Alert archive / Texas / Special Weather Statements in 2021

Special Weather Statement, NWS Houston/Galveston, TX

April 23, 2021Madison County, Texas

NWS Houston/Galveston, TX issued this special weather statement at Apr 23, 2021, 2:56 PM CDT for Madison County, Texas. It was in force for 49 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: Apr 23, 2021, 2:56 PM CDT (19:56 UTC)
Expired: Apr 23, 2021, 3:45 PM CDT
In force: 49 min
Issued by: NWS Houston/Galveston, TX

County Madison County, TX

The radar

The Ft Hood radar (KGRK), 158 km from the middle of the area, began a volume at 19:59 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 nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 7.9 hours before the alert went out and 248 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: 14 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 578 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 397 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Apr 23, 12:39 PM CDT, 2 hours 17 minutes earlier.

Area forecast discussion, Apr 23, 12:39 PM CDT, 2 hours 17 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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In the hours before

Special weather statement, Apr 23, 2:25 PM CDT, 31 minutes before

Special Weather Statement
National Weather Service Houston/Galveston TX
225 PM CDT Fri Apr 23 2021

TXZ177-198-199-232015-
Walker TX-Grimes TX-Montgomery TX-
225 PM CDT Fri Apr 23 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN GRIMES...
NORTHWESTERN MONTGOMERY AND SOUTHWESTERN WALKER COUNTIES UNTIL 315 PM
CDT...

At 225 PM CDT, Doppler radar was tracking a strong thunderstorm 8
miles east of Anderson, or 14 miles east of Navasota, moving north at
30 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Northwestern Huntsville, Bedias, Anderson, Crabbs Prairie, Roans
Prairie, Richards and Dacus.

A Tornado Watch remains in effect until 900 PM CDT for southeastern
Texas.

LAT...LON 3040 9574 3044 9599 3082 9596 3077 9561
TIME...MOT...LOC 1925Z 189DEG 28KT 3046 9585

Special weather statement, Apr 23, 2:56 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Houston/Galveston TX
256 PM CDT Fri Apr 23 2021

TXZ163-176-177-198-232045-
Madison TX-Walker TX-Grimes TX-Houston TX-
256 PM CDT Fri Apr 23 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN GRIMES...
SOUTHWESTERN HOUSTON...EASTERN MADISON AND NORTHWESTERN WALKER
COUNTIES UNTIL 345 PM CDT...

At 255 PM CDT, Doppler radar was tracking a strong thunderstorm 8
miles east of Bedias, or 15 miles south of Madisonville, moving north
at 35 mph.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Madisonville.

A Tornado Watch remains in effect until 900 PM CDT for southeastern
Texas.

LAT...LON 3114 9548 3067 9569 3067 9592 3108 9600
      3109 9598 3109 9577 3114 9577 3115 9575
TIME...MOT...LOC 1955Z 189DEG 31KT 3075 9582

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 23, 4:05 AM CDT	Beach Hazards Statement	HGX	Brazoria, Galveston, Matagorda	23 hr
Apr 23, 2:25 PM CDT	Special Weather Statement	HGX	Grimes	50 min
Apr 23, 4:35 PM CDT	Special Weather Statement	HGX	Grimes	40 min
Apr 23, 5:00 PM CDT	Areal Flood Advisory	HGX	Brazos, Grimes, Montgomery, Walker	60 min
Apr 23, 5:19 PM CDT	Severe Thunderstorm Warning	HGX	Montgomery, Walker	26 min
Apr 23, 5:31 PM CDT	Areal Flood Advisory	HGX	Montgomery, Polk, San Jacinto, Trinity, Walker	119 min
Apr 23, 5:45 PM CDT	Tornado Warning	HGX	Liberty, Montgomery, San Jacinto	30 min
Apr 23, 5:48 PM CDT	Severe Thunderstorm Warning	HGX	Montgomery, Polk, San Jacinto, Walker	27 min
Apr 23, 6:09 PM CDT	Tornado Warning	HGX	Liberty, Polk, San Jacinto	36 min
Apr 23, 6:27 PM CDT	Severe Thunderstorm Warning	HGX	Liberty, Polk	18 min

Nearby

Special Weather Statements in Texas, 2021 Every special weather statement in 2021

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.