Alert archive / Missouri / Mesoscale Discussions in 2017

Mesoscale Discussion 788

May 19, 2017Calhoun County, Illinois; 53 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 19, 2017, 6:04 PM CDT for Calhoun County, Illinois; 53 counties in Missouri. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
May 19, 2017, 6:04 PM CDT (23:04 UTC)
Expired
May 19, 2017, 7:30 PM CDT
In force
86 min
Issued by
the Storm Prediction Center
All 54 counties

Calhoun County, IL, Audrain County, MO, Barry County, MO, Benton County, MO, Boone County, MO, Callaway County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, Cole County, MO, Cooper County, MO, Crawford County, MO, Dade County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Greene County, MO, Henry County, MO, Hickory County, MO, Howard County, MO, Howell County, MO, Jasper County, MO, Laclede County, MO, Lawrence County, MO, Lincoln County, MO, Maries County, MO, McDonald County, MO, Miller County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Newton County, MO, Osage County, MO, Ozark County, MO, Pettis County, MO, Phelps County, MO, Pike County, MO, Polk County, MO, Pulaski County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Saline County, MO, St. Clair County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO

The radar

The St Louis radar (KLSX), 150 km from the middle of the area, began a volume at 23:06 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

Springfield, MO (KSGF), launched 12:00Z, 11.1 hours before the alert went out and 211 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, Springfield, MO at 12:00Z on 2017-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Springfield, MO at 12:00Z on 2017-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -97 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
968 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
-97 m²/s²
0-3 km storm-relative helicity
118 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
May 19, 4:07 AM CDTMesoscale DiscussionSPCBond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more113 min
May 19, 4:16 AM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more3 hr
May 19, 6:30 AM CDTMesoscale DiscussionSPCBond, Clay, Clinton, Crawford, Cumberland, Effingham and 9 more90 min
May 19, 3:06 PM CDTTornado WatchSPCCalhoun7 hr
May 18, 7:06 PM CDTMesoscale DiscussionSPCBuchanan, Caldwell, Cass, Clay, Clinton, Jackson and 4 more84 min
May 18, 9:41 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Cass, Cedar and 18 more94 min
May 18, 9:41 PM CDTSevere Thunderstorm WatchSPCAndrew, Bates, Buchanan, Caldwell, Cass, Clay and 9 more4 hr
May 18, 10:58 PM CDTTornado WatchSPCBarry, Christian, Douglas, Greene, Howell, Lawrence and 10 more6 hr
May 18, 11:48 PM CDTMesoscale DiscussionSPCBarry, Christian, McDonald, Newton, Stone, Taney57 min
May 19, 2:13 PM CDTMesoscale DiscussionSPCBarry, Christian, Dade, Douglas, Greene, Howell and 9 more92 min
May 19, 5:03 PM CDTMesoscale DiscussionSPCButler, Dunklin, Mississippi, New Madrid, Pemiscot, Stoddard117 min

Nearby

Mesoscale Discussions in Missouri, 2017Mesoscale Discussions in Illinois, 2017Every mesoscale discussion in 2017

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.