal boundary by this afternoon. Heavy rainfall will
be possible and could result in flash flooding and additional
rises on rivers and bayous. Damaging winds, hail, and isolated
tornadoes will also be possible.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

A Flash Flood Watch is in effect through 7 PM Saturday. Strong
storms are possible through the weekend. A series of upper level
disturbances coupled with a stalled front and abundant moisture
will create a favorable environment for heavy rain.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed today. Emergency managers
should also prepare for activation at various times through the
remainder of the week.

TXZ436>438-101230-
Brazoria Islands-Galveston Island and Bolivar Peninsula-
Matagorda Islands-
730 AM CDT Thu May 9 2019

This hazardous weather outlook is for portions of Southeast Texas..

.DAY ONE...Today and Tonight

A Flash Flood Watch is in effect from 1 PM today through 7 PM
Saturday. Showers and thunderstorms should develop today along a
stalled frontal boundary by this afternoon. Heavy rainfall will
be possible and could result in flash flooding and additional
rises on rivers and bayous. Damaging winds, hail, and isolated
tornadoes will also be possible.

Elevated tide levels will approach 3.5 feet this morning. Minor
coastal flooding will be possible, potentially impacting
vulnerable locations such as Highway 87 and 124. A coastal flood
advisory may be needed. Strong rip currents will also be possible
along Gulf facing beaches.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Elevated tide levels near 3.5 feet will continue through the end
of the week. Minor coastal flooding will be possible, potentially
impacting vulnerable locations such as Highway 87 and 124. Strong
rip currents will also be possible along Gulf facing beaches.

A Flash Flood Watch is in effect through 7 PM Saturday. Strong
storms are possible through the weekend. A series of upper level
disturbances coupled with a stalled front and abundant moisture
will create a favorable environment for heavy rain.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed today. Emergency managers
should also prepare for activation at various times through the
remainder of the week.

GMZ330-335-350-355-370-375-101230-
Coastal waters from Freeport to Matagorda Ship Channel TX out
20 NM-Coastal waters from High Island to Freeport TX out 20 NM-
Galveston Bay-Matagorda Bay-
Waters from Freeport to Matagorda Ship Channel TX from 20 to
60 NM-Waters from High Island to Freeport TX from 20 to 60 NM-
730 AM CDT Thu May 9 2019

This hazardous weather outlook is for portions of Southeast Texas..

.DAY ONE...Today and Tonight

Some showers and thunderstorms will be possible today, and could
produce heavy rainfall, gusty winds, and hail.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

A series of upper level disturbances will bring periods of showers
and thunderstorms through the remainder of the week. Some storms
could be strong with gusty winds, hail and periods of heavy rain.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed.

