Alert archive / Oklahoma / Tornado Warnings in 2012
Tornado Warning 9, NWS Norman, OK
NWS Norman, OK issued this tornado warning at Apr 13, 2012, 3:59 PM CDT for Cleveland County, Oklahoma. It was in force for 31 min. 2 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 13, 2012, 3:59 PM CDT (20:59 UTC)
- Expired
- Apr 13, 2012, 4:30 PM CDT
- In force
- 31 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
County Cleveland County, OK
The radar
The Norman radar (KTLX), 16 km from the middle of the area, began a volume at 21:00 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 13, 4:01 PM CDT | TORNADO 1 | Norman, OK | *** 20 INJ *** THIS TORNADO BEGAN WEST OF THE SOUTH CANADIAN RIVER... OR ABOUT 3.7 MILES SW OF NORMAN. THE TORNADO ENTERED THE SOUTHWEST SIDE OF NORMAN AT 1601 AND CROSSED I-35 A SHORT TIME LATER. EF-1 DAMAGE OCCURRED IN TWO PLACES... ONE WAS ON EITHER SIDE OF |
| Apr 13, 4:02 PM CDT | TORNADO | Norman, OK | MULTIPLE SIGHTNINGS OF A TORNADO IN NORMAN. MULTIPLE REPORTS OF DAMAGE AND POSSIBLE INJURIES. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 13, 1:28 PM CDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 12:00Z, 9.0 hours before the alert went out and 1 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.
- Mixed-layer CAPE
- 1194 J/kg
- Mixed-layer CIN
- -77 J/kg
- Mixed-layer LCL
- 554 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 477 m²/s²
- 0-3 km storm-relative helicity
- 512 m²/s²
- Significant tornado parameter
- 2.0
- Supercell composite
- 23.9
The text
As transmitted, in the capitals the NWS used until 2016.
579
WFUS54 KOUN 132059
TOROUN
OKC027-132130-
/O.NEW.KOUN.TO.W.0009.120413T2059Z-120413T2130Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
359 PM CDT FRI APR 13 2012
THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A
* TORNADO WARNING FOR...
CLEVELAND COUNTY IN SOUTH CENTRAL OKLAHOMA...
* UNTIL 430 PM CDT
* AT 355 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS
DANGEROUS STORM WAS LOCATED NEAR NEWCASTLE...MOVING EAST AT 25
MPH.
* LOCATIONS IMPACTED INCLUDE...
NORMAN...STELLA AND LAKE THUNDERBIRD.
THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 108 AND 115.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
GET IN...GET DOWN AND COVER UP. TAKE COVER NOW IN A STORM SHELTER
OR AN INTERIOR ROOM OF A STURDY BUILDING. STAY AWAY FROM DOORS AND
WINDOWS.
&&
LAT...LON 3518 9749 3523 9755 3530 9756 3534 9716
3514 9715
TIME...MOT...LOC 2055Z 263DEG 22KT 3521 9754
$$
303 follow-up statements
107
WWUS54 KOUN 132104
SVSOUN
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
404 PM CDT FRI APR 13 2012
OKC027-132130-
/O.CON.KOUN.TO.W.0009.000000T0000Z-120413T2130Z/
CLEVELAND OK-
404 PM CDT FRI APR 13 2012
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM CDT FOR
CLEVELAND COUNTY...
AT 400 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A TORNADO.
THIS TORNADO WAS LOCATED NEAR NORMAN...MOVING EAST AT 25 MPH.
LOCATIONS IMPACTED INCLUDE...
NORMAN...STELLA AND LAKE THUNDERBIRD.
THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 107 AND 115.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
GET IN...GET DOWN AND COVER UP. TAKE COVER NOW IN A STORM SHELTER
OR AN INTERIOR ROOM OF A STURDY BUILDING. STAY AWAY FROM DOORS AND
WINDOWS.
&&
LAT...LON 3518 9749 3523 9755 3530 9756 3534 9716
3514 9715
TIME...MOT...LOC 2100Z 264DEG 22KT 3521 9751
$$
30464
WWUS54 KOUN 132111
SVSOUN
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
411 PM CDT FRI APR 13 2012
OKC027-132130-
/O.CON.KOUN.TO.W.0009.000000T0000Z-120413T2130Z/
CLEVELAND OK-
411 PM CDT FRI APR 13 2012
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM CDT FOR
CLEVELAND COUNTY...
AT 409 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED NEAR NORMAN...MOVING EAST AT 25 MPH.
LOCATIONS IMPACTED INCLUDE...
NORMAN...STELLA AND LAKE THUNDERBIRD.
THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 107 AND 115.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
GET IN...GET DOWN AND COVER UP. TAKE COVER NOW IN A STORM SHELTER
OR AN INTERIOR ROOM OF A STURDY BUILDING. STAY AWAY FROM DOORS AND
WINDOWS.
