Severe Thunderstorm Warning 134, NWS St. Louis, MO

148 
WWUS53 KLSX 042108
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
408 PM CDT WED JUN 4 2014

ILC133-157-MOC099-186-042130-
/O.CON.KLSX.SV.W.0134.000000T0000Z-140604T2130Z/
MONROE IL-RANDOLPH IL-JEFFERSON MO-STE. GENEVIEVE MO-
408 PM CDT WED JUN 4 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
STE. GENEVIEVE...SOUTHEASTERN JEFFERSON...NORTHWESTERN RANDOLPH AND
SOUTHERN MONROE COUNTIES UNTIL 430 PM CDT...

AT 407 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 7 MILES NORTH OF
BLOOMSDALE...AND MOVING EAST AT 35 MPH.

HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO
         ROOFS...SIDING AND TREES.

LOCATIONS IMPACTED INCLUDE...
BLOOMSDALE...KIDD...RENAULT...PRAIRIE DU ROCHER AND AMES.

THIS WARNING ALSO INCLUDES...
INTERSTATE 55 IN MISSOURI FROM EXIT 157 TO EXIT 174.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT
IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE
TO A PLACE OF SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT
OR SMALL INTERIOR ROOM.

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3824 9038 3821 9003 3808 9005 3798 9015
      3807 9050
TIME...MOT...LOC 2109Z 287DEG 33KT 3809 9024

HAIL...1.00IN
WIND...60MPH

$$

TILLY

526 
WWUS53 KLSX 042130
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
430 PM CDT WED JUN 4 2014

ILC133-157-MOC099-186-042139-
/O.EXP.KLSX.SV.W.0134.000000T0000Z-140604T2130Z/
MONROE IL-RANDOLPH IL-JEFFERSON MO-STE. GENEVIEVE MO-
430 PM CDT WED JUN 4 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN STE. GENEVIEVE...
SOUTHEASTERN JEFFERSON...NORTHWESTERN RANDOLPH AND SOUTHERN MONROE
COUNTIES WILL EXPIRE AT 430 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA. HOWEVER...ANOTHER SEVERE THUNDERSTORM WARNING REMAINS IN 
EFFECT FOR EASTERN STE. GENEVIEVE AND SOUTHWESTERN RANDOLPH COUNTIES 
UNTIL 515 PM.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 800 PM. 

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN ST LOUIS.

LAT...LON 3824 9038 3821 9003 3808 9005 3798 9015
      3807 9050
TIME...MOT...LOC 2129Z 299DEG 26KT 3798 9015

$$

TILLY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
251 PM CDT Wed Jun 4 2014

.SHORT TERM:  (Through Late Tonight)
Issued at 211 PM CDT Wed Jun 4 2014

A synoptic cold front was located across central/southern MO into
southern IL at 19z this afternoon. Scattered thunderstorms have
developed near and south of the boundary within a moist and
unstable air mass. 0-6 km shear values of 40-60 kts are sufficient
for supercells, and any storms near the cold front will need to be
closely monitored for tornadic potential because of locally
enhanced vorticity invof the frontal zone. A thunderstorm complex
may eventually evolve late this afternoon or early this evening
across parts of southern MO/IL. The severe weather threat across
the LSX CWA should end early tonight, but scattered thunderstorms
remain possible through the overnight hours across the southern
CWA.

Kanofsky

.LONG TERM:  (Thursday through Next Wednesday)
Issued at 211 PM CDT Wed Jun 4 2014

A surface high pressure center shifting into the western Great
Lakes will nudge the boundary farther southward tonight and
tomorrow. This boundary then meanders across the region and
provides a focus for SHRA/TSRA as multiple mid/upper features
interact with the boundary over the next several days. Expect
temperatures to be generally cooler over the next few days (highs
in the mid 70s to lower 80s) in comparison to the recent warmer
weather.

