Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 632, NWS Norman, OK

July 9, 2016Alfalfa County, Woods County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 9, 2016, 6:55 PM CDT for Alfalfa County, Woods County, Oklahoma. It was in force for 50 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
Jul 9, 2016, 6:55 PM CDT (23:55 UTC)
Expired
Jul 9, 2016, 7:45 PM CDT
In force
50 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Hail
1.5 in
Wind
70.0 mph

Counties Alfalfa County, OK, Woods County, OK

The radar

The Vance AFB radar (KVNX), 42 km from the middle of the area, began a volume at 23:57 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 12:00Z, 11.9 hours before the alert went out and 201 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, Norman, OK at 12:00Z on 2016-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1428 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, Norman, OK at 12:00Z on 2016-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 210 square meters per square second.1939Sfc1 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
1428 J/kg
Mixed-layer CIN
-124 J/kg
Mixed-layer LCL
1061 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
210 m²/s²
0-3 km storm-relative helicity
269 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Jul 9, 6:25 PM CDT, 30 minutes earlier.

Area forecast discussion, Jul 9, 6:25 PM CDT, 30 minutes before
Area Forecast Discussion
National Weather Service Norman OK
625 PM CDT SAT JUL 9 2016

.DISCUSSION...
0Z TAF discussion below.

&&

.AVIATION...
VFR conditions expected. Isolated storms are possible this evening
but too difficult to forecast whether will affect a TAF site. If
do occur, strong and variable wind gusts will be possible. Storms
developing west of the area may affect parts of western OK and/or
western north TX. However, current thoughts are that this activity
will remain west so don't have mention in TAFs for now.

&&

.PREV DISCUSSION... /issued 233 PM CDT SAT JUL 9 2016/

DISCUSSION...
Determining rain chances over the next several days is the
challenge of the day. Summer heat will continue.

Before midnight tonight, believe a few thunderstorms will remain
across the area, though storm coverage should be rather low due to
weak subsidence behind a mid/upper trough that is over
southeastern Oklahoma. Generally only went 10-20% rain chances
this evening with higher chances 40-90% this afternoon near the
Red River east of Wichita Falls. Current complex of storms along
the Red River near and east of I-35 as of 230 PM will continue to
push south into north Texas. Believe a few additional storms may
form on lingering outflow boundaries mainly southeast of I-44
where deepest moisture exists with precipitable water values
1.7-2". Any storm should be slow moving which can dump a few
inches of rainfall in small areas. Severe potential is low, though
cannot rule out damaging winds up to 60 mph if storms occur as
daytime heating supports DCAPE values of 1000-1800 J/kg.

After midnight tonight, a few storms may linger closer to the
departing mid/upper trough and where moisture convergence may be
stronger in southeastern Oklahoma. A complex or two of storms may
occur across the High Plains and get into far western Oklahoma and
far western north Texas, though it appears the greater chances for
this to occur will be over the Panhandles.

Sunday looks to be another hot and humid day with even lower rain
chances than today as the cap strengthens. Head indices may
approach 105 degrees in some areas. Did not issue a Heat Advisory
as not sure how high surface dewpoints will be. Cannot completely
rule out a stray afternoon and evening storm, but chances appear
to be too low to mention, generally below 15%.

Sunday night into Monday, there is a slight signal that storms
over the High Plains may make into the area, but confidence is
very low. Hot and humid conditions will continue. Surface winds
will increase on Monday.

Monday night through Friday, no signficant changes in the weather
pattern are expected with continued hot weather along with low
chances for showers and storms. A weak front may approach Kansas
or northern Oklahoma during this time frame which could serve as a
focus for higher rain chances. Chances of widespread rainfall
remain low during this time frame.

MBS

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  73  93  75  95 /  20  10  10  10
Hobart OK         75  98  77  99 /  20  10  10  10
Wichita Falls TX  76  98  77  99 /  20  10  10  10
Gage OK           72  98  76  98 /  10  10  10  10
Ponca City OK     74  95  76  95 /  10  10  10  10
Durant OK         75  92  75  95 /  20  20  10   0

&&

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

25/20/20
Hazardous weather outlook, Jul 9, 12:03 PM CDT, 6 hours 52 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1203 PM CDT SAT JUL 9 2016

OKZ004>048-050>052-TXZ083>090-101000-
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-
1203 PM CDT SAT JUL 9 2016

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...

.THUNDERSTORMS...
THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON
AND EVENING ACROSS PART OF OKLAHOMA AND WESTERN NORTH TEXAS.

