Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 846, NWS Norman, OK

October 6, 2016Alfalfa County, Grant County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 6, 2016, 12:01 AM CDT for Alfalfa County, Grant County, Oklahoma. It was in force for 44 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: Oct 6, 2016, 12:01 AM CDT (05:01 UTC)
Expired: Oct 6, 2016, 12:45 AM CDT
In force: 44 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Alfalfa County, OK, Grant County, OK

The radar

The Vance AFB radar (KVNX), 7 km from the middle of the area, began a volume at 05:00 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

Norman, OK (KOUN), launched 00:00Z, 5.0 hours before the alert went out and 181 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: 2652 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1415 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 209 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 9.0

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 Oct 5, 9:41 PM CDT, 2 hours 20 minutes earlier.

Area forecast discussion, Oct 5, 9:41 PM CDT, 2 hours 20 minutes before

Area Forecast Discussion...UPDATED
National Weather Service Norman OK
941 PM CDT WED OCT 5 2016

.DISCUSSION...
Updated forecast will include increasing mins slightly east of
dryline and increasing pops across north-central Oklahoma. High
Rest models all continue to increase coverage of showers and
storms overnight near nose of low-level jet across Kansas and
northern Oklahoma. Post convective subsidence and continuing
convection across northern Texas may inhibit storm development
first part of the night across central and southwest Oklahoma so
pops were not significantly changed there. With deep layer shear
sufficient there could be a few severe storms overnight with large
hail the main impact.

&&

.PREV DISCUSSION... /issued 645 PM CDT WED OCT 5 2016/

AVIATION...
For 00Z TAFs, VFR conditions expected to be seen most terminals.
Isolated to scattered storms south and west of KLAW/KSPS will be
monitored for terminals impacts with amendments as needed. More
numerous showers and storms possible overnight and tomorrow with
most impacts toward and after end of forecast period as frontal
boundary approaches from Kansas.

PREV DISCUSSION... /issued 248 PM CDT WED OCT 5 2016/

DISCUSSION...

Several runs of the operational HRRR indicate a few storms may
develop by late afternoon across western north Texas and far
southern Oklahoma. This will mainly occur along and near a
dryline. Instability and shear will certainly support a few severe
storms with hail and wind.

During evening and overnight, surface winds will back and better
moisture will return to western Oklahoma. This may result in
additional showers and thunderstorms. Overnight, better chances
for showers and storms should shift into northern Oklahoma as
strong low level flow gradually decreases across southern Kansas.

A little uncertain about showers and thunderstorm chances Thursday
morning and early afternoon, but some cloud cover will linger
through the morning.

By late afternoon, a cold front will enter far northern Oklahoma as
a trough lifts from the central Rockies into the central
Plains.  Better height falls will remain north of the area, but a
deep enough frontal boundary will result in scattered to numerous
showers and storms along and just behind the front. Moderate
instability ahead of the front will allow for strong to severe
storms, with strong winds and hail.

The front will clear southern Oklahoma and western north Texas by
early morning Friday.  Therefore, some rain and showers may linger
near the Red River early but better chances for rain will be
across northern and central Texas.

Mainly dry conditions are expected over the weekend.  A trough will
skirt northwestern Oklahoma late in the weekend/early Monday.
Some elevated showers and storms may develop as a result.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  71  87  54  67 /  30  30  80  20
Hobart OK         69  86  54  68 /  30  40  80  20
Wichita Falls TX  72  89  59  70 /  30  10  70  50
Gage OK           60  87  45  70 /  10  30  40  10
Ponca City OK     70  88  51  67 /  50  50  90  20
Durant OK         71  88  65  75 /  10  10  40  30

&&

.OUN Watches/Warnings/Advisories...
OK...None.
TX...None.
&&

11/14

Hazardous weather outlook, Oct 5, 10:20 PM CDT, 1 hour 41 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATE
NATIONAL WEATHER SERVICE NORMAN OK
1020 PM CDT WED OCT 5 2016

OKZ004>048-050>052-TXZ083>090-061700-
HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD-
NOBLE-ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE-
BECKHAM-WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN-
CLEVELAND-POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON-
TILLMAN-COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON-
JEFFERSON-CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN-
FOARD-WILBARGER-WICHITA-KNOX-BAYLOR-ARCHER-CLAY-
1020 PM CDT WED OCT 5 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN...
WESTERN...CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH
TEXAS.

