Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 615, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jul 30, 2020, 9:15 PM CDT for Caddo County, Oklahoma. It was in force for 28 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
- Jul 30, 2020, 9:15 PM CDT (02:15 UTC)
- Expired
- Jul 30, 2020, 9:43 PM CDT
- In force
- 28 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Caddo County, OK
The radar
The Norman radar (KTLX), 101 km from the middle of the area, began a volume at 02:15 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 30, 4:35 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Fort Worth, TX (KFWD), launched 00:00Z, 2.3 hours before the alert went out and 279 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
- 1104 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 2261 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 151 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.8
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 Jul 30, 6:53 PM CDT, 2 hours 22 minutes earlier.
Area forecast discussion, Jul 30, 6:53 PM CDT, 2 hours 22 minutes before
Area Forecast Discussion National Weather Service Norman OK 653 PM CDT Thu Jul 30 2020 ...New AVIATION... .SHORT TERM... (This evening through Friday) Issued at 227 PM CDT Thu Jul 30 2020 Showers/thunderstorms are likely to develop across southwestern OK and western north TX this afternoon and evening a mid-level trough and surface boundary. Latest radar imagery shows a few echoes with a few cloud flashes already developing over Beckham County in western OK and tracking quickly east-southeastward at about 40 mph. With a moderately unstable atmosphere in place, little to no CIN, storms may become severe later this afternoon and evening. Large hail up to the size of golf balls, damaging winds, and heavy rainfall are possible with any storms that develop. A few thunderstorms are also possible this evening over northern Oklahoma. Precipitation appears likely, generally south of I-40, through at least 10PM with chances diminishing after midnight. && .LONG TERM... (Friday night through next Wednesday) Issued at 220 PM CDT Thu Jul 30 2020 In the wake of Friday's storm system, we should see a break from rain this weekend with below normal temperatures. Models (both deterministic and ensemble) are trending further west with their possible MCS Sunday night into Monday, affecting mainly the panhandles and parts of western Oklahoma into north Texas. Latest NBM guidance seems to represent this fairly well. The most recent WPC cluster analysis is coming in weaker and slower with the building of the upper level ridge next week. This is consistent with deterministic models which keep us in an active northwest flow pattern through much of next week. Day && .AVIATION... (00Z TAFS) Issued at 647 PM CDT Thu Jul 30 2020 Showers and storms will continue to develop across southern Oklahoma and north Texas through the evening, slowly making their way southeast. Damaging winds will be possible with these storms. Outside of this convection, breezy northerly winds will prevail. Day && .PRELIMINARY POINT TEMPS/POPS... Oklahoma City OK 69 82 66 84 / 40 30 0 0 Hobart OK 69 87 64 89 / 30 10 0 0 Wichita Falls TX 71 88 66 89 / 60 10 0 0 Gage OK 64 85 60 88 / 20 10 0 0 Ponca City OK 69 81 64 83 / 60 40 0 0 Durant OK 73 88 68 89 / 60 30 10 0 && .OUN WATCHES/WARNINGS/ADVISORIES... OK...None. TX...None. && SHORT TERM...01 LONG TERM....14 AVIATION...14
Hazardous weather outlook, Jul 30, 8:48 PM CDT, 27 minutes before
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Local storm report, Jul 30, 8:10 PM CDT, 1 hour 5 minutes before
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</html>Local storm report, Jul 30, 9:11 PM CDT, 4 minutes before
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</html>The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 7:06 PM CDT | Severe Thunderstorm Warning | OUN | Atoka, Carter, Coal, Johnston, Marshall, Murray and 1 more | 39 min |
| Jul 30, 7:10 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Cotton, Jefferson, Stephens, Tillman | 50 min |
| Jul 30, 7:24 PM CDT | Flash Flood Warning | OUN | Coal, Hughes, Pontotoc | 3 hr |
| Jul 30, 7:37 PM CDT | Areal Flood Advisory | OUN | Pontotoc | 3 hr |
| Jul 30, 7:37 PM CDT | Severe Thunderstorm Warning | OUN | Atoka, Bryan, Carter, Coal, Hughes, Johnston and 3 more | 53 min |
| Jul 30, 7:39 PM CDT | Flash Flood Warning | OUN | Atoka | 3 hr |
| Jul 30, 7:44 PM CDT | Areal Flood Advisory | OUN | Stephens | 3 hr |
| Jul 30, 7:53 PM CDT | Areal Flood Advisory | OUN | Cotton | 3 hr |
| Jul 30, 7:59 PM CDT | River Flood Warning | OUN | Grant, Kay, Noble | 18 hr |
| Jul 30, 8:08 PM CDT | Special Weather Statement | OUN | Jefferson | 52 min |
| Jul 30, 8:25 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche, Kiowa | 50 min |
| Jul 30, 11:33 PM CDT | Special Weather Statement | OUN | Comanche, Cotton | 42 min |
| Jul 31, 12:16 AM CDT | Special Weather Statement | OUN | Comanche, Cotton | 44 min |
| Jul 31, 12:39 AM CDT | Severe Thunderstorm Warning | OUN | Comanche, Cotton | 51 min |
| Jul 31, 1:26 AM CDT | Special Weather Statement | OUN | Cotton | 49 min |
| Jul 31, 2:48 AM CDT | Special Weather Statement | OUN | Carter | 27 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2020Every severe thunderstorm warning 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.