Alert archive / Missouri / Tornado Warnings in 1999

Tornado Warning 9, NWS Kansas City, MO

May 16, 1999Atchison County, Missouri

NWS Kansas City, MO issued this tornado warning at May 16, 1999, 9:32 PM CDT for Atchison County, Missouri. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: May 16, 1999, 9:32 PM CDT (02:32 UTC)
Expired: May 16, 1999, 10:15 PM CDT
In force: 43 min
Issued by: NWS Kansas City, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Atchison County, MO

The radar

The Omaha radar (KOAX), 120 km from the middle of the area, began a volume at 02:33 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 16, 9:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.5 hours before the alert went out and 120 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: 996 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 781 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 261 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 10.2

Open this sounding in Storm Lab

The text

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

999 
WFUS1 KMCI 170236 RRA
TORMCI
MOC005-170315-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
932 PM CDT SUN MAY 16 1999

THE NATIONAL WEATHER SERVICE IN PLEASANT HILL HAS ISSUED A

* TORNADO WARNING FOR...
  ATCHISON COUNTY IN MISSOURI

* UNTIL 1015 PM CDT

* AT 932 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED A
  DEVELOPING TORNADO 2 MILES SOUTHWEST OF WATSON...OR 4 MILES EAST OF
  PERU...MOVING EAST AT 40 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  ROCK PORT AT 940 PM CDT
  9 MILES NORTH OF FAIRFAX AT 950 PM CDT
  WESTBORO AT 955 PM CDT

OTHER LOCATIONS IN THE WARNING INCLUDE PHELPS CITY AND LANGDON.

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
NOT BE OCCURRING WHEN THE WARNING IS ISSUED...BUT ONE IS EXPECTED TO
DEVELOP. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE
INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM
WINDOWS. IF DRIVING...DO NOT DRIVE INTO THIS STORM

LAT...LON 4046 9585 4029 9556 4031 9525 4056 9520
          4057 9553

MJM

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 12:31 AM CDT	Severe Thunderstorm Warning	EAX	Chariton, Saline	44 min
May 17, 1:47 AM CDT	Severe Thunderstorm Warning	EAX	Cass, Jackson	43 min
May 17, 2:52 AM CDT	Severe Thunderstorm Warning	EAX	Johnson	38 min
May 17, 3:04 AM CDT	Severe Thunderstorm Warning	EAX	Lafayette	41 min
May 17, 3:21 AM CDT	Severe Thunderstorm Warning	EAX	Henry	24 min

Nearby

Tornado Warnings in Missouri, 1999 Every tornado warning in 1999 Tornadoes in 1999

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.