Alert archive / Illinois / Special Weather Statements in 2012
Special Weather Statement, NWS Lincoln, IL
NWS Lincoln, IL issued this special weather statement at May 7, 2012, 3:41 AM CDT for Champaign County, Piatt County, Illinois. It was in force for 64 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
- May 7, 2012, 3:41 AM CDT (08:41 UTC)
- Expired
- May 7, 2012, 4:45 AM CDT
- In force
- 64 min
- Issued by
- NWS Lincoln, IL
Counties Champaign County, IL, Piatt County, IL
The radar
The Lincoln radar (KILX), 80 km from the middle of the area, began a volume at 08:43 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, 8.7 hours before the alert went out and 20 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.
- Mixed-layer CAPE
- 1208 J/kg
- Mixed-layer CIN
- -88 J/kg
- Mixed-layer LCL
- 1947 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>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 May 6, 6:12 PM CDT, 9 hours 29 minutes earlier.
Area forecast discussion, May 6, 6:12 PM CDT, 9 hours 29 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LINCOLN IL 612 PM CDT SUN MAY 6 2012 .DISCUSSION... ISSUED 323 PM CDT SUN MAY 6 2012 SHORT TERM...TONIGHT THROUGH TUESDAY THUNDERSTORMS WILL CONTINUE TO INITIATE ALONG/AHEAD OF AN OUTFLOW BOUNDARY ACROSS THE ILLINOIS RIVER VALLEY THIS AFTERNOON...THEN AHEAD OF AN ADVANCING COLD FRONT TONIGHT. WITH VERY HIGH CAPE VALUES IN EXCESS OF 4000J/KG NOTED ON THE 18Z KILX SOUNDING...ANY STORMS THAT FIRE LATE THIS AFTERNOON AND EVENING WILL BE CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING WIND GUSTS. SHEAR PARAMETERS REMAIN MARGINAL ACROSS MUCH OF THE AREA...BUT ARE A BIT MORE ROBUST FURTHER NORTH ACROSS THE FAR NORTHERN CWA IN CLOSER PROXIMITY TO SYNOPTIC FRONT DRAPED ACROSS NORTH-CENTRAL ILLINOIS. ISOLATED TORNADO THREAT WILL EXIST NEAR THE FRONT NORTH OF I-74 FOR THE NEXT FEW HOURS. AS LOW-LEVEL JET STRENGTHENS LATER THIS EVENING INTO THE OVERNIGHT HOURS...SHOWERS AND THUNDERSTORMS WILL BECOME WIDESPREAD ACROSS THE AREA...WITH THE BEST FOCUS FOR CONVECTION NORTH OF I-70. LOCALLY HEAVY RAINFALL WILL BE POSSIBLE...ESPECIALLY CLOSE TO THE FRONTAL BOUNDARY ACROSS THE NORTHERN CWA. DUE TO THE RECENT DRY CONDITIONS...FLASH FLOOD GUIDANCE REMAINS RATHER HIGH SO DO NOT THINK FLASH FLOOD RISK IS GREAT ENOUGH TO ISSUE A WATCH AT THIS TIME. WILL CARRY CATEGORICAL POPS ACROSS ALL BUT THE FAR SOUTHEAST TONIGHT. SURFACE LOW PRESSURE WILL APPROACH FROM THE WEST LATER TONIGHT...THEN TRACK ACROSS CENTRAL ILLINOIS ON MONDAY. STILL SOME DISAGREEMENT AMONG THE MODELS CONCERNING SPEED OF SYSTEM...WITH THE GFS LAGGING BEHIND THE NAM BY ABOUT 6 TO 12 HOURS. AS SUCH...WILL FEATURE LIKELY POPS ACROSS THE BOARD IN THE MORNING...THEN INTO THE AFTERNOON HOURS ACROSS EAST-CENTRAL AND SOUTHEAST ILLINOIS. SEVERE THREAT WILL EXIST ALONG THE TRAILING COLD FRONT MONDAY AFTERNOON...PARTICULARLY ACROSS THE E/SE CWA. WILL LINGER CHANCE POPS INTO THE EVENING EAST OF I-57...THEN WILL GO DRY EVERYWHERE OVERNIGHT. LONG TERM...WEDNESDAY THROUGH SATURDAY COOLER/DRIER WEATHER WILL ARRIVE ON TUESDAY AND WEDNESDAY...WITH A SLIGHT CHANCE FOR SHOWERS ACROSS THE N/NE CWA ON WEDNESDAY AS AN UPPER-LEVEL TROUGH DIGS SOUTHWARD INTO THE GREAT LAKES AND OHIO RIVER VALLEY. AFTER THAT...TEMPS WILL MODERATE THROUGH THE WEEK...WITH THE NEXT CHANCE FOR RAIN HOLDING OFF UNTIL THE WEEKEND WHEN A WEAK COLD FRONT DROPS INTO THE REGION. && .AVIATION... ISSUED 612 PM CDT SUN MAY 6 2012 CHALLENGING CONVECTIVE TRENDS WILL DOMINATE AT LEAST THE FIRST HALF OF THIS TAF FORECAST. INITIALLY...A STRONG OUTFLOW BOUNDARY FROM CONVECTION NORTH OF I-74 