Alert archive / Illinois / Special Weather Statements in 2011

Special Weather Statement, NWS Lincoln, IL

April 9, 2011Macon County, Illinois

NWS Lincoln, IL issued this special weather statement at Apr 9, 2011, 5:05 AM CDT for Macon County, Illinois. It was in force for 40 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: Apr 9, 2011, 5:05 AM CDT (10:05 UTC)
Expired: Apr 9, 2011, 5:45 AM CDT
In force: 40 min
Issued by: NWS Lincoln, IL

County Macon County, IL

The radar

The Lincoln radar (KILX), 59 km from the middle of the area, began a volume at 10:04 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 00:00Z, 10.1 hours before the alert went out and 56 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 637 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 158 m²/s²
0-3 km storm-relative helicity: 242 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.

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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 Lincoln, IL wrote its last area forecast discussion before this special weather statement went out at Apr 9, 2:53 AM CDT, 2 hours 12 minutes earlier.

Area forecast discussion, Apr 9, 2:53 AM CDT, 2 hours 12 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
253 AM CDT SAT APR 9 2011

.DISCUSSION...
ISSUED 253 AM CDT SAT APR 9 2011

WARM FRONT DRAPED JUST SOUTHWEST OF OUR CWA EARLY THIS MORNING.
LARGE MCS HAS BEEN ROLLING ACROSS MISSOURI THE LAST FEW HOURS...
AND ACTIVITY IS JUST CROSSING THE MISSISSIPPI RIVER NEAR QUINCY.
MCS ALSO HAS BEEN SHOWING SIGNS OF SPLITTING INTO TWO...WITH THE
SOUTHERN AREA ACROSS SOUTHWEST MISSOURI. LOW STRATUS DECK
BLANKETING THE NORTHERN 2/3 OF THE CWA JUST NORTH OF THE
FRONT...WITH SOME LOWER VISIBILITIES BELOW 2 MILES AT TIMES.

WHILE THE SHORT-TERM CONCERN IS WITH THE STORMS MOVING OUT OF
MISSOURI...THE PRIMARY FORECAST CONCERN REMAINS THE POTENTIALLY
SIGNIFICANT SEVERE WEATHER OUTBREAK SUNDAY NIGHT.

SHORT TERM...TODAY THROUGH MONDAY...

SOUTHERN PART OF THE MCS INDICATED BY MOST MODELS TO SHOW SOME
SORT OF SOUTHEAST CURVE AS IT MOVES INTO THE STATE...WHILE THE
NORTHERN SEGMENT LIFTS EAST-NORTHEAST AND HAS RECENTLY SHOWN SIGNS
OF DEVELOPMENT WELL NORTH OF THE MAIN CLUSTER OF STORMS. EXTENT OF
POPS WILL LIKELY BE MADE AS A LAST MINUTE CALL...AND MAY NEED TO
INCLUDE A PRE-1ST PERIOD SEGMENT IN THE ZONES TO ADEQUATELY
ADDRESS THE PRESENT ACTIVITY IN THE WEST.

MOST OF THE MODELS INDICATE THE FRONT SHOULD LIFT NORTH OF THE
CWA BY MIDDAY...WITH THE GFS LAGGING BEHIND BY A COUPLE HOURS.
WITH THAT IN MIND...AM EXPECTING HIGHS IN THE LOWER TO MID 80S
ACROSS MOST OF THE CWA...EXCEPT PERHAPS SOME UPPER 70S NORTH OF
THE I-74 CORRIDOR. ANOTHER WARM DAY EXPECTED SUNDAY...WHICH WILL
ALSO BE QUITE WINDY. SHOULD SEE WINDS GUSTING TO 30-35 MPH BY
AFTERNOON.

