Alert archive / Missouri / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 307, NWS St. Louis, MO

June 21, 2008Washington County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 21, 2008, 5:54 PM CDT for Washington County, Missouri. It was in force for 51 min. 3 reports 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: Jun 21, 2008, 5:54 PM CDT (22:54 UTC)
Expired: Jun 21, 2008, 6:45 PM CDT
In force: 51 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon

County Washington County, MO

The radar

The St Louis radar (KLSX), 87 km from the middle of the area, began a volume at 22:55 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
Jun 21, 6:15 PM CDT	TSTM WND GST 60	Belgrade, MO	12 INCH DIAMETER TREE LIMBS WERE DOWNED OVER THE ROAD.
Jun 21, 6:31 PM CDT	HAIL 0.75	6 W Belgrade, MO	PENNY SIZE HAIL AND DAMAGING WINDS OCCURRING 6 MILES WEST OF BELGRADE MO.
Jun 21, 6:34 PM CDT	TSTM WND GST 65	6 W Belgrade, MO	LARGE TREE LIMBS DOWN 6 MILES WEST OF BELGRADE MO

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 21 minutes after it went out.

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, 10.9 hours before the alert went out and 286 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: 654 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 969 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 4 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 
WUUS53 KLSX 212254
SVRLSX
MOC221-212345-
/O.NEW.KLSX.SV.W.0307.080621T2254Z-080621T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
554 PM CDT SAT JUN 21 2008

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN WASHINGTON COUNTY IN EAST CENTRAL MISSOURI

* UNTIL 645 PM CDT

* AT 550 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 7 MILES
  WEST OF POTOSI...AND MOVING SOUTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SHIRLEY...
  POTOSI...
  MINERAL POINT...
  IRONDALE...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 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 ROADS QUICKLY SO DO NOT DRIVE INTO
AREAS WHERE WATER COVERS THE ROAD.

LAT...LON 3801 9064 3774 9065 3774 9111 3803 9110
      3803 9085
TIME...MOT...LOC 2254Z 307DEG 17KT 3791 9089

$$

BYRD

1 follow-up statement

000 
WWUS53 KLSX 212311
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
611 PM CDT SAT JUN 21 2008

MOC221-212345-
/O.CON.KLSX.SV.W.0307.000000T0000Z-080621T2345Z/
WASHINGTON MO-
611 PM CDT SAT JUN 21 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR SOUTHERN WASHINGTON COUNTY...

AT 609 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED
NEAR BELGRADE...OR ABOUT 9 MILES SOUTHWEST OF POTOSI...MOVING SOUTH
AT 23 MPH.

LOCATIONS NEAR THE PATH OF THE SEVERE THUNDERSTORM INCLUDE...
BELGRADE AND CALEDONIA.

LAT...LON 3801 9064 3774 9065 3774 9111 3803 9110
      3803 9085
TIME...MOT...LOC 2311Z 350DEG 20KT 3781 9084

$$

BYRD

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 St. Louis, MO wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 21, 4:23 PM CDT, 1 hour 31 minutes earlier.

Area forecast discussion, Jun 21, 4:23 PM CDT, 1 hour 31 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
423 PM CDT SAT JUN 21 2008

.DISCUSSION...
/423 PM CDT SAT JUN 21 2008/

MAIN CONCERNS OVER THE NEXT 60HRS WILL BE TIMING OF THE VARIOUS LO
LEVEL FOCI AND UPPER LEVEL DISTURBANCES THAT WILL BE CROSSING THRU
THE FA DURING THIS TIME IN THE NWLY MID LEVEL FLOW PATTERN THAT HAS
DOMINATED THE MID MS VALLEY THE PAST FEW DAYS. THIS WILL SIMPLY BE
REPEATED IN THE EXTENDED PERIOD.

SCATTERED TSRA IS FOLLOWING A TROF MOVING SWD THRU THE FA VERY
WELL...AND EXPECT THIS TO CONTINUE INTO THE SRN FA INTO THE ERY EVNG
HOURS BEFORE DISSPATING OR MOVING S OF THE FA. ROUND TWO FOR TONIGHT
WILL THEN COME WITH AN APPROACHING SHORTWAVE FROM THE NW WHICH WE
NOW SEE KICKING OFF TSRA OVER THE MID MO VALLEY. THIS SHOULD EVOLVE
TO A SML MCS AND MOVE SEWD INTO THE FA LATE TONIGHT AND SUNDAY
MORNING. THE EXPECTED BOUNDARY SHOULD LAY OUT FURTHER SWWD TO JUST S
OF THE I-70 CORRIDOR AND IGNITE NEW TSRA FOR THE AFTN HRS. THIS
ACTIVITY SHOULD ALL HEAD INTO THE SRN FA DURING SUNDAY EVENING.
ENOUGH INSTABILITY WILL EXIST TO CONTINUE SEVERE POTENTIAL DURING
SUNDAY AFTERNOON AND EARLY EVENING.