THE BEST OPPORTUNITY FOR STRONG TO SEVERE STORMS WILL BE ALONG
A SOUTH OF A WOODWARD TO OKLAHOMA CITY AND MCALESTER LINE.

ISOLATED TO WIDELY SCATTERED THUNDERSTORMS WILL REMAIN POSSIBLE THIS
AFTERNOON AND EVENING...ESPECIALLY ACROSS THE SOUTHERN HALF OF
OKLAHOMA AND WESTERN NORTH TEXAS.  THUNDERSTORM CHANCES WILL GRADUALLY
DECREASE DURING THE EVENING...AS A MID LEVEL TROUGH MOVES SOUTH AND
EAST OF OKLAHOMA.

THE STRONGER STORMS THIS AFTERNOON WILL BE CAPABLE OF VERY HEAVY
RAINFALL AND STRONG WIND GUSTS BETWEEN 60 AND 70 MPH. QUARTER
TO HALF DOLLAR SIZE HAIL WILL ALSO BE POSSIBLE.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL SHOULD
PREPARE FOR SEVERE WEATHER OPERATIONS THIS AFTERNOON AND EVENING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

.THUNDERSTORMS...
THUNDERSTORMS WILL BE POSSIBLE EVERY DAY FROM SUNDAY THROUGH
FRIDAY. HOWEVER...NO ORGANIZED SEVERE WEATHER IS EXPECTED AT THIS
TIME.

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, Jul 9, 4:46 PM CDT, 2 hours 9 minutes before
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Special weather statement, Jul 9, 5:46 PM CDT, 1 hour 9 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
546 PM CDT SAT JUL 9 2016

OKZ006-007-012-092315-
GRANT OK-ALFALFA OK-GARFIELD OK-
546 PM CDT SAT JUL 9 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN GRANT...SOUTHERN
ALFALFA AND NORTHWESTERN GARFIELD COUNTIES UNTIL 615 PM CDT...

AT 543 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR GREAT SALT
PLAINS LAKE...MOVING SOUTHEAST AT 5 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 50 MPH...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

&&

LAT...LON 3685 9802 3647 9787 3646 9830 3646 9833
      3671 9845 3686 9827
TIME...MOT...LOC 2243Z 302DEG 3KT 3670 9824
Special weather statement, Jul 9, 6:00 PM CDT, 55 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
600 PM CDT SAT JUL 9 2016

OKZ023-024-092330-
CANADIAN OK-CADDO OK-
600 PM CDT SAT JUL 9 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN CANADIAN AND
NORTHEASTERN CADDO COUNTIES UNTIL 630 PM CDT...

AT 559 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 7 MILES NORTHWEST
OF COGAR...MOVING SOUTH AT 5 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 50 MPH...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

&&

LAT...LON 3537 9841 3551 9825 3541 9803 3538 9806
      3538 9810 3534 9810 3524 9818
TIME...MOT...LOC 2259Z 20DEG 4KT 3541 9823
Special weather statement, Jul 9, 6:03 PM CDT, 52 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
603 PM CDT SAT JUL 9 2016

OKZ017-018-092330-
BLAINE OK-KINGFISHER OK-
603 PM CDT SAT JUL 9 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BLAINE AND
NORTHWESTERN KINGFISHER COUNTIES UNTIL 630 PM CDT...

AT 601 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES SOUTHEAST
OF OKEENE...MOVING EAST AT 5 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 50 MPH...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

&&

LAT...LON 3615 9832 3609 9810 3583 9819 3590 9848
TIME...MOT...LOC 2301Z 279DEG 3KT 3605 9825
Special weather statement, Jul 9, 6:24 PM CDT, 31 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
624 PM CDT SAT JUL 9 2016

TXZ088-089-100000-
ARCHER TX-BAYLOR TX-
624 PM CDT SAT JUL 9 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN ARCHER AND EASTERN
BAYLOR COUNTIES UNTIL 700 PM CDT...

AT 622 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES SOUTHEAST
OF LAKE KICKAPOO. ANOTHER STRONG THUNDERSTORM WAS LOCATED NEAR
MABELLE. THESE STORM WERE NEARLY STATIONARY.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 50 MPH...

LAT...LON 3375 9919 3363 9862 3340 9865 3352 9931
TIME...MOT...LOC 2322Z 28DEG 1KT 3357 9877
Special weather statement, Jul 9, 6:51 PM CDT, 4 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
651 PM CDT SAT JUL 9 2016

OKZ017-018-100015-
BLAINE OK-KINGFISHER OK-
651 PM CDT SAT JUL 9 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BLAINE AND
NORTHWESTERN KINGFISHER COUNTIES UNTIL 715 PM CDT...

