Hail in Oklahoma, August 21, 2021

Name: Hail in Oklahoma, August 21, 2021
Start: 2021-08-21T16:10
End: 2021-08-21T16:55
Location: Oklahoma

August 21, 2021 · NWS AMA · 3 events in 1 county or zone

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 3

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS AMA wrote it up.

A stationary front extended from a low near Amarillo east northeast to just south of Canadian, TX in the afternoon. The lower levels of the atmosphere were moistening from southeast surface winds into the stationary front and the edge of the southwest United States monsoon moisture plume was also present across the area. Weak to moderate instability was found along and behind the front along with weak wind shear which was greatest in the far northern Panhandles and into Kansas. Thunderstorms initially developed near Amarillo around 2 pm as a weak upper level disturbance passed through the area. These storms were slow-moving and they were interacting with outflow boundaries. Some severe storms trained along and outflow boundary collision across the western side of Amarillo causing flooding. In addition, a couple of storms with large hail (up to 2 inches in diameter) moved northward across Lipscomb and Beaver Counties during the late afternoon/early evening where the better dynamics and wind shear were located.

What forecasters said that day

The local office's own words before the first event, 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 the first event at Aug 21, 12:10 PM CST, 4 hours earlier.

Area forecast discussion, Aug 21, 12:10 PM CST, 4 hours before

Area Forecast Discussion
National Weather Service Amarillo TX
110 PM CDT Sat Aug 21 2021

.SHORT TERM...
A surface low near Canyon TX had a stationary front extended
northeast to the east central Texas Panhandle.  This stationary
front is expected to be the focus for initial thunderstorm
development.  Southwest flow aloft should carry the storms to the
northeast.  Some of the storms may become severe with large hail and
damaging winds.  Heavy rain may cause localized flooding.
Thunderstorms will likely move out of our area or dissipate toward
midnight.

A thunderstorm will be possible across the northwest CWA on Sunday
afternoon or evening. But will decide at the last minute on whether
to insert this into the forecast.  Not all models agree that there
will be a thunderstorm in the northwest, so confidence is not very
high at this time.

Highs on Sunday will be close to a little above normal with readings
in the upper 80's to the mid 90's.

&&

.LONG TERM...Monday through Friday

Upper high builds over the southern Plains states Monday through
Thursday and should keep a dry pattern across the Panhandles. A
shortwave trough over the southern Rockies late next week as the
upper high breaks down will allow for the possibility of
convection by late Friday and Friday night. The GFS hinting at the
possibility for convection as early as Thursday afternoon and
Thursday night mainly across the western or northwestern portions
of the forecast area with the shortwave trough.

Surface low over eastern Colorado and western Kansas Monday
through Wednesday will deepen and allow for tightening of the
surface pressure gradient resulting in gusty southerly to
southwesterly winds. Surface low late next week across the central
Plains states and central Rockies with surface trough extending
south into New Mexico Thursday into Friday. Warmer and drier
conditions expected next week with a few breezy to windy days.

Schneider

&&

.PRELIMINARY POINT TEMPS/POPS...
Amarillo TX                68  92  69  96  70 /  30   5   0   0   0
Beaver OK                  66  95  72 100  73 /  40   5   0   0   0
Boise City OK              62  93  66  96  66 /  10   5   0   5   0
Borger TX                  71  96  73 100  74 /  30   5   0   0   0
Boys Ranch TX              68  93  70  97  71 /  20   5   0   0   0
Canyon TX                  67  90  68  94  68 /  20   5   0   0   0
Clarendon TX               70  92  71  95  71 /  30   0   0   0   0
Dalhart TX                 62  91  65  95  65 /  20   5   5   5   0
Guymon OK                  65  95  70  99  71 /  20   5   0   5   0
Hereford TX                67  91  67  95  68 /  20   5   0   0   0
Lipscomb TX                67  93  71  97  72 /  40   5   0   0   0
Pampa TX                   67  92  70  96  71 /  30   5   0   0   0
Shamrock TX                69  93  69  97  69 /  30   0   0   0   0
Wellington TX              70  95  69  98  70 /  20   0   0   0   0

&&

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

&&

15/11

Hazardous weather outlook, Aug 21, 12:14 PM CST, 3 hours 56 minutes before

Hazardous Weather Outlook
National Weather Service Amarillo TX
114 PM CDT Sat Aug 21 2021

OKZ001>003-TXZ001>020-317-221100-
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-
114 PM CDT Sat Aug 21 2021

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

.DAY ONE...This Afternoon and Tonight.

