Alert archive / Missouri / Mesoscale Discussions in 2021

Mesoscale Discussion 215

March 17, 20217 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Mar 17, 2021, 7:45 PM CDT for 7 counties in Missouri. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
Mar 17, 2021, 7:45 PM CDT (00:45 UTC)
Expired
Mar 17, 2021, 8:45 PM CDT
In force
60 min
Issued by
the Storm Prediction Center
Concerning
Tornado watch 34

Counties Christian County, MO, Douglas County, MO, Greene County, MO, Ozark County, MO, Taney County, MO, Webster County, MO, Wright County, MO

The radar

The Springfield radar (KSGF), 80 km from the middle of the area, began a volume at 00:47 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 nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 0.8 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, Springfield, MO at 00:00Z on 2021-03-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 283 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, Springfield, MO at 00:00Z on 2021-03-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 305 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
283 J/kg
Mixed-layer CIN
-69 J/kg
Mixed-layer LCL
461 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
305 m²/s²
0-3 km storm-relative helicity
351 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.3

Open this sounding in Storm Lab

The text

As transmitted.

642 
ACUS11 KWNS 180046
SWOMCD
SPC MCD 180045 
MOZ000-ARZ000-180145-

Mesoscale Discussion 0215
NWS Storm Prediction Center Norman OK
0745 PM CDT Wed Mar 17 2021

Areas affected...Southwestern Missouri

Concerning...Tornado Watch 34...

Valid 180045Z - 180145Z

The severe weather threat for Tornado Watch 34 continues.

SUMMARY...The severe threat across WW34 will continue but gradually
decline through this evening. Trends will be monitored but a
downstream watch appears necessary.

DISCUSSION...A cluster of severe thunderstorms with a history of
producing large hail and a tornado will continue east over the next
1 to 2 hours. A general downtrend in convective intensity has been
noted over the last hour consistent with the loss of diurnal heating
and a shifting of large scale ascent away from the ongoing
convection. WW34 has been locally extended until 0200 UTC to account
for the remaining threat. Downstream of the storm cluster, buoyancy
weakens with temperatures in the low 60s F suggesting minimal threat
exists farther east. A downstream watch appears unlikely at this
time but, severe weather, including strong wind gusts and a tornado
or two, will remain possible for the next couple of hours.

..Lyons.. 03/18/2021

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...LZK...SGF...

LAT...LON   36539323 37279342 37589283 37659240 37549203 37089195
            36789202 36579213 36499220 36539323

Nearby

Mesoscale Discussions in Missouri, 2021Every mesoscale discussion in 2021

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.