Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 470, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jul 17, 2018, 10:30 PM CDT for Alfalfa County, Woods County, Woodward County, Oklahoma. It was in force for 45 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 17, 2018, 10:30 PM CDT (03:30 UTC)
- Expired
- Jul 17, 2018, 11:15 PM CDT
- In force
- 45 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Alfalfa County, OK, Woods County, OK, Woodward County, OK
The radar
The Vance AFB radar (KVNX), 63 km from the middle of the area, began a volume at 03:34 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, 3.5 hours before the alert went out and 158 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
- 1389 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 1710 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- 152 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 17, 9:24 PM CDT, 1 hour 6 minutes earlier.
Area forecast discussion, Jul 17, 9:24 PM CDT, 1 hour 6 minutes before
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Special weather statement, Jul 17, 7:36 PM CDT, 2 hours 54 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 736 PM CDT TUE JUL 17 2018 OKZ004-180115- Harper OK- 736 PM CDT TUE JUL 17 2018 ...SIGNIFICANT WEATHER ADVISORY FOR southwestern Harper County Until 815 PM CDT.... AT 734 PM CDT, a strong thunderstorm was located 6 miles northeast of Slapout, moving east at 15 MPH. HAZARDS INCLUDE... Wind gusts over 50 MPH... Heavy rain can lead to reduced visibility... Frequent cloud to ground lightning... Locations impacted include... Laverne and Rosston. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the weather situation closely and be alert for threatening weather conditions. && LAT...LON 3681 10000 3685 9990 3659 9983 3659 10000 TIME...MOT...LOC 0034Z 258DEG 12KT 3669 10004 03
Special weather statement, Jul 17, 8:54 PM CDT, 1 hour 36 minutes before
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Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 7:36 PM CDT | Special Weather Statement | OUN | Harper | 39 min |
| Jul 17, 7:59 PM CDT | Severe Thunderstorm Warning | OUN | Ellis, Harper | 61 min |
| Jul 17, 8:54 PM CDT | Special Weather Statement | OUN | Harper | 36 min |
| Jul 17, 9:28 PM CDT | Special Weather Statement | OUN | Woods, Woodward | 47 min |
| Jul 17, 9:47 PM CDT | Severe Thunderstorm Warning | OUN | Harper, Woods, Woodward | 43 min |
| Jul 17, 11:11 PM CDT | Special Weather Statement | OUN | Garfield, Grant | 34 min |
| Jul 17, 11:18 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Garfield, Grant | 42 min |
| Jul 17, 11:53 PM CDT | Areal Flood Advisory | OUN | Alfalfa, Grant | 112 min |
| Jul 18, 12:03 AM CDT | Special Weather Statement | OUN | Grant | 27 min |
| Jul 18, 12:43 AM CDT | Special Weather Statement | OUN | Kay | 32 min |
| Jul 18, 4:01 AM CDT | Heat Advisory | OUN | Atoka, Bryan, Caddo, Canadian, Carter, Cleveland and 30 more | 15 hr |
| Jul 18, 4:59 PM CDT | Heat Advisory | OUN | Alfalfa, Atoka, Beckham, Blaine, Bryan, Caddo and 42 more | 52 hr |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2018Every severe thunderstorm warning in 2018
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.