Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 227, NWS Norman, OK

April 30, 20124 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 30, 2012, 11:57 PM CDT for 4 counties in Oklahoma. It was in force for 48 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: Apr 30, 2012, 11:57 PM CDT (04:57 UTC)
Expired: May 1, 2012, 12:45 AM CDT
In force: 48 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Cleveland County, OK, Lincoln County, OK, Oklahoma County, OK, Pottawatomie County, OK

The radar

The Norman radar (KTLX), 19 km from the middle of the area, began a volume at 04:59 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 1, 12:00 AM CDT	TSTM WND DMG	Harrah, OK	3FT DIAMTER TREE BLOWN OVER
May 1, 12:00 AM CDT	HAIL 1	Harrah, OK
May 1, 12:33 AM CDT	TSTM WND DMG	6 Ssw Choctaw, OK	POWER LINES DOWN NEAR THE INTERSTATE 40 AND 240 INTERCHANGE. REPORTED BY OKC FIRE DISPATCH.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 3 storm reports to this severe thunderstorm warning; the first came 3 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 30, 9:51 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 5.0 hours before the alert went out and 36 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: 2178 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1251 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 10.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

968 
WUUS54 KOUN 010457
SVROUN

OKC027-081-109-125-010545-
/O.NEW.KOUN.SV.W.0227.120501T0457Z-120501T0545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
1157 PM CDT MON APR 30 2012

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTH CENTRAL CLEVELAND COUNTY IN  OKLAHOMA...
  LINCOLN COUNTY IN  OKLAHOMA...
  OKLAHOMA COUNTY IN  OKLAHOMA...
  EXTREME NORTHERN POTTAWATOMIE COUNTY IN  OKLAHOMA...

* UNTIL 1245 AM CDT

* AT 1154 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS 
  DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE 
  HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS 
  LOCATED NEAR CHOCTAW...MOVING EAST AT 35 MPH. 

* LOCATIONS IMPACTED INCLUDE...
  CHOCTAW...HARRAH...SPENCER...MCLOUD...JONES...NICOMA PARK...
  MEEKER...WELLSTON...
  WARWICK AND AYDELOTTE. 

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 240 BETWEEN MILE MARKERS 13 AND 16.
 INTERSTATE 40 BETWEEN MILE MARKERS 160 AND 174.
 INTERSTATE 44 BETWEEN MILE MARKERS 152 AND 164.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE INSIDE A STURDY BUILDING UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3535 9733 3551 9741 3576 9696 3543 9681
TIME...MOT...LOC 0454Z 250DEG 31KT 3548 9722 

$$

2 follow-up statements

311 
WWUS54 KOUN 010526
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1226 AM CDT TUE MAY 1 2012

OKC027-081-109-125-010545-
/O.CON.KOUN.SV.W.0227.000000T0000Z-120501T0545Z/
LINCOLN OK-OKLAHOMA OK-CLEVELAND OK-POTTAWATOMIE OK-
1226 AM CDT TUE MAY 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM 
CDT FOR SOUTHWESTERN LINCOLN...SOUTHEASTERN OKLAHOMA...EXTREME 
NORTH CENTRAL CLEVELAND AND EXTREME NORTHERN POTTAWATOMIE COUNTIES...

AT 1222 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE 
HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE 
LOCATED ALONG A LINE EXTENDING FROM MIDWEST CITY TO MEEKER...
MOVING NORTHEAST AT 25 MPH. IN ADDITION...VERY HEAVY RAIN 
MAY CAUSE MINOR FLOODING OF LOW LYING OR POOR DRAINAGE AREAS.

LOCATIONS IMPACTED INCLUDE...
CHOCTAW...HARRAH...SPENCER...MCLOUD...NICOMA PARK...MEEKER AND 
AYDELOTTE. 

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 240 BETWEEN MILE MARKERS 13 AND 16.
 INTERSTATE 40 BETWEEN MILE MARKERS 160 AND 175.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE INSIDE A STURDY BUILDING UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3535 9733 3551 9741 3570 9694 3543 9681
TIME...MOT...LOC 0522Z 231DEG 20KT 3543 9733 3550 9694 

$$

124 
WWUS54 KOUN 010543
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1243 AM CDT TUE MAY 1 2012

OKC081-027-125-109-010555-
/O.EXP.KOUN.SV.W.0227.000000T0000Z-120501T0545Z/
LINCOLN OK-OKLAHOMA OK-CLEVELAND OK-POTTAWATOMIE OK-
1243 AM CDT TUE MAY 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN LINCOLN...
SOUTHEASTERN OKLAHOMA...EXTREME NORTH CENTRAL CLEVELAND AND 
EXTREME NORTHERN POTTAWATOMIE COUNTIES WILL EXPIRE AT 1245 AM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAD WEAKENED...AND 
WAS NO LONGER SEVERE. THEREFORE THE WARNING WILL BE ALLOWED TO 
EXPIRE.  HOWEVER SMALL HAIL....GUSTY WINDS AND HEAVY RAIN ARE 
STILL POSSIBLE WITH THESE THUNDERSTORMS AS THEY MOVE THROUGH 
SOUTHERN LINCOLN AND NORTHERN POTTAWATOMIE COUNTIES.