AFTER A BRIEF QUIET PERIOD ON MONDAY AND MONDAY NIGHT...LOOK FOR THE
NEXT ROUND OF TSRA ON TUESDAY AS MOISTURE RETURNS IN FULL FORCE
ALONG WITH THE NEXT IN A SERIES OF UPPER LEVEL DISTURBANCES AND A
WRMFNT NOSING N.

FOR THE EXTENDED PERIOD (TUESDAY NIGHT - SATURDAY)...GENERAL H500
FLOW PATTERN THAT WE HAVE BEEN EXAMINING THE PAST FEW DAYS HAS NOT
CHANGED MUCH WITH THIS RUN OF THE MEDIUM RANGE MODELS...WITH A
PERSISTENT NWLY FLOW...ALBEIT DE-AMPLIFIED SOME EARLY IN THE PERIOD.
THE SIGNALS ARE ALSO THERE THAT A SERIES OF DISTURBANCES WILL SLIDE
SEWD DOWN THIS FLOW AND KICK UP SOME TSRA JUST ABOUT EACH DAY.
TIMING IS ALSO DIFFICULT TO ASCERTAIN AT THIS TIME. SO SINCE I
INHERITED CHANCE POPS THRU THIS ENTIRE PERIOD...SEE NO REASON TO
CHANGE THEM AT THIS TIME. PERSISTENT SLY SFC FLOW...SO COMMON DURING
THE SUMMER MONTHS...WILL ALSO ALLOW DEWPOINTS TO CREEP UP TO AROUND
70F...ESPECIALLY WHEN EVAPOTRANSPIRATION IS TAKEN INTO ACCOUNT.
TEMPS WILL BE AT OR SLIGHTLY ABOVE NORMAL DURING THIS PERIOD...WITH
85-90F MAX TEMPS EXPECTED.

TES

&&

.AVIATION...
/1239 PM CDT SAT JUN 21 2008/

FOR THE 18Z TAFS...A COLD FRONT THAT EXTENDS FROM NORTHEASTERN
INDIANA THROUGH SOUTH CENTRAL ILLINOIS THEN INTO CENTRAL MISSOURI
WILL SLIDE SOUTH THROUGH THE REST OF THE AREA BY THIS EVENING.
THUNDERSTORMS ARE STILL EXPECTED TO DEVELOP ALONG AND BEHIND THE
FRONT AS IT MOVES SOUTH. HOWEVER...THUNDERSTORMS ARE EXPECTED TO
BE SCATTERED AND CHANCES OF THEM IMPACTING A TERMINAL ARE TOO
REMOTE TO INCLUDE IN TAFS. OTHERWISE...WINDS ARE EXPECTED TO BE
WESTERLY JUST AHEAD OF THE FRONT AND BECOME NORTHWEST TO NORTH
BEHIND THE FRONT. MCS DEVELOPMENT STILL A POSSIBILITY OVER WESTERN
IOWA TONIGHT WITH IT SLIDING SOUTHEAST TOWARDS TAF SITES...SO
ADDED VCTS/VCSH TO SITES BEGINNING AROUND 09Z FOR KUIN...10Z FOR
KCOU AND AROUND 12Z FOR KSUS/KSTL.

BYRD

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...NONE.
IL...NONE.
&&

WFO LSX

Hazardous weather outlook, Jun 21, 4:40 PM CDT, 1 hour 14 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
440 PM CDT SAT JUN 21 2008

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-221200-
GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-FAYETTE IL-CLINTON IL-
MARION IL-WASHINGTON IL-RANDOLPH IL-ADAMS IL-BROWN IL-PIKE IL-
CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL-MONROE IL-KNOX-LEWIS-
SHELBY-MARION-MONROE-RALLS-PIKE-BOONE-AUDRAIN-MONITEAU-COLE-OSAGE-
CALLAWAY-MONTGOMERY-LINCOLN-GASCONADE-WARREN-ST. CHARLES-FRANKLIN-
ST. LOUIS-ST. LOUIS CITY-JEFFERSON-CRAWFORD-WASHINGTON-
ST. FRANCOIS-STE. GENEVIEVE-IRON-MADISON-REYNOLDS-
440 PM CDT SAT JUN 21 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND
CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS.

.DAY ONE...TONIGHT

SCATTERED THUNDERSTORMS WILL CONTINUE OVER AREAS SOUTH OF
INTERSTATE 70 EARLY THIS EVENING. SOME STORMS MAY BE SEVERE WITH
LARGE HAIL TO ONE INCH IN DIAMETER AND GUSTY WINDS TO 60 MPH.

ADDITIONAL THUNDERSTORMS ARE POSSIBLE AFTER MIDNIGHT ACROSS
MAINLY CENTRAL AND NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS.
SOME OF THESE STORMS COULD BE SEVERE WITH LARGE HAIL AS THE
PRIMARY THREAT.