IS TRACKING SOUTH...REACHING CHAMPAIGN BY 2330Z. IMMEDIATELY BEHIND THE BOUNDARY NORTH WINDS HAVE BEEN GUSTING TO 40 KTS. AFTER THE BOUNDARY PUSHES SOUTH WINDS SWITCH TO THE EAST AT 20 TO 30 KTS. THIS BOUNDARY MAY NOT REACH AS FAR SOUTH AS KDEC AND HAVE NOT INCLUDED IN THE TAF. ADDITIONAL CONVECTIVE DEVELOPMENT IS EXPECTED DURING THE MID EVENING OVER WESTERN ILLINOIS IN A ZONE OF MOISTURE CONVERGENCE AHEAD OF A SURFACE FRONT. PERIODS OF THUNDERSTORMS ARE POSSIBLE OVERNIGHT AHEAD OF THIS BOUNDARY. WIND GUSTS IN/NEAR ANY STORMS COULD EASILY GUST TO 40 KTS. DUE TO LOCATION AND TIMING UNCERTAINTY HAVE ONLY INCLUDED VCTS AT THIS TIME. THE COLD FRONT WILL WORK FROM WEST TO EAST ACROSS THE TAF SITES FROM 10-15Z MONDAY. BEHIND THE FRONT WINDS SHIFT TO THE NW AROUND 10 KTS. FORECAST SOUNDINGS SHOW LOWER CEILINGS AROUND 2000-2500 FT AGL BEHIND THE FRONT. WITH ELEVATED INSTABILITY REMAINING BEHIND THE FRONT...KEPT THUNDER MENTION IN EASTERN SITES THROUGH 18Z. 25 && .ILX WATCHES/WARNINGS/ADVISORIES... NONE. &&
Hazardous weather outlook, May 6, 3:32 PM CDT, 12 hours 9 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LINCOLN IL 332 PM CDT SUN MAY 6 2012 ILZ027>031-036>038-040>051-053-071100- CASS-CHAMPAIGN-DE WITT-FULTON-KNOX-LOGAN-MACON-MARSHALL-MASON- MCLEAN-MENARD-MORGAN-PEORIA-PIATT-SANGAMON-SCHUYLER-SCOTT-STARK- TAZEWELL-VERMILION-WOODFORD- 332 PM CDT SUN MAY 6 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL ILLINOIS AND EAST CENTRAL ILLINOIS. .DAY ONE...TONIGHT A WARM FRONT IN THE VICINITY THIS EVENING AND AN APPROACHING COLD FRONT LATER TONIGHT WILL SET THE STAGE FOR PERIODIC THUNDERSTORMS. THE PRIMARY SEVERE WEATHER THREAT IS EXPECTED THIS EVENING. LARGE HAIL...DAMAGING WIND GUSTS...AND LOCALLY HEAVY RAINFALL WILL BE POSSIBLE. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THE COLD FRONT WILL PUSH EASTWARD ACROSS ILLINOIS ON MONDAY...WITH SOME THUNDERSTORMS POSSIBLE DURING THE MORNING HOURS. THUNDERSTORM CHANCES WILL RETURN AGAIN NEXT SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING...PRIMARILY BETWEEN 4 PM AND 8 PM WEST OF INTERSTATE 55...AND BETWEEN 8 PM AND MIDNIGHT EAST OF INTERSTATE 55. ILZ052-054>057-061>063-066>068-071>073-071100- CHRISTIAN-CLARK-CLAY-COLES-CRAWFORD-CUMBERLAND-DOUGLAS-EDGAR- EFFINGHAM-JASPER-LAWRENCE-MOULTRIE-RICHLAND-SHELBY- 332 PM CDT SUN MAY 6 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL ILLINOIS...EAST CENTRAL ILLINOIS AND SOUTHEAST ILLINOIS. .DAY ONE...TONIGHT A WARM FRONT IN THE VICINITY THIS EVENING AND AN APPROACHING COLD FRONT LATER TONIGHT WILL SET THE STAGE FOR PERIODIC THUNDERSTORMS. LARGE HAIL...DAMAGING WIND GUSTS...AND LOCALLY HEAVY RAINFALL WILL BE POSSIBLE WITH THE STRONGEST STORMS. THROUGH TONIGHT...SEVERE WEATHER SHOULD REMAIN PRIMARILY WEST OF INTERSTATE 57. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THE COLD FRONT WILL PUSH SLOWLY EASTWARD ACROSS ILLINOIS ON MONDAY...BRINGING THE THREAT FOR MORE THUNDERSTORMS...PRIMARILY DURING THE MORNING HOURS. SEVERE STORMS ON MONDAY SHOULD BE CONFINED TO AREAS MAINLY SOUTHEAST OF INTERSTATE 70. THUNDERSTORM CHANCES WILL RETURN AGAIN NEXT SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED BETWEEN 8 PM AND MIDNIGHT THIS EVENING. BAK
The office that day
Everything else NWS Lincoln, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 10:52 PM CDT | Special Weather Statement | ILX | Marshall | 53 min |
| May 6, 11:37 PM CDT | Special Weather Statement | ILX | Woodford | 23 min |
Nearby
Special Weather Statements in Illinois, 2012Every special weather statement in 2012
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.