Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 764, NWS Norman, OK

October 29, 2009Coal County, Hughes County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 29, 2009, 11:28 AM CDT for Coal County, Hughes County, Oklahoma. It was in force for 62 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 29, 2009, 11:28 AM CDT (16:28 UTC)
Expired: Oct 29, 2009, 12:30 PM CDT
In force: 62 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Coal County, OK, Hughes County, OK

The radar

The Norman radar (KTLX), 108 km from the middle of the area, began a volume at 16:29 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 watch it was issued in

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

Issued	Product	Office	Lasted
Oct 29, 6:43 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 4.5 hours before the alert went out and 112 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: 1863 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 515 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 326 m²/s²
0-3 km storm-relative helicity: 380 m²/s²
Significant tornado parameter: 4.6
Supercell composite: 19.6

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 29, 10:09 AM CDT, 1 hour 19 minutes earlier.

Area forecast discussion, Oct 29, 10:09 AM CDT, 1 hour 19 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
1009 AM CDT THU OCT 29 2009

.DISCUSSION...
THE LINE OF STORMS THAT HAS CROSSED MOST OF OUR FORECAST AREA NOW
LIES FROM NEAR HOLDENVILLE TO MADILL... AND CONTINUES TO MOVE
EAST... ALTHOUGH AT A SOMEWHAT DIMINISHED SPEED. THE SURFACE COLD
FRONT IS LOCATED NEAR THE LINE OF STORMS. ALOFT... THE LARGE WAVE
THAT IS SUPPORTING ALL THIS ACTION IS CENTERED NEAR THE BORDER
BETWEEN COLORADO AND NEW MEXICO. IT IS FORECAST TO MOVE EAST TODAY
AND TONIGHT... AND WILL LIKELY SUPPORT CONTINUED CONVECTION
THROUGH TONIGHT... MAINLY IN THE FORM OF RAIN SHOWERS AFTER THIS
AFTERNOON.

THE EXISTING FORECAST IS GENERALLY IN GOOD SHAPE... BUT WE HAVE
MADE SOME MODIFICATIONS TO RAIN CHANCES AND WEATHER TYPES TO
ACCOUNT FOR THE CURRENT EXPECTATIONS AND TRENDS.

&&

.PREV DISCUSSION... /ISSUED 328 AM CDT THU OCT 29 2009/

DISCUSSION...
LARGE STORM SYSTEM WILL MAKE ITS WAY SLOWLY EAST AND NORTHEAST
ACROSS THE SOUTHERN PLAINS TODAY INTO TONIGHT. LATEST RUNS HAVE
SLOWED THINGS DOWN A BIT. THIS IS MAINLY DUE TO THE MODELS WANTING TO
CLOSE THE UPPER LOW OFF QUICKER AND EJECT THE INITIAL PIECE OF
ENERGY TO THE NORTH MORE SLOWLY WITH A FURTHER WEST STARTING POINT.
WILL THEREFORE KEEP POPS BACK FURTHER WEST AND LINGER THEM ACROSS
THE NORTH THROUGH TONIGHT.

SECONDARY LOBE OF ENERGY IS STILL FORECAST TO MOVE OUT OF THE BIG
BEND AREA AND SLIDE EAST AND NORTHEAST ON FRIDAY. THIS COULD PROVIDE
ENOUGH LIFT FOR A FEW SHOWERS ACROSS PARTS OF SOUTHERN AND
SOUTHEASTERN OK ON FRI.