.DAY ONE...TONIGHT...

.THUNDERSTORMS...
SCATTERED STRONG STORMS WILL DEVELOP FROM WESTERN NORTH TEXAS
NORTHWARD INTO CENTRAL AND NORTHERN OKLAHOMA. A FEW OF THE STORMS
MAY BRIEFLY REACH SEVERE LEVELS AND PRODUCE HAIL SLIGHTLY LARGER
THAN QUARTERS. THERE IS A MARGINAL RISK FOR SEVERE STORMS ACROSS
ALL BUT EXTREME WESTERN OKLAHOMA AND FAR SOUTHEAST OKLAHOMA.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

.THUNDERSTORMS...
THUNDERSTORMS ARE EXPECTED TO DEVELOP AGAIN LATE THURSDAY AFTERNOON
NEAR AND AHEAD OF A COLD FRONT ACROSS NORTHERN AND WESTERN OKLAHOMA.
SEVERE STORMS WILL BE POSSIBLE WITH LARGE HAIL AND DAMAGING WIND
GUSTS THE MAIN CONCERNS. INITIALLY...EXCESSIVE RAINFALL WILL BE A
CONCERN BEFORE THE STORMS ORGANIZED INTO A SQUALL LINE LATE THURSDAY
NIGHT AND EARLY FRIDAY MORNING. THERE IS A SLIGHT RISK OF SEVERE
STORMS THURSDAY AFTERNOON AND EVENING ACROSS A LARGE PART OF NORTHERN
AND WESTERN OKLAHOMA.

THUNDERSTORMS WILL BE POSSIBLE ACROSS PARTS OF NORTHERN OKLAHOMA
SUNDAY AND AGAIN ON TUESDAY.

GET GRAPHICS AND MORE DETAILS AT WEATHER.GOV/NORMAN...AND FOLLOW
OUR WEATHER FORECAST OFFICE ON TWITTER AND FACEBOOK.

In the hours before

Special weather statement, Oct 5, 10:31 PM CDT, 1 hour 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1031 PM CDT WED OCT 5 2016

OKZ012-018-019-060400-
LOGAN OK-KINGFISHER OK-GARFIELD OK-
1031 PM CDT WED OCT 5 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN LOGAN...NORTHEASTERN
KINGFISHER AND SOUTH CENTRAL GARFIELD COUNTIES UNTIL 1100 PM CDT...

AT 1030 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 4 MILES EAST OF
HENNESSEY...MOVING NORTHEAST AT 40 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

LAT...LON 3593 9778 3606 9796 3630 9782 3629 9764
      3619 9755
TIME...MOT...LOC 0330Z 214DEG 35KT 3609 9782

MAD

Special weather statement, Oct 5, 11:03 PM CDT, 58 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1103 PM CDT WED OCT 5 2016

OKZ011-017-018-060430-
BLAINE OK-MAJOR OK-KINGFISHER OK-
1103 PM CDT WED OCT 5 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BLAINE...
SOUTHEASTERN MAJOR AND NORTHWESTERN KINGFISHER COUNTIES UNTIL 1130 PM
CDT...

AT 1102 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR HITCHCOCK...
MOVING NORTHEAST AT 35 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

LAT...LON 3583 9836 3592 9851 3623 9831 3620 9816
      3612 9804
TIME...MOT...LOC 0402Z 216DEG 28KT 3599 9835

MAD

Special weather statement, Oct 5, 11:14 PM CDT, 47 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1114 PM CDT WED OCT 5 2016

OKZ007-008-012-013-060445-
GRANT OK-NOBLE OK-KAY OK-GARFIELD OK-
1114 PM CDT WED OCT 5 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN GRANT...NORTHWESTERN
NOBLE...SOUTHWESTERN KAY AND NORTHEASTERN GARFIELD COUNTIES UNTIL
1145 PM CDT...

