Alert archive / Oklahoma / Mesoscale Discussions in 2009

Mesoscale Discussion 89

February 10, 2009Crawford County, Washington County, Arkansas; 42 counties in Oklahoma; 8 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 10, 2009, 6:13 PM CST for Crawford County, Washington County, Arkansas; 42 counties in Oklahoma; 8 counties in Texas. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Feb 10, 2009, 6:13 PM CST (00:13 UTC)
Expired
Feb 10, 2009, 7:45 PM CST
In force
92 min
Issued by
the Storm Prediction Center
All 52 counties

Crawford County, AR, Washington County, AR, Adair County, OK, Atoka County, OK, Bryan County, OK, Carter County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garvin County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Lincoln County, OK, Love County, OK, Marshall County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Clay County, TX, Cooke County, TX, Jack County, TX, Montague County, TX, Palo Pinto County, TX, Stephens County, TX, Wise County, TX, Young County, TX

The radar

The Norman radar (KTLX), 97 km from the middle of the area, began a volume at 00:16 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.2 hours before the alert went out and 94 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 00:00Z on 2009-02-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1279 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 00:00Z on 2009-02-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 218 square meters per square second.1939587897Sfc1 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
1279 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
1053 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
218 m²/s²
0-3 km storm-relative helicity
215 m²/s²
Significant tornado parameter
1.7
Supercell composite
7.2

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 10, 8:34 PM CSTMesoscale DiscussionSPCConway, Crawford, Faulkner, Franklin, Garland, Hempstead and 19 more86 min
Feb 10, 9:30 PM CSTTornado WatchSPCBaxter, Benton, Boone, Carroll, Clark, Cleburne and 42 more7 hr
Feb 10, 11:13 PM CSTMesoscale DiscussionSPCBaxter, Boone, Cleburne, Conway, Faulkner, Fulton and 18 more92 min
Feb 10, 11:45 PM CSTTornado WatchSPCArkansas, Clay, Craighead, Crittenden, Cross, Greene and 12 more6 hr
Feb 11, 12:37 AM CSTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Chicot, Cleveland, Desha and 3 more53 min
Feb 11, 1:04 AM CSTTornado WatchSPCAshley, Bradley, Calhoun, Chicot, Cleveland, Desha and 3 more5 hr
Feb 11, 2:30 AM CSTMesoscale DiscussionSPCArkansas, Clay, Craighead, Crittenden, Cross, Fulton and 18 more90 min
Feb 11, 4:01 AM CSTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Chicot, Cleveland, Columbia and 6 more89 min
Feb 11, 5:26 AM CSTMesoscale DiscussionSPCMississippi64 min
Feb 10, 7:18 PM CSTMesoscale DiscussionSPCCarter, Cleveland, Garvin, Jefferson, Lincoln, McClain and 1 more57 min
Feb 10, 9:46 PM CSTMesoscale DiscussionSPCAustin, Brazoria, Calhoun, Chambers, Colorado, DeWitt and 13 more29 min
Feb 10, 9:57 PM CSTSevere Thunderstorm WatchSPCAransas, Austin, Bastrop, Bee, Brazoria, Caldwell and 25 more5 hr

Nearby

Mesoscale Discussions in Oklahoma, 2009Mesoscale Discussions in Texas, 2009Mesoscale Discussions in Arkansas, 2009Every mesoscale discussion 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.