THIS MOVES BY AND WE GET INTO NORTHWEST FLOW PATTERN WHICH GRADUALLY
TRANSLATES EAST AS UPPER RIDGE BUILDS EAST OUT INTO THE PLAINS BY
THE MIDDLE OF NEXT WEEK. THIS SHOULD PROVIDE A MORE TRANQUIL
WEATHER PATTERN FOR OKLAHOMA AND WESTERN NORTH TEXAS WITH NEAR
SEASONAL TEMPERATURES THROUGH THE REMAINDER OF THE FORECAST AND
PERHAPS BEYOND.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  65  41  59  41 / 100  20  20  10
HOBART OK         59  41  62  41 /  40  10  10   0
WICHITA FALLS TX  68  45  65  41 /  70  10  20   0
GAGE OK           51  36  58  35 /  50  20   0   0
PONCA CITY OK     65  45  55  42 / 100  40  10  10
DURANT OK         77  48  65  44 / 100  30  30  10

&&

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

23/06

Hazardous weather outlook, Oct 29, 11:10 AM CDT, 18 minutes before

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In the hours before

Special weather statement, Oct 29, 6:18 AM CDT, 5 hours 10 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
618 AM CDT THU OCT 29 2009

OKZ008-013-019-020-025>030-039-040-045-046-TXZ090-291145-
LINCOLN OK-LOGAN OK-NOBLE OK-KAY OK-OKLAHOMA OK-POTTAWATOMIE OK-
PAYNE OK-CLEVELAND OK-GRADY OK-MCCLAIN OK-JEFFERSON OK-GARVIN OK-
CARTER OK-STEPHENS OK-CLAY TX-
618 AM CDT THU OCT 29 2009

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR CARTER...CLAY...CLEVELAND...
GARVIN...GRADY...JEFFERSON...KAY...LINCOLN...LOGAN...MCCLAIN...
NOBLE...OKLAHOMA...PAYNE...POTTAWATOMIE AND STEPHENS COUNTIES.

AT 618 AM CDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM PONCA
CITY... TO STILLWATER... TO GUTHRIE AND THE OKLAHOMA CITY METRO
SOUTH TO LINDSEY... TO DUNCAN... TO SUGDEN...MOVING NORTHEAST AT 40
MPH.

HAZARDS INCLUDE...
WIND GUSTS TO 50 MPH...
FREQUENT CLOUD TO GROUND LIGHTNING...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

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

LAT...LON 3675 9682 3675 9689 3669 9694 3669 9706
      3660 9704 3661 9691 3658 9688 3651 9703
      3635 9702 3634 9692 3626 9689 3592 9694
      3511 9719 3400 9774 3408 9815 3475 9793
      3555 9758 3606 9744 3690 9741 3696 9679

30

Local storm report, Oct 29, 6:57 AM CDT, 4 hours 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
657 AM CDT THU OCT 29 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0644 AM     TSTM WND DMG     4 W LOCO                34.33N 97.75W
10/29/2009                   STEPHENS           OK   AMATEUR RADIO

            8 INCH DIAMETER TREE DOWNED

&&

JPIKE

Special weather statement, Oct 29, 7:04 AM CDT, 4 hours 24 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
704 AM CDT THU OCT 29 2009

OKZ019-020-025-026-028>030-040-291230-
LINCOLN OK-LOGAN OK-OKLAHOMA OK-POTTAWATOMIE OK-PAYNE OK-CLEVELAND
OK-MCCLAIN OK-GARVIN OK-
704 AM CDT THU OCT 29 2009

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR CLEVELAND...GARVIN...
LINCOLN...LOGAN...MCCLAIN...OKLAHOMA...PAYNE AND POTTAWATOMIE
COUNTIES.

AT 703 AM CDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM NEAR
STILLWATER SOUTH TO MCLOUD... TO PURCELL... TO WAYNE AND ELMORE
CITY...MOVING NORTHEAST AT 50 MPH.

