Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 708, NWS Norman, OK

August 31, 2020Pottawatomie County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 31, 2020, 10:15 PM CDT for Pottawatomie County, Oklahoma. It was in force for 30 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: Aug 31, 2020, 10:15 PM CDT (03:15 UTC)
Expired: Aug 31, 2020, 10:45 PM CDT
In force: 30 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Pottawatomie County, OK

The radar

The Norman radar (KTLX), 40 km from the middle of the area, began a volume at 03:18 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
Aug 31, 3:53 PM CDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 3.3 hours before the alert went out and 251 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1092 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 2152 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.1

Open this sounding in Storm Lab

The text

As transmitted.

188 
WUUS54 KOUN 010315
SVROUN
OKC125-010345-
/O.NEW.KOUN.SV.W.0708.200901T0315Z-200901T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
1015 PM CDT Mon Aug 31 2020

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Southwestern Pottawatomie County in central Oklahoma...

* Until 1045 PM CDT.

* At 1015 PM CDT, a severe thunderstorm was located near Tribbey,
  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...
  Maud, Tribbey, St. Louis, Macomb and Trousdale. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3502 9711 3514 9711 3520 9679 3499 9678
TIME...MOT...LOC 0315Z 268DEG 13KT 3509 9705 

HAIL...1.00IN
WIND...60MPH
 
$$

BRB

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 31, 7:00 PM CDT	Special Weather Statement	OUN	McClain	15 min
Aug 31, 7:01 PM CDT	Special Weather Statement	OUN	Canadian	29 min
Aug 31, 7:02 PM CDT	Special Weather Statement	OUN	Noble	28 min
Aug 31, 7:20 PM CDT	Special Weather Statement	OUN	Cleveland	25 min
Aug 31, 7:30 PM CDT	Severe Thunderstorm Warning	OUN	Grady, McClain	30 min
Aug 31, 7:31 PM CDT	Severe Thunderstorm Warning	OUN	McClain	29 min
Aug 31, 7:34 PM CDT	Special Weather Statement	OUN	Noble	26 min
Aug 31, 7:41 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	49 min
Aug 31, 7:54 PM CDT	Special Weather Statement	OUN	Kay	21 min
Aug 31, 8:00 PM CDT	Severe Thunderstorm Warning	OUN	Grady, McClain	30 min
Aug 31, 8:04 PM CDT	Special Weather Statement	OUN	Cleveland	26 min
Aug 31, 8:14 PM CDT	Special Weather Statement	OUN	Kay	31 min
Aug 31, 8:17 PM CDT	Special Weather Statement	OUN	Grady	28 min
Aug 31, 8:21 PM CDT	Areal Flood Advisory	OUN	Canadian	3 hr
Aug 31, 8:23 PM CDT	Special Weather Statement	OUN	Garfield	22 min
Aug 31, 8:28 PM CDT	Special Weather Statement	OUN	McClain	32 min
Aug 31, 8:47 PM CDT	Special Weather Statement	OUN	Oklahoma	43 min
Aug 31, 8:57 PM CDT	Special Weather Statement	OUN	Cleveland	18 min
Aug 31, 9:05 PM CDT	Areal Flood Advisory	OUN	Canadian, Oklahoma	3 hr
Aug 31, 9:15 PM CDT	Special Weather Statement	OUN	Pottawatomie	15 min
Aug 31, 9:16 PM CDT	Special Weather Statement	OUN	Tillman	44 min
Aug 31, 9:24 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Pottawatomie	51 min
Aug 31, 9:38 PM CDT	Special Weather Statement	OUN	Canadian	37 min
Aug 31, 9:40 PM CDT	Severe Thunderstorm Warning	OUN	Canadian	35 min
Aug 31, 9:58 PM CDT	Special Weather Statement	OUN	Canadian	17 min
Aug 31, 10:13 PM CDT	Severe Thunderstorm Warning	OUN	Canadian	32 min