LATEST SPC CONVECTIVE OUTLOOK FOR SUNDAY/SUNDAY NIGHT KEEPS THE
NORTHWEST THIRD OF THE CWA IN A MODERATE RISK OF SEVERE. INSTABILITY
INCREASES SIGNIFICANTLY WITH MUCAPES 2000-3000 J/KG BY AFTERNOON.
SHOULD SEE A RATHER SIZEABLE CAP THOUGH... WITH EROSION BEGINNING
ACROSS THE FAR WESTERN CWA BY LATE AFTERNOON. MAIN ACTIVITY SHOULD
BEGIN FORMING ACROSS IOWA AND MISSOURI BY LATE AFTERNOON...THEN
MOVE EAST. ZERO-1KM HELICITY AROUND 175 M2/S2 NEAR THE
MISSISSIPPI RIVER BY 00Z WOULD SUPPORT SOME POTENTIAL TORNADIC
ACTIVITY INITIALLY...BUT SYSTEM SHOULD EVOLVE INTO MORE OF A
SQUALL LINE AS IT CROSSES OUR CWA AS WINDS ALOFT ON THE FORECAST
SOUNDINGS BECOME MORE UNIDIRECTIONAL FURTHER EAST. TEMPERATURE
LAPSE RATES OF 8-9 C/KM INDICATING HAIL POTENTIAL AS WELL. SEVERE
THREAT AFTER MIDNIGHT SHOULD MAINLY BE ACROSS THE EASTERN
CWA...THEN DONE BY SUNRISE AS COLD FRONT PUSHES OUT OF THE AREA.

DEEP UPPER TROUGH WILL BE CROSSING THE CWA ON MONDAY. WRAPAROUND
FLOW AROUND THE PARENT LOW WILL RESULT IN WINDY CONDITIONS AGAIN.
HAVE KEPT SOME SLIGHT CHANCE POPS IN MOST OF THE AREA FOR SOME
SHOWERS...ALTHOUGH MOST OF THE MODELS SUGGESTING THE DRY SLOT
SHOULD KEEP THE MAIN THREAT TO THE NORTH.

LONG TERM...TUESDAY THROUGH FRIDAY...

NO REAL CHANGES MADE TO THIS PART OF THE FORECAST. UPPER RIDGING
EXPECTED TO BE BUILDING ACROSS THE CENTRAL UNITED STATES THROUGH
MIDWEEK. GFS AND ECMWF SHOWING A TROUGH WORKING ITS WAY ACROSS THE
NATION...BUT THE ECMWF DIGS THE TROUGH MUCH DEEPER AND SLOWS ANY
ASSOCIATED RAINFALL INTO OUR AREA.

GEELHART

&&

.AVIATION...
ISSUED 1155 PM CDT FRI APR 8 2011

QUASI-STATIONARY FRONT LIES ACROSS SOUTHERN IL WESTWARD THROUGH
CENTRAL MO AND EASTERN KY. CONVECTION HAS DEVELOPED NORTH OF THIS
BOUNDARY ACROSS CENTRAL/NORTHERN MO...AND IS IN A POSITION TO
POSSIBLY AFFECT SPI AND/OR DEC BY 09Z. AIRMASS ATOP THE STABLE
BOUNDARY LAYER CONTINUES UNSTABLE WITH INCREASING MID LEVEL MOISTURE
AND STEEP LAPSE RATES. MEAN STORM MOTION VECTORS SUGGEST THAT THE
STORMS SOUTHWEST OF IRK WILL CONTINUE EASTWARD AND THEN TURN A
LITTLE SOUTHEAST ON THE EASTERN EDGE OF THE UPPER RIDGE. WILL PUT IN
A TEMPO FOR THUNDER AT SPI/DEC WITH THIS IN MIND. LOW CLOUDS
CONTINUE NORTH OF A BRL-CMI LINE...WITH SOME MINOR FLUCTUATIONS IN
THE CLOUD EDGE. EXPECT CLOUDS BELOW 1K FT TO CONTINUE AT
PIA/BMI...AND FLIRT OCCASIONALLY WITH CMI. IN ADDITION...MOST
TERMINALS ARE NOW GETTING INCREASING FOG. THIS WILL CONTINUE UNTIL
THE SURFACE FRONT TO THE SOUTH MAKES ITS RETURN NORTHWARD AS A WARM
FRONT 15Z-18Z SAT. THE NAM MODEL AND ITS 4KM WRF-NMM VERSION BOTH
PUSH THE MORNING CONVECTION EAST OF THE AREA BY 18Z SAT...WHICH
COULD DELAY THE RETURN OF THE WARM FRONT A LITTLE. PREVIOUS TAFS HAD
A 16Z-18Z TIMING...SO WILL PUT A COUPLE HOUR DELAY INTO THE 06Z
TAFS. ONCE THE TERMINALS ARE WITHIN THE WARM SECTOR...PRECIPITATION
CHANCES SHOULD DIMINISH ALONG WITH ANY LINGERING LOW CLOUDS/FOG.
WINDS WILL THEN BE MAINLY FROM THE SOUTH 10-12 KT...THEN INCREASING
AFT 00Z SUN AS THE PRESSURE GRADIENT TIGHTENS IN RESPONSE TO
PRESSURE FALLS OUT WEST.

