Alert archive / Texas / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 829, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 19, 2017, 3:44 PM CDT for Clay County, Texas. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 19, 2017, 3:44 PM CDT (20:44 UTC)
- Expired
- Aug 19, 2017, 4:30 PM CDT
- In force
- 46 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Clay County, TX
The radar
The Altus AFB radar (KFDR), 95 km from the middle of the area, began a volume at 20:47 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, 8.7 hours before the alert went out and 358 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.
- Mixed-layer CAPE
- 691 J/kg
- Mixed-layer CIN
- -122 J/kg
- Mixed-layer LCL
- 1767 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -17 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 19, 2:23 PM CDT, 1 hour 21 minutes earlier.
Area forecast discussion, Aug 19, 2:23 PM CDT, 1 hour 21 minutes before
Area Forecast Discussion
National Weather Service Norman OK
223 PM CDT Sat Aug 19 2017
.DISCUSSION...
&&
.PREV DISCUSSION... /issued 116 PM CDT Sat Aug 19 2017/
DISCUSSION...
The extreme heat and humidity could abate slightly Sunday as
models indicated slightly less surface moisture. For the time
being, a heat advisory is not expected for tomorrow, but that
could change. Otherwise, the upper high pressure that is over the
southern plains is forecast to move a bit westward allowing weak
influence of the westerlies into Oklahoma by Tuesday. An upper
trough through the Missouri Valley Tuesday is expected to push a
surface front into Oklahoma Tuesday night bringing a good chance
for rain and thunder across the state Tuesday night and in the
southern half of Oklahoma Wednesday. Less hot weather will follow.
Another upper system is expected from the west on Friday again
bringing good rain and thunderstorm chances. Rain chances could
last into the weekend with still modest influence from northwest
flow.
AVIATION...
VFR conditions are expected with cumulus developing through the
afternoon. Isolated thunderstorms are possible in the southwest
quarter of Oklahoma and southward. Southwest wind will mostly
remain under 12 knots.
PREV DISCUSSION... /issued 1147 AM CDT Sat Aug 19 2017/
UPDATE...
Modified POPs and recalculated hourly grids in general.
DISCUSSION...
The small showers over northern Oklahoma have dissipated, and have
removed the POPs and weather north. CAMs still suggest somewhat
higher chances in the south so have focused the POPs south.
Meanwhile after recent rains, now we have the humidity. Dewpoints
are currently at the 95th percentile for mid-August at Oklahoma
City and Wichita Falls, and 99th percentile at Ponca City. And as
we get back into the warm August weather, heat index values are
expected to be quite high. The heat advisory still looks good for
heat index of 105 to 110.
&&
.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK 75 97 73 93 / 10 10 0 0
Hobart OK 76 98 73 95 / 10 10 10 10
Wichita Falls TX 76 98 74 95 / 10 10 0 0
Gage OK 72 96 73 93 / 10 20 10 20
Ponca City OK 77 98 75 94 / 10 10 20 20
Durant OK 77 96 74 92 / 10 10 0 10
&&
.OUN WATCHES/WARNINGS/ADVISORIES...
OK...Heat Advisory until 7 PM CDT this evening for OKZ007-008-012-013-
018>020-024>026-028>032-040-042-043-048.
TX...None.
&&
26/09Hazardous weather outlook, Aug 19, 11:48 AM CDT, 3 hours 56 minutes before
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</html>In the hours before
Special weather statement, Aug 19, 2:30 PM CDT, 1 hour 14 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 230 PM CDT SAT AUG 19 2017 TXZ089-090-192000- Clay TX-Archer TX- 230 PM CDT SAT AUG 19 2017 ...SIGNIFICANT WEATHER ADVISORY FOR southwestern Clay and southeastern Archer Counties Until 300 PM CDT... AT 228 PM CDT, a strong thunderstorm was located 6 miles southeast of Archer City, moving northeast at 10 MPH. HAZARDS INCLUDE... Hail up to one-half inch diameter... Wind gusts to 40 MPH... LAT...LON 3342 9852 3342 9877 3373 9852 3354 9829 TIME...MOT...LOC 1928Z 225DEG 9KT 3351 9856 ..speg.
Special weather statement, Aug 19, 3:32 PM CDT, 12 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 332 PM CDT SAT AUG 19 2017 TXZ090-192100- Clay TX- 332 PM CDT SAT AUG 19 2017 ...SIGNIFICANT WEATHER ADVISORY FOR southwestern Clay County Until 400 PM CDT... AT 329 PM CDT, strong thunderstorms were located 5 miles south of Bluegrove and 8 miles southeast of Windthorst, moving northeast at 15 MPH. HAZARDS INCLUDE... Hail up to the size of nickels... Wind gusts to 50 MPH... LAT...LON 3347 9842 3368 9842 3375 9806 3346 9816 TIME...MOT...LOC 2029Z 233DEG 14KT 3360 9825 3348 9835 ..speg.
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 3:43 AM CDT | Heat Advisory | OUN | Atoka, Canadian, Cleveland, Coal, Garfield, Garvin and 13 more | 15 hr |
| Aug 19, 4:42 PM CDT | Special Weather Statement | OUN | Jefferson | 33 min |
| Aug 19, 5:43 PM CDT | Special Weather Statement | OUN | Carter | 32 min |
| Aug 19, 2:30 PM CDT | Special Weather Statement | OUN | Archer | 30 min |
| Aug 19, 3:32 PM CDT | Special Weather Statement | OUN | Clay | 28 min |
| Aug 19, 6:29 PM CDT | Special Weather Statement | OUN | Foard | 31 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2017Every severe thunderstorm warning in 2017
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.