AT 649 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 4 MILES SOUTHEAST
OF OKEENE. THIS STORM WAS NEARLY STATIONARY.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 50 MPH...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

&&

LAT...LON 3615 9813 3597 9817 3600 9836 3616 9845
      3617 9840
TIME...MOT...LOC 2349Z 329DEG 2KT 3609 9825

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 8, 7:07 PM CDTSpecial Weather StatementOUNJackson23 min
Jul 8, 7:14 PM CDTSpecial Weather StatementOUNPottawatomie, Seminole31 min
Jul 8, 7:16 PM CDTSevere Thunderstorm WarningOUNJackson, Tillman44 min
Jul 8, 7:19 PM CDTSevere Thunderstorm WarningOUNPottawatomie, Seminole26 min
Jul 8, 7:35 PM CDTSpecial Weather StatementOUNGrady25 min
Jul 8, 7:43 PM CDTSevere Thunderstorm WarningOUNHughes, Pontotoc, Pottawatomie, Seminole32 min
Jul 8, 7:58 PM CDTSevere Thunderstorm WarningOUNComanche, Cotton, Tillman47 min
Jul 8, 8:00 PM CDTSpecial Weather StatementOUNCleveland30 min
Jul 8, 8:01 PM CDTSpecial Weather StatementOUNGrady29 min
Jul 8, 8:16 PM CDTSpecial Weather StatementOUNPontotoc29 min
Jul 8, 8:32 PM CDTAreal Flood AdvisoryOUNComanche, Cotton, Kiowa, Tillman118 min
Jul 8, 8:37 PM CDTSpecial Weather StatementOUNHughes23 min
Jul 9, 9:41 AM CDTSpecial Weather StatementOUNCoal34 min
Jul 9, 10:21 AM CDTAreal Flood AdvisoryOUNAtoka, Bryan, Coal, Johnston, Marshall114 min
Jul 9, 10:25 AM CDTSpecial Weather StatementOUNCoal35 min
Jul 9, 11:00 AM CDTSpecial Weather StatementOUNCoal30 min
Jul 9, 11:05 AM CDTFlash Flood WarningOUNCoal115 min
Jul 9, 12:40 PM CDTFlash Flood WarningOUNAtoka, Bryan, Coal, Johnston, Marshall3 hr
Jul 9, 1:03 PM CDTSpecial Weather StatementOUNBryan27 min
Jul 9, 1:12 PM CDTSpecial Weather StatementOUNCarter33 min
Jul 9, 1:48 PM CDTSpecial Weather StatementOUNLove27 min
Jul 9, 2:10 PM CDTSpecial Weather StatementOUNLove35 min
Jul 9, 2:23 PM CDTAreal Flood AdvisoryOUNLove112 min
Jul 9, 2:51 PM CDTFlash Flood WarningOUNLove114 min
Jul 9, 2:58 PM CDTSpecial Weather StatementOUNLove17 min
Jul 9, 3:11 PM CDTSpecial Weather StatementOUNJefferson34 min
Jul 9, 5:46 PM CDTSpecial Weather StatementOUNAlfalfa29 min
Jul 9, 6:00 PM CDTSpecial Weather StatementOUNCaddo30 min
Jul 9, 6:03 PM CDTSpecial Weather StatementOUNBlaine27 min
Jul 9, 6:12 PM CDTSevere Thunderstorm WarningOUNAlfalfa48 min
Jul 9, 6:49 PM CDTAreal Flood AdvisoryOUNAlfalfa3 hr
Jul 9, 6:51 PM CDTSpecial Weather StatementOUNBlaine24 min
Jul 9, 1:33 PM CDTSpecial Weather StatementOUNGrayson27 min
Jul 9, 3:43 PM CDTSpecial Weather StatementOUNClay32 min
Jul 9, 3:59 PM CDTSevere Thunderstorm WarningOUNClay46 min
Jul 9, 4:46 PM CDTSpecial Weather StatementOUNClay29 min
Jul 9, 4:55 PM CDTSevere Thunderstorm WarningOUNClay50 min
Jul 9, 6:24 PM CDTSpecial Weather StatementOUNArcher, Baylor36 min
Jul 9, 6:57 PM CDTSevere Thunderstorm WarningOUNBaylor30 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2016Every 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.