Alert archive / Illinois / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 110, NWS Lincoln, IL

June 11, 1999Sangamon County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jun 11, 1999, 1:55 PM CDT for Sangamon County, Illinois. It was in force for 65 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 11, 1999, 1:55 PM CDT (18:55 UTC)
Expired: Jun 11, 1999, 3:00 PM CDT
In force: 65 min
Issued by: NWS Lincoln, IL
Area: Whole counties

County Sangamon County, IL

The radar

The Lincoln radar (KILX), 52 km from the middle of the area, began a volume at 18:59 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, 6.9 hours before the alert went out and 100 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: 380 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 1398 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Lincoln, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 11, 2:15 AM CDT, 11 hours 40 minutes earlier.

Area forecast discussion, Jun 11, 2:15 AM CDT, 11 hours 40 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
215 AM CDT FRI JUN 11 1999

FORECAST CHALLENGE FOR TODAY IS ONCE AGAIN THE POSSIBILITY
AND AREAL EXTENT OF THUNDERSTORMS THIS AFTERNOON INTO EARLY
TONIGHT. STATIONARY FRONT FROM ERN LAKE SUPERIOR TO SW IA IS
FORECAST TO MOVE LITTLE TODAY INTO SATURDAY. THIS WILL KEEP
VERY WARM AND HUMID AIRMASS IN PLACE ACROSS CENT/SE IL. WITH
FRONT REMAINING TO THE WEST...THE FOCUS FOR CONVECTION WILL
CONTINUE TO BE OLD OUTFLOW BOUNDARIES. THESE BOUNDARIES ARE
DIFFICULT TO PICK OUT THIS TIME OF DAY...BUT GOING BACK
SEVERAL MSAS ANALYSES POINTS TO ONE THAT MAY BE LURKING IN
SRN PARTS OF ILX CWA BTWN HUF/LWV TO ABOUT MVN. COULD BE
ANOTHER IN WCENT IL AS INDICATED BY DIFFERENCE IN LOWEST GATE
WINDS BETWEEN ILX VWP AND WINCHESTER PROFILER.

MODERATE INSTABILITY WITH LI/S AROUND -4 AND CAPES 1500-2000
BY LATE THIS AFTERNOON WILL INTERACT WITH LINGERING BOUNDARIES
TO PRODUCE SCATTERED AFTERNOON THUNDERSTORMS. CURRENT FORECAST
HAS 50 PERCENT POPS...BUT WILL SCALE THESE BACK A BIT IN CENT/SE
IL TO COME MORE IN LINE WITH EXPECTED TRENDS AND NEIGHBORING ZONES.

ETA MODEL ALSO SEEMS TO PICK UP ON A WEAK SHORTWAVE CURRENTLY
FROM ERN KS TO XTRM NW ARK...ACCORDING TO PROFILERS AND WATER
VAPOR LOOP. THIS WEAK UPPER SUPPORT MAY BE ENOUGH TO ALLOW
SOME OF THE SCATTERED PULSE STORMS TO PRODUCE STRONG/SEVERE
WINDS IN WCENT IL LATE THIS AFTERNOON...WHERE SPC HAS A SLIGHT
RISK. HIGH VALUES OF PRECIPITABLE WATER OVER 1.50 INCHES AND
SLOW MOVEMENT OF STORMS WILL PRODUCE LOCALLY HEAVY RAIN. WILL
NEED TO MONITOR INDIVIDUAL STORMS CLOSELY FOR FLASH FLOODING
...BUT NO HEADLINES NEEDED AT THIS TIME.

FWC/FAN TEMPS CLOSE BUT WILL TWEAK UPWARD A BIT FOR THE SAKE
OF PERSISTANCE AND CONSISTENCY.

PRELIMINARY TEMPS/POPS...

SPI BB 90/68 87/67 86 23445
PIA BB 89/67 86/67 85 23545
DEC BB 90/68 87/67 86 23445
CMI BB 90/68 88/67 87 23445
MTO BB 91/69 88/68 87 23445
LWV BB 92/70 89/70 88 23445

MILLER

In the hours before

Local storm report, Jun 11, 11:12 AM CDT, 2 hours 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
1112 AM CDT FRI JUN 11 1999

TIME(CDT)  .....CITY LOCATION..... STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0445 PM    1 S GALESBURG             IL    WIND DAMAGE
06/10/99   KNOX                            NUMEROUS TREE LIMBS
                                           DOWN. POWER POLE DOWN
                                           ONTO A CAR. ESTIMATED
                                           $5000 DAMAGE. REPORT
                                           FROM ESDA.

PLAHMER

Local storm report, Jun 11, 11:12 AM CDT, 2 hours 43 minutes before

PRELIMINARY LOCAL STORM REPORT        ...CORRECT EVENT TIME..
NATIONAL WEATHER SERVICE LINCOLN IL
1112 AM CDT FRI JUN 11 1999

TIME(CDT)  .....CITY LOCATION..... STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0425 PM    1 S GALESBURG             IL    WIND DAMAGE
06/10/99   KNOX                            NUMEROUS TREE LIMBS
                                           DOWN. POWER POLE DOWN
                                           ONTO A CAR. ESTIMATED
                                           $5000 DAMAGE. REPORT
                                           FROM ESDA.

