Alert archive / Missouri / Special Weather Statements in 2019

Special Weather Statement, NWS St. Louis, MO

August 21, 2019Boone County, Missouri

NWS St. Louis, MO issued this special weather statement at Aug 21, 2019, 8:42 AM CDT for Boone County, Missouri. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 21, 2019, 8:42 AM CDT (13:42 UTC)
Expired: Aug 21, 2019, 9:30 AM CDT
In force: 48 min
Issued by: NWS St. Louis, MO

County Boone County, MO

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 1.7 hours before the alert went out and 281 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1626 J/kg
Mixed-layer CIN: -173 J/kg
Mixed-layer LCL: 1382 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 219 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before this special weather statement went out at Aug 21, 6:40 AM CDT, 2 hours 2 minutes earlier.

Area forecast discussion, Aug 21, 6:40 AM CDT, 2 hours 2 minutes before

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Hazardous weather outlook, Aug 21, 4:37 AM CDT, 4 hours 5 minutes before

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In the hours before

Special weather statement, Aug 21, 8:05 AM CDT, 37 minutes before

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Special weather statement, Aug 21, 8:42 AM CDT, 0 minutes before

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The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 21, 8:05 AM CDT	Special Weather Statement	LSX	Lewis	40 min
Aug 21, 9:44 AM CDT	River Flood Warning	LSX	Boone, Callaway, Cole, Moniteau	21 days
Aug 21, 3:06 PM CDT	Flash Flood Watch	LSX	Audrain, Boone, Callaway, Cole, Crawford, Franklin and 14 more	19 hr
Aug 21, 3:27 PM CDT	Special Weather Statement	LSX	Madison	48 min
Aug 21, 4:16 PM CDT	Special Weather Statement	LSX	Madison	44 min
Aug 21, 4:58 PM CDT	Special Weather Statement	LSX	Madison	62 min
Aug 21, 5:47 PM CDT	Special Weather Statement	LSX	Iron	43 min
Aug 21, 10:17 AM CDT	Special Weather Statement	LSX	Pike	43 min

Nearby

Special Weather Statements in Missouri, 2019 Every special weather statement in 2019

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.