MODERATE TO MAJOR RIVER FLOODING IS OCCURRING ALONG PARTS OF THE
MISSISSIPPI AND ILLINOIS RIVERS. SEE THE APPROPRIATE FLOOD
STATEMENT FOR SPECIFIC DETAILS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THUNDERSTORMS ARE LIKELY OVER MUCH OF THE AREA ON SUNDAY...
ESPECIALLY DURING THE AFTERNOON AND EARLY EVENING HOURS. SOME
STORMS MAY BE SEVERE...ESPECIALLY FOR AREAS ABOUT 50 MILES EITHER
SIDE OF THE INTERSTATE 70 CORRIDOR.

THE CHANCE FOR THUNDERSTORMS WILL CONTINUE EACH DAY FROM TUESDAY
THROUGH FRIDAY.

MODERATE TO MAJOR RIVER FLOODING WILL CONTINUE ALONG PARTS OF THE
MISSISSIPPI AND ILLINOIS RIVERS. SEE THE APPROPRIATE FLOOD
STATEMENT FOR SPECIFIC DETAILS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE FOR PARTS OF SOUTHEAST MISSOURI
THROUGH EARLY EVENING. SPOTTERS ARE ENCOURAGED TO REPORT ANY SEVERE
WEATHER TO THE NATIONAL WEATHER SERVICE.

&&

FOR A GRAPHICAL VERSION OF THIS INFORMATION SEE OUR
WEBPAGE AT (LOWERCASE)... HTTP://WWW.WEATHER.GOV/LSX/?N=HWO1

TES

In the hours before

Local storm report, Jun 21, 3:35 PM CDT, 2 hours 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
335 PM CDT SAT JUN 21 2008

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

0330 PM     HAIL             1 NW LEMAY              38.54N  90.30W
06/21/2008  E0.88 INCH       ST. LOUIS          MO   TRAINED SPOTTER

            IN VICINITY OF HIGHWAYS 270 AND 21 AS WELL AS LINDBURGH
            AND TESSON FERRY ROAD IN CONCORD VILLAGE...MISSOURI.

&&

EVENT NUMBER 00496

SIPPRELL

Local storm report, Jun 21, 4:00 PM CDT, 1 hour 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
400 PM CDT SAT JUN 21 2008

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

0340 PM     TSTM WND DMG     2 SW PEVELY             38.27N  90.42W
06/21/2008                   JEFFERSON          MO   LAW ENFORCEMENT

            TREES AND POWER LINES REPORTED DOWN IN THE PEVELY AND
            HORINE MISSOURI REGION.

&&

EVENT NUMBER 00497

SIPPRELL

Local storm report, Jun 21, 4:08 PM CDT, 1 hour 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
408 PM CDT SAT JUN 21 2008

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

0405 PM     HAIL             1 NNE HILLSBORO         38.25N  90.56W
06/21/2008  E0.75 INCH       JEFFERSON          MO   TRAINED SPOTTER

            REPORTED AT THE INTERSECTION OF HIGHWAYS 21 AND A

&&

EVENT NUMBER 00498

TES

Local storm report, Jun 21, 4:23 PM CDT, 1 hour 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
423 PM CDT SAT JUN 21 2008

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

0417 PM     HAIL             3 ESE HILLSBORO         38.22N  90.52W
06/21/2008  E0.88 INCH       JEFFERSON          MO   TRAINED SPOTTER

&&

EVENT NUMBER 00499

SIPPRELL

Local storm report, Jun 21, 4:37 PM CDT, 1 hour 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
437 PM CDT SAT JUN 21 2008

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

0417 PM     HAIL             3 S FESTUS              38.18N  90.41W
06/21/2008  M1.00 INCH       JEFFERSON          MO   TRAINED SPOTTER

            QUARTER SIZE HAIL AND LARGE TREE LIMBS DOWN (GREATER
            THAN 6 INCHES0 3 MILES SOUTH OF FESTUS ON U.S. 67

&&

EVENT NUMBER 00500

PRZYBYLINSKI

Local storm report, Jun 21, 5:37 PM CDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
537 PM CDT SAT JUN 21 2008

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

0536 PM     HEAVY RAIN       3 ESE HILLSBORO         38.22N  90.52W
06/21/2008  M1.40 INCH       JEFFERSON          MO   TRAINED SPOTTER

&&

EVENT NUMBER 00501

SIPPRELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 2:35 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	40 min
Jun 21, 3:13 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	47 min
Jun 21, 3:21 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	39 min
Jun 21, 3:54 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve	51 min
Jun 21, 5:21 PM CDT	Severe Thunderstorm Warning	LSX	Washington	39 min
Jun 21, 6:21 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Iron, Washington	39 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2008 Every severe thunderstorm warning in 2008

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.