Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 521, NWS Norman, OK

July 11, 2020Ellis County, Harper County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 11, 2020, 8:06 PM CDT for Ellis County, Harper County, Oklahoma. It was in force for 39 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jul 11, 2020, 8:06 PM CDT (01:06 UTC)
Expired
Jul 11, 2020, 8:45 PM CDT
In force
39 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Hail
1.5 in
Wind
60.0 mph

Counties Ellis County, OK, Harper County, OK

The radar

The Dodge City radar (KDDC), 124 km from the middle of the area, began a volume at 01:06 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.

What was reported inside it

TimeReportWhereRemark
Jul 11, 8:48 PM CDTHAIL 1Laverne, OK

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 11, 6:08 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Dodge City, (KDDC), launched 00:00Z, 1.1 hours before the alert went out and 124 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-pSkew-T log-p diagram, Dodge City, at 00:00Z on 2020-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3027 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Dodge City, at 00:00Z on 2020-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
3027 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
1789 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
246 m²/s²
Significant tornado parameter
0.7
Supercell composite
17.4

Open this sounding in Storm Lab

The text

As transmitted.

287 
WUUS54 KOUN 120106
SVROUN
OKC045-059-120145-
/O.NEW.KOUN.SV.W.0521.200712T0106Z-200712T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
806 PM CDT Sat Jul 11 2020

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 845 PM CDT.

* At 806 PM CDT, a severe thunderstorm was located near Slapout,
  moving east at 20 mph.

  HAZARD...Ping pong ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* Locations impacted include...
  Laverne, Buffalo, May and Catesby. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3679 10000 3690 9958 3659 9960 3640 9969
      3646 10000
TIME...MOT...LOC 0106Z 264DEG 19KT 3664 10009 

