Alert archive / Illinois / Special Weather Statements in 2018

Special Weather Statement, NWS St. Louis, MO

July 14, 2018Bond County, Clinton County, Illinois

NWS St. Louis, MO issued this special weather statement at Jul 14, 2018, 4:59 PM CDT for Bond County, Clinton County, Illinois. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 14, 2018, 4:59 PM CDT (21:59 UTC)
Expired: Jul 14, 2018, 5:45 PM CDT
In force: 46 min
Issued by: NWS St. Louis, MO

Counties Bond County, IL, Clinton County, IL

The radar

The St Louis radar (KLSX), 99 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.0 hours before the alert went out and 179 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: 876 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 1076 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 172 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 14, 4:11 PM CDT, 48 minutes earlier.

Area forecast discussion, Jul 14, 4:11 PM CDT, 48 minutes before

Area Forecast Discussion
National Weather Service Saint Louis MO
411 PM CDT Sat Jul 14 2018

.SHORT TERM...  (Through Late Sunday Afternoon)
Issued at 328 PM CDT Sat Jul 14 2018

Scattered thunderstorms have developed across parts of the area
this afternoon. Some of these storms may be strong to severe this
evening with wind gusts the primary threat. Very steep low-level
lapse rates and high DCAPE has already helped yield a few wind
gusts of around 50mph earlier this afternoon.

Believe there probably will be a bit of a lull in convective
activity late this evening into the early overnight hours as
diurnal instability weakens. Another round of storms is expected
to focus roughly along and just south of the I-70 corridor in
response to a slowly moving remnant MCV which is currently in E KS
and increasing low-level moisture convergence.

Convective trends through the day on Sunday a bit more uncertain.
Expect ongoing storms to gradually push off to the ENE and weaken as
the low-level jet abates and veers. Convective coverage a big
unknown as area should see a bit of mid/upper level subsidence
behind departing vorticity maxima associated with the departing MCV.
Frontal boundary will still likely reside across the bi-state area
so kept isolated-scattered wording for the afternoon hours.

High temperatures should be at least several degrees cooler than
that experienced today due to the possibility of storms and
convective debris clouds. Still will be very humid over with
dewpoints in the low to mid 70s, though max heat index values
areawide should stay in the mid to upper 90s so will allow heat
advisory to expire this evening.

Gosselin

.LONG TERM...  (Sunday Night through Next Saturday)
Issued at 328 PM CDT Sat Jul 14 2018

There is a chance for SHRA/TSRA from Sunday night through Monday
evening as a slow-moving PV anomaly and its associated surface
front move across the region. Multiple outflow boundaries from
earlier convection will also serve as the focus for
diurnally-driven convective development.

A low pressure system moving through southern Canada will
suppress part of the upper ridge over the CONUS, leading to
weakly northwest flow aloft over our area. A brief period of
mostly dry weather is anticipated on Tue/Tue night before a
series of PV anomalies move through the flow and bring a chance
of SHRA/TSRA to the area during the middle of the week. The upper
ridge rebuilds and shifts eastward at the end of the week,
potentially bringing a period of dry weather back to the LSX CWA
for the end of the week and early next weekend.

Temperatures are forecast to be several degrees cooler than they
have been lately with highs in the upper 80s to lower 90s and
overnight lows in the upper 60s to around 70 degrees.

Kanofsky

&&

.AVIATION...  (For the 18z TAFs through 18z Sunday Afternoon)
Issued at 1248 PM CDT Sat Jul 14 2018

Scattered showers and thunderstorms are likely this afternoon and
early evening across the bi-state area. Greatest coverage during
this period is most likely over central Missouri so added a TEMPO
group in for KCOU. Will monitor convective trends and update as
necessary. May be a bit of a lull in activity late evening and
early overnight hours but additional storms are expected late
tonight into early Sunday morning. Stronger storms will be capable
of reduced visibilities and potentially some strong wind gusts.