04
&&

.ILX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

Hazardous weather outlook, Apr 8, 3:00 PM CDT, 14 hours 5 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LINCOLN IL
300 PM CDT FRI APR 8 2011

ILZ027>031-036>038-040>042-047>051-091100-
CASS-FULTON-KNOX-LOGAN-MARSHALL-MASON-MCLEAN-MENARD-MORGAN-PEORIA-
SANGAMON-SCHUYLER-SCOTT-STARK-TAZEWELL-WOODFORD-
300 PM CDT FRI APR 8 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
ILLINOIS.

.DAY ONE...TONIGHT

ISOLATED THUNDERSTORMS WILL DEVELOP LATE TONIGHT IN ADVANCE OF A
WARM FRONT LIFTING NORTHWARD THROUGH SOUTHERN ILLINOIS. SEVERE
WEATHER IS NOT ANTICIPATED...HOWEVER A FEW OF THE STORMS WILL BE
CAPABLE OF PRODUCING SMALL HAIL AND GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

ISOLATED THUNDERSTORMS WILL BE POSSIBLE ON SATURDAY AS WELL...AS
THE WARM FRONT ARRIVES IN CENTRAL ILLINOIS. A FEW OF THE STORMS
WILL BE CAPABLE OF PRODUCING SMALL HAIL AND GUSTY WINDS.

A VIGOROUS STORM SYSTEM WILL BRING A MUCH BETTER CHANCE FOR
THUNDERSTORMS BY SUNDAY NIGHT. AT THIS TIME...IT APPEARS STRONG TO
SEVERE THUNDERSTORMS WILL DEVELOP ALONG AN ADVANCING COLD FRONT
ACROSS IOWA AND NORTHERN MISSOURI LATE SUNDAY AFTERNOON...THEN
WILL SHIFT INTO THE ILLINOIS RIVER VALLEY SUNDAY EVENING. LARGE
HAIL...DAMAGING WINDS...AND A FEW TORNADOES WILL BE POSSIBLE.
STAY TUNED TO LATER FORECASTS FOR UPDATES ON THIS POTENTIALLY
SIGNIFICANT WEATHER EVENT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT.

ILZ043>046-052>057-061-091100-
CHAMPAIGN-CHRISTIAN-COLES-DE WITT-DOUGLAS-EDGAR-MACON-MOULTRIE-
PIATT-SHELBY-VERMILION-
300 PM CDT FRI APR 8 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
ILLINOIS AND EAST CENTRAL ILLINOIS.

