Alert archive / Missouri / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 32, NWS Kansas City, MO

April 20, 1999Ray County, Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Apr 20, 1999, 9:59 PM CDT for Ray County, Missouri. It was in force for 46 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Apr 20, 1999, 9:59 PM CDT (02:59 UTC)
Expired: Apr 20, 1999, 10:45 PM CDT
In force: 46 min
Issued by: NWS Kansas City, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Ray County, MO

The radar

The Pleasant Hill radar (KEAX), 65 km from the middle of the area, began a volume at 03:00 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, 10:05 PM CDT	Hail 0.88	Knoxville, 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 20, 9:15 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 3.0 hours before the alert went out and 148 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: 1527 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1855 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 299 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 16.0

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.

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 20, 2:33 PM CDT, 7 hours 26 minutes earlier.

Area forecast discussion, Apr 20, 2:33 PM CDT, 7 hours 26 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
233 PM CDT TUE APR 20 1999

STG LO-LVL WARM ADVECTION RESULTED IN SHRA DVLPMENT ACROSS ERN
NE/WRN IA THIS MORNING WITH -RA STILL CONITNUING IN FAR NE CWA.
CRNT PLACEMENT OF SFC FRONT STRETCHING FROM SOUTHERN KS INTO
SOUTHERN MO. 50+ DEGREE DPTS REACHING AS FAR NORTH AS STJ.

PREFERRED MOST ASPECTS OF THE AVN MODEL SOLUTION FOR THIS FCST
PACKAGE. FOR THE OVERNIGHT...LLVL JET BEGINS TO CRANK IN THE VERY
SOUTHERN PART OF CWA...MOSTLY AFTER 06Z. SFC LI/S AND CAPE IN THE
RANGE FOR CONVECTION...AND MOISTURE ON ITS WAY. MOST CONVECTION
SHUD OCCUR NEAR AND NORTH OF WARM FRONT. WILL KEEP CHC POPS FOR
TONITE. TEMPS TONITE SHUD BE A GOOD 10 DEGREES WARMER THAN LAST
NITE...FWC GUID ON TRACK.

PCP EVENT SHOULD BE ONGOING FOR WED/DAY AHEAD OF WARM FRONT...WITH
NORTHERN CWA REFLECTING HIGHER POPS THAN SOUTHERN. TEMPS TRICKY AND
DEPENDS HOW MUCH SUN BREAKS THROUGH. 925MB TEMPS AROUND 70...SO
WILL TREND ON THE HIER SIDE OF GUID FOR SOUTHERN CWA. AS DAYTIME
HEATING AFFECTS AREAS BEHIND THE FRONT...AGAIN INGREDIENTS ALL IN
PLACE FOR TSTORMS WED NITE...SEE SWODY2. WILL RAISE POPS INTO
LIKELY CATEGORIES FOR ALL FOR WED NITE. IF ETA PORTION OF QPF IS
CORRECT...WILL SEE ANOTHER HEAVY RAIN EVENT FOR CWA.

WARM FRONT DOES NOT MOVE A WHOLE LOT THROUGH THURS AND WILL
CONTINUE CHC POPS THROUGH THEN. TEMPS LOOK TO REMAIN NEAR GUID
TEMPS...WITH GRADUAL COOLING THRU EXTNDED. SHRT WVS CONTINUE TO
MOVE THROUGH TROUGH THROUGH THE EXTNDED. WITH A BREAK EXPECTED ON
SUNDAY.

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

LVQ

In the hours before

Local storm report, Apr 20, 9:44 PM CDT, 15 minutes before

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Local storm report, Apr 20, 9:44 PM CDT, 15 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 9:20 PM CDT	Severe Thunderstorm Warning	EAX	Ray	40 min
Apr 20, 9:47 PM CDT	Severe Thunderstorm Warning	EAX	Carroll	58 min
Apr 20, 9:53 PM CDT	Severe Thunderstorm Warning	EAX	Howard	52 min
Apr 20, 10:16 PM CDT	Severe Thunderstorm Warning	EAX	Lafayette	44 min
Apr 20, 10:45 PM CDT	Severe Thunderstorm Warning	EAX	Saline	60 min
Apr 20, 11:38 PM CDT	Flash Flood Warning	EAX	Saline	2 hr
Apr 20, 11:43 PM CDT	Severe Thunderstorm Warning	EAX	Saline	47 min
Apr 21, 12:02 AM CDT	Severe Thunderstorm Warning	EAX	Chariton	43 min
Apr 21, 12:46 AM CDT	Severe Thunderstorm Warning	EAX	Carroll, Chariton, Livingston	44 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.