SPECIFICS FOR KSTL:

Scattered storms late this afternoon into at least early this
evening. Maintained VCTS wording for now due to scattered nature
expected but will continue to monitor and amend as necessary.
Probably will be a bit of a lull in storm activity late evening
into the early overnight period before additional storms affect
the terminal late tonight into early Sunday morning.

Gosselin

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...Heat Advisory until 8 PM CDT this evening for Boone MO-Callaway
     MO-Cole MO-Crawford MO-Franklin MO-Gasconade MO-Iron MO-
     Jefferson MO-Lincoln MO-Madison MO-Moniteau MO-Montgomery
     MO-Osage MO-Pike MO-Reynolds MO-Saint Charles MO-Saint
     Francois MO-Saint Louis City MO-Saint Louis MO-Sainte
     Genevieve MO-Warren MO-Washington MO.

IL...Heat Advisory until 8 PM CDT this evening for Bond IL-Calhoun IL-
     Clinton IL-Fayette IL-Greene IL-Jersey IL-Macoupin IL-
     Madison IL-Marion IL-Monroe IL-Montgomery IL-Pike IL-
     Randolph IL-Saint Clair IL-Washington IL.

&&

WFO LSX

Hazardous weather outlook, Jul 14, 3:42 PM CDT, 1 hour 17 minutes before

Hazardous Weather Outlook
National Weather Service Saint Louis MO
342 PM CDT Sat Jul 14 2018

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-151200-
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-Saint 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-Saint Charles MO-Franklin MO-
Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO-
Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO-
Madison MO-Reynolds MO-
342 PM CDT Sat Jul 14 2018

This hazardous weather outlook is for portions of eastern and
central Missouri as well as west central and southwest Illinois.

.DAY ONE...Late this afternoon and tonight

Heat index values of 100 to 107 degrees are occurring this
afternoon across parts of Missouri and Illinois. A Heat Advisory
is in effect through 8 PM CDT for these areas.

Scattered thunderstorms have developed across the area this
afternoon and will continue this evening. A few storms may be
strong to severe and capable of producing hail and damaging wind
gusts.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

There is a chance of thunderstorms for portions of the area from
Sunday through Monday night. There is also a chance of
thunderstorms from Wednesday through Friday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and this evening.

Kanofsky

In the hours before

Local storm report, Jul 14, 4:09 PM CDT, 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
409 PM CDT SAT JUL 14 2018

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

0358 PM     TSTM WND GST     1 NE CASEYVILLE         38.64N 90.02W
07/14/2018  M71 MPH          ST. CLAIR          IL   PUBLIC

&&

PW

Local storm report, Jul 14, 4:13 PM CDT, 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
413 PM CDT SAT JUL 14 2018

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

0352 PM     TSTM WND DMG     2 ESE SAINT LOUIS       38.63N 90.21W
07/14/2018                   ST. LOUIS CITY     MO   PUBLIC

            LARGE TREE SNAPPED AT BASE.

&&

PW

Special weather statement, Jul 14, 4:14 PM CDT, 45 minutes before

Special Weather Statement
National Weather Service St Louis MO
414 PM CDT SAT JUL 14 2018

ILZ058-099-142200-
Greene IL-Jersey IL-
414 PM CDT SAT JUL 14 2018

...SIGNIFICANT WEATHER ADVISORY FOR GREENE AND NORTHERN JERSEY
COUNTIES UNTIL 500 PM CDT...

At 414 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Alsey to near Carrollton to near Hardin.
Movement was east at 25 mph.

Dime size hail and wind gusts of 50 to 55 mph will be possible with
these storms.

Locations impacted include...
White Hall, Carrollton, Roodhouse, Greenfield, Athensville, Old Kane,
Kemper, Patterson, Kane, Wrights, Eldred, Hillview, Rockbridge,
Belltown, Berdan, Haypress, Barrow, Walkersville and Woody.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3936 9016 3913 9017 3915 9058 3932 9058
      3952 9056 3952 9016
TIME...MOT...LOC 2114Z 262DEG 23KT 3950 9049 3933 9049 3917 9054

Britt

Local storm report, Jul 14, 4:41 PM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
441 PM CDT SAT JUL 14 2018

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

0422 PM     TSTM WND GST     ALTON                   38.91N 90.16W
07/14/2018  M54 MPH          MADISON            IL   AWOS

&&

CMK

Local storm report, Jul 14, 4:54 PM CDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
454 PM CDT SAT JUL 14 2018

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

0415 PM     TSTM WND DMG     FOSTER TOWNSHIP         38.97N 90.08W
07/14/2018                   MADISON            IL   LAW ENFORCEMENT

            LARGE TREE DOWN ALONG MCCOY ROAD.

