Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 133, NWS Norman, OK

April 17, 2015Comanche County, Kiowa County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 17, 2015, 6:09 AM CDT for Comanche County, Kiowa County, Oklahoma. It was in force for 51 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: Apr 17, 2015, 6:09 AM CDT (11:09 UTC)
Expired: Apr 17, 2015, 7:00 AM CDT
In force: 51 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Comanche County, OK, Kiowa County, OK

The radar

The Altus AFB radar (KFDR), 53 km from the middle of the area, began a volume at 10:55 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 11.2 hours before the alert went out and 275 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: 301 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 1659 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 142 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

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 Apr 17, 5:58 AM CDT, 11 minutes earlier.

Area forecast discussion, Apr 17, 5:58 AM CDT, 11 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
558 AM CDT FRI APR 17 2015

.DISCUSSION...
LINES OF STRONG THUNDERSTORMS WITH HEAVY RAIN ARE EXPECTED TO
WEAKEN OVER THE NEXT FEW HOURS. NOT SURE IF STORMS WILL MAKE IT TO
THE I-44 CORRIDOR. SEVERE POTENTIAL THIS MORNING REMAINS LOW.

AVIATION DISCUSSION FOR THE 12Z TAFS IS BELOW.

&&

.AVIATION...
HAVE LOW CONFIDENCE IN THE TAFS.

TSRA WILL WEAKEN THROUGH 15Z AND AFFECT MOST TAF SITES. IF TSRA
DIRECTLY AFFECTS A GIVEN SITE...BRIEF VARIABLE GUSTY WIND AND MVFR
OR LOWER CONDITIONS WILL OCCUR.

WIDESPREAD IFR CONDITIONS MAY DEVELOP 12-15Z WITH IMPROVING
CONDITIONS AFTER 15Z. THINK MOST...IF NOT ALL...LOCATIONS WILL BE
VFR BY 21Z.

ADDITIONAL ISO-NUM TSRA WILL OCCUR AFTER 15Z...ESPECIALLY AFTER
21Z ACROSS THE AREA. PINPOINTING EXACTLY WHERE AND WHEN REMAINS
VERY CHALLENGING.

ADDITIONAL IFR CONDITIONS MAY FORM AFTER 03Z ACROSS THE AREA.

MBS

&&

.PREV DISCUSSION... /ISSUED 200 AM CDT FRI APR 17 2015/

DISCUSSION...
SEVERE THUNDERSTORM AND HEAVY RAINFALL POTENTIAL THROUGH
SATURDAY NIGHT ARE THE MAIN CONCERNS.

DID NOT MAKE ANY SIGNIFICANT CHANGES TO THE PREVIOUS FORECAST.

LATEST RADARS INDICATED A LINE OF STRONG TO SEVERE STORMS MOVING
INTO FAR WESTERN OKLAHOMA AS WELL AS A WEAKENING LINE OF
THUNDERSTORMS OVER NORTHERN OKLAHOMA. THINK A FEW STORMS WILL BE
SEVERE EARLY THIS MORNING IN FAR WESTERN OKLAHOMA WITH SOME LARGE
HAIL AND WIND REPORTS AS THE ATMOSPHERE IS MORE SUPPORTIVE OF
SOME SEVERE WEATHER THERE AS OPPOSED TO NORTHERN OKLAHOMA DUE TO
HIGHER SHEAR AND INSTABILITY VALUES. BELIEVE THIS LINE WILL MOVE
EAST AND DISSIPATE TOWARDS SUNRISE AS IT MOVES INTO A MORE STABLE
AIRMASS AND AS THE LOW LEVEL JET WEAKENS. NOT SURE IF RAIN WILL
MAKE IT TO THE I-44 CORRIDOR LATER THIS MORNING.

HEAVY RAINFALL EARLY THIS MORNING WILL OCCUR IN PARTS OF WESTERN
OKLAHOMA WHERE SOME AREAS MAY GET AN ADDITIONAL 1 TO 3 INCHES OF
RAINFALL. WILL NOT ISSUE A FLASH FLOOD WATCH AT THIS TIME IN THESE
AREAS THINKING THE GROUND WILL BE ABLE TO HANDLE THE RAINFALL.

LATER TODAY...ADDITIONAL SHOWERS AND STORMS WILL OCCUR...MAINLY
LATE THIS AFTERNOON AND EVENING. EXACTLY WHERE AND WHEN
REDEVELOPMENT REMAINS TRICKY WITH NUMEROUS MESOSCALE BOUNDARIES
AROUND. MOST MODELS FAVOR WESTERN OKLAHOMA AGAIN FOR HIGHER
CHANCES OF STORM DEVELOPMENT. BELIEVE THERE WILL BE MORE DRY HOURS
THAN WET ONES ACROSS THE REGION TODAY.