LAT...LON 3535 9733 3551 9741 3570 9694 3543 9681
TIME...MOT...LOC 0543Z 250DEG 31KT 3543 9733 3550 9694 

$$

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 30, 6:56 PM CDT, 5 hours 1 minute earlier.

Area forecast discussion, Apr 30, 6:56 PM CDT, 5 hours 1 minute before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
656 PM CDT MON APR 30 2012

.AVIATION...
0Z TAFS... SCATTERED SHOWERS/STORMS WILL MOVE ACROSS THE AREA
TONIGHT INTO TUESDAY MORNING. THE MOST LIKELY LOCATIONS TO
RECEIVE STORMS WILL BE ACROSS NORTHERN OK. STRONG VARIABLE WINDS
WILL BE POSSIBLE NEAR ANY THUNDERSTORMS. MVFR CEILINGS WILL BE
LIKELY AT MOST SITES TONIGHT WITH CEILINGS GRADUALLY LIFT TUESDAY.

&&

.PREV DISCUSSION... /ISSUED 351 PM CDT MON APR 30 2012/

DISCUSSION...
DEWPOINTS IN THE MID TO UPPER 60S AND TEMPS IN THE LOW 80S THIS
AFTERNOON ARE RESULTING IN AT LEAST MODERATE INSTABILITY ACROSS
MOST OF THE FA. SOME ONGOING MOIST CONVECTION IS DRIFTING
NORTHEASTWARD ACROSS SOUTHEASTERN OKLAHOMA AT THE MOMENT...AND
ADDITIONAL DEVELOPMENT CAN BE EXPECTED LATER THIS EVENING ACROSS
NORTHERN...WESTERN...AND SOUTHWESTERN OKLAHOMA...AND WESTERN NORTH
TEXAS. IT IS DIFFICULT TO DETERMINE THE EXACT SCENARIO FOR THIS
EVENING...BUT IT DOES APPEAR A COUPLE OF LOCATIONS WILL BE FAVORED
THIS EVENING. THE FIRST MAY BE ACROSS NORTHERN OKLAHOMA AS A
SHORTWAVE TROUGH TRAVERSES THE AREA. THE SECOND MAY BE ACROSS
SOUTHWESTERN OK AND WESTERN NORTH TEXAS IF STORMS CAN MANAGE TO
1..DEVELOP ALONG A DIFFUSE OUTFLOW BOUNDARY OR 2...MOVE INTO THE
REGION FROM THE WEST AS THEY DEVELOP ALONG THE DRYLINE. EITHER
WAY...A HAIL THREAT WILL DEFINITELY BE PRESENT THROUGH THE EVENING
HOURS WITH THE AFOREMENTIONED INSTABILITY PRESENT AND EFFECTIVE
BULK SHEAR > 45 KT. IN ADDITION...FLASH FLOODING WILL ALSO BE A
CONCERN WITH PWAT VALUES EXCEEDING 1 INCH. THIS WILL ESPECIALLY BE
TRUE ACROSS NORTHERN OKLAHOMA WHERE SOME LOCATIONS HAVE ALREADY
RECEIVED OVER 8 INCHES OF RAIN FROM YESTERDAY/S ACTIVITY. THE
FLOOD WATCH WILL CONTINUE THROUGH THE OVERNIGHT HOURS FOR NORTHERN
OK.

