Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 252, NWS Norman, OK

May 29, 2018Harper County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 29, 2018, 4:20 PM CDT for Harper County, Oklahoma. It was in force for 40 min. 3 reports 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: May 29, 2018, 4:20 PM CDT (21:20 UTC)
Expired: May 29, 2018, 5:00 PM CDT
In force: 40 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Harper County, OK

The radar

The Dodge City radar (KDDC), 94 km from the middle of the area, began a volume at 21:19 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

Time	Report	Where	Remark
May 29, 4:39 PM CDT	HAIL 1.25	11 N Buffalo, OK
May 29, 4:45 PM CDT	HAIL 1.75	11 N Buffalo, OK
May 29, 5:10 PM CDT	HAIL 1.5	11 Nne Buffalo, OK	REPORTED VIA SPOTTER NETWORK.

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.

Issued	Product	Office	Lasted
May 29, 2:19 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Dodge City, (KDDC), launched 12:00Z, 9.3 hours before the alert went out and 93 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: 57 J/kg
Mixed-layer CIN: -422 J/kg
Mixed-layer LCL: 1490 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 487 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.3

Open this sounding in Storm Lab

The text

As transmitted.

588 
WUUS54 KOUN 292120
SVROUN
OKC059-292200-
/O.NEW.KOUN.SV.W.0252.180529T2120Z-180529T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
420 PM CDT TUE MAY 29 2018

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  North central Harper County in northwestern Oklahoma...

* Until 500 PM CDT

* At 420 PM CDT, a severe thunderstorm was located 10 miles north of
  Buffalo, moving northeast at 20 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. 

* This severe thunderstorm will remain over mainly rural areas of
  north central Harper County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

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

&&

LAT...LON 3700 9946 3699 9944 3697 9943 3688 9950
      3698 9986 3700 9984
TIME...MOT...LOC 2120Z 212DEG 17KT 3699 9964 

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

30

2 follow-up statements

018 
WUUS54 KOUN 292127 CCA
SVROUN
OKC059-292200-
/O.COR.KOUN.SV.W.0252.180529T2120Z-180529T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
427 PM CDT TUE MAY 29 2018

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  North central Harper County in northwestern Oklahoma...

* Until 500 PM CDT

* At 427 PM CDT, a severe thunderstorm was located 9 miles north of
  Buffalo, moving northeast at 15 mph.

  HAZARD...Golf ball size hail and 70 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings. 

* This severe thunderstorm will remain over mainly rural areas of
  north central Harper County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

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

&&

LAT...LON 3700 9946 3699 9944 3697 9943 3688 9950
      3698 9986 3700 9984
TIME...MOT...LOC 2127Z 230DEG 12KT 3699 9964 

HAIL...1.75IN
WIND...70MPH
 
$$

30

023 
WWUS54 KOUN 292134
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
434 PM CDT TUE MAY 29 2018

OKC059-292200-
/O.CON.KOUN.SV.W.0252.000000T0000Z-180529T2200Z/
Harper OK-
434 PM CDT TUE MAY 29 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR NORTH CENTRAL HARPER COUNTY...

At 434 PM CDT, a severe thunderstorm was located 11 miles northeast
of Buffalo, moving east at 15 mph.

HAZARD...Golf ball size hail and 70 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings. 

This severe thunderstorm will remain over mainly rural areas of north
central Harper County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms.

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

&&

LAT...LON 3700 9946 3699 9944 3697 9943 3688 9950
      3695 9973 3700 9972
TIME...MOT...LOC 2134Z 253DEG 14KT 3698 9953 

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...70MPH
 
$$

30

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 10:37 PM CDT	Special Weather Statement	OUN	Harper	23 min
May 28, 11:00 PM CDT	Special Weather Statement	OUN	Harper	45 min
May 28, 11:36 PM CDT	Special Weather Statement	OUN	Harper	39 min
May 29, 12:09 AM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woodward	51 min
May 29, 12:56 AM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woodward	49 min
May 29, 1:19 AM CDT	Severe Thunderstorm Warning	OUN	Ellis, Woodward	56 min
May 29, 1:44 AM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Woodward	46 min
May 29, 2:22 AM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major, Woodward	38 min
May 29, 3:05 AM CDT	Special Weather Statement	OUN	Blaine	40 min
May 29, 3:13 PM CDT	Special Weather Statement	OUN	Harper	32 min
May 29, 3:50 PM CDT	Special Weather Statement	OUN	Harper	25 min
May 29, 4:53 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	52 min
May 29, 5:42 PM CDT	Severe Thunderstorm Warning	OUN	Woods	48 min
May 29, 6:04 PM CDT	Severe Thunderstorm Warning	OUN	Harper	41 min
May 29, 6:09 PM CDT	Severe Thunderstorm Warning	OUN	Woods, Woodward	51 min
May 29, 6:45 PM CDT	Severe Thunderstorm Warning	OUN	Harper	45 min
May 29, 6:53 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	37 min
May 29, 6:56 PM CDT	Areal Flood Warning	OUN	Woods, Woodward	3 hr
May 29, 6:57 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woods, Woodward	48 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2018 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.