HAZARDS INCLUDE...
WIND GUSTS TO 50 MPH...
FREQUENT CLOUD TO GROUND LIGHTNING...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

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

LAT...LON 3467 9710 3455 9756 3607 9719 3603 9667

30

Special weather statement, Oct 29, 7:43 AM CDT, 3 hours 45 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
743 AM CDT THU OCT 29 2009

OKZ020-026-028-030-031-040>042-045-046-050-291315-
LOVE OK-LINCOLN OK-POTTAWATOMIE OK-SEMINOLE OK-PAYNE OK-MCCLAIN OK-
JEFFERSON OK-MURRAY OK-GARVIN OK-PONTOTOC OK-CARTER OK-
743 AM CDT THU OCT 29 2009

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR CARTER...GARVIN...
JEFFERSON...LINCOLN...LOVE...MCCLAIN...MURRAY...PAYNE...PONTOTOC...
POTTAWATOMIE AND SEMINOLE COUNTIES.

AT 742 AM CDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 4
NEAR YALE SOUTH TO CUSHING... TO CHANDLER... TO SHAWNEE... TO
BYARS... TO TURNER FALLS.. TO NEAR ARDMORE...MOVING NORTHEAST AT 50
MPH.

HAZARDS INCLUDE...
WIND GUSTS TO 40 MPH...
FREQUENT CLOUD TO GROUND LIGHTNING...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

SEVERE WEATHER IS NOT EXPECTED AND NO WARNINGS ARE ANTICIPATED AT
THIS TIME.

LAT...LON 3397 9760 3398 9765 3452 9741 3494 9717
      3494 9714 3616 9704 3616 9661 3541 9661
      3541 9656 3544 9655 3538 9655 3394 9717
      3391 9760

30

Special weather statement, Oct 29, 8:35 AM CDT, 2 hours 53 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
835 AM CDT THU OCT 29 2009

OKZ031-032-041-042-047-291400-
SEMINOLE OK-HUGHES OK-MURRAY OK-JOHNSTON OK-PONTOTOC OK-
835 AM CDT THU OCT 29 2009

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR HUGHES...JOHNSTON...
MURRAY...PONTOTOC AND SEMINOLE COUNTIES.

AT 834 AM CDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
NEAR STROUD TO SEMINOLE TO 7 MILES WEST OF ADA AND SULPHUR.
THE STORM WERE MOVING NORTHEAST AT 40 MPH.

HAZARDS INCLUDE...
WIND GUSTS TO 40 TO 50 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

LAT...LON 3473 9645 3439 9692 3544 9652 3546 9647
      3546 9643 3530 9643 3530 9624

Special weather statement, Oct 29, 9:08 AM CDT, 2 hours 20 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
908 AM CDT THU OCT 29 2009

OKZ031-032-041-042-047-291430-
SEMINOLE OK-HUGHES OK-MURRAY OK-JOHNSTON OK-PONTOTOC OK-
908 AM CDT THU OCT 29 2009

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR HUGHES...JOHNSTON...
MURRAY...PONTOTOC AND SEMINOLE COUNTIES.

AT 907 AM CDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 9
MILES NORTHEAST OF CROMWELL TO WEWOKA TO ADA AND SULPHUR.  THE
STORMS WERE MOVING NORTHEAST AT 50 MPH.

HAZARDS INCLUDE...
WIND GUSTS TO 40 TO 50 MPH...
FREQUENT CLOUD TO GROUND LIGHTNING...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

LAT...LON 3479 9632 3477 9636 3478 9640 3474 9640
      3440 9691 3539 9644 3538 9643 3530 9643
      3530 9618 3529 9617

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 29, 6:29 AM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	31 min
Oct 29, 6:40 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Murray, Stephens	50 min
Oct 29, 10:34 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc, Seminole	41 min
Oct 29, 10:37 AM CDT	Tornado Warning	OUN	Hughes	38 min
Oct 29, 10:53 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc	37 min
Oct 29, 2:48 PM CDT	River Flood Warning	OUN	Blaine, Caddo, Canadian, Custer	5 hr
Oct 29, 2:48 PM CDT	River Flood Warning	OUN	Pottawatomie, Seminole	5 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2009 Every severe thunderstorm warning in 2009

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.