AT 1113 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR
GARBER...MOVING NORTHEAST AT 40 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

LAT...LON 3667 9725 3636 9752 3641 9774 3674 9759
      3676 9739
TIME...MOT...LOC 0413Z 206DEG 36KT 3647 9757

MAD

Special weather statement, Oct 5, 11:41 PM CDT, 20 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1141 PM CDT WED OCT 5 2016

OKZ012-013-060515-
NOBLE OK-GARFIELD OK-
1141 PM CDT WED OCT 5 2016

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL NOBLE AND
SOUTHEASTERN GARFIELD COUNTIES UNTIL 1215 AM CDT...

AT 1140 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 4 MILES SOUTHWEST
OF LUCIEN...MOVING NORTHEAST AT 20 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

LAT...LON 3638 9741 3629 9732 3616 9752 3621 9764
      3639 9755
TIME...MOT...LOC 0440Z 215DEG 19KT 3624 9754

MAD

Special weather statement, Oct 5, 11:53 PM CDT, 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1153 PM CDT WED OCT 5 2016

OKZ019-020-026-060530-
LOGAN OK-LINCOLN OK-PAYNE OK-
1153 PM CDT WED OCT 5 2016

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL LOGAN...NORTHWESTERN
LINCOLN AND SOUTHWESTERN PAYNE COUNTIES UNTIL 1230 AM CDT...

AT 1150 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES EAST OF
COYLE...MOVING NORTHEAST AT 25 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

LAT...LON 3585 9707 3591 9724 3612 9718 3611 9704
      3603 9693
TIME...MOT...LOC 0450Z 203DEG 22KT 3594 9714

MAD

Special weather statement, Oct 5, 11:55 PM CDT, 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1155 PM CDT WED OCT 5 2016

OKZ005-006-060530-
ALFALFA OK-WOODS OK-
1155 PM CDT WED OCT 5 2016

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL ALFALFA AND SOUTHEASTERN
WOODS COUNTIES UNTIL 1230 AM CDT...

AT 1153 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR LAMBERT...
MOVING NORTHEAST AT 50 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

LAT...LON 3685 9811 3667 9811 3647 9847 3646 9854
      3648 9859 3656 9860 3687 9823
TIME...MOT...LOC 0453Z 224DEG 41KT 3664 9839

