Alert archive / Missouri / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 7, NWS Kansas City, MO

April 2, 1999Clinton County, Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Apr 2, 1999, 8:05 PM CST for Clinton County, Missouri. It was in force for 55 min. 3 reports came from 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, with what was reported inside it.

The facts

Issued: Apr 2, 1999, 8:05 PM CST (02:05 UTC)
Expired: Apr 2, 1999, 9:00 PM CST
In force: 55 min
Issued by: NWS Kansas City, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Clinton County, MO

The radar

The Pleasant Hill radar (KEAX), 86 km from the middle of the area, began a volume at 02:05 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
Apr 2, 8:13 PM CST	Hail 0.75	Gower, MO
Apr 2, 8:20 PM CST	Hail 0.75	Grayson, MO
Apr 2, 8:55 PM CST	Hail 0.88	Perrin, 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 watch it was issued in

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

Issued	Product	Office	Lasted
Apr 2, 3:45 PM CST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 2.1 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: 823 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 1392 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

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

999 
WUUS1 KMCI 030207 RRA
SVRMCI
MOC049-030300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE KANSAS CITY-PLEASANT HILL MO
805 PM CST FRI APR 2 1999

THE NATIONAL WEATHER SERVICE IN PLEASANT HILL HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLINTON COUNTY IN MISSOURI

* UNTIL 900 PM CST

* AT 805 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED...
  A SEVERE THUNDERSTORM 5 MILES SOUTHWEST OF TRIMBLE...OR ABOUT 4    
  MILES NORTHWEST OF SMITHVILLE...MOVING NORTH NORTHEAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GOWER...OR 5 MILES WEST OF PLATTSBURG AT 820 PM CST

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CST FRIDAY 
EVENING FOR KANSAS. AND MISSOURI.

THIS SEVERE THUNDERSTORM WILL LIKELY PRODUCE GOLFBALL SIZE HAIL. FOR 
YOUR SAFETY...MOVE INDOORS AND STAY AWAY FROM WINDOWS. 
REMEMBER...LIGHTNING IS A THREAT FROM ALL THUNDERSTORMS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CST FRIDAY
EVENING FOR KANSAS. AND MISSOURI.

LAT...LON 3946 9462 3946 9422 3974 9421 3974 9461

What forecasters said that day

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

NWS Kansas City, MO wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 2, 2:47 PM CST, 5 hours 18 minutes earlier.

Area forecast discussion, Apr 2, 2:47 PM CST, 5 hours 18 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
247 PM CST FRI APR 2 1999

MAIN FORECAST CONCERN CENTERS AROUND SHORT WAVE COMING OUT OF SOUTHWEST TONIGHT AND SATURDAY. FRONT HAS BEEN HUNG UP IN NORTHWEST MISSOURI TODAY AND SHOULD STAY IN THAT AREA...OR MAY EVEN BACK UP SOME TONIGHT. PREFER ETA POSITIONING OF SURFACE FEATURES. NGM SHOWING ITS TOO FAR WEST BIAS. DRY AIR IS EXPECTED TO QUICKLY SWEEP INTO WESTERN MISSOURI BY SATURDAY EVENING. AS UPPER SHORT WAVE MOVES INTO AREA. LOW LEVEL JET TONIGHT AND ON DAY SATURDAY SHOULD SUPPORT THUNDERSTORM DEVELOPMENT. CAPPING THIS AFTERNOON SLOWING DEVELOPMENT...BUT ALREADY SEEING THAT BREAKING DOWN IN CENTRAL OKLAHOMA...AND WITH LOW LEVEL JET...SHOULD SEE STORMS INTO FORECAST AREA TONIGHT.

TEMPERATURES WILL BE TRICKY GIVEN FRONT AND CLOUD COVER. WITH FRONT EXPECTED TO BE GRADUALLY MOVING BACK TO THE NORTHWEST IN NORTHWEST MISSOURI...WILL NOT HAVE TEMPERATURES DROP MUCH FROM CURRENT LEVELS FOR LOWS TONIGHT. IN FACT THEY MAY CLIMB SOME IF FRONT BACKS UP. WITH ALL OF FORECAST AREA EXPECTED TO BE IN THE WARM SECTOR DURING DAY ON SATURDAY...WILL GO FAIRLY MILD...BUT BANK ON CLOUDINESS AND PRECIP TO STOP ANY BIG CLIMBS.  FAN SEEMS WAY TOO COLD...AND WILL EVEN GO SLIGHTLY ABOVE FWC NUMBERS.

.EAX...
MO...NONE.
KS...NONE.

PC

In the hours before

Local storm report, Apr 2, 7:41 PM CST, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
741 PM CST FRI APR 02 1999

TIME(CST)  .....CITY LOCATION..... STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0734 PM    PLATTE CITY               MO    1.75 INCH HAIL
04/02/99   PLATTE

Local storm report, Apr 2, 8:05 PM CST, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
805 PM CST FRI APR 02 1999

TIME(CST)  .....CITY LOCATION..... STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0750 PM    FAUCETT                   MO    .75 INCH HAIL
04/02/99   BUCHANAN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 2, 7:07 PM CST	Severe Thunderstorm Warning	EAX	Buchanan, Platte	63 min
Apr 2, 8:56 PM CST	Severe Thunderstorm Warning	EAX	DeKalb	54 min
Apr 3, 6:00 AM CST	Severe Thunderstorm Warning	EAX	Cass, Jackson	45 min

Nearby

Severe Thunderstorm Warnings in Missouri, 1999 Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.