Alert archive / Kansas / Mesoscale Discussions in 2018

Mesoscale Discussion 1081

July 19, 201813 counties in Kansas; Atchison County, Holt County, Missouri; 7 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2018, 3:52 AM CDT for 13 counties in Kansas; Atchison County, Holt County, Missouri; 7 counties in Nebraska. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
Jul 19, 2018, 3:52 AM CDT (08:52 UTC)
Expired
Jul 19, 2018, 4:45 AM CDT
In force
53 min
Issued by
the Storm Prediction Center
All 22 counties

Atchison County, KS, Brown County, KS, Doniphan County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Marshall County, KS, Nemaha County, KS, Pottawatomie County, KS, Riley County, KS, Shawnee County, KS, Wabaunsee County, KS, Washington County, KS, Atchison County, MO, Holt County, MO, Gage County, NE, Jefferson County, NE, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE

The radar

The Topeka radar (KTWX), 96 km from the middle of the area, began a volume at 08:55 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

Topeka, KS (KFOE), launched 00:00Z, 8.9 hours before the alert went out and 112 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, Topeka, KS at 00:00Z on 2018-07-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1667 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, Topeka, KS at 00:00Z on 2018-07-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.193958Sfc1 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
1667 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1186 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
168 m²/s²
Significant tornado parameter
0.9
Supercell composite
9.5

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
Jul 18, 9:21 PM CDTMesoscale DiscussionSPCClay, Cloud, Jewell, Lincoln, Marshall, Mitchell and 6 more114 min
Jul 19, 12:47 AM CDTMesoscale DiscussionSPCMarshall, Nemaha, Washington118 min
Jul 19, 1:00 AM CDTSevere Thunderstorm WatchSPCAtchison, Brown, Doniphan, Jackson, Marshall, Nemaha and 3 more5 hr
Jul 19, 11:37 AM CDTMesoscale DiscussionSPCAllen, Anderson, Atchison, Chase, Clay, Cloud and 38 more113 min
Jul 19, 12:26 PM CDTSevere Thunderstorm WatchSPCAllen, Anderson, Atchison, Barton, Bourbon, Chase and 43 more8 hr
Jul 19, 2:43 PM CDTMesoscale DiscussionSPCAtchison, Douglas, Franklin, Geary, Jackson, Jefferson and 10 more92 min
Jul 19, 5:42 PM CDTMesoscale DiscussionSPCBarber, Clark, Comanche, Edwards, Finney, Ford and 10 more3 hr
Jul 19, 9:58 AM CDTMesoscale DiscussionSPCAndrew, Bates, Benton, Boone, Caldwell, Callaway and 45 more2 hr
Jul 19, 11:22 AM CDTSevere Thunderstorm WatchSPCBarry, Barton, Bates, Benton, Caldwell, Callaway and 47 more10 hr
Jul 19, 2:15 PM CDTMesoscale DiscussionSPCBollinger, Butler, Carter, Christian, Dallas, Dent and 27 more2 hr
Jul 19, 2:32 PM CDTMesoscale DiscussionSPCMercer, Putnam, Schuyler118 min
Jul 19, 3:11 PM CDTTornado WatchSPCClark, Scotland6 hr
Jul 19, 5:18 PM CDTMesoscale DiscussionSPCClark, Schuyler, Scotland57 min
Jul 19, 6:26 PM CDTMesoscale DiscussionSPCClark, Knox, Lewis, Lincoln, Marion, Pike and 1 more64 min
Jul 19, 6:49 PM CDTSevere Thunderstorm WatchSPCKnox, Lewis, Lincoln, Marion, Pike, Ralls and 4 more7 hr

Nearby

Mesoscale Discussions in Kansas, 2018Mesoscale Discussions in Nebraska, 2018Mesoscale Discussions in Missouri, 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.