Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 123, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Apr 19, 2009, 12:39 AM CDT for 4 counties in Oklahoma. It was in force for 51 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
- Apr 19, 2009, 12:39 AM CDT (05:39 UTC)
- Expired
- Apr 19, 2009, 1:30 AM CDT
- In force
- 51 min
- Issued by
- NWS Tulsa, OK
- Area
- Storm-based polygon
Counties Haskell County, OK, LeFlore County, OK, Muskogee County, OK, Sequoyah County, OK
The radar
The Western Arkansas radar (KSRX), 57 km from the middle of the area, began a volume at 05:39 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
Springfield, MO (KSGF), launched 00:00Z, 5.7 hours before the alert went out and 207 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
- 25 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 1130 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 18, 11:39 PM CDT, 1 hour earlier.
Area forecast discussion, Apr 18, 11:39 PM CDT, 1 hour before
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HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
457 PM CDT SAT APR 18 2009
ARZ001-002-010-011-019-020-029-OKZ049-053>076-191000-
ADAIR OK-BENTON AR-CARROLL AR-CHEROKEE OK-CHOCTAW OK-CRAIG OK-
CRAWFORD AR-CREEK OK-DELAWARE OK-FRANKLIN AR-HASKELL OK-LATIMER OK-
LE FLORE OK-MADISON AR-MAYES OK-MCINTOSH OK-MUSKOGEE OK-NOWATA OK-
OKFUSKEE OK-OKMULGEE OK-OSAGE OK-OTTAWA OK-PAWNEE OK-PITTSBURG OK-
PUSHMATAHA OK-ROGERS OK-SEBASTIAN AR-SEQUOYAH OK-TULSA OK-WAGONER OK-
WASHINGTON OK-WASHINGTON AR-
457 PM CDT SAT APR 18 2009
...STRONG TO SEVERE THUNDERSTORMS TO CONTINUE THROUGH THE EVENING
HOURS...
THIS OUTLOOK IS FOR NORTHWEST AND WEST CENTRAL ARKANSAS AS WELL AS
MUCH OF EASTERN OKLAHOMA.
.DAY ONE...TODAY AND TONIGHT.
SEVERE THUNDERSTORM.
RISK...ELEVATED.
AREA...EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.
ONSET...ONGOING...AND CONTINUING THROUGH THE EVENING.
DISCUSSION...
THUNDERSTORMS HAVE DEVELOPED THIS AFTERNOON ACROSS EASTERN OKLAHOMA
AND NORTHWEST ARKANSAS...AHEAD OF A STRONG UPPER LEVEL LOW PRESSURE
SYSTEM. WITH COOLING TEMPERATURES ALOFT...SEVERE STORMS
CONTAINING LARGE HAIL WILL CONTINUE TO BE POSSIBLE THROUGH THE LATE
AFTERNOON AND EVENING HOURS.
IN ADDITION...THUNDERSTORMS HAVE DEVELOPED AND STRENGTHENED ALONG THE
DRYLINE IN PARTS OF WESTERN OKLAHOMA. THIS ACTIVITY WILL TRANSLATE
EASTWARD AS THE EVENING PROGRESSES...LEADING TO THE POSSIBILITY
OF ADDITIONAL SEVERE STORMS LATER THIS EVENING.
SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
SPOTTER ACTIVATION MAY BE NEEDED.
.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.
SUNDAY...THUNDERSTORM POTENTIAL.
MONDAY THROUGH FRIDAY...NO HAZARDS.
EXTENDED DISCUSSION...
THUNDERSTORM CHANCES WILL CONTINUE INTO SUNDAY AS THE CORE
OF THE UPPER LOW PASSES OVER THE REGION. A LACK OF BOTH
INSTABILITY AND WIND SHEAR WILL LIMIT THE SEVERE WEATHER POTENTIAL
ON SUNDAY. THE REMAINDER OF THE WORK WEEK WILL REMAIN DRY AND MILD
AS STRONG HIGH PRESSURE BUILDS ACROSS THE CENTRAL UNITED STATES.
WWW.SRH.NOAA.GOV/TULSA CONTAINS ADDITIONAL TABULAR AND GRAPHICAL
INFORMATION.In the hours before
Special weather statement, Apr 18, 10:25 PM CDT, 2 hours 14 minutes before
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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1208 AM CDT SUN APR 19 2009
ARZ001-002-010-011-190600-
BENTON AR-CARROLL AR-MADISON AR-WASHINGTON AR-
1208 AM CDT SUN APR 19 2009
...SIGNIFICANT WEATHER ALERT...
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 100 AM CDT
FOR THE FOLLOWING COUNTIES...
IN NORTHWEST ARKANSAS
NORTHERN WASHINGTON...NORTHWESTERN CARROLL...EASTERN BENTON AND
NORTHWESTERN MADISON
AT 1208 AM CDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A
LINE EXTENDING FROM 3 MILES WEST OF PEA RIDGE TO 3 MILES SOUTHEAST OF
SAVOY...MOVING EAST AT 40 MPH.
