Alert archive / Missouri / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 82, NWS St. Louis, MO

May 16, 1999Marion County, Missouri; Adams County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 16, 1999, 4:59 PM CDT for Marion County, Missouri; Adams County, Illinois. It was in force for 61 min. 4 reports 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: May 16, 1999, 4:59 PM CDT (21:59 UTC)
Expired: May 16, 1999, 6:00 PM CDT
In force: 61 min
Issued by: NWS St. Louis, MO
Area: Whole counties

Counties Adams County, IL, Marion County, MO

The radar

The St Louis radar (KLSX), 147 km from the middle of the area, began a volume at 22:00 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
May 16, 5:15 PM CDT	Hail 0.75	Palmyra, MO
May 16, 5:35 PM CDT	Hail 0.75	Quincy, IL
May 16, 5:45 PM CDT	Hail 1.75	Quincy, IL
May 16, 6:10 PM CDT	Hail 0.75	Camp Pt, IL

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

Davenport, (KDVN), launched 12:00Z, 10.0 hours before the alert went out and 206 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: 266 J/kg
Mixed-layer CIN: -240 J/kg
Mixed-layer LCL: 780 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

999 
WUUS1 KSTL 162201
SVRSTL
ILC001-MOC127-162300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
459 PM CDT SUN MAY 16 1999

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ADAMS COUNTY IN WEST CENTRAL ILLINOIS
  EASTERN MARION COUNTY MISSOURI IN NORTHEASTERN MISSOURI

* UNTIL 600 PM CDT

* AT 455 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES SOUTHWEST OF PALMYRA ... MOVING
  NORTHEAST AT 25 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  PALMYRA
  QUINCY
  BURTON
  MARBLEHEAD



THE PRIMARY SEVERE WEATHER THREAT IS DAMAGING HAIL. LARGE HAIL CAN
CAUSE EXTENSIVE PROPERTY DAMAGE AN SERIOUS INJURY TO PEOPLE CAUGHT
OUTDOORS. MOVE INSIDE A STURDY BUILDING IMMEDIATELY.



WDB

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.

In the hours before

Local storm report, May 16, 4:09 PM CDT, 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MISSOURI
409 PM CDT SUN MAY 16 1999

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

1142 AM    BELGRADE                  MO   .75 INCH HAIL
05/16/99   WASHINGTON                     3/4 INCH HAIL REPORTED 1/2
                                          MILE WEST OF BELGRADE BY
                                          BELGRADE FIRE DEPARTMENT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 16, 11:11 AM CDT	Severe Thunderstorm Warning	LSX	Crawford, Washington	64 min
May 16, 11:21 AM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	64 min
May 16, 12:08 PM CDT	Severe Thunderstorm Warning	LSX	Washington	52 min
May 16, 5:58 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	47 min

Nearby

Severe Thunderstorm Warnings in Missouri, 1999 Severe Thunderstorm Warnings in Illinois, 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.