Alert archive / Oklahoma / Mesoscale Discussions in 2005

Mesoscale Discussion 489

April 5, 20054 counties in Kansas; 16 counties in Oklahoma; 7 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2005, 1:58 PM CDT for 4 counties in Kansas; 16 counties in Oklahoma; 7 counties in Texas. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Apr 5, 2005, 1:58 PM CDT (18:58 UTC)
Expired
Apr 5, 2005, 3:30 PM CDT
In force
92 min
Issued by
the Storm Prediction Center
All 27 counties

Chautauqua County, KS, Cowley County, KS, Elk County, KS, Montgomery County, KS, Atoka County, OK, Bryan County, OK, Coal County, OK, Creek County, OK, Hughes County, OK, McIntosh County, OK, Nowata County, OK, Okfuskee County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Pittsburg County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Collin County, TX, Dallas County, TX, Ellis County, TX, Fannin County, TX, Hunt County, TX, Kaufman County, TX, Rockwall County, TX

The radar

The Norman radar (KTLX), 90 km from the middle of the area, began a volume at 19:01 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 12:00Z, 7.0 hours before the alert went out and 96 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 12:00Z on 2005-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 179 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 12:00Z on 2005-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 296 square meters per square second.19395878Sfc1 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
179 J/kg
Mixed-layer CIN
-475 J/kg
Mixed-layer LCL
867 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
296 m²/s²
0-3 km storm-relative helicity
224 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Apr 5, 11:02 AM CDTMesoscale DiscussionSPCBarton, Clay, Cloud, Decatur, Dickinson, Ellis and 33 more118 min
Apr 5, 2:05 PM CDTSevere Thunderstorm WatchSPCBarton, Butler, Cowley, Decatur, Edwards, Ellis and 29 more7 hr
Apr 5, 2:25 PM CDTMesoscale DiscussionSPCClark, Comanche2 hr
Apr 5, 2:30 PM CDTSevere Thunderstorm WatchSPCAllen, Bourbon, Chautauqua, Cherokee, Crawford, Elk and 6 more7 hr
Apr 5, 3:55 PM CDTMesoscale DiscussionSPCAllen, Anderson, Barton, Bourbon, Butler, Chase and 62 more95 min
Apr 5, 4:45 PM CDTSevere Thunderstorm WatchSPCAnderson, Chase, Clay, Cloud, Coffey, Dickinson and 16 more7 hr
Apr 5, 6:50 PM CDTMesoscale DiscussionSPCAllen, Anderson, Atchison, Bourbon, Brown, Chase and 49 more55 min
Apr 5, 2:30 PM CDTTornado WatchSPCAtoka, Bryan, Choctaw, Coal, Haskell, Hughes and 9 more7 hr
Apr 5, 5:14 PM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Cherokee, Choctaw, Delaware and 13 more2 hr
Apr 5, 2:54 PM CDTMesoscale DiscussionSPCBell, Blanco, Burnet, Coryell, Gillespie, Kendall and 6 more96 min

Nearby

Mesoscale Discussions in Oklahoma, 2005Mesoscale Discussions in Texas, 2005Mesoscale Discussions in Kansas, 2005Every mesoscale discussion in 2005

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.