The first mid/upper feature is an elongated trough moving through
the northern plains which will provide some large-scale lift on
Thu aftn/eve. Some models also show a southern stream vort max
moving through NE/MO during this time, but the sudden appearance
of this feature suggests convective feedback. With the surface
boundary forecast to be across southwestern MO by 18z, convection
should be initially limited to the southwestern part of the CWA
during the afternoon hours, although it is possible that remnants
from an overnight convective complex could move into the
northwestern CWA. Once the boundary lifts northeastward as a warm
front on Thu night and a nocturnal LLJ begins to impinge on the
H85 front, scattered convection should spread across most of the
CWA during the evening hours.

Another shortwave then approaches MO/IL on Fri night and Sat.
Moisture convergence on the nose of the LLJ should support
convection on late Fri night and Sat morning. Some models also
depict a wave on the boundary which develops into a closed surface
low, and this may provide additional support for precipitation on
Sat. Model solutions depict yet another shortwave approaching the
area from the northwest on Sun night/Mon, however model
variability increases after early next week. Gridded PoPs in the
20-35% range are near the climatological average for this time of
year, therefore the higher PoP values were reserved for time
periods with identifiable synoptic features.

Kanofsky

&&

.AVIATION:  (For the 18z TAFs through 18z Thursday Afternoon)
Issued at 103 PM CDT Wed Jun 4 2014

Cold front has moved south through all of the TAF sites at this
point. Expect redevelopment of thunderstorms to stay south of the
terminals this afternoon. There could also be some MVFR ceilings
to the north of the front, though confidence is not high enough to
include them in the TAFS. Main issue will be that I expect either
low MVFR or IFR ceilings to move into the area after 06Z tonight
and linger over the area through mid morning Saturday. Have
included them in all of the TAF sites.

Specifics for KSTL:

Expect low ceilings to develop at the TAF site late tonight. There
is some possibility that they will fall into the IFR category, but
for now think that they will stay MVFR. Will show only slow
clearing tomorrow.

Britt

&&

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

WFO LSX

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
329 PM CDT WED JUN 4 2014

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-051200-
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 MO-
LEWIS MO-SHELBY MO-MARION MO-MONROE MO-RALLS MO-PIKE MO-BOONE MO-
AUDRAIN MO-MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO-MONTGOMERY MO-
LINCOLN MO-GASCONADE MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO-
ST. LOUIS MO-ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO-
WASHINGTON MO-ST. FRANCOIS MO-STE. GENEVIEVE MO-IRON MO-
MADISON MO-REYNOLDS MO-
329 PM CDT WED JUN 4 2014

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

.DAY ONE...TONIGHT

THERE IS A RISK OF SEVERE THUNDERSTORMS THROUGH EARLY TONIGHT
ACROSS PORTIONS OF CENTRAL AND SOUTHEAST MISSOURI AS WELL AS
SOUTHWEST ILLINOIS. THE PRIMARY THREAT FROM THESE STORMS WILL BE
DAMAGING WINDS HOWEVER ISOLATED TORNADOES ARE ALSO POSSIBLE.
SCATTERED THUNDERSTORMS MAY CONTINUE OVERNIGHT ACROSS PARTS OF
SOUTHERN MISSOURI HOWEVER THESE STORMS ARE NOT EXPECTED TO BE
SEVERE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THERE IS A RISK OF SEVERE THUNDERSTORMS ACROSS SOUTHEAST MISSOURI
ON THURSDAY AND THURSDAY NIGHT.

THERE IS A CHANCE OF THUNDERSTORMS ACROSS THE ENTIRE AREA THROUGH
TUESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT ANY SEVERE WEATHER OR STORM
DAMAGE TO THE NATIONAL WEATHER SERVICE.

KANOFSKY

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
1001 AM CDT WED JUN 04 2014

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

0645 AM     HEAVY RAIN       ST. ANN                 38.73N  90.39W
06/04/2014  M1.07 INCH       ST. LOUIS          MO   TRAINED SPOTTER

            RAIN FELL IN 40 MINUTES.

&&

FUCHS