THESE STORMS WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS
TO 40 MPH.
LAT...LON 3614 9369 3602 9442 3650 9424 3650 9355
TIME...MOT...LOC 0508Z 254DEG 34KT 3646 9415 3607 9430Special weather statement, Apr 19, 12:36 AM CDT, 3 minutes before
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Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 7:05 PM CDT | Special Weather Statement | TSA | Pittsburg | 40 min |
| Apr 18, 7:16 PM CDT | Flash Flood Warning | TSA | Adair | 119 min |
| Apr 18, 7:44 PM CDT | Special Weather Statement | TSA | Pittsburg | 46 min |
| Apr 18, 7:47 PM CDT | Special Weather Statement | TSA | Creek, Osage, Pawnee | 73 min |
| Apr 18, 7:53 PM CDT | Special Weather Statement | TSA | Okmulgee | 52 min |
| Apr 18, 8:06 PM CDT | Severe Thunderstorm Warning | TSA | Muskogee, Okmulgee | 54 min |
| Apr 18, 8:28 PM CDT | Special Weather Statement | TSA | Pittsburg | 47 min |
| Apr 18, 8:35 PM CDT | Severe Thunderstorm Warning | TSA | Muskogee, Okmulgee, Wagoner | 55 min |
| Apr 18, 8:50 PM CDT | Areal Flood Warning | TSA | Cherokee | 4 hr |
| Apr 18, 8:55 PM CDT | Special Weather Statement | TSA | Choctaw | 50 min |
| Apr 18, 8:56 PM CDT | Special Weather Statement | TSA | Creek, Osage, Pawnee | 64 min |
| Apr 18, 8:57 PM CDT | Special Weather Statement | TSA | Pushmataha | 48 min |
| Apr 18, 9:12 PM CDT | Special Weather Statement | TSA | Latimer | 48 min |
| Apr 18, 9:16 PM CDT | Severe Thunderstorm Warning | TSA | Creek, Okfuskee, Okmulgee, Osage, Pawnee, Rogers and 1 more | 59 min |
| Apr 18, 9:25 PM CDT | Severe Thunderstorm Warning | TSA | Craig, Nowata, Osage, Pawnee, Rogers, Tulsa and 1 more | 65 min |
| Apr 18, 9:29 PM CDT | Severe Thunderstorm Warning | TSA | Cherokee, McIntosh, Mayes, Muskogee, Wagoner | 61 min |
| Apr 18, 9:32 PM CDT | Severe Thunderstorm Warning | TSA | Latimer | 43 min |
| Apr 18, 9:44 PM CDT | Special Weather Statement | TSA | Pushmataha | 46 min |
| Apr 18, 10:11 PM CDT | Special Weather Statement | TSA | LeFlore | 64 min |
| Apr 18, 10:13 PM CDT | Severe Thunderstorm Warning | TSA | Creek, Okmulgee, Tulsa, Wagoner | 47 min |
| Apr 18, 10:17 PM CDT | Special Weather Statement | TSA | McIntosh, Okmulgee | 43 min |
| Apr 18, 10:24 PM CDT | Special Weather Statement | TSA | Delaware | 66 min |
| Apr 18, 10:25 PM CDT | Special Weather Statement | TSA | Cherokee | 65 min |
| Apr 18, 10:29 PM CDT | Special Weather Statement | TSA | Craig, Delaware, Mayes, Nowata, Ottawa, Rogers | 61 min |
| Apr 18, 10:54 PM CDT | Special Weather Statement | TSA | McIntosh, Muskogee, Wagoner | 51 min |
| Apr 18, 11:37 PM CDT | Special Weather Statement | TSA | McIntosh, Muskogee, Pittsburg | 68 min |
| Apr 19, 12:36 AM CDT | Special Weather Statement | TSA | Haskell, Latimer, Pittsburg, Sequoyah | 39 min |
| Apr 19, 1:05 AM CDT | Special Weather Statement | TSA | Haskell, Pittsburg | 40 min |
| Apr 19, 1:21 AM CDT | Special Weather Statement | TSA | Sequoyah | 39 min |
| Apr 19, 2:06 AM CDT | Special Weather Statement | TSA | Latimer | 39 min |
| Apr 19, 2:43 AM CDT | Areal Flood Advisory | TSA | Latimer, LeFlore, Pittsburg | 2 hr |
| Apr 19, 3:31 PM CDT | River Flood Warning | TSA | Ottawa | 3 days |
| Apr 18, 10:10 PM CDT | Special Weather Statement | TSA | Crawford | 50 min |
| Apr 19, 12:08 AM CDT | Special Weather Statement | TSA | Benton | 52 min |
| Apr 19, 1:39 AM CDT | Special Weather Statement | TSA | Sebastian | 51 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2009Every 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.