Alert archive / Oklahoma / Mesoscale Discussions in 2004

Mesoscale Discussion 450

April 23, 200435 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2004, 1:46 PM CDT for 35 counties in Oklahoma. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
Apr 23, 2004, 1:46 PM CDT (18:46 UTC)
Expired
Apr 23, 2004, 3:45 PM CDT
In force
119 min
Issued by
the Storm Prediction Center
All 35 counties

Adair County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Lincoln County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Norman radar (KTLX), 26 km from the middle of the area, began a volume at 18:47 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, 6.8 hours before the alert went out and 32 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 2004-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 810 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 2004-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 260 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
810 J/kg
Mixed-layer CIN
-125 J/kg
Mixed-layer LCL
450 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
260 m²/s²
0-3 km storm-relative helicity
262 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.8

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 22, 7:10 PM CDTMesoscale DiscussionSPCCherokee, Craig, Delaware, Hughes, LeFlore, McCurtain and 10 more35 min
Apr 22, 7:50 PM CDTTornado WatchSPCAdair, Cherokee, Delaware, Haskell, McIntosh, Muskogee and 2 more4 hr
Apr 22, 8:00 PM CDTMesoscale DiscussionSPCLove60 min
Apr 22, 9:50 PM CDTSevere Thunderstorm WatchSPCAdair, Cherokee, Delaware, Haskell, Latimer, LeFlore and 5 more6 hr
Apr 22, 11:47 PM CDTMesoscale DiscussionSPCBeaver, Custer, Dewey, Ellis, Harper, Major and 3 more58 min
Apr 23, 12:54 AM CDTMesoscale DiscussionSPCAdair, Cherokee, Delaware, Haskell, Latimer, LeFlore and 5 more96 min
Apr 23, 10:10 AM CDTMesoscale DiscussionSPCBeaver, Beckham, Blaine, Custer, Dewey, Ellis and 11 more3 hr
Apr 23, 10:37 AM CDTMesoscale DiscussionSPCOttawa113 min
Apr 23, 12:15 PM CDTTornado WatchSPCCarter, Cotton, Jefferson, Tillman6 hr
Apr 23, 2:10 PM CDTSevere Thunderstorm WatchSPCAdair, Blaine, Caddo, Canadian, Cherokee, Cleveland and 30 more6 hr
Apr 23, 3:05 PM CDTMesoscale DiscussionSPCCotton, Garvin, Murray, Pontotoc, Stephens85 min
Apr 23, 3:05 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Craig, Garfield, Grant, Kay, Major and 5 more5 hr
Apr 23, 4:40 PM CDTMesoscale DiscussionSPCCarter, Jefferson65 min
Apr 23, 5:30 PM CDTSevere Thunderstorm WatchSPCCarter, Cotton, Jefferson, Johnston, Love, Marshall and 3 more7 hr
Apr 23, 6:01 PM CDTMesoscale DiscussionSPCCreek, Haskell, Latimer, LeFlore, Lincoln, Nowata and 9 more59 min

Nearby

Mesoscale Discussions in Oklahoma, 2004Every mesoscale discussion in 2004

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.