Storms expected through tonight across much of the Texas and
Oklahoma Panhandles. Storms may be severe with hail and damaging
winds as the main threats.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated at this time.

Schneider

In the hours before

Local storm report, Aug 21, 3:16 PM CST, 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
416 PM CDT SAT AUG 21 2021

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

0409 PM     FLOOD            5 W AMARILLO            35.19N 101.90W
08/21/2021                   POTTER             TX   STORM CHASER

            HEAVY FLOODING UNDER THE BRIDGE AT I-40 AND
            BELL WITH TRAFFIC AT A STANDSTILL IN THE
            WEST BOUND LANE.

&&

KR

Local storm report, Aug 21, 3:39 PM CST, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
439 PM CDT SAT AUG 21 2021

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

0436 PM     FLASH FLOOD      7 WSW AMARILLO          35.15N 101.92W
08/21/2021                   RANDALL            TX   TRAINED SPOTTER

            ROAD CLOSED FROM 45TH TO HILLSIDE ON COULTER
            WITH 3-4 FEET OF WATER. FIREFIGHTERS ARE
            PERFORMING MULTIPLE HIGH WATER RESCUES WITH
            MULTIPLE VEHICLES STRANDED.

&&

KR

Local storm report, Aug 21, 3:44 PM CST, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
444 PM CDT SAT AUG 21 2021

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

0409 PM     FLOOD            4 WNW AMARILLO          35.22N 101.89W
08/21/2021                   POTTER             TX   PUBLIC

            WATER FILLING UP WEST HILL PARK WITH SOME
            ROADS AROUND THE PARK POTENTIALLY
            IMPASSABLE.

&&

KR

Special weather statement, Aug 21, 3:44 PM CST, 26 minutes before

Special Weather Statement
National Weather Service Amarillo TX
444 PM CDT Sat Aug 21 2021

OKZ001-002-TXZ001>003-212245-
Cimarron OK-Texas OK-Sherman TX-Dallam TX-Hansford TX-
444 PM CDT Sat Aug 21 2021

...A strong thunderstorm will impact portions of southwestern Texas,
southeastern Cimarron, southwestern Hansford, Sherman and
northeastern Dallam Counties through 545 PM CDT...

At 444 PM CDT, Doppler radar was tracking a strong thunderstorm 12
miles southeast of Stratford, moving northwest at 40 mph.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Stratford, Griggs and Texhoma.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3607 10151 3605 10176 3606 10196 3654 10238
      3668 10179
TIME...MOT...LOC 2144Z 151DEG 35KT 3624 10188

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

LG

Local storm report, Aug 21, 4:03 PM CST, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
503 PM CDT SAT AUG 21 2021

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

0456 PM     HAIL             1 S BOOKER              36.43N 100.54W
08/21/2021  M1.75 INCH       LIPSCOMB           TX   STORM CHASER

            SOCIAL MEDIA REPORT OF GOLF BALL SIZED HAIL.

&&

KR

Local storm report, Aug 21, 4:08 PM CST, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
508 PM CDT SAT AUG 21 2021

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

0445 PM     HAIL             BOOKER                  36.46N 100.54W
08/21/2021  M1.75 INCH       LIPSCOMB           TX   PUBLIC

            PUBLIC REPORTS ON SOCIAL MEDIA QUARTER TO
            GOLF BALL SIZE HAIL.

&&

KR

The radar

The Dodge City radar (KDDC), 137 km away, was scanning. The volume nearest the first event began at 22:09 UTC.

Open the radar archive at this moment

Event by event

3 hail. Local standard time, as filed.

Hail, Beaver

When: August 21, 4:10 PM CST
Where: Beaver County, 0.69 mi S of Elmwood
Measured: 1 in hail
Reported by: Emergency Manager
Coordinates: 36.610, -100.520

Hail, Beaver

When: August 21, 4:25 PM CST
Where: Beaver County, 2.76 mi N of Elmwood
Measured: 1.5 in hail
Reported by: Emergency Manager
Coordinates: 36.660, -100.520

Hail, Beaver

When: August 21, 4:55 PM CST
Where: Beaver County, 1.49 mi NNW of Boyd
Measured: 1.75 in hail
Reported by: Emergency Manager
Coordinates: 36.720, -100.830

What these are

Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Oklahoma in 2021 Every state in 2021 This day in weather history Warnings in Oklahoma, August 2021

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 977673, 977674, 977675.