Aug 31, 10:33 PM CDT	Special Weather Statement	OUN	Canadian	27 min
Aug 31, 10:36 PM CDT	Special Weather Statement	OUN	Oklahoma	24 min
Aug 31, 10:42 PM CDT	Flash Flood Warning	OUN	Canadian, Oklahoma	4 hr
Aug 31, 10:45 PM CDT	Special Weather Statement	OUN	Pottawatomie, Seminole	30 min
Aug 31, 10:48 PM CDT	Areal Flood Advisory	OUN	Caddo, Canadian	3 hr
Aug 31, 10:55 PM CDT	Special Weather Statement	OUN	Blaine	35 min
Aug 31, 10:56 PM CDT	Special Weather Statement	OUN	Canadian	34 min
Aug 31, 11:00 PM CDT	Special Weather Statement	OUN	Oklahoma	30 min
Aug 31, 11:09 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	30 min
Aug 31, 11:26 PM CDT	Flash Flood Warning	OUN	Canadian	3 hr
Aug 31, 11:35 PM CDT	Special Weather Statement	OUN	Canadian	25 min
Sep 1, 12:06 AM CDT	Areal Flood Advisory	OUN	Cleveland, Oklahoma	3 hr
Sep 1, 12:14 AM CDT	Severe Thunderstorm Warning	OUN	Pontotoc, Seminole	31 min
Sep 1, 12:15 AM CDT	Severe Thunderstorm Warning	OUN	Hughes	30 min
Sep 1, 12:17 AM CDT	Tornado Warning	OUN	Hughes	28 min
Sep 1, 12:32 AM CDT	Special Weather Statement	OUN	Pontotoc	28 min
Sep 1, 12:38 AM CDT	Tornado Warning	OUN	Hughes, Pontotoc, Seminole	37 min
Sep 1, 12:41 AM CDT	Special Weather Statement	OUN	Cleveland	34 min
Sep 1, 12:44 AM CDT	Tornado Warning	OUN	Hughes	31 min
Sep 1, 12:57 AM CDT	Areal Flood Advisory	OUN	Hughes, Pontotoc, Seminole	3 hr
Sep 1, 1:29 AM CDT	Flash Flood Warning	OUN	Hughes	3 hr
Sep 1, 2:21 AM CDT	Areal Flood Warning	OUN	Canadian	9 min
Sep 1, 2:44 AM CDT	Areal Flood Warning	OUN	Canadian, Oklahoma	3 hr
Sep 1, 2:49 AM CDT	Areal Flood Warning	OUN	Canadian	3 hr
Sep 1, 4:11 AM CDT	River Flood Advisory	OUN	Pottawatomie, Seminole	3 hr
Sep 1, 4:17 AM CDT	Areal Flood Warning	OUN	Hughes	3 hr
Sep 1, 5:17 AM CDT	River Flood Advisory	OUN	Canadian, Oklahoma	15 hr
Sep 1, 5:55 AM CDT	Flash Flood Warning	OUN	Hughes, Pontotoc, Pottawatomie, Seminole	3 hr
Sep 1, 6:00 AM CDT	Flash Flood Warning	OUN	Garvin, Grady, McClain	3 hr
Sep 1, 6:48 AM CDT	Areal Flood Advisory	OUN	Atoka, Coal, Garvin, Johnston, Murray, Pontotoc	3 hr
Sep 1, 7:42 AM CDT	Areal Flood Advisory	OUN	Carter, Garvin, Murray	3 hr
Sep 1, 8:07 AM CDT	Flash Flood Warning	OUN	Atoka	3 hr
Sep 1, 8:11 AM CDT	Areal Flood Advisory	OUN	Atoka, Bryan, Johnston, Love, Marshall	3 hr
Sep 1, 8:17 AM CDT	Areal Flood Advisory	OUN	Cleveland, Pottawatomie	3 hr
Sep 1, 8:34 AM CDT	Flash Flood Warning	OUN	Carter, Murray	3 hr
Sep 1, 9:03 AM CDT	Flash Flood Warning	OUN	Love	3 hr
Sep 1, 9:50 AM CDT	Areal Flood Advisory	OUN	Atoka, Coal, Hughes, Johnston, Murray, Pontotoc	3 hr
Sep 1, 11:18 AM CDT	River Flood Warning	OUN	Pottawatomie, Seminole	15 hr
Sep 1, 11:20 AM CDT	River Flood Advisory	OUN	Lincoln, Oklahoma, Pottawatomie	22 hr
Sep 1, 2:59 PM CDT	Special Weather Statement	OUN	Harper	31 min
Sep 1, 4:03 PM CDT	Areal Flood Advisory	OUN	Carter, Garvin, Jefferson, Stephens	3 hr
Sep 1, 4:18 PM CDT	Special Weather Statement	OUN	Harper	27 min
Sep 1, 4:35 PM CDT	Areal Flood Advisory	OUN	Carter, Jefferson, Murray	3 hr
Sep 1, 4:56 PM CDT	Special Weather Statement	OUN	Harper	34 min
Sep 1, 5:14 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woodward	46 min
Sep 1, 5:59 PM CDT	Special Weather Statement	OUN	Woodward	31 min
Sep 1, 6:06 PM CDT	Areal Flood Advisory	OUN	Johnston, Murray, Pontotoc	3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2020 Every 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.