HAIL...1.50IN
WIND...60MPH
 
$$

BRB

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 7:09 PM CDTSevere Thunderstorm WarningOUNGarfield, Logan, Noble36 min
Jul 11, 7:22 PM CDTSevere Thunderstorm WarningOUNEllis, Harper, Woodward38 min
Jul 11, 7:24 PM CDTSpecial Weather StatementOUNMajor21 min
Jul 11, 7:27 PM CDTSevere Thunderstorm WarningOUNBlaine, Major, Woods48 min
Jul 11, 7:29 PM CDTSevere Thunderstorm WarningOUNGarfield, Kingfisher, Logan, Major31 min
Jul 11, 7:29 PM CDTSevere Thunderstorm WarningOUNMajor, Woods, Woodward46 min
Jul 11, 7:43 PM CDTSevere Thunderstorm WarningOUNGarfield, Logan, Noble, Payne32 min
Jul 11, 7:59 PM CDTSevere Thunderstorm WarningOUNEllis, Harper, Woodward31 min
Jul 11, 8:08 PM CDTSevere Thunderstorm WarningOUNGarfield, Noble, Payne52 min
Jul 11, 8:11 PM CDTSevere Thunderstorm WarningOUNMajor, Woods, Woodward49 min
Jul 11, 8:13 PM CDTSevere Thunderstorm WarningOUNBlaine, Garfield, Kingfisher, Major20 min
Jul 11, 8:24 PM CDTSevere Thunderstorm WarningOUNGarfield, Grant, Kay, Noble51 min
Jul 11, 8:29 PM CDTSevere Thunderstorm WarningOUNHarper, Woods, Woodward46 min
Jul 11, 8:36 PM CDTSevere Thunderstorm WarningOUNGarfield, Grant, Kay, Noble24 min
Jul 11, 8:41 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Major, Woods49 min
Jul 11, 8:44 PM CDTSevere Thunderstorm WarningOUNHarper46 min
Jul 11, 8:49 PM CDTSevere Thunderstorm WarningOUNGrant26 min
Jul 11, 8:51 PM CDTSevere Thunderstorm WarningOUNKay, Noble24 min
Jul 11, 8:57 PM CDTSevere Thunderstorm WarningOUNWoods48 min
Jul 11, 9:00 PM CDTSevere Thunderstorm WarningOUNGarfield, Grant, Kay, Noble45 min
Jul 11, 9:05 PM CDTAreal Flood AdvisoryOUNWoods, Woodward3 hr
Jul 11, 9:10 PM CDTSevere Thunderstorm WarningOUNNoble50 min
Jul 11, 9:13 PM CDTSevere Thunderstorm WarningOUNGarfield, Grant32 min
Jul 11, 9:15 PM CDTSevere Thunderstorm WarningOUNGarfield, Grant30 min
Jul 11, 9:25 PM CDTSevere Thunderstorm WarningOUNGarfield, Noble50 min
Jul 11, 9:29 PM CDTSevere Thunderstorm WarningOUNHarper, Woods46 min
Jul 11, 9:38 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Woods67 min
Jul 11, 9:43 PM CDTSevere Thunderstorm WarningOUNGarfield, Grant48 min
Jul 11, 9:51 PM CDTSevere Thunderstorm WarningOUNKay53 min
Jul 11, 10:01 PM CDTSevere Thunderstorm WarningOUNNoble59 min
Jul 11, 10:05 PM CDTSevere Thunderstorm WarningOUNWoods40 min
Jul 11, 10:10 PM CDTSevere Thunderstorm WarningOUNPayne65 min
Jul 11, 10:16 PM CDTSpecial Weather StatementOUNMajor29 min
Jul 11, 10:20 PM CDTSevere Thunderstorm WarningOUNBlaine40 min
Jul 11, 10:48 PM CDTSpecial Weather StatementOUNAlfalfa27 min
Jul 11, 11:00 PM CDTSpecial Weather StatementOUNCanadian30 min
Jul 11, 11:02 PM CDTSpecial Weather StatementOUNLincoln28 min
Jul 11, 11:11 PM CDTSpecial Weather StatementOUNAlfalfa34 min
Jul 11, 11:14 PM CDTSevere Thunderstorm WarningOUNCanadian, Grady, Kingfisher31 min
Jul 11, 11:33 PM CDTSevere Thunderstorm WarningOUNCanadian, Cleveland, Grady, McClain, Oklahoma57 min
Jul 11, 11:36 PM CDTSpecial Weather StatementOUNLincoln, Pottawatomie, Seminole39 min
Jul 11, 11:45 PM CDTSpecial Weather StatementOUNAtoka45 min
Jul 11, 11:50 PM CDTSevere Thunderstorm WarningOUNCaddo, Grady, McClain25 min
Jul 12, 12:06 AM CDTSevere Thunderstorm WarningOUNCleveland, Garvin, Grady, McClain, Murray, Oklahoma and 3 more39 min
Jul 12, 12:37 AM CDTSevere Thunderstorm WarningOUNCaddo, Carter, Comanche, Cotton, Garvin, Grady and 2 more38 min
Jul 12, 12:41 AM CDTSevere Thunderstorm WarningOUNCarter, Cleveland, Coal, Garvin, Hughes, Johnston and 5 more49 min
Jul 12, 1:15 AM CDTSevere Thunderstorm WarningOUNBlaine, Major, Woods45 min
Jul 12, 1:18 AM CDTSpecial Weather StatementOUNCotton, Jackson, Stephens, Tillman27 min
Jul 12, 1:20 AM CDTSevere Thunderstorm WarningOUNAtoka, Bryan, Carter, Coal, Hughes, Johnston and 4 more55 min
Jul 12, 1:30 AM CDTSpecial Weather StatementOUNKingfisher, Oklahoma45 min
Jul 12, 1:37 AM CDTSevere Thunderstorm WarningOUNCanadian, Kingfisher, Logan, Oklahoma38 min
Jul 12, 1:44 AM CDTSevere Thunderstorm WarningOUNCarter, Jefferson, Love61 min
Jul 12, 1:54 AM CDTSevere Thunderstorm WarningOUNBlaine, Kingfisher, Major, Woods66 min
Jul 12, 1:59 AM CDTSpecial Weather StatementOUNComanche31 min
Jul 12, 2:11 AM CDTSevere Thunderstorm WarningOUNAtoka, Bryan, Carter, Johnston, Love, Marshall49 min
Jul 12, 2:14 AM CDTSevere Thunderstorm WarningOUNOklahoma46 min
Jul 12, 2:18 AM CDTSevere Thunderstorm WarningOUNBlaine, Canadian, Kingfisher42 min
Jul 12, 2:22 AM CDTSevere Thunderstorm WarningOUNCaddo, Comanche53 min
Jul 12, 2:41 AM CDTSevere Thunderstorm WarningOUNCanadian, Cleveland, Grady, McClain, Oklahoma31 min
Jul 12, 2:55 AM CDTSevere Thunderstorm WarningOUNBlaine, Kingfisher18 min
Jul 12, 2:56 AM CDTSpecial Weather StatementOUNBryan49 min
Jul 12, 3:05 AM CDTSpecial Weather StatementOUNCleveland25 min
Jul 12, 3:16 AM CDTSpecial Weather StatementOUNGrady29 min
Jul 12, 3:21 AM CDTSpecial Weather StatementOUNGrady24 min
Jul 12, 3:52 AM CDTSpecial Weather StatementOUNJefferson, Stephens23 min
Jul 12, 4:06 AM CDTSpecial Weather StatementOUNCarter, Garvin, Jefferson, Murray39 min
Jul 12, 5:36 AM CDTSpecial Weather StatementOUNJackson, Tillman54 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.