Alert archive / Texas / Special Weather Statements in 2021

Special Weather Statement, NWS Amarillo, TX

July 4, 2021Roberts County, Texas

NWS Amarillo, TX issued this special weather statement at Jul 4, 2021, 11:42 AM CDT for Roberts County, Texas. It was in force for 48 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: Jul 4, 2021, 11:42 AM CDT (16:42 UTC)
Expired: Jul 4, 2021, 12:30 PM CDT
In force: 48 min
Issued by: NWS Amarillo, TX

County Roberts County, TX

The radar

The Amarillo radar (KAMA), 100 km from the middle of the area, began a volume at 16:42 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 4.7 hours before the alert went out and 100 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: 997 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 825 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 133 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.3

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 Amarillo, TX wrote its last area forecast discussion before this special weather statement went out at Jul 4, 6:37 AM CDT, 5 hours 5 minutes earlier.

Area forecast discussion, Jul 4, 6:37 AM CDT, 5 hours 5 minutes before

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Hazardous weather outlook, Jul 4, 3:35 AM CDT, 8 hours 7 minutes before

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In the hours before

Special weather statement, Jul 4, 11:42 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Amarillo TX
1142 AM CDT Sun Jul 4 2021

TXZ009-014-041730-
Gray TX-Roberts TX-
1142 AM CDT Sun Jul 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN GRAY AND ROBERTS
COUNTIES UNTIL 1230 PM CDT...

At 1141 AM CDT, Doppler radar was tracking a strong thunderstorm 7
miles west of Codman, or 9 miles northeast of Pampa, moving south at
15 mph. Another strong storm was 15 miles north of Miami, moving
south at 15 mph.

Penny size hail and wind gusts of 50 to 55 mph will be possible with
this storm.

Locations impacted include...
Pampa, Miami, Codman and Lora.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take shelter in a sturdy building if threatening weather approaches.

&&

LAT...LON 3544 10101 3591 10103 3606 10057 3606 10054
      3546 10054
TIME...MOT...LOC 1641Z 352DEG 13KT 3567 10088

LG

The office that day

Everything else NWS Amarillo, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 4, 1:28 AM CDT	Special Weather Statement	AMA	Dallam	32 min
Jul 4, 12:34 PM CDT	Special Weather Statement	AMA	Gray	41 min
Jul 4, 2:42 PM CDT	Special Weather Statement	AMA	Sherman	48 min
Jul 4, 3:13 PM CDT	Special Weather Statement	AMA	Sherman	32 min
Jul 4, 3:21 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley, Moore, Sherman	54 min
Jul 4, 3:50 PM CDT	Areal Flood Advisory	AMA	Dallam	3 hr
Jul 4, 4:14 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley, Sherman	91 min
Jul 4, 4:32 PM CDT	Severe Thunderstorm Warning	AMA	Hartley, Moore, Oldham, Potter	65 min
Jul 4, 4:46 PM CDT	Areal Flood Advisory	AMA	Moore	3 hr
Jul 4, 4:49 PM CDT	Areal Flood Advisory	AMA	Sherman	2 hr
Jul 4, 5:03 PM CDT	Areal Flood Advisory	AMA	Dallam, Hartley	4 hr
Jul 4, 5:39 PM CDT	Flash Flood Warning	AMA	Dallam, Hartley	3 hr
Jul 4, 5:44 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley, Moore, Sherman	91 min
Jul 4, 6:20 PM CDT	Severe Thunderstorm Warning	AMA	Hansford, Sherman	85 min
Jul 4, 6:51 PM CDT	Special Weather Statement	AMA	Dallam	24 min
Jul 4, 6:59 PM CDT	Severe Thunderstorm Warning	AMA	Dallam	91 min
Jul 4, 3:04 AM CDT	Special Weather Statement	AMA	Texas	41 min
Jul 4, 3:47 PM CDT	Special Weather Statement	AMA	Texas	28 min
Jul 4, 5:54 PM CDT	Special Weather Statement	AMA	Beaver	36 min
Jul 4, 6:10 PM CDT	Special Weather Statement	AMA	Texas	35 min
Jul 4, 6:22 PM CDT	Areal Flood Advisory	AMA	Texas	3 hr

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.