LIKE YESTERDAY...SOME SEVERE STORMS WILL LIKELY OCCUR LATE THIS
AFTERNOON AND EVENING WITH LARGE HAIL UP TO TENNIS BALL SIZE AS
THE MAIN HAZARD...THOUGH DAMAGING WINDS TO 70 MPH WOULD BE
POSSIBLE TODAY. A FEW TORNADOES COULD OCCUR SIMILAR TO
YESTERDAY...THOUGH LOW LEVEL SHEAR MAY BE A BIT WEAKER.

TONIGHT THROUGH SATURDAY NIGHT...STORM CHANCES WILL CONTINUE AND
WILL LIKELY SHEAR EASTWARD. HEAVY RAINFALL MAY RESULT ACROSS
PARTS OF THE AREA. SMALL SCALE FEATURES WILL DICTATE SEVERE
STORM/HEAVY RAIN POTENTIAL AS WELL AS RAIN CHANCES DURING THIS
TIME FRAME. SIMILAR TO TODAY...THINK MANY LOCATIONS WILL BE DRY
FOR MUCH OF THE DAY ON SATURDAY.

SUNDAY AND SUNDAY NIGHT...RAIN CHANCES MAY LINGER ACROSS THE AREA
WITH THE PASSAGE OF THE MID/UPPER LOW...ESPECIALLY IN NORTHERN
OKLAHOMA...THOUGH SEVERE STORM AND HEAVY RAINFALL POTENTIAL
SHOULD DECREASE AS MORE STABLE AIR MOVES INTO THE AREA.

MONDAY THROUGH THURSDAY...ADDITIONAL RAIN CHANCES MAY RETURN
DURING THIS TIME FRAME...BUT CONFIDENCE REMAINS LOW. TEMPERATURES
ARE GENERALLY FORECAST TO BE NEAR AVERAGE FOR THIS TIME OF YEAR.

MBS

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  74  59  78  55 /  50  60  30  30
HOBART OK         75  55  80  51 /  60  50  20  20
WICHITA FALLS TX  77  58  81  54 /  50  50  20  20
GAGE OK           74  51  79  48 /  50  50  20  30
PONCA CITY OK     74  58  76  54 /  50  70  50  50
DURANT OK         77  62  79  59 /  40  60  30  30

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
TX...NONE.
&&

25/17/17

Hazardous weather outlook, Apr 17, 4:29 AM CDT, 1 hour 40 minutes before

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In the hours before

Special weather statement, Apr 17, 3:55 AM CDT, 2 hours 14 minutes before

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Special weather statement, Apr 17, 4:43 AM CDT, 1 hour 26 minutes before

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Special weather statement, Apr 17, 5:03 AM CDT, 1 hour 6 minutes before

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Special weather statement, Apr 17, 5:17 AM CDT, 52 minutes before

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Special weather statement, Apr 17, 5:34 AM CDT, 35 minutes before