RAIN CHANCES WILL END FROM WEST TO EAST EARLY TOMORROW MORNING.
SLIGHTLY WEAKER WSW MID LEVEL FLOW WILL CONTINUE OVERHEAD
TOMORROW...BUT THERE WILL BE VERY LITTLE TO NO MID LEVEL SUPPORT
WITHIN THIS FLOW. HOWEVER...WE DID INCLUDE AN ISOLATED MENTION OF
THUNDER ALONG THE DRYLINE TOMORROW AFT/EVE ACROSS FAR WESTERN OK
AND WESTERN NORTH TX. WEDNESDAY WILL ALSO BE SIMILAR TO TUESDAY
WITH PERHAPS A WEAK MID LEVEL SHORTWAVE TROUGH MOVING OVER THE
PANHANDLE REGION SO WE WILL ALSO INCLUDE ISO THUNDER ACROSS A
SIMILAR REGION. A WARM UP IS STILL ANTICIPATED THROUGH THE REST
OF THE WORK WEEK...WITH VERY LITTLE TO NO RAIN CHANCES FOR MOST
LOCATIONS.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  67  83  67  84 /  50  10  10  10
HOBART OK         65  85  65  89 /  50  10  10  20
WICHITA FALLS TX  67  86  67  88 /  50  10  10  20
GAGE OK           62  90  63  92 /  40  20  20  20
PONCA CITY OK     64  81  68  81 /  60  20  10  10
DURANT OK         66  82  66  84 /  30  20  10  10

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...FLASH FLOOD WATCH THROUGH TUESDAY MORNING FOR OKZ005>008-010>013.

TX...NONE.
&&

02/25/25

Hazardous weather outlook, Apr 30, 10:00 PM CDT, 1 hour 57 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1000 PM CDT MON APR 30 2012

OKZ004>048-050>052-TXZ083>090-011100-
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-
1000 AM CDT MON APR 30 2012

THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.

.DAY ONE...TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT
ACROSS PORTIONS OF OKLAHOMA AND WESTERN NORTH TEXAS.

LOCATION...
THE SLIGHT RISK AREA INCLUDES ALL OF WESTERN NORTH TEXAS AND THE
PART OF OKLAHOMA NORTHWEST OF A COLAGATE TO MADILL LINE.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE THROUGH
ABOUT 3 AM.

IMPACTS...
VERY LARGE HAIL... LARGER THAN BASEBALLS...DAMAGING WINDS GREATER
THAN 65 MPH... AND ISOLATED TORNADOES.

HEAVY RAIN AND LOCALIZED FLOODING WILL ALSO BE A CONCERN...
ESPECIALLY OVER THE NORTHERN THIRD TO HALF OF OKLAHOMA.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS INTO THE
OVERNIGHT HOURS.

DISCUSSION...
SCATTERED STRONG TO SEVERE THUNDERSTORMS CONTINUE TO DEVELOP AND
MOVE ACROSS OKLAHOMA AND WESTERN NORTH TEXAS. ONE CLUSTER OF STORMS
WILL CONTINUE TO MOVE THROUGH NORTHERN OKLAHOMA WITH
ANOTHER MOVING THROUGH SOUTHWEST OKLAHOMA AND WESTERN NORTH
TEXAS. A MOIST AND UNSTABLE AIRMASS REMAINS IN PLACE AND THE THREAT
FOR SEVERE STORMS WILL CONTINUE WELL INTO THE NIGHT. HAIL TO THE
SIZE OF BASEBALLS AND DAMAGING WIND GUSTS WILL BE THE MAIN THREATS.
TORNADOES WILL BE POSSIBLE...ALTHOUGH THE TORNADO THREAT WILL BEGIN
TO DIMINISH LATER TONIGHT.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT TUESDAY MAY 1.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...70 PERCENT.

OTHER HAZARDOUS WEATHER...
THUNDERSTORMS WILL PRODUCE LOCALLY HEAVY RAINFALL WHICH COULD LEAD
TO FLASH FLOODING... ESPECIALLY ACROSS NORTHERN OKLAHOMA WHERE
SIGNIFICANT RAINFALL OCCURRED ON SUNDAY AND EARLY MONDAY.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

THUNDERSTORM OUTLOOK...
THUNDERSTORMS MAY LINGER AFTER SUNRISE ON TUESDAY MORNING ACROSS
NORTH CENTRAL OKLAHOMA... ALTHOUGH SEVERE WEATHER IS NOT EXPECTED.
OTHERWISE... THUNDERSTORM CHANCES REMAIN VERY LOW THROUGH SUNDAY.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 5 AM TUESDAY.

In the hours before

Local storm report, Apr 30, 10:53 PM CDT, 1 hour 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1053 PM CDT MON APR 30 2012

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

1000 PM     TSTM WND GST     2 NW KNOX CITY          33.44N 99.84W
04/30/2012  M74 MPH          KNOX               TX   MESONET

            ROOF DAMAGE AT KNOX CITY HOSPITAL. TRAMPOLINES HANGING
            FROM POWER LINES. NUMEROUS POWER OUTAGES. REPORTED BY
            KNOX COUNTY 911.

