Alert archive / Texas / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 92, NWS Houston/Galveston, TX

May 27, 202010 counties in Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at May 27, 2020, 4:28 PM CDT for 10 counties in Texas. It was in force for 62 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 27, 2020, 4:28 PM CDT (21:28 UTC)
Expired
May 27, 2020, 5:30 PM CDT
In force
62 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

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

The radar

The Houston radar (KHGX), 48 km from the middle of the area, began a volume at 21:28 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 27, 1:24 PM CDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 9.5 hours before the alert went out and 225 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 2020-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 827 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 12:00Z on 2020-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.19395878Sfc1 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
827 J/kg
Mixed-layer CIN
-60 J/kg
Mixed-layer LCL
1257 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

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 27, 1:32 PM CDT, 2 hours 56 minutes earlier.

Area forecast discussion, May 27, 1:32 PM CDT, 2 hours 56 minutes before
Area Forecast Discussion
National Weather Service Houston/Galveston TX
132 PM CDT Wed May 27 2020

.AVIATION...

Periods of SHRA/TSRA expected this afternoon and evening. Strong
to severe thunderstorms are possible along areas N of I-10 with
the highest probabilities of them developing over the NW quadrant
of the CWA. Hazards with these storms will be hail, strong
winds/downbursts, and lightning. Periods of IFR to MVFR vis/cigs
are also possible with +RA. A Severe Thunderstorm Watch is in
effect through 9 PM CDT today for most of the CWA. Conditions
improve overnight and winds will be light and VRB. Another round
of Iso to SCT SHRA/TSRA expected Thursday. 24

&&

.PREV DISCUSSION... /ISSUED 1142 AM CDT Wed May 27 2020/

UPDATE...

Minor adjustments to the T, PoPs, and Wx were made to the
inherited forecast for Today. Showers and thunderstorms continue
to be expected this afternoon and evening, with strong to severe
thunderstorms potentially developing over the NW quadrant of the
CWA. SPC continues the Enhanced Risk for Severe Thunderstorms
along the Colorado, Austin, Washington, Burleson, Brazos, and
Waller counties and a Slight Risk for most of the rest of SE
Texas. The most likely hazards with these storms are expected to
be hail and damaging winds; there is a low probability of tornado
(5%) development across the NW counties. 24

&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL)      65  86  66  88  67 /  80  40  10  10   0
Houston (IAH)              69  89  69  90  70 /  40  50  10  10  10
Galveston (GLS)            76  85  75  88  76 /  20  40  20  20  10

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
GM...NONE.
&&

Aviation...24

In the hours before

Local storm report, May 27, 2:56 PM CDT, 1 hour 32 minutes before
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Local storm report, May 27, 2:59 PM CDT, 1 hour 29 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
259 PM CDT WED MAY 27 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0245 PM     HAIL             3 S BRYAN               30.67N 96.34W
05/27/2020  E1.00 INCH       BRAZOS             TX   PUBLIC

            QUARTER SIZED HAIL NEAR THE INTERSECTION OF
            WILLIAM J BRYAN AND HIGHWAY 6.

&&
Special weather statement, May 27, 3:52 PM CDT, 36 minutes before
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Local storm report, May 27, 4:11 PM CDT, 17 minutes before
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Local storm report, May 27, 4:18 PM CDT, 10 minutes before
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Local storm report, May 27, 4:25 PM CDT, 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
425 PM CDT WED MAY 27 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0415 PM     TSTM WND GST     4 ENE BROOKSHIRE        29.80N 95.90W
05/27/2020  M60 MPH          WALLER             TX   AWOS

            WIND GUST WAS MEASURED AT THE HOUSTON
            EXECUTIVE AIRPORT (KTME).

&&

The office that day

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

IssuedProductOfficeCountiesLasted
May 26, 7:12 PM CDTSpecial Weather StatementHGXChambers48 min
May 26, 7:17 PM CDTSevere Thunderstorm WarningHGXChambers, Liberty43 min
May 26, 7:24 PM CDTAreal Flood AdvisoryHGXChambers, Liberty66 min
May 26, 8:23 PM CDTSpecial Weather StatementHGXChambers52 min
May 26, 9:25 PM CDTSpecial Weather StatementHGXChambers50 min
May 26, 9:30 PM CDTAreal Flood AdvisoryHGXChambers2 hr
May 26, 10:21 PM CDTSpecial Marine WarningHGX54 min
May 27, 1:45 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson60 min
May 27, 2:42 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson, Grimes, Washington48 min
May 27, 3:08 PM CDTSevere Thunderstorm WarningHGXAustin, Brazos, Grimes, Harris, Montgomery, Waller and 1 more52 min
May 27, 3:21 PM CDTTornado WarningHGXGrimes, Harris, Montgomery, Waller, Washington24 min
May 27, 3:52 PM CDTSpecial Weather StatementHGXLiberty38 min
May 27, 3:54 PM CDTSevere Thunderstorm WarningHGXAustin, Fort Bend, Harris, Montgomery, Waller36 min
May 27, 4:06 PM CDTSevere Thunderstorm WarningHGXHarris, Liberty, Montgomery24 min
May 27, 4:29 PM CDTSpecial Marine WarningHGX61 min
May 27, 4:45 PM CDTAreal Flood AdvisoryHGXBrazoria, Fort Bend, Harris2 hr
May 27, 4:50 PM CDTTornado WarningHGXChambers, Galveston, Harris13 min
May 27, 5:06 PM CDTSevere Thunderstorm WarningHGXBrazoria, Chambers, Fort Bend, Galveston, Harris, Liberty54 min
May 27, 5:14 PM CDTSpecial Marine WarningHGX31 min
May 27, 5:28 PM CDTAreal Flood AdvisoryHGXBrazoria, Chambers, Fort Bend, Galveston, Harris, Liberty115 min
May 27, 5:34 PM CDTSevere Thunderstorm WarningHGXFort Bend, Wharton26 min
May 27, 5:43 PM CDTSpecial Marine WarningHGX62 min
May 27, 6:09 PM CDTSpecial Weather StatementHGXBurleson51 min
May 27, 6:51 PM CDTSevere Thunderstorm WarningHGXBrazos, Grimes, Montgomery, Walker39 min
May 27, 6:55 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson, Washington20 min

Nearby

Severe Thunderstorm Warnings in Texas, 2020Every severe thunderstorm warning in 2020

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.