Alert archive / Texas / Special Weather Statements in 2020

Special Weather Statement, NWS Amarillo, TX

July 19, 2020Roberts County, Texas

NWS Amarillo, TX issued this special weather statement at Jul 19, 2020, 7:28 PM CDT for Roberts County, Texas. It was in force for 32 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 19, 2020, 7:28 PM CDT (00:28 UTC)
Expired: Jul 19, 2020, 8:00 PM CDT
In force: 32 min
Issued by: NWS Amarillo, TX

County Roberts County, TX

The radar

The Amarillo radar (KAMA), 130 km from the middle of the area, began a volume at 00:29 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

Dodge City, (KDDC), launched 00:00Z, 0.5 hours before the alert went out and 206 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: 2354 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 1620 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.9

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 19, 7:00 PM CDT, 28 minutes earlier.

Area forecast discussion, Jul 19, 7:00 PM CDT, 28 minutes before

Area Forecast Discussion
National Weather Service Amarillo TX
700 PM CDT Sun Jul 19 2020

.AVIATION...
Scattered storms in the NW Panhandles will likely congeal into a
complex that will head SE toward AMA. How well it holds together
and whether it reaches AMA is the million dollar questions as
this is about where models show is weakening and dissipating. MVFR
or even IFR conditions are expected with the storms however was
not too agressive with that in TAFs. Some storms will become
strong to severe, although the severe threat will decrease late
in the evening. Large scale outflow boundary will lead to a
temporary wind shift to the NW that will be difficult to forecast
timing on. Another round of afternoon and evening storms is
expected tomorrow, however the east southeast progression out of
NM and CO may be less which means DHT will have the greatest
threat.

&&

.PREV DISCUSSION... /Issued 217 PM CDT Sun Jul 19 2020/

SHORT TERM...Tonight through Monday night

Same 'ole same 'ole is kind of the story as isolated storms are
again possible this afternoon but better chances move in from ern
NM a bit later. Instability and shear values are not expected to
be significantly different from those seen yesterday (750-1250
J/kg MLCAPE/effective shear 20kts) and therefore storm intensity
should be fairly similar to what we saw yesterday and last night.
Shear values are a touch better, so could see a bit more of a
multicell situation with some cold pool generation possible. Given
easterly upslope flow and a bit more shear in ern NM, do expect
coverage over there to be better and therefore storm probs in the
western zones are a bit higher than yesterday as those storms
move in after 6 or 7 PM. Unfortunately for those from roughly
Amarillo to Pampa to Canadian southeastward, chances for
significant rain are pretty low as any convective system will
likely be dissipating as it moves east.

Monday looks fairly similar to today with highs in the 90s and
storms moving in from NM late.

Simpson

LONG TERM...Tuesday through Saturday...
Tuesday the upper level ridge over the Four Corners will setup yet
another day for storms across the western Panhandles. At the same
time, an upper level closed low will be forming off the West
Coast. The upper level ridge will push east through Thursday as
the upper level closed low begins to enter the western coast along
California. Through the remainder of the extended period, the
ridge will sit over the southeast CONUS while the upper level low
gets wrapped around the ridge and absorbed into the main flow
across the northern CONUS. Winds aloft will become southerly at
this time, which sets up the pattern to cut off any chance for
monsoonal moisture across the forecast area.

Storms Tuesday are expected to be isolated in nature with mountain
convection firing in the afternoon hours and attempting to make it
into the western Panhandles. The NAM is hinting at some backing
winds during the afternoon hours Tuesday with a potential for
upslope flow that could create a few pop up showers/storms along
the Caprock. Instability parameters are sufficient enough to
support a few strong storms with MLCAPE values anywhere between
500-1000 J/kg, but shear is the lacking component with values
around 10-20 knots. Dewpoints are not likely to get above the mid
to upper 50s, so storms will not have a ton of surface moisture to
work with. Main threats at this time would be gusty winds.

High temperatures through the long term will remain steady in the
90s with low temperatures in the mid 60s to lower 70s. The NAM is
an outlier with a potential weak surface cold front pushing south
across the Panhandles Tuesday night into Wednesday morning. This
could dip low temperatures into the 50s, but winds will quickly
turn back to the south Wednesday and temperatures will rebound
quickly to the 90s that afternoon.

Rutt

&&

.AMA Watches/Warnings/Advisories...
TX...None.
OK...None.