&&

FM

Special weather statement, Apr 30, 10:54 PM CDT, 1 hour 3 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1054 PM CDT MON APR 30 2012

OKZ015>019-022>025-027-010445-
LOGAN OK-OKLAHOMA OK-CUSTER OK-BLAINE OK-KINGFISHER OK-DEWEY OK-
CADDO OK-WASHITA OK-GRADY OK-CANADIAN OK-
1054 PM CDT MON APR 30 2012

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL LOGAN...WEST
CENTRAL OKLAHOMA...CUSTER...BLAINE...KINGFISHER...DEWEY...NORTHERN
CADDO...NORTHEASTERN WASHITA...NORTHWESTERN GRADY AND CANADIAN
COUNTIES UNTIL 1145 PM CDT...

AT 1051 PM CDT...RADAR INDICATED SCATTERED SHOWERS DEVELOPING
AHEAD OF THUNDERSTORMS ACROSS SOUTHWEST OKLAHOMA.  WIND GUSTS NEAR
55 MPH MAY BE ASSOCIATED WITH SOME OF THE DEVELOPING SHOWERS ACROSS
CENTRAL AND WEST CENTRAL OKLAHOMA.

HAZARDS INCLUDE...
WIND GUSTS TO 55 MPH...

LOCATIONS IMPACTED INCLUDE...
EL RENO...WEATHERFORD...CLINTON...KINGFISHER...YUKON...CONCHO...
MUSTANG...WATONGA...PIEDMONT...HINTON...HENNESSEY...UNION CITY...
GEARY...OKEENE...THOMAS...OKARCHE...HYDRO...ARAPAHO...CASHION AND
CANTON.

LAT...LON 3614 9902 3617 9766 3535 9766 3533 9906
TIME...MOT...LOC 0351Z 302DEG 57KT 3564 9807

Local storm report, Apr 30, 11:15 PM CDT, 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1115 PM CDT MON APR 30 2012

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

1112 PM     FLASH FLOOD      BRAMAN                  36.92N 97.33W
04/30/2012                   KAY                OK   EMERGENCY MNGR

            WATER FIVE TO SEVEN INCHES DEEP ACROSS MAIN STREET AND
            RESIDENTIAL STREETS IN BRAMAN.

&&

FM

Special weather statement, Apr 30, 11:25 PM CDT, 32 minutes before

SPECIAL WEATHER STATEMENTNATIONAL WEATHER SERVICE NORMAN OK1125 PM
CDT MON APR 30 2012

OKZ020-025-026-029-030-010500-
LINCOLN OK-OKLAHOMA OK-PAYNE OK-CLEVELAND OK-POTTAWATOMIE OK-
1125 PM CDT MON APR 30 2012

...SIGNIFICANT WEATHER ADVISORY FOR LINCOLN...SOUTHEASTERN
OKLAHOMA...SOUTHEASTERN PAYNE...NORTH CENTRAL CLEVELAND AND
NORTHWESTERN POTTAWATOMIE COUNTIES UNTIL 1200 AM CDT...

AT 1122 PM CDT...STRONG THUNDERSTORMS WERE DEVELOPING FROM
RIPLEY TO 7 MILES SOUTH OF WELLSTON TO STANLEY DRAPER LAKE...
MOVING NORTHEAST AT 30 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 50 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

LOCATIONS IMPACTED INCLUDE...
STELLA...CUSHING...HARRAH...MCLOUD...CHANDLER...STROUD...MEEKER...
DAVENPORT...AGRA...WARWICK...KENDRICK...SPARKS...AVERY...DALE...
STANLEY DRAPER LAKE...PARKLAND AND AYDELOTTE.

LAT...LON 3561 9664 3531 9698 3530 9752 3557 9709
      3604 9684 3612 9663 3569 9662
TIME...MOT...LOC 0422Z 237DEG 57KT 3599 9685 3558 9706 3532 9741

Special weather statement, Apr 30, 11:30 PM CDT, 27 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1130 PM CDT MON APR 30 2012

OKZ023-027-028-038>040-044-010530-
COTTON OK-CADDO OK-GRADY OK-MCCLAIN OK-GARVIN OK-STEPHENS OK-
COMANCHE OK-
1130 PM CDT MON APR 30 2012

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN COTTON...
SOUTHEASTERN CADDO...GRADY...MCCLAIN...GARVIN...STEPHENS AND
COMANCHE COUNTIES UNTIL 1230 AM CDT...

