A plume of monsoon moisture extended across the region and thunderstorms were ongoing in the morning of the 4th due to an Mesoscale Convective Vortex (MCV) moving southeast from the northeast Texas Panhandle into western Oklahoma. An upper level short wave moving south through western Kansas along with a surface trough across northeast New Mexico into the western Oklahoma Panhandle helped to…
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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.
The episode as NWS AMA wrote it up.
A plume of monsoon moisture extended across the region and thunderstorms were ongoing in the morning of the 4th due to an Mesoscale Convective Vortex (MCV) moving southeast from the northeast Texas Panhandle into western Oklahoma. An upper level short wave moving south through western Kansas along with a surface trough across northeast New Mexico into the western Oklahoma Panhandle helped to spark additional showers and thunderstorms in the northwest during the afternoon hours. Thunderstorms, some severe, and some with excessive rainfall developed across the western Oklahoma Panhandle and the northwest Texas Panhandle during the mid afternoon given moderate instability in the area. These thunderstorms moved south-southwest across the western Panhandles. Hail up to 2 inches in diameter and flooding was reported near Dalhart. Winds up to 78 mph were reported at the Boise City mesonet station and severe wind gusts were also reported at several other ASOS ad mesonet stations across the area. Additional thunderstorms with damaging winds developed after midnight across the south central and southwest Texas Panhandle and moved southwest.
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 Jul 4, 12:46 PM CST, 2 hours 52 minutes earlier.
Area Forecast Discussion National Weather Service Amarillo TX 146 PM CDT Sun Jul 4 2021 .SHORT TERM... Cluster of thunderstorms in the southeast Texas Panhandle should exit the area by late this afternoon. These storms have aided by a short wave trough moving southeast into western Oklahoma. The main area of showers and thunderstorms are expected to develop near the Raton Mesa and off the mountains of southern Colorado and northern New Mexico. These storms will be moving into an environment of increasing instability and shear as interact with a short wave trough moving through western Kansas. These storms may be discrete at first and some may be supercells across the northwest CWA, before they form into a line later this evening and move southeast through the rest of the Panhandles. Large hail and damaging winds will be the main threats from these storms. A landspout tornado can not be ruled out. Heavy rain from these storms may also cause localized areas of flooding. Thunderstorms will again be possible on Monday, mainly across the western areas. The northerly flow aloft will tend to mitigate the eastward progression of any mountain convection. There are a couple of minor short wave troughs moving through the flow that may also tough off a few showers and storms. Highs on Monday will still remain below normal with readings mainly in the 80's. && .LONG TERM...Tuesday through Saturday... An upper high will continue to spin over the Great Basin Region with northwesterly flow aloft for the Panhandles. By Wednesday night into Thursday, the high shifts slightly east towards the Four Corners and puts the Panhandles in northeasterly flow aloft for a brief period. By Friday the high heads back towards the Great Basin Region as a trough digs down into the Upper Midwest with northwesterly flow returning aloft through the weekend. With embedded shortwaves and south southeasterly winds at the surface continuing to provide 60s dewpoints, precipitation chances continue Tuesday and Wednesday, then halt Thursday before returning again through the weekend. The best chance for severe weather will be on Tuesday with the greatest instability present and a more defined shortwave to potentially ramp up storms later through the evening. MLCAPE values are around 1000-2000 J/kg with 0-6 km effective bulk shear around 20-25 knots so large hail and damaging wind gusts are possible. As the evening goes on, there is a potential for storms to become more linear with a surface trough. By Wednesday, the instability parameters do not look as good and the chance for severe storms becomes less likely. However, strong thunderstorms are still a possibility with another surface trough to help enhance storm development. Thursday will remain dry before precipitation chances return for the weekend. A weak frontal passage late Friday night may keep the precipitation chances continuing into Saturday morning. Temperatures will remain in the 80s Tuesday and Wednesday before warming a bit into the lower 90s Thursday and Friday. Breezy southwest winds are possible Friday with daytime mixing of 25-30 knot 850mb winds extending across the Panhandles. North winds will follow behind the weak front late Friday night and this will keep temperatures from warming above the upper 80s to lower 90s into the weekend. Rutt && .PRELIMINARY POINT TEMPS/POPS... Amarillo TX 66 82 66 83 66 / 60 40 30 30 50 Beaver OK 66 87 67 88 66 / 50 10 5 10 50 Boise City OK 61 85 63 84 61 / 40 20 20 50 70 Borger TX 69 87 70 88 69 / 70 30 20 20 50 Boys Ranch TX 66 87 67 87 67 / 60 40 30 30 60 Canyon TX 66 82 66 82 65 / 60 50 30 30 50 Clarendon TX 67 82 67 83 67 / 60 50 20 20 30 Dalhart TX 62 85 63 83 62 / 60 30 20 40 70 Guymon OK 64 87 66 88 65 / 60 20 10 30 60 Hereford TX 66 86 66 85 65 / 80 50 40 40 60 Lipscomb TX 67 85 67 87 67 / 50 40 5 10 30 Pampa TX 66 83 67 84 66 / 70 40 20 20 40 Shamrock TX 68 83 67 85 67 / 40 50 10 10 20 Wellington TX 68 84 68 86 68 / 40 50 20 10 20 && .AMA Watches/Warnings/Advisories... TX...None. OK...None. && 15/23
Hazardous Weather Outlook...UPDATED National Weather Service Amarillo TX 353 PM CDT Sun Jul 4 2021 OKZ001>003-TXZ001>020-317-051100- 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- 353 PM CDT Sun Jul 4 2021 This Hazardous Weather Outlook is for the Texas and Oklahoma Panhandles. .DAY ONE...This Afternoon and Tonight. Thunderstorms are possible across the Texas and Oklahoma Panhandles this afternoon and tonight. Some storms may become severe with large hail and damaging winds being the main threats. A Severe Thunderstorm Watch is in effect for all of the Oklahoma Panhandle and most of the Texas Panhandle until 11 PM CDT this evening. Heavy rain may also lead to localized flooding or flash flooding. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Thunderstorms remain possible Monday through Wednesday and again Friday night into Saturday across much of the Panhandles. A severe storm cannot be ruled out on Tuesday. Storms could be capable of heavy rain leading to localized flooding or flash flooding Monday and Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation is likely through tonight.
