Alert archive / Missouri / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 21, NWS Springfield, MO

April 17, 1991McDonald County, Missouri

NWS Springfield, MO issued this severe thunderstorm warning at Apr 17, 1991, 4:42 PM CDT for McDonald County, Missouri. It was in force for 33 min.

The area

The counties it named.

The facts

Issued
Apr 17, 1991, 4:42 PM CDT (21:42 UTC)
Expired
Apr 17, 1991, 5:15 PM CDT
In force
33 min
Issued by
NWS Springfield, MO
Area
Whole counties

County McDonald County, MO

The nearest sounding before it

Springfield, MO (KUMN), launched 12:00Z, 9.7 hours before the alert went out and 57 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-pSkew-T log-p diagram, Springfield, MO at 12:00Z on 1991-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1743 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 12:00Z on 1991-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 123 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1743 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
777 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
123 m²/s²
0-3 km storm-relative helicity
107 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.

000 
TTAA00 KSGF 172142 RRA
SVRSGF
MOC119-172215-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE SPRINGFIELD MO
442 PM CDT WED APR 17 1991

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 515 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY

   IN THE SOUTHWEST PART OF MISSOURI
      MCDONALD

AT 440 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM NEAR
STOTTS CITY...OR ABOUT 30 MILES SOUTHWEST OF SPRINGFIED.

LARGE HAIL IS POSSIBLE WITH THIS STORM...AS IT MOVES TO THE
NORTHEAST AT AROUND 10 MILES AN HOUR.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADWAYS QUICKLY...
AVOID DRIVING INTO AREAS WHERE WATER COVERS THE ROAD.

 SIMKULET

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

Special weather statement, Apr 17, 3:05 PM CDT, 1 hour 37 minutes before
MOZ015-016-019-020-021-172130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPRINGFIELD MO
305 PM CDT WED APR 17 1991

AT 305 PM...AN ISOLATED...VERY STRONG THUNDERSTORM HAS DEVELOPED ABOUT
45 MILES SOUTHWEST OF SPRINGFIELD OR NEAR SHELL KNOB.

THIS STORM WILL LIKELY MOVE NORTHEAST AT 15 TO 20 MPH...ACROSS TABLE ROCK
LAKE.  VERY HEAVY RAIN...SMALL HAIL...AND STRONG GUSTY SURFACE WINDS
CAN BE EXPECTED  WITH THE PASSAGE OF THIS STORM.

BOATERS ON TABLE ROCK LAKE SHOULD MOVE TO SAVE COVER ON SHORE UNTIL
AFTER THE PASSAGE OF THIS STORM.

JOHNSON
Special weather statement, Apr 17, 4:15 PM CDT, 27 minutes before
MOZ015-016-019-020-021-172230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPRINGFIELD MO
415 PM CDT WED APR 17 1991

AT 415 PM...RADAR INDICATED A VERY STRONG THUNDERSTORM ABOUT 50 MILES
SOUTHWEST OF SPRINGFIELD OR JUST TO SOUTH OF CASSVILLE.

THIS STORM WAS MOVING SLOWLY NORTHEAST.  VERY HEAVY RAIN...SMALL HAIL
AND STRONG GUSTY SURFACE WINDS CAN BE EXPECTED WITH THE PASSAGE OF
THIS STORM.

IF THREATENING WEATHER APPROACHES YOU...MOVE TO AN INTERIOR ROOM ON
THE LOWEST FLOOR OF YOU HOME OR BUSINESS.

JOHNSON

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 17, 5:59 PM CDTSevere Thunderstorm WarningSGFCedar, Vernon31 min

Nearby

Severe Thunderstorm Warnings in Missouri, 1991Every severe thunderstorm warning in 1991

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.