Alert archive / Missouri / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 35, NWS Springfield, MO

April 18, 2002Greene County, Missouri

NWS Springfield, MO issued this severe thunderstorm warning at Apr 18, 2002, 12:50 PM CDT for Greene County, Missouri. It was in force for 40 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 18, 2002, 12:50 PM CDT (17:50 UTC)
Expired: Apr 18, 2002, 1:30 PM CDT
In force: 40 min
Issued by: NWS Springfield, MO
Area: Counties, with a storm outline in the text

County Greene County, MO

What was reported inside it

Time	Report	Where	Remark
Apr 18, 12:54 PM CDT	Hail 0.88	Ash Grove, 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 5.8 hours before the alert went out and 50 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: 1333 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 736 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 182 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KSGF 181750
SVRSGF
MOC077-181830-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPRINGFIELD MO
1248 PM CDT THU APR 18 2002

THE NATIONAL WEATHER SERVICE IN SPRINGFIELD HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN GREENE COUNTY IN MISSOURI

* UNTIL 130 PM CDT

* AT 1246 PM CDT...A TRAINED SPOTTER AND NATIONAL WEATHER SERVICE
  DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING 
  HAIL UP TO 1 INCH IN DIAMETER.  THIS STORM WAS LOCATED 4 MILES 
  SOUTH OF ASH GROVE...OR 16 MILES NORTHEAST OF MOUNT VERNON...AND 
  MOVING NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
   ASH GROVE BY 1255 PM CDT.
   WILLARD...WALNUT GROVE BY 110 PM CDT.

AT 1249 PM...A TRAINED WEATHER SPOTTER REPORTED NICKEL SIZE HAIL 
ABOUT 4 MILES SOUTH OF ASH GROVE.

THE TOWNS OF BOIS DARC...CAVE SPRINGS...GLIDEWELL...SACVILLE AND
EBENEZER ARE ALSO IN THE PATH OF THIS STORM.

LAT...LON 3717 9361 3719 9339 3741 9317 3744 9363

BOOKBINDER

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 Springfield, MO wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 18, 10:50 AM CDT, 2 hours earlier.

Area forecast discussion, Apr 18, 10:50 AM CDT, 2 hours before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPRINGFIELD MO
1050 AM CDT THU APR 18 2002

INTERESTING SHORT TERM FORECAST...WITH WIDELY SCATTERED ELEVATED
SHOWERS AND THUNDERSTORMS DEVELOPING IN SOUTHWEST MISSOURI/NORTHWEST
ARKANSAS/NORTHEAST OKLAHOMA IN SEEMINGLY CAPPED ATMOSPHERE.  UPPER
AIR ANALYSIS SHOWED 110 KNOT JET AT 250 MB OVER OKLAHOMA AND TEXAS
...WHICH WOULD PUT THE STORMS ON THE NOSE OF THIS JET. ACTIVITY MAY
BE FORMING IN THE LEADING EDGE OF HIGHER 850 MB DEWPOINTS...AS OUN
HAD 16 C WHILE SPRINGFIELD HAD 4 C AT 12Z. WILL ADD A 20 PERCENT
CHANCE OF SHOWERS/THUNDERSTORMS OVER SOUTHERN SECTIONS TO ACCOUNT
FOR THIS.

EXTENSIVE AREA OF MIDDLE AND HIGH CLOUDS OVER WESTERN SECTIONS OF
THE FORECAST AREA...WHICH WILL LIMIT HEATING AND THE MIXING
HEIGHT...MAKING A WIND ADVISORY UNLIKELY TODAY. WILL HAVE TO BEEF UP
CLOUD WORDING AREA WIDE...AND MAKE MAJOR CHANGES TO TEMPERATURES FOR
THIS AFTERNOON (FORECAST FOR WESTERN SECTIONS LOOKS TOO WARM...WHILE
SOUTH CENTRAL MISSOURI FORECAST HIGHS ARE TOO COOL.)

WE WILL HAVE AN 18Z UPPER AIR RELEASE TO ALLOW US TO BETTER ASSESS
THE STRENGTH OF THE CAPPING INVERSION.

.SGF...
MO...NONE.
KS...NONE.

SUTTON

In the hours before

Special weather statement, Apr 18, 11:35 AM CDT, 1 hour 15 minutes before

KSZ073-097-101-MOZ055>058-066>071-077>083-088>098-101>106-182300-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SPRINGFIELD MO
1135 AM CDT THU APR 18 2002

SCATTERED SHOWERS AND THUNDERSTORMS...THAT DEVELOPED THIS MORNING
FROM CENTRAL TO SOUTHWEST MISSOURI...WILL CONTINUE TO SPREAD EAST
THIS AFTERNOON...HOWEVER SEVERE THUNDERSTORM DEVELOPMENT IS NOT
LIKELY. ISOLATED STORMS MAY PRODUCE HAIL AROUND ONE HALF INCH IN
DIAMETER...GUSTY WINDS AND BRIEF HEAVY RAINFALL.

* EXTENDED OUTLOOK...

STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED FRIDAY THROUGH
SATURDAY...WITH DAMAGING WINDS AND LARGE HAIL THE MAIN THREATS.
HEAVY RAINFALL WILL ALSO BE POSSIBLE. THE THREAT FOR SEVERE WEATHER
WILL GRADUALLY SHIFT SOUTH AS WAVES OF SHOWERS AND THUNDERSTORMS
MOVE THROUGH THE MISSOURI OZARKS AND SOUTHEAST KANSAS.

SUTTON

THIS PRODUCT IS NOW AVAILABLE IN GRAPHICAL FORMAT...ALONG WITH OTHER
WEATHER...HYDROLOGICAL AND CLIMATE INFORMATION...AT
HTTP://WWW.CRH.NOAA.GOV/SGF

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 12:51 PM CDT	Severe Thunderstorm Warning	SGF	Dallas	39 min
Apr 18, 1:11 PM CDT	Severe Thunderstorm Warning	SGF	Camden, Laclede	64 min
Apr 18, 2:18 PM CDT	Severe Thunderstorm Warning	SGF	Greene	27 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2002 Every severe thunderstorm warning in 2002

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.