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
LGSpecial Weather Statement
National Weather Service Amarillo TX
1234 PM CDT Sun Jul 4 2021
TXZ014-015-019-041815-
Gray TX-Wheeler TX-Donley TX-
1234 PM CDT Sun Jul 4 2021
...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL WHEELER...GRAY AND
NORTH CENTRAL DONLEY COUNTIES UNTIL 115 PM CDT...
At 1234 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles southwest of Lefors, or 11 miles south of Pampa, moving
southeast at 20 mph.
Penny size hail and wind gusts of 50 to 55 mph will be possible with
this storm.
Locations impacted include...
Mclean, Lefors, Lake Mcclellan, Alanreed and Kellerville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Take shelter in a sturdy building if threatening weather approaches.
&&
LAT...LON 3539 10109 3542 10109 3553 10088 3535 10044
3502 10089
TIME...MOT...LOC 1734Z 304DEG 16KT 3539 10092
LGSpecial Weather Statement
National Weather Service Amarillo TX
242 PM CDT Sun Jul 4 2021
OKZ001-TXZ001-002-042030-
Cimarron OK-Sherman TX-Dallam TX-
242 PM CDT Sun Jul 4 2021
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN CIMARRON...WESTERN
SHERMAN AND NORTHEASTERN DALLAM COUNTIES UNTIL 330 PM CDT...
At 242 PM CDT, Doppler radar was tracking a strong thunderstorm 12
miles southwest of Griggs, or 12 miles northwest of Stratford, moving
east at 15 mph.
Nickel size hail and wind gusts of 50 to 55 mph will be possible with
this storm.
Locations impacted include...
Stratford, Conlen and Texhoma.
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.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 3652 10203 3650 10203 3650 10192 3648 10174
3610 10198 3630 10248 3655 10233
TIME...MOT...LOC 1942Z 275DEG 11KT 3646 10225
LGSpecial Weather Statement National Weather Service Amarillo TX 313 PM CDT Sun Jul 4 2021 TXZ001-002-042045- Sherman TX-Dallam TX- 313 PM CDT Sun Jul 4 2021 ...SIGNIFICANT WEATHER ADVISORY FOR WESTERN SHERMAN AND EASTERN DALLAM COUNTIES UNTIL 345 PM CDT... At 313 PM CDT, Doppler radar was tracking a strong thunderstorm 9 miles north of Conlen, or 12 miles west of Stratford, moving southeast at 15 mph. Nickel size hail and wind gusts of 50 to 55 mph will be possible with this storm. Locations impacted include... Stratford and Conlen. 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. This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. && LAT...LON 3650 10253 3650 10212 3606 10184 3606 10243 TIME...MOT...LOC 2013Z 327DEG 13KT 3637 10229 LG
Special Weather Statement National Weather Service Amarillo TX 347 PM CDT Sun Jul 4 2021 OKZ001-002-042115- Cimarron OK-Texas OK- 347 PM CDT Sun Jul 4 2021 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN TEXAS AND SOUTHEASTERN CIMARRON COUNTIES UNTIL 415 PM CDT... At 347 PM CDT, Doppler radar was tracking a strong thunderstorm 4 miles northeast of Griggs, or 20 miles north of Stratford, moving southeast at 30 mph. Dime size hail and wind gusts of 50 to 55 mph will be possible with this storm. Locations impacted include... Texhoma and Griggs. 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. && A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for the Panhandle of Oklahoma...and the Panhandle of Texas. LAT...LON 3650 10164 3650 10210 3661 10220 3681 10204 TIME...MOT...LOC 2047Z 309DEG 27KT 3663 10206 LG
The Amarillo radar (KAMA), 118 km away, was scanning. The volume nearest the first event began at 21:36 UTC.
6 hail, 6 thunderstorm wind, 1 flood. Local standard time, as filed.
Street flooding was reported in and around the city of Dalhart. Roads did remain passible.
Storm chaser reported 1-2 inch diameter hail in and around Dalhart to around 5 miles north of town. Some minor accumulating hail was reported on highway 385, about 4 miles north of the city as well.
Report received of 1 to 1.5 inch hail falling for around 2 minutes.
Hail up to 2 inches broke storm chaser's windshield.
Multiple gusts in excess of 58 mph were measured by a mesonet. Maximum wind gust of 69 mph occurred at 1928 CDT.
A roof was taken off of a front porch. Also a heavy duty swing-set was blown over and several tree limbs were blown down.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2021Every state in 2021This day in weather historyWarnings in Texas, July 2021
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: 973363, 973364, 973365, 973366, 973367, 973369, 973371, 973372, 973373, 973370, 974113, 974115, 974114.