In the hours before

Special weather statement, May 9, 6:27 PM CDT, 42 minutes before
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Special weather statement, May 9, 6:50 PM CDT, 19 minutes before
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Special weather statement, May 9, 6:57 PM CDT, 12 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 9, 7:01 PM CDTSevere Thunderstorm WarningHGXColorado44 min
May 9, 7:16 PM CDTSevere Thunderstorm WarningHGXHarris44 min
May 9, 7:17 PM CDTAreal Flood AdvisoryHGXAustin, Harris, Montgomery, Waller, Washington118 min
May 9, 7:25 PM CDTAreal Flood AdvisoryHGXLiberty, Montgomery, Polk, San Jacinto2 hr
May 9, 7:32 PM CDTFlash Flood WarningHGXFort Bend, Harris, Waller118 min
May 9, 7:39 PM CDTSevere Thunderstorm WarningHGXPolk, San Jacinto51 min
May 9, 7:42 PM CDTSevere Thunderstorm WarningHGXHarris, Montgomery, Waller48 min
May 9, 7:44 PM CDTSevere Thunderstorm WarningHGXAustin, Harris, Waller, Washington46 min
May 9, 7:47 PM CDTSevere Thunderstorm WarningHGXColorado, Wharton43 min
May 9, 7:54 PM CDTSevere Thunderstorm WarningHGXHarris36 min
May 9, 8:02 PM CDTAreal Flood AdvisoryHGXGrimes, Harris, Montgomery, Waller118 min
May 9, 8:08 PM CDTSevere Thunderstorm WarningHGXPolk, San Jacinto, Trinity37 min
May 9, 8:13 PM CDTSevere Thunderstorm WarningHGXFort Bend, Harris47 min
May 9, 8:28 PM CDTSevere Thunderstorm WarningHGXHarris32 min
May 9, 8:30 PM CDTSevere Thunderstorm WarningHGXAustin, Fort Bend, Wharton45 min
May 9, 8:32 PM CDTSevere Thunderstorm WarningHGXPolk, Trinity43 min
May 9, 8:46 PM CDTSevere Thunderstorm WarningHGXPolk, San Jacinto, Trinity44 min
May 9, 8:50 PM CDTSevere Thunderstorm WarningHGXColorado, Jackson, Wharton40 min
May 9, 8:56 PM CDTSevere Thunderstorm WarningHGXHarris, Montgomery64 min
May 9, 9:04 PM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Matagorda, Wharton41 min
May 9, 9:06 PM CDTRiver Flood WarningHGXHarris21 days
May 9, 9:06 PM CDTRiver Flood WarningHGXHarris21 days
May 9, 9:09 PM CDTSevere Thunderstorm WarningHGXAustin, Fort Bend, Waller, Wharton51 min
May 9, 9:11 PM CDTAreal Flood AdvisoryHGXBrazoria, Fort Bend, Galveston, Harris, Montgomery2 hr
May 9, 9:15 PM CDTAreal Flood AdvisoryHGXAustin, Colorado, Fort Bend, Harris, Waller, Wharton2 hr
May 9, 9:26 PM CDTSevere Thunderstorm WarningHGXFort Bend, Wharton34 min
May 9, 9:32 PM CDTFlash Flood WarningHGXFort Bend, Galveston, Harris, Montgomery3 hr
May 9, 9:33 PM CDTSevere Thunderstorm WarningHGXHarris42 min
May 9, 9:55 PM CDTSpecial Marine WarningHGX95 min
May 9, 10:12 PM CDTSevere Thunderstorm WarningHGXChambers, Harris, Liberty33 min
May 9, 10:29 PM CDTRiver Flood WarningHGXHarris21 days
May 9, 10:34 PM CDTAreal Flood AdvisoryHGXBrazoria, Chambers, Fort Bend, Galveston, Harris, Liberty and 2 more3 hr
May 9, 10:43 PM CDTSevere Thunderstorm WarningHGXBrazoria, Chambers, Galveston, Harris, Liberty47 min
May 9, 11:02 PM CDTSpecial Marine WarningHGX118 min
May 9, 11:03 PM CDTTornado WarningHGXChambers, Galveston42 min
May 9, 11:08 PM CDTFlash Flood WarningHGXBrazoria, Chambers, Galveston, Harris, Liberty3 hr
May 9, 11:10 PM CDTSevere Thunderstorm WarningHGXBrazoria, Chambers, Galveston, Harris, Liberty50 min
May 9, 11:11 PM CDTSpecial Marine WarningHGX2 hr
May 9, 11:20 PM CDTSmall Craft AdvisoryHGX12 hr
May 9, 11:22 PM CDTSpecial Marine WarningHGX38 min
May 9, 11:22 PM CDTTornado WarningHGXGalveston23 min
May 9, 11:36 PM CDTTornado WarningHGXChambers, Galveston24 min
May 9, 11:39 PM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Matagorda, Wharton36 min
May 9, 11:46 PM CDTSevere Thunderstorm WarningHGXJackson, Matagorda, Wharton44 min
May 9, 11:56 PM CDTSevere Thunderstorm WarningHGXBrazoria, Chambers, Galveston49 min
May 10, 12:10 AM CDTRiver Flood WarningHGXHarris34 hr
May 10, 12:22 AM CDTRiver Flood WarningHGXHarris15 hr
May 10, 12:24 AM CDTRiver Flood WarningHGXHarris8 hr
May 10, 12:33 AM CDTFlash Flood WarningHGXFort Bend, Galveston, Harris, Montgomery4 hr
May 10, 12:45 AM CDTSevere Thunderstorm WarningHGXBrazoria, Galveston, Matagorda30 min
May 10, 12:52 AM CDTSpecial Marine WarningHGX113 min
May 10, 1:16 AM CDTRiver Flood WarningHGXGalveston, Harris21 days
May 10, 2:02 AM CDTSpecial Marine WarningHGX88 min
May 10, 2:50 AM CDTRiver Flood WarningHGXHarris21 days
May 10, 2:50 AM CDTRiver Flood WarningHGXGalveston, Harris21 days
May 10, 2:50 AM CDTRiver Flood WarningHGXGalveston, Harris31 hr
May 10, 3:49 AM CDTRiver Flood WarningHGXHarris, Montgomery30 hr
May 10, 4:00 AM CDTRiver Flood WarningHGXBrazoria, Harris21 days
May 10, 4:35 AM CDTAreal Flood WarningHGXBrazoria, Chambers, Fort Bend, Galveston, Harris, Montgomery6 hr
May 10, 4:42 AM CDTSpecial Marine WarningHGX93 min
May 10, 4:48 AM CDTSpecial Marine WarningHGX57 min
May 10, 4:51 AM CDTRiver Flood WarningHGXMatagorda, Wharton29 hr
May 10, 5:04 AM CDTRiver Flood WarningHGXBrazoria, Harris21 days
May 10, 5:23 AM CDTAreal Flood WarningHGXGalveston3 hr
May 10, 7:05 AM CDTSpecial Marine WarningHGX85 min
May 10, 8:10 AM CDTRiver Flood WarningHGXLiberty, Polk, San Jacinto4 days
May 10, 9:53 AM CDTRiver Flood WarningHGXHarris, Montgomery24 hr
May 10, 11:49 AM CDTSmall Craft AdvisoryHGX7 hr
May 10, 3:13 PM CDTRip Current StatementHGXBrazoria, Galveston10 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2019Every severe thunderstorm warning in 2019

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.