&&
LAT...LON 3518 9749 3523 9755 3530 9756 3534 9716
3514 9715
TIME...MOT...LOC 2109Z 260DEG 22KT 3522 9744
$$
30637
WWUS54 KOUN 132127
SVSOUN
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
427 PM CDT FRI APR 13 2012
OKC027-132140-
/O.EXP.KOUN.TO.W.0009.000000T0000Z-120413T2130Z/
CLEVELAND OK-
427 PM CDT FRI APR 13 2012
...THE TORNADO WARNING FOR CLEVELAND COUNTY WILL EXPIRE AT 430 PM
CDT...
THE STORM WHICH PROMPTED THE WARNING HAD WEAKENED...AND WAS NO
LONGER CAPABLE OF PRODUCING A TORNADO. THEREFORE THE TORNADO
WARNING WILL BE ALLOWED TO EXPIRE. HOWEVER HAIL TO THE SIZE OF
BASEBALLS AND WIND GUSTS TO 65 MPH WILL CONTINUE ACROSS
NORTHEAST CLEVELAND COUNTY. A SEVERE THUNDERSTORM WARNING DOES
CONTINUE UNTIL 5 PM.
LAT...LON 3518 9749 3523 9755 3530 9756 3534 9716
3514 9715
TIME...MOT...LOC 2126Z 263DEG 22KT 3522 9744
$$
30The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 13, 1:27 PM CDT | Special Weather Statement | OUN | Caddo | 33 min |
| Apr 13, 1:49 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Canadian, Grady | 41 min |
| Apr 13, 1:59 PM CDT | Special Weather Statement | OUN | Kiowa | 31 min |
| Apr 13, 2:06 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Greer, Jackson, Kiowa, Washita | 54 min |
| Apr 13, 2:14 PM CDT | Special Weather Statement | OUN | Comanche | 31 min |
| Apr 13, 2:17 PM CDT | Special Weather Statement | OUN | Jackson | 28 min |
| Apr 13, 2:20 PM CDT | Severe Thunderstorm Warning | OUN | Jackson, Kiowa, Tillman | 25 min |
| Apr 13, 2:25 PM CDT | Severe Thunderstorm Warning | OUN | Comanche | 50 min |
| Apr 13, 2:28 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Canadian, Grady | 47 min |
| Apr 13, 2:31 PM CDT | Severe Thunderstorm Warning | OUN | Jackson | 59 min |
| Apr 13, 2:58 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche, Kiowa, Washita | 62 min |
| Apr 13, 3:14 PM CDT | Severe Thunderstorm Warning | OUN | Canadian, Cleveland, Grady, McClain, Oklahoma | 46 min |
| Apr 13, 3:26 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Canadian | 49 min |
| Apr 13, 3:28 PM CDT | Severe Thunderstorm Warning | OUN | Jackson, Tillman | 19 min |
| Apr 13, 3:45 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche, Kiowa | 60 min |
| Apr 13, 3:53 PM CDT | Special Weather Statement | OUN | Kay | 52 min |
| Apr 13, 3:55 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, McClain, Oklahoma | 65 min |
| Apr 13, 4:03 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Kiowa, Washita | 42 min |
| Apr 13, 4:05 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Harmon, Jackson | 40 min |
| Apr 13, 4:28 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Grady | 62 min |
| Apr 13, 4:40 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Jackson, Kiowa | 65 min |
| Apr 13, 4:47 PM CDT | Special Weather Statement | OUN | Logan, Payne | 28 min |
| Apr 13, 4:48 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Harmon, Jackson | 57 min |
| Apr 13, 4:51 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, Lincoln, Oklahoma, Pottawatomie | 54 min |
| Apr 13, 5:05 PM CDT | Tornado Warning | OUN | Pottawatomie | 25 min |
| Apr 13, 5:09 PM CDT | Severe Thunderstorm Warning | OUN | Noble, Payne | 45 min |
| Apr 13, 5:22 PM CDT | Severe Thunderstorm Warning | OUN | Canadian, Cleveland, Grady, McClain, Oklahoma | 38 min |
| Apr 13, 5:29 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Jackson, Kiowa, Washita | 61 min |
| Apr 13, 5:43 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Harmon, Jackson, Kiowa | 62 min |
| Apr 13, 5:55 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 50 min |
| Apr 13, 5:56 PM CDT | Special Weather Statement | OUN | Grant | 34 min |
| Apr 13, 6:12 PM CDT | Tornado Warning | OUN | Jackson, Kiowa | 33 min |
| Apr 13, 6:13 PM CDT | Special Weather Statement | OUN | Blaine | 32 min |
| Apr 13, 6:16 PM CDT | Special Weather Statement | OUN | Oklahoma | 29 min |
| Apr 13, 6:27 PM CDT | Severe Thunderstorm Warning | OUN | Grant, Kay | 18 min |
| Apr 13, 6:38 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Greer, Harmon | 52 min |
| Apr 13, 6:39 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 36 min |
| Apr 13, 6:46 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Greer, Jackson, Kiowa, Washita | 59 min |
| Apr 13, 6:47 PM CDT | Special Weather Statement | OUN | Grant | 13 min |
Nearby
Tornado Warnings in Oklahoma, 2012Every tornado warning in 2012Tornadoes 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.