Alert archive / Missouri / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 52, NWS Springfield, MO

April 20, 2002Barton County, Vernon County, Missouri; Bourbon County, Crawford County, Kansas

NWS Springfield, MO issued this severe thunderstorm warning at Apr 20, 2002, 3:18 PM CDT for Barton County, Vernon County, Missouri; Bourbon County, Crawford County, Kansas. It was in force for 27 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 20, 2002, 3:18 PM CDT (20:18 UTC)
Expired: Apr 20, 2002, 3:45 PM CDT
In force: 27 min
Issued by: NWS Springfield, MO
Area: Counties, with a storm outline in the text

Counties Bourbon County, KS, Crawford County, KS, Barton County, MO, Vernon County, MO

The radar

The Pleasant Hill radar (KEAX), 113 km from the middle of the area, began a volume at 20:21 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.

What was reported inside it

Time	Report	Where	Remark
Apr 20, 3:25 PM CDT	Hail 0.75	Lamar, MO

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 8.3 hours before the alert went out and 123 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: 393 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 585 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: -1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS53 KSGF 202018
SVRSGF
KSC011-037-MOC011-217-202045-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPRINGFIELD MO
316 PM CDT SAT APR 20 2002

THE NATIONAL WEATHER SERVICE IN SPRINGFIELD HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN BARTON COUNTY IN SOUTHWEST MISSOURI
  VERNON COUNTY IN WEST CENTRAL MISSOURI
  NORTHEASTERN CRAWFORD COUNTY IN SOUTHEAST KANSAS
  EASTERN BOURBON COUNTY IN SOUTHEAST KANSAS

* UNTIL 345 PM CDT

* AT 314 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING BASEBALL SIZE HAIL OR
  LARGER...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED 6 MILES NORTHEAST OF LIBERAL...OR 16 MILES SOUTHWEST OF
  NEVADA...AND MOVING EAST AT 55 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
   SHELDON BY 325 PM CDT.
   WALKER BY 330 PM CDT.
   SCHELL CITY BY 340 PM CDT.

THE TOWNS OF HANNON...BRONAUGH...IRWIN...MILFORD AND MONTEVALLO ARE
ALSO IN THE PATH OF THIS STORM.

THIS IS AN EXTREMELY DANGEROUS STORM SEEK SHELTER IMMEDIATELY 
HAIL OF THIS SIZE COULD CAUSE EXTENSIVE DAMAGE.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

LAT...LON 3803 9496 3752 9480 3749 9408 3804 9406

BOOKBINDER

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 3:07 PM CDT	Severe Thunderstorm Warning	SGF	Barton, Vernon	38 min
Apr 20, 3:33 PM CDT	Severe Thunderstorm Warning	SGF	Cedar	27 min
Apr 20, 4:08 PM CDT	Severe Thunderstorm Warning	SGF	Polk	22 min
Apr 20, 4:29 PM CDT	Severe Thunderstorm Warning	SGF	Dallas, Webster	46 min
Apr 20, 5:00 PM CDT	Severe Thunderstorm Warning	SGF	Laclede, Wright	30 min
Apr 20, 6:22 PM CDT	Severe Thunderstorm Warning	SGF	Camden, Maries, Miller, Pulaski	23 min
Apr 20, 6:25 PM CDT	Flash Flood Warning	SGF	Camden, Maries, Miller, Phelps, Pulaski	6 hr
Apr 20, 2:55 PM CDT	Severe Thunderstorm Warning	SGF	Bourbon, Crawford	50 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2002 Severe Thunderstorm Warnings in Kansas, 2002 Every severe thunderstorm warning in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.