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Special weather statement, Apr 17, 5:58 AM CDT, 11 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 16, 7:07 PM CDT	Special Weather Statement	OUN	Alfalfa	23 min
Apr 16, 7:25 PM CDT	Special Weather Statement	OUN	Beckham	20 min
Apr 16, 7:32 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer	43 min
Apr 16, 7:33 PM CDT	Special Weather Statement	OUN	Woods	27 min
Apr 16, 7:37 PM CDT	Special Weather Statement	OUN	Harper	23 min
Apr 16, 7:40 PM CDT	Special Weather Statement	OUN	Alfalfa	35 min
Apr 16, 7:42 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Ellis, Roger Mills, Woodward	63 min
Apr 16, 7:47 PM CDT	Special Weather Statement	OUN	Woodward	28 min
Apr 16, 8:01 PM CDT	Tornado Warning	OUN	Beckham	29 min
Apr 16, 8:03 PM CDT	Flash Flood Warning	OUN	Woods, Woodward	3 hr
Apr 16, 8:05 PM CDT	Areal Flood Advisory	OUN	Ellis, Roger Mills, Woodward	3 hr
Apr 16, 8:35 PM CDT	Tornado Warning	OUN	Roger Mills	40 min
Apr 16, 8:36 PM CDT	Special Weather Statement	OUN	Alfalfa	24 min
Apr 16, 8:54 PM CDT	Special Weather Statement	OUN	Woods	36 min
Apr 16, 8:58 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	47 min
Apr 16, 9:08 PM CDT	Special Weather Statement	OUN	Alfalfa	37 min
Apr 16, 9:11 PM CDT	Tornado Warning	OUN	Beckham, Roger Mills	49 min
Apr 16, 9:20 PM CDT	Areal Flood Advisory	OUN	Roger Mills	3 hr
Apr 16, 9:31 PM CDT	Special Weather Statement	OUN	Woods	29 min
Apr 16, 9:36 PM CDT	Special Weather Statement	OUN	Woods	24 min
Apr 16, 9:54 PM CDT	Special Weather Statement	OUN	Grant	36 min
Apr 16, 9:57 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Dewey, Ellis, Roger Mills	48 min
Apr 16, 10:01 PM CDT	Special Weather Statement	OUN	Alfalfa	29 min
Apr 16, 10:27 PM CDT	Special Weather Statement	OUN	Alfalfa	33 min
Apr 16, 10:44 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	25 min
Apr 16, 10:52 PM CDT	Special Weather Statement	OUN	Alfalfa	38 min
Apr 16, 11:09 PM CDT	Special Weather Statement	OUN	Grant	36 min
Apr 16, 11:40 PM CDT	Special Weather Statement	OUN	Garfield	35 min
Apr 16, 11:45 PM CDT	Special Weather Statement	OUN	Major	30 min
Apr 16, 11:47 PM CDT	Special Weather Statement	OUN	Grant	28 min
Apr 17, 12:39 AM CDT	Areal Flood Advisory	OUN	Garfield	3 hr
Apr 17, 12:42 AM CDT	Special Weather Statement	OUN	Dewey	33 min
Apr 17, 1:00 AM CDT	Special Weather Statement	OUN	Ellis	30 min
Apr 17, 1:17 AM CDT	Special Weather Statement	OUN	Roger Mills	28 min
Apr 17, 1:25 AM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	50 min
Apr 17, 1:54 AM CDT	Special Weather Statement	OUN	Major	36 min
Apr 17, 2:22 AM CDT	Special Weather Statement	OUN	Dewey	23 min
Apr 17, 2:32 AM CDT	Special Weather Statement	OUN	Garfield	28 min
Apr 17, 2:53 AM CDT	Special Weather Statement	OUN	Dewey, Major	37 min
Apr 17, 3:02 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon, Jackson	43 min
Apr 17, 3:33 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Greer, Harmon, Kiowa, Roger Mills and 1 more	42 min
Apr 17, 3:55 AM CDT	Special Weather Statement	OUN	Jackson	35 min
Apr 17, 4:13 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Dewey, Greer, Kiowa, Roger Mills and 1 more	47 min
Apr 17, 4:20 AM CDT	Areal Flood Advisory	OUN	Beckham, Custer, Dewey, Roger Mills, Washita	3 hr
Apr 17, 4:43 AM CDT	Special Weather Statement	OUN	Jackson	32 min
Apr 17, 5:03 AM CDT	Special Weather Statement	OUN	Washita	27 min
Apr 17, 5:17 AM CDT	Special Weather Statement	OUN	Jackson	28 min
Apr 17, 5:32 AM CDT	River Flood Warning	OUN	Custer, Roger Mills	20 hr
Apr 17, 5:34 AM CDT	Special Weather Statement	OUN	Caddo	26 min
Apr 17, 5:58 AM CDT	Special Weather Statement	OUN	Tillman	32 min
Apr 17, 6:59 AM CDT	Special Weather Statement	OUN	Comanche	31 min
Apr 17, 7:14 AM CDT	Special Weather Statement	OUN	Comanche	46 min
Apr 17, 8:36 AM CDT	Special Weather Statement	OUN	Grady	24 min
Apr 17, 8:37 AM CDT	Special Weather Statement	OUN	Harmon, Jackson, Kiowa, Tillman	38 min
Apr 17, 9:40 AM CDT	Special Weather Statement	OUN	Tillman	50 min
Apr 17, 9:53 AM CDT	Special Weather Statement	OUN	Harmon	37 min
Apr 17, 9:56 AM CDT	Severe Thunderstorm Warning	OUN	Jackson	36 min
Apr 17, 10:08 AM CDT	Special Weather Statement	OUN	Kiowa	37 min
Apr 17, 10:43 AM CDT	Special Weather Statement	OUN	Caddo	32 min
Apr 17, 10:47 AM CDT	Special Weather Statement	OUN	Greer, Jackson	28 min
Apr 17, 11:01 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	26 min
Apr 17, 4:50 PM CDT	Special Weather Statement	OUN	Woodward	25 min
Apr 17, 5:55 PM CDT	Special Weather Statement	OUN	Harper	35 min
Apr 17, 6:05 PM CDT	Special Weather Statement	OUN	Blaine	25 min
Apr 17, 9:05 AM CDT	Special Weather Statement	OUN	Foard	25 min
Apr 17, 9:18 AM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	42 min
Apr 17, 11:24 AM CDT	Severe Thunderstorm Warning	OUN	Knox	40 min
Apr 17, 11:38 AM CDT	Special Weather Statement	OUN	Foard	52 min
Apr 17, 12:06 PM CDT	Special Weather Statement	OUN	Baylor, Foard, Hardeman, Knox, Wilbarger	24 min
Apr 17, 1:51 PM CDT	Special Weather Statement	OUN	Archer	24 min
Apr 17, 3:00 PM CDT	Special Weather Statement	OUN	Knox	30 min
Apr 17, 3:05 PM CDT	Special Weather Statement	OUN	Knox	25 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2015 Every severe thunderstorm warning in 2015

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.