&&

88/88

Hazardous weather outlook, Jul 19, 2:26 PM CDT, 5 hours 2 minutes before

Hazardous Weather Outlook
National Weather Service Amarillo TX
226 PM CDT Sun Jul 19 2020

OKZ001>003-TXZ001>020-317-201200-
Cimarron-Texas-Beaver-Dallam-Sherman-Hansford-Ochiltree-Lipscomb-
Hartley-Moore-Hutchinson-Roberts-Hemphill-Oldham-Potter-Carson-
Gray-Wheeler-Deaf Smith-Randall-Armstrong-Donley-Collingsworth-
Palo Duro Canyon-
226 PM CDT Sun Jul 19 2020

This Hazardous Weather Outlook is for the Texas and Oklahoma
Panhandles.

.DAY ONE...This Afternoon and Tonight.

Isolated to scattered thunderstorms are expected across mainly the
northwest half of the combined Panhandles this afternoon and
tonight. A few storms will have the potential to become strong to
possibly severe, with large hail and gusty winds the primary
hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Thunderstorms will be possible across most of the Oklahoma and
Texas Panhandles Monday afternoon through Tuesday night, and then
across southern and western sections of the area Wednesday
evening. Most storms that develop are forecast to remain below
severe levels, though an isolated strong to severe storm cannot be
ruled out.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated at this time.

In the hours before

Special weather statement, Jul 19, 5:49 PM CDT, 1 hour 39 minutes before

Special Weather Statement
National Weather Service Amarillo TX
549 PM CDT Sun Jul 19 2020

TXZ017-018-317-192315-
Palo Duro Canyon TX-Randall TX-Armstrong TX-
549 PM CDT Sun Jul 19 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ARMSTRONG AND EAST
CENTRAL RANDALL COUNTIES UNTIL 615 PM CDT...

At 549 PM CDT, Doppler radar was tracking a strong thunderstorm 6
miles north of Palo Duro Canyon, or 15 miles southeast of Amarillo,
moving northeast at 10 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Washburn and Palo Duro Canyon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take shelter in a sturdy building if threatening weather approaches.

Conditions are favorable for the formation of weak tornadoes but the
threat posed by these tornadoes is low. If a weak tornado is
observed, move indoors and stay away from windows.

&&

LAT...LON 3489 10167 3508 10170 3518 10160 3518 10155
      3488 10140
TIME...MOT...LOC 2249Z 238DEG 9KT 3504 10163

Ward

Special weather statement, Jul 19, 6:07 PM CDT, 1 hour 21 minutes before

Special Weather Statement
National Weather Service Amarillo TX
607 PM CDT Sun Jul 19 2020

OKZ001-TXZ001-192330-
Cimarron OK-Dallam TX-
607 PM CDT Sun Jul 19 2020

...SIGNIFICANT WEATHER ADVISORY FOR CIMARRON AND NORTHEASTERN DALLAM
COUNTIES UNTIL 630 PM CDT...

At 607 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles northeast of Seneca to 9 miles east of
Felt. Movement was northeast at 10 mph.

Half inch hail and wind gusts of 50 to 55 mph will be possible with
these storms.

Locations impacted include...
Boise City, Keyes, Kenton, Wheeless, Black Mesa Park, Felt, Griggs
and Sturgis.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take shelter in a sturdy building if threatening weather approaches.

Heavy rainfall is also occurring with these storms, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3699 10203 3658 10204 3650 10214 3650 10216
      3648 10216 3625 10243 3655 10300 3700 10300
TIME...MOT...LOC 2307Z 210DEG 11KT 3671 10304 3655 10261

Ward

Local storm report, Jul 19, 7:07 PM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
707 PM CDT SUN JUL 19 2020

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

0625 PM     TSTM WND GST     3 SSE BOISE CITY        36.69N 102.50W
07/19/2020  M83 MPH          CIMARRON           OK   MESONET

&&

EVENT NUMBER AMA2000512

BEAT

Special weather statement, Jul 19, 7:21 PM CDT, 7 minutes before

Special Weather Statement
National Weather Service Amarillo TX
721 PM CDT Sun Jul 19 2020

TXZ007-008-200045-
Hutchinson TX-Moore TX-
721 PM CDT Sun Jul 19 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN HUTCHINSON AND
SOUTHEASTERN MOORE COUNTIES UNTIL 745 PM CDT...

At 721 PM CDT, Doppler radar was tracking a strong thunderstorm 4
miles west of Sanford, or 12 miles west of Borger, moving north at 20
mph.

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

Locations impacted include...
Fritch, Stinnett and Sanford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take shelter in a sturdy building if threatening weather approaches.

Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3564 10150 3566 10168 3592 10175 3590 10142
TIME...MOT...LOC 0021Z 182DEG 18KT 3573 10161

Ward

Special weather statement, Jul 19, 7:24 PM CDT, 4 minutes before

Special Weather Statement
National Weather Service Amarillo TX
724 PM CDT Sun Jul 19 2020

TXZ006-007-011-012-200100-
Hartley TX-Potter TX-Moore TX-Oldham TX-
724 PM CDT Sun Jul 19 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN OLDHAM...
NORTHWESTERN POTTER...SOUTHWESTERN MOORE AND SOUTHEASTERN HARTLEY
COUNTIES UNTIL 800 PM CDT...

At 723 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 9 miles west of Four Way to near Valley De Oro.
Movement was northeast at 10 mph.

Half inch hail and wind gusts of 50 to 55 mph will be possible with
these storms.

Locations impacted include...
Four Way, Masterson and Valley De Oro.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take shelter in a sturdy building if threatening weather approaches.

Conditions are favorable for the formation of weak tornadoes but the
threat posed by these tornadoes is low. If a weak tornado is
observed, move indoors and stay away from windows.

&&

LAT...LON 3588 10199 3535 10186 3535 10216 3576 10222
TIME...MOT...LOC 0023Z 223DEG 10KT 3571 10213 3543 10208

Ward

Special weather statement, Jul 19, 7:28 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Amarillo TX
728 PM CDT Sun Jul 19 2020

TXZ004-005-009-010-200100-
Hemphill TX-Ochiltree TX-Roberts TX-Lipscomb TX-
728 PM CDT Sun Jul 19 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN LIPSCOMB...
NORTHEASTERN ROBERTS...NORTHWESTERN HEMPHILL AND SOUTHEASTERN
OCHILTREE COUNTIES UNTIL 800 PM CDT...

At 727 PM CDT, Doppler radar was tracking a strong thunderstorm 17
miles northwest of Lora, or 17 miles northwest of Miami. This storm
was nearly stationary. Another storm was about 10 miles south of
Wolf Creek Park moving northeast at 15 mph.

Dime size hail and wind gusts of 50 to 55 mph will be possible with
these storms.

Locations impacted include...
Wolf Creek Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take shelter in a sturdy building if threatening weather approaches.

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3583 10075 3588 10083 3597 10088 3624 10063
      3625 10054 3617 10043 3601 10042 3592 10054
TIME...MOT...LOC 0027Z 233DEG 2KT 3593 10077

Ward

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 7:02 PM CDT	Areal Flood Advisory	AMA	Dallam	3 hr
Jul 19, 7:18 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley, Sherman	72 min
Jul 19, 7:21 PM CDT	Special Weather Statement	AMA	Hutchinson	24 min
Jul 19, 7:24 PM CDT	Special Weather Statement	AMA	Potter	36 min
Jul 19, 7:41 PM CDT	Special Weather Statement	AMA	Oldham	34 min
Jul 19, 7:56 PM CDT	Severe Thunderstorm Warning	AMA	Roberts	34 min
Jul 19, 8:02 PM CDT	Areal Flood Advisory	AMA	Roberts	3 hr
Jul 19, 8:12 PM CDT	Severe Thunderstorm Warning	AMA	Ochiltree, Roberts	19 min
Jul 19, 8:19 PM CDT	Severe Thunderstorm Warning	AMA	Hansford, Sherman	32 min
Jul 19, 8:35 PM CDT	Special Weather Statement	AMA	Hartley	25 min
Jul 19, 8:47 PM CDT	Special Weather Statement	AMA	Hartley	43 min
Jul 19, 8:54 PM CDT	Special Weather Statement	AMA	Roberts	36 min
Jul 19, 9:12 PM CDT	Special Weather Statement	AMA	Oldham	48 min
Jul 19, 10:04 PM CDT	Special Weather Statement	AMA	Potter, Randall	56 min
Jul 20, 2:44 PM CDT	Special Weather Statement	AMA	Donley	31 min
Jul 20, 2:56 PM CDT	Special Weather Statement	AMA	Wheeler	34 min
Jul 20, 3:06 PM CDT	Special Weather Statement	AMA	Gray	24 min
Jul 20, 3:31 PM CDT	Severe Thunderstorm Warning	AMA	Donley, Gray	29 min
Jul 20, 3:34 PM CDT	Special Weather Statement	AMA	Wheeler	26 min
Jul 20, 4:07 PM CDT	Special Weather Statement	AMA	Hemphill	23 min
Jul 19, 8:48 PM CDT	Special Weather Statement	AMA	Beaver	42 min
Jul 19, 10:54 PM CDT	Special Weather Statement	AMA	Beaver	66 min
Jul 20, 6:37 PM CDT	Severe Thunderstorm Warning	AMA	Cimarron	38 min

Nearby

Special Weather Statements in Texas, 2020 Every special weather statement 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.