.DAY ONE...TONIGHT

ISOLATED THUNDERSTORMS WILL DEVELOP LATE TONIGHT IN ADVANCE OF A
WARM FRONT LIFTING NORTHWARD THROUGH SOUTHERN ILLINOIS. SEVERE
WEATHER IS NOT ANTICIPATED...HOWEVER A FEW OF THE STORMS WILL BE
CAPABLE OF PRODUCING SMALL HAIL AND GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

ISOLATED THUNDERSTORMS WILL BE POSSIBLE ON SATURDAY AS WELL...AS
THE WARM FRONT ARRIVES IN CENTRAL ILLINOIS. A FEW OF THE STORMS
WILL BE CAPABLE OF PRODUCING SMALL HAIL AND GUSTY WINDS.

A VIGOROUS STORM SYSTEM WILL BRING A MUCH BETTER CHANCE FOR
THUNDERSTORMS BY SUNDAY NIGHT. AT THIS TIME...IT APPEARS STRONG TO
SEVERE THUNDERSTORMS WILL DEVELOP ALONG AN ADVANCING COLD FRONT
ACROSS IOWA AND NORTHERN MISSOURI LATE SUNDAY AFTERNOON...THEN
WILL SHIFT INTO EAST CENTRAL ILLINOIS BY LATE SUNDAY EVENING INTO
THE OVERNIGHT HOURS. THE GREATEST THREAT FOR WIDESPREAD SEVERE
WEATHER WILL LIKELY REMAIN WEST OF I-55...HOWEVER LARGE HAIL AND
DAMAGING WINDS WILL BE POSSIBLE. STAY TUNED TO LATER FORECASTS FOR
UPDATES ON THIS POTENTIALLY SIGNIFICANT WEATHER EVENT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT.

ILZ062-063-066>068-071>073-091100-
CLARK-CLAY-CRAWFORD-CUMBERLAND-EFFINGHAM-JASPER-LAWRENCE-RICHLAND-
300 PM CDT FRI APR 8 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL
ILLINOIS AND SOUTHEAST ILLINOIS.

.DAY ONE...TONIGHT

AS AN UPPER LEVEL DISTURBANCE INTERACTS WITH A STATIONARY FRONTAL
BOUNDARY ACROSS SOUTHERN ILLINOIS...SCATTERED THUNDERSTORMS WILL
DEVELOP LATE TONIGHT. A FEW OF THE STORMS COULD BECOME SEVERE...WITH
LARGE HAIL AND DAMAGING WIND GUSTS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

ISOLATED THUNDERSTORMS WILL BE POSSIBLE ON SATURDAY AS WELL...AS
THE FRONT LIFTS NORTHWARD INTO CENTRAL ILLINOIS. A FEW OF THE
STORMS WILL BE CAPABLE OF PRODUCING SMALL HAIL AND GUSTY WINDS.

A VIGOROUS STORM SYSTEM WILL BRING A MUCH BETTER CHANCE FOR
THUNDERSTORMS BY SUNDAY NIGHT. AT THIS TIME...IT APPEARS STRONG TO
SEVERE THUNDERSTORMS WILL DEVELOP ALONG AN ADVANCING COLD FRONT
ACROSS IOWA AND NORTHERN MISSOURI LATE SUNDAY AFTERNOON...THEN
WILL SHIFT INTO SOUTHEAST ILLINOIS BY LATE SUNDAY EVENING INTO THE
OVERNIGHT HOURS. THE GREATEST THREAT FOR WIDESPREAD SEVERE WEATHER
WILL LIKELY REMAIN WEST OF I-55...HOWEVER LARGE HAIL AND DAMAGING
WINDS WILL BE POSSIBLE. STAY TUNED TO LATER FORECASTS FOR UPDATES
ON THIS POTENTIALLY SIGNIFICANT WEATHER EVENT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED AFTER MIDNIGHT TONIGHT.