AT 1128 PM CDT...STRONG THUNDERSTORMS WERE ALONG A LINE EXTENDING
FROM TABLER TO RUSH SPRINGS TO MEDICINE PARK...MOVING EAST AT 25
MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

LOCATIONS IMPACTED INCLUDE...
LAWTON...DUNCAN...CHICKASHA...MARLOW...LINDSAY...CACHE...COMANCHE...
MAYSVILLE...RUSH SPRINGS...ELGIN...CYRIL...BRAY...FLETCHER...
NINNEKAH...GERONIMO...STERLING...EMPIRE CITY...WAYNE...VELMA AND
ALEX.

LAT...LON 3466 9868 3519 9791 3500 9734 3496 9733
      3496 9729 3451 9747 3450 9751 3450 9756
      3448 9756 3427 9817
TIME...MOT...LOC 0428Z 290DEG 21KT 3509 9785 3472 9798 3465 9852

MAXWELL

Local storm report, Apr 30, 11:32 PM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1132 PM CDT MON APR 30 2012

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

1125 PM     TSTM WND GST     2 SSW MINCO             35.29N 97.96W
04/30/2012  M78 MPH          GRADY              OK   MESONET

&&

EM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 7:14 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	46 min
Apr 30, 7:26 PM CDT	Tornado Warning	OUN	Alfalfa	34 min
Apr 30, 7:32 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	58 min
Apr 30, 7:54 PM CDT	Special Weather Statement	OUN	Harmon	36 min
Apr 30, 7:58 PM CDT	Tornado Warning	OUN	Alfalfa, Grant	47 min
Apr 30, 8:09 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon	66 min
Apr 30, 8:17 PM CDT	Special Weather Statement	OUN	Greer, Washita	28 min
Apr 30, 8:23 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Kiowa, Washita	67 min
Apr 30, 8:27 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	63 min
Apr 30, 8:39 PM CDT	Tornado Warning	OUN	Grant	51 min
Apr 30, 9:08 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	52 min
Apr 30, 9:10 PM CDT	Tornado Warning	OUN	Kiowa, Washita	16 min
Apr 30, 9:13 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	62 min
Apr 30, 9:28 PM CDT	Tornado Warning	OUN	Grant, Kay	32 min
Apr 30, 9:32 PM CDT	Special Weather Statement	OUN	Kiowa	43 min
Apr 30, 9:39 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Greer, Jackson, Kiowa, Washita	51 min
Apr 30, 9:40 PM CDT	Tornado Warning	OUN	Grant	35 min
Apr 30, 9:57 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	48 min
Apr 30, 9:58 PM CDT	Tornado Warning	OUN	Grant, Kay	47 min
Apr 30, 10:04 PM CDT	Flash Flood Warning	OUN	Grant, Kay	4 hr
Apr 30, 10:05 PM CDT	Areal Flood Advisory	OUN	Greer, Harmon, Jackson	4 hr
Apr 30, 10:15 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson, Kiowa	60 min
Apr 30, 10:18 PM CDT	Tornado Warning	OUN	Kay	27 min
Apr 30, 10:20 PM CDT	Tornado Warning	OUN	Greer, Harmon, Jackson	14 min
Apr 30, 10:33 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Cotton, Grady, Kiowa, Stephens and 2 more	57 min
Apr 30, 10:36 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	54 min
Apr 30, 10:54 PM CDT	Special Weather Statement	OUN	Blaine, Canadian, Custer, Dewey, Kingfisher	51 min
Apr 30, 11:11 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Greer, Harmon, Jackson, Kiowa and 1 more	53 min
Apr 30, 11:25 PM CDT	Special Weather Statement	OUN	Lincoln	35 min
Apr 30, 11:28 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kay, Noble	51 min
Apr 30, 11:30 PM CDT	Special Weather Statement	OUN	Comanche, Grady, McClain, Stephens	60 min
Apr 30, 11:32 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	43 min
May 1, 12:12 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Pottawatomie, Seminole	34 min
May 1, 12:25 AM CDT	Special Weather Statement	OUN	Dewey	35 min
May 1, 12:30 AM CDT	Special Weather Statement	OUN	Garvin, McClain, Murray, Pontotoc	30 min
May 1, 12:51 AM CDT	Special Weather Statement	OUN	Pottawatomie, Seminole	39 min
May 1, 12:57 AM CDT	Special Weather Statement	OUN	Garvin, Murray, Pontotoc	33 min
May 1, 1:29 AM CDT	Special Weather Statement	OUN	Coal, Hughes, Johnston, Pontotoc, Seminole	46 min
May 1, 2:11 AM CDT	Special Weather Statement	OUN	Coal	49 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2012 Every severe thunderstorm warning in 2012

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.