Alert archive / Oklahoma / Mesoscale Discussions in 2018

Mesoscale Discussion 1547

October 9, 20186 counties in Kansas; 33 counties in Oklahoma; 6 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 9, 2018, 9:09 AM CDT for 6 counties in Kansas; 33 counties in Oklahoma; 6 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Oct 9, 2018, 9:09 AM CDT (14:09 UTC)
Expired
Oct 9, 2018, 11:15 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 45 counties

Chautauqua County, KS, Cherokee County, KS, Cowley County, KS, Elk County, KS, Labette County, KS, Montgomery County, KS, Adair County, OK, Atoka County, OK, Bryan County, OK, Cherokee County, OK, Choctaw County, OK, Coal County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Haskell County, OK, Hughes County, OK, Kay County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McCurtain County, OK, McIntosh County, OK, Muskogee County, OK, Noble County, OK, Nowata County, OK, Okfuskee County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Pittsburg County, OK, Pushmataha County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Delta County, TX, Fannin County, TX, Hopkins County, TX, Hunt County, TX, Lamar County, TX, Red River County, TX

The radar

The Tulsa radar (KINX), 58 km from the middle of the area, began a volume at 14:12 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, 2.2 hours before the alert went out and 143 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 2018-10-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 211 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 2018-10-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 268 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
211 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
555 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
268 m²/s²
0-3 km storm-relative helicity
282 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.2

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 9, 11:31 AM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Cherokee, Coffey, Crawford and 18 more89 min
Oct 9, 12:17 PM CDTTornado WatchSPCAllen, Bourbon, Cherokee, Crawford, Labette, Montgomery and 3 more8 hr
Oct 9, 1:46 PM CDTTornado WatchSPCAnderson, Atchison, Doniphan, Douglas, Franklin, Jefferson and 5 more7 hr
Oct 9, 3:06 PM CDTMesoscale DiscussionSPCDouglas, Franklin, Jefferson, Johnson, Leavenworth, Linn and 2 more84 min
Oct 9, 8:48 AM CDTTornado WatchSPCAdair, Atoka, Bryan, Cherokee, Choctaw, Coal and 31 more5 hr
Oct 8, 8:55 PM CDTMesoscale DiscussionSPCCrockett, Edwards, Irion, Pecos, Reagan, Schleicher and 3 more95 min
Oct 9, 12:45 AM CDTSevere Thunderstorm WatchSPCBrown, Callahan, Coke, Coleman, Concho, Crockett and 15 more6 hr
Oct 9, 3:40 AM CDTMesoscale DiscussionSPCBrown, Coleman, Concho, Edwards, Kimble, Kinney and 7 more35 min
Oct 9, 5:52 AM CDTMesoscale DiscussionSPCBosque, Coryell, Hamilton, Hood, Johnson, Lampasas and 3 more53 min
Oct 9, 10:19 AM CDTMesoscale DiscussionSPCAtascosa, Bastrop, Bell, Bexar, Blanco, Bosque and 29 more116 min

Nearby

Mesoscale Discussions in Oklahoma, 2018Mesoscale Discussions in Kansas, 2018Mesoscale Discussions in Texas, 2018Every mesoscale discussion in 2018

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.