BARNES

In the hours before

Special weather statement, Apr 9, 3:29 AM CDT, 1 hour 36 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
329 AM CDT SAT APR 9 2011

ILZ047-049-050-090930-
CASS-MORGAN-SCOTT-
329 AM CDT SAT APR 9 2011

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN MORGAN...NORTHERN SCOTT
AND SOUTHEASTERN CASS COUNTIES UNTIL 430 AM CDT...

AT 328 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR NAPLES...OR 10 MILES NORTHWEST OF
WINCHESTER...MOVING EAST AT 30 MPH.

PENNY SIZE HAIL...AND WINDS AROUND 50 MPH ARE EXPECTED WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
  EXETER...
  BLUFFS...
  MEREDOSIA...
  CHAPIN...
  JACKSONVILLE...
  LITERBERRY...

OTHER LOCATIONS AFFECTED INCLUDE...OXVILLE...RIGGSTON...MERRITT...
LYNNVILLE...CONCORD AND SOUTH JACKSONVILLE.

PEOPLE NEAR THESE LOCATIONS SHOULD MONITOR THE WEATHER SITUATION
CLOSELY. LISTEN FOR POSSIBLE WARNINGS...AND BE PREPARED TO TAKE
APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN.

LAT...LON 3981 9060 3982 9058 3984 9058 3986 9058
      3988 9000 3966 8999 3963 9062 3967 9064
TIME...MOT...LOC 0830Z 258DEG 27KT 3972 9060

AUTEN

Local storm report, Apr 9, 5:05 AM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
505 AM CDT SAT APR 09 2011

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

0504 AM     HAIL             STONINGTON              39.64N 89.19W
04/09/2011  E0.88 INCH       CHRISTIAN          IL   TRAINED SPOTTER

            PEA AND NICKEL SIZE HAIL COVERING THE GROUND.

&&

AJ

Special weather statement, Apr 9, 5:05 AM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
505 AM CDT SAT APR 9 2011

ILZ052-053-061-091045-
CHRISTIAN-MACON-SHELBY-
505 AM CDT SAT APR 9 2011

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN CHRISTIAN...NORTHERN
SHELBY AND SOUTHERN MACON COUNTIES UNTIL 545 AM CDT...

AT 504 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR STONINGTON...OR 11 MILES NORTHEAST OF
TAYLORVILLE...MOVING EAST AT 25 MPH.

NICKEL SIZE HAIL...AND WINDS AROUND 50 MPH ARE EXPECTED WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
  BLUE MOUND...
  MOWEAQUA...
  MACON...
  MOUNT ZION...

PEOPLE NEAR THESE LOCATIONS SHOULD MONITOR THE WEATHER SITUATION
CLOSELY. LISTEN FOR POSSIBLE WARNINGS...AND BE PREPARED TO TAKE
APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN.

LAT...LON 3982 8876 3973 8882 3963 8882 3959 8920
      3972 8925
TIME...MOT...LOC 1005Z 252DEG 24KT 3966 8914

AUTEN

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 9, 3:29 AM CDT	Special Weather Statement	ILX	Morgan, Scott	61 min
Apr 9, 3:42 AM CDT	Severe Thunderstorm Warning	ILX	Morgan, Scott	40 min
Apr 9, 3:54 AM CDT	Severe Thunderstorm Warning	ILX	Christian, Sangamon	66 min
Apr 9, 4:44 AM CDT	Areal Flood Advisory	ILX	Christian, Macon, Sangamon	3 hr
Apr 9, 5:26 AM CDT	Special Weather Statement	ILX	Moultrie	49 min
Apr 9, 5:40 AM CDT	Severe Thunderstorm Warning	ILX	Christian	65 min
Apr 9, 5:55 AM CDT	Special Weather Statement	ILX	Effingham	50 min
Apr 9, 7:01 AM CDT	Areal Flood Advisory	ILX	Christian, Effingham, Shelby	3 hr

Nearby

Special Weather Statements in Illinois, 2011 Every special weather statement in 2011

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.