MAD

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 5, 7:17 PM CDT	Special Weather Statement	OUN	Tillman	28 min
Oct 5, 10:06 PM CDT	Special Weather Statement	OUN	Kingfisher	24 min
Oct 5, 10:31 PM CDT	Special Weather Statement	OUN	Kingfisher	29 min
Oct 5, 10:35 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan, Noble	40 min
Oct 5, 10:58 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan, Noble	47 min
Oct 5, 11:03 PM CDT	Special Weather Statement	OUN	Blaine	27 min
Oct 5, 11:14 PM CDT	Special Weather Statement	OUN	Noble	31 min
Oct 5, 11:20 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Blaine, Garfield, Kingfisher, Major	40 min
Oct 5, 11:33 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant	42 min
Oct 5, 11:41 PM CDT	Special Weather Statement	OUN	Noble	34 min
Oct 5, 11:53 PM CDT	Special Weather Statement	OUN	Payne	37 min
Oct 5, 11:55 PM CDT	Special Weather Statement	OUN	Alfalfa	35 min
Oct 6, 12:36 AM CDT	Special Weather Statement	OUN	Kay	24 min
Oct 6, 12:42 AM CDT	Special Weather Statement	OUN	Grant	33 min
Oct 6, 12:44 AM CDT	Special Weather Statement	OUN	Alfalfa	31 min
Oct 6, 1:07 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	38 min
Oct 6, 1:33 AM CDT	Special Weather Statement	OUN	Custer	27 min
Oct 6, 1:41 AM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble	33 min
Oct 6, 2:17 AM CDT	Special Weather Statement	OUN	Kay	43 min
Oct 6, 2:26 AM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	34 min
Oct 6, 2:53 AM CDT	Areal Flood Advisory	OUN	Garfield, Grant, Kay, Noble	3 hr
Oct 6, 3:07 AM CDT	Special Weather Statement	OUN	Garfield, Grant, Kay	3 hr
Oct 6, 3:26 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	49 min
Oct 6, 3:31 AM CDT	Flash Flood Warning	OUN	Garfield, Grant, Kay, Noble	6 hr
Oct 6, 4:27 AM CDT	Flash Flood Warning	OUN	Kay	3 hr
Oct 6, 5:06 AM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble	39 min
Oct 6, 6:50 AM CDT	Special Weather Statement	OUN	Logan, Payne	25 min
Oct 6, 7:25 AM CDT	Flash Flood Warning	OUN	Kay, Noble	2 hr
Oct 6, 7:34 AM CDT	Flash Flood Warning	OUN	Logan, Noble, Payne	3 hr
Oct 6, 8:22 AM CDT	River Flood Warning	OUN	Grant, Kay, Noble	41 hr
Oct 6, 9:44 AM CDT	Areal Flood Warning	OUN	Garfield, Grant, Kay, Noble	3 hr
Oct 6, 10:05 AM CDT	Flood Watch	OUN	Garfield, Grant, Kay, Noble, Payne	14 hr
Oct 6, 2:25 PM CDT	Special Weather Statement	OUN	Kay	50 min
Oct 6, 3:27 PM CDT	Special Weather Statement	OUN	Grant	33 min
Oct 6, 3:32 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	28 min
Oct 6, 3:36 PM CDT	Special Weather Statement	OUN	Harmon	24 min
Oct 6, 3:49 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon	30 min
Oct 6, 4:12 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	48 min
Oct 6, 4:36 PM CDT	Special Weather Statement	OUN	Grant	9 min
Oct 6, 4:40 PM CDT	Special Weather Statement	OUN	Beckham	20 min
Oct 6, 4:47 PM CDT	Special Weather Statement	OUN	Grant	13 min
Oct 6, 4:50 PM CDT	Special Weather Statement	OUN	Custer	25 min
Oct 6, 4:54 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Washita	51 min
Oct 6, 4:57 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	48 min
Oct 6, 5:00 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey	45 min
Oct 6, 5:01 PM CDT	Special Weather Statement	OUN	Garfield	29 min
Oct 6, 5:21 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	54 min
Oct 6, 5:24 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Major, Woodward	51 min
Oct 6, 5:36 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Roger Mills	39 min
Oct 6, 5:44 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	46 min
Oct 6, 5:52 PM CDT	Special Weather Statement	OUN	Woods	53 min
Oct 6, 6:09 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant, Major, Woods, Woodward	66 min
Oct 6, 6:13 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	47 min
Oct 6, 6:15 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	60 min
Oct 6, 6:20 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Dewey, Roger Mills, Washita	40 min
Oct 6, 6:30 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Custer, Dewey	19 min
Oct 6, 6:36 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	39 min
Oct 6, 6:41 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Roger Mills	34 min
Oct 6, 6:57 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	48 min
Oct 5, 7:10 PM CDT	Special Weather Statement	OUN	Knox	35 min
Oct 5, 7:26 PM CDT	Special Weather Statement	OUN	Baylor	49 min
Oct 5, 7:50 PM CDT	Special Weather Statement	OUN	Baylor	25 min
Oct 6, 3:24 PM CDT	Severe Thunderstorm Warning	OUN	Hardeman	51 min
Oct 6, 4:47 PM CDT	Flash Flood Warning	OUN	Hardeman	3 hr
Oct 6, 6:29 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	46 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2016 Every severe thunderstorm warning in 2016

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.