Alert archive / Missouri / Tornado Watches in 1997

Tornado Watch 163

April 20, 199716 counties in Missouri

The Storm Prediction Center issued this tornado watch at Apr 20, 1997, 6:00 PM CDT for 16 counties in Missouri. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Apr 20, 1997, 6:00 PM CDT (23:00 UTC)
Expired
Apr 20, 1997, 10:00 PM CDT
In force
4 hr
Issued by
the Storm Prediction Center

Counties Benton County, MO, Camden County, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Hickory County, MO, Maries County, MO, Miller County, MO, Moniteau County, MO, Morgan County, MO, Osage County, MO, Pettis County, MO, Phelps County, MO, Pulaski County, MO, St. Clair County, MO

The radar

The Springfield radar (KSGF), 117 km from the middle of the area, began a volume at 23:04 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.

Warnings issued inside it

6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 20, 6:03 PM CDTTornado WarningSGFHickory47 min
Apr 20, 6:23 PM CDTTornado WarningSGFCamden47 min
Apr 20, 6:35 PM CDTSevere Thunderstorm WarningSGFBenton, St. Clair35 min
Apr 20, 6:48 PM CDTSevere Thunderstorm WarningSGFDallas, Hickory, Polk47 min
Apr 20, 6:58 PM CDTTornado WarningSGFPulaski47 min
Apr 20, 7:45 PM CDTTornado WarningSGFPhelps, Texas50 min

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 11.0 hours before the alert went out and 166 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 1997-04-20Temperature 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 1997-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 112 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2121 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
112 m²/s²
0-3 km storm-relative helicity
215 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 20, 3:45 PM CDTTornado WatchSPCBarry, Barton, Cedar, Christian, Dade, Dallas and 15 more6 hr

Nearby

Tornado Watches in Missouri, 1997Every tornado watch in 1997

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.