Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 476, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Sep 3, 2021, 3:07 PM CDT for Ellis County, Harper County, Oklahoma. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 3, 2021, 3:07 PM CDT (20:07 UTC)
- Expired
- Sep 3, 2021, 3:45 PM CDT
- In force
- 38 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Ellis County, OK, Harper County, OK
The radar
The Dodge City radar (KDDC), 121 km from the middle of the area, began a volume at 20:08 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 12:00Z, 8.1 hours before the alert went out and 121 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
- 885 J/kg
- Mixed-layer CIN
- -100 J/kg
- Mixed-layer LCL
- 1122 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 117 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.1
The text
As transmitted.
629
WUUS54 KOUN 032007
SVROUN
OKC045-059-032045-
/O.NEW.KOUN.SV.W.0476.210903T2007Z-210903T2045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
307 PM CDT Fri Sep 3 2021
The National Weather Service in Norman has issued a
* Severe Thunderstorm Warning for...
Northwestern Ellis County in northwestern Oklahoma...
Southwestern Harper County in northwestern Oklahoma...
* Until 345 PM CDT.
* At 306 PM CDT, a severe thunderstorm was located near Laverne,
moving east at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Laverne and May.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 3678 9973 3658 9969 3656 10000 3670 10001
TIME...MOT...LOC 2006Z 249DEG 12KT 3665 9992
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ware1 follow-up statement
460
WWUS54 KOUN 032025
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
325 PM CDT Fri Sep 3 2021
OKC045-059-032045-
/O.CON.KOUN.SV.W.0476.000000T0000Z-210903T2045Z/
Ellis OK-Harper OK-
325 PM CDT Fri Sep 3 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM CDT
FOR NORTH CENTRAL ELLIS AND SOUTHWESTERN HARPER COUNTIES...
At 324 PM CDT, a severe thunderstorm was located 3 miles south of
Laverne, moving east at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
May.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 3657 9991 3668 9992 3675 9972 3658 9969
TIME...MOT...LOC 2024Z 249DEG 12KT 3667 9985
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
WareThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 3, 3:02 AM CDT | Heat Advisory | OUN | Hughes, Lincoln, Logan, Payne, Pottawatomie, Seminole | 16 hr |
| Sep 3, 2:45 PM CDT | Special Weather Statement | OUN | Woods | 30 min |
| Sep 3, 3:00 PM CDT | Special Weather Statement | OUN | Harper | 30 min |
| Sep 3, 3:14 PM CDT | Special Weather Statement | OUN | Woods | 31 min |
| Sep 3, 3:45 PM CDT | Special Weather Statement | OUN | Ellis, Harper | 30 min |
| Sep 3, 3:49 PM CDT | Special Weather Statement | OUN | Alfalfa | 26 min |
| Sep 3, 4:14 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 46 min |
| Sep 3, 4:17 PM CDT | Special Weather Statement | OUN | Ellis, Woodward | 28 min |
| Sep 3, 4:48 PM CDT | Special Weather Statement | OUN | Woodward | 42 min |
| Sep 3, 5:30 PM CDT | Special Weather Statement | OUN | Woods | 30 min |
| Sep 3, 6:04 PM CDT | Special Weather Statement | OUN | Garfield | 26 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2021Every severe thunderstorm warning in 2021
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.