&&

CMK

Special weather statement, Jul 14, 4:59 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service St Louis MO
459 PM CDT SAT JUL 14 2018

ILZ064-069-100-142245-
Bond IL-Madison IL-Clinton IL-
459 PM CDT SAT JUL 14 2018

...SIGNIFICANT WEATHER ADVISORY FOR CLINTON...BOND COUNTIES IN SOUTH
CENTRAL ILLINOIS AND SOUTHEASTERN MADISON COUNTIES IN SOUTHWESTERN
ILLINOIS UNTIL 545 PM CDT...

At 459 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Alhambra to near Highland to Trenton.
Movement was east at 20 mph.

Dime size hail and wind gusts of 50 to 55 mph will be possible with
these storms.

Locations impacted include...
Highland, Greenville, Breese, Carlyle, Trenton, Aviston, St. Rose,
Germantown, Albers, Beckemeyer, Pocahontas, Alhambra, Mulberry Grove,
Tamalco, Beaver Creek, Woburn, Reno, Jamestown, Pleasant Mound and
Pierron.

This includes Interstate 70 in Illinois between exits 24 and 52.

This also includes  Carlyle Lake Recreational Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3851 8929 3856 8970 3865 8971 3866 8973
      3871 8973 3885 8977 3896 8966 3903 8927
      3873 8925
TIME...MOT...LOC 2159Z 265DEG 18KT 3887 8970 3872 8964 3859 8968

Britt

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 7:07 PM CDT	Areal Flood Advisory	LSX	Knox	4 hr
Jul 13, 7:51 PM CDT	Special Weather Statement	LSX	Boone	24 min
Jul 13, 11:59 PM CDT	Special Weather Statement	LSX	Boone	46 min
Jul 14, 2:40 PM CDT	Special Weather Statement	LSX	Pike	50 min
Jul 14, 2:41 PM CDT	Special Weather Statement	LSX	Sainte Genevieve, Saint Francois	49 min
Jul 14, 3:02 PM CDT	Special Weather Statement	LSX	Lewis	43 min
Jul 14, 3:11 PM CDT	Severe Thunderstorm Warning	LSX	Pike	49 min
Jul 14, 3:27 PM CDT	Special Weather Statement	LSX	City of Saint Louis	33 min
Jul 14, 3:49 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	41 min
Jul 14, 5:24 PM CDT	Special Weather Statement	LSX	Saint Louis, City of Saint Louis	51 min
Jul 14, 5:44 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	46 min
Jul 14, 1:19 PM CDT	Special Weather Statement	LSX	Fayette	41 min
Jul 14, 2:00 PM CDT	Special Weather Statement	LSX	Fayette	45 min
Jul 14, 2:10 PM CDT	Severe Thunderstorm Warning	LSX	Fayette	35 min
Jul 14, 3:35 PM CDT	Special Weather Statement	LSX	Adams	40 min
Jul 14, 4:14 PM CDT	Special Weather Statement	LSX	Greene	46 min
Jul 14, 4:23 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison, Montgomery	52 min
Jul 14, 4:29 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Jersey, Macoupin	46 min
Jul 14, 5:12 PM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Montgomery	39 min
Jul 14, 5:18 PM CDT	Severe Thunderstorm Warning	LSX	Clinton	57 min
Jul 14, 6:27 PM CDT	Special Weather Statement	LSX	Clinton, Saint Clair	48 min

Nearby

Special Weather Statements in Illinois, 2018 Every special weather statement in 2018

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; radar from the NEXRAD Level II archive.