PLAHMER

Special weather statement, Jun 11, 11:30 AM CDT, 2 hours 25 minutes before

ILZ027>031-036>038-040>057-061>063-066>068-071>073-121100-

SEVERE WEATHER OUTLOOK FOR CENTRAL AND SOUTHEAST ILLINOIS
NATIONAL WEATHER SERVICE LINCOLN IL
1130 AM CDT FRI JUN 11 1999

WARM AND HUMID AIR IS FORECAST TO INTERACT WITH AN UPPER
DISTURBANCE APPROACHING FROM THE SOUTHWEST TO PRODUCE
THUNDERSTORMS IN WEST CENTRAL ILLINOIS THIS AFTERNOON INTO
EARLY TONIGHT. SOME OF THE STORMS MAY PRODUCE DAMAGING
WIND GUSTS AND LOCALLY HEAVY RAINFALL ALONG AND WEST OF
THE ILLINOIS RIVER. AS A RESULT...SPOTTER ACTIVATION MAY
BE NEEDED.

THE REMAINDER OF CENTRAL ILLINOIS AND LOCATIONS IN SOUTHEAST
ILLINOIS CAN EXPECT SCATTERED THUNDERSTORMS THIS AFTERNOON
INTO THIS EVENING. A FEW STORMS MAY PRODUCE GUSTY WINDS AND HEAVY
RAINFALL...BUT WIDESPREAD SEVERE WEATHER IS NOT ANTICIPATED IN THESE
AREAS.

Special weather statement, Jun 11, 11:30 AM CDT, 2 hours 25 minutes before

ILZ027>031-036>038-040>057-061>063-066>068-071>073-121100-

SEVERE WEATHER OUTLOOK FOR CENTRAL AND SOUTHEAST ILLINOIS
NATIONAL WEATHER SERVICE LINCOLN IL
1130 AM CDT FRI JUN 11 1999

WARM AND HUMID AIR IS FORECAST TO INTERACT WITH AN UPPER
DISTURBANCE APPROACHING FROM THE SOUTHWEST TO PRODUCE
THUNDERSTORMS IN WEST CENTRAL ILLINOIS THIS AFTERNOON INTO
EARLY TONIGHT. SOME OF THE STORMS MAY PRODUCE DAMAGING
WIND GUSTS AND LOCALLY HEAVY RAINFALL ALONG AND WEST OF
THE ILLINOIS RIVER. AS A RESULT...SPOTTER ACTIVATION MAY
BE NEEDED.

THE REMAINDER OF CENTRAL ILLINOIS AND LOCATIONS IN SOUTHEAST
ILLINOIS CAN EXPECT SCATTERED THUNDERSTORMS THIS AFTERNOON
INTO THIS EVENING. A FEW STORMS MAY PRODUCE GUSTY WINDS AND HEAVY
RAINFALL...BUT WIDESPREAD SEVERE WEATHER IS NOT ANTICIPATED IN THESE
AREAS.

Local storm report, Jun 11, 12:05 PM CDT, 1 hour 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
1205 PM CDT FRI JUN 11 1999

TIME(CDT)  .....CITY LOCATION..... STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0425 PM    1 S GALESBURG             IL    WIND DAMAGE
06/10/99   KNOX                            NUMEROUS TREE LIMBS
                                           DOWN. POWER POLE DOWN
                                           ONTO A CAR. ESTIMATED
                                           $5000 DAMAGE. REPORTED
                                           BY ESDA.

0430 PM    1 N STANFORD              IL    WIND DAMAGE
06/10/99   MCLEAN                          TREE BRANCHES DOWN ON A
                                           HOUSE.  13 POWER POLES
                                           DOWN ON ROUTE 122.
                                           REPORTED BY ESDA.

0540 PM    1 N GOODFIELD             IL    WIND DAMAGE
06/10/99   WOODFORD                        POWER POLES DOWN.
                                           REPORTED BY ESDA.

PLAHMER

Local storm report, Jun 11, 12:05 PM CDT, 1 hour 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
1205 PM CDT FRI JUN 11 1999

TIME(CDT)  .....CITY LOCATION..... STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0425 PM    1 S GALESBURG             IL    WIND DAMAGE
06/10/99   KNOX                            NUMEROUS TREE LIMBS
                                           DOWN. POWER POLE DOWN
                                           ONTO A CAR. ESTIMATED
                                           $5000 DAMAGE. REPORTED
                                           BY ESDA.

0430 PM    1 N STANFORD              IL    WIND DAMAGE
06/10/99   MCLEAN                          TREE BRANCHES DOWN ON A
                                           HOUSE.  13 POWER POLES
                                           DOWN ON ROUTE 122.
                                           REPORTED BY ESDA.

0540 PM    1 N GOODFIELD             IL    WIND DAMAGE
06/10/99   WOODFORD                        POWER POLES DOWN.
                                           REPORTED BY ESDA.

PLAHMER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 10:30 AM CDT	Flash Flood Warning	ILX	Crawford	3 hr
Jun 11, 12:54 PM CDT	Severe Thunderstorm Warning	ILX	Vermilion	36 min
Jun 11, 1:06 PM CDT	Severe Thunderstorm Warning	ILX	Scott	39 min
Jun 11, 1:18 PM CDT	Severe Thunderstorm Warning	ILX	Morgan	57 min
Jun 11, 1:30 PM CDT	Severe Thunderstorm Warning	ILX	Vermilion	45 min
Jun 11, 2:00 PM CDT	Severe Thunderstorm Warning	ILX	Cass	60 min
Jun 11, 2:20 PM CDT	Severe Thunderstorm Warning	ILX	Mason, Schuyler	55 min
Jun 11, 2:34 PM CDT	Severe Thunderstorm Warning	ILX	Fulton	71 min
Jun 11, 2:43 PM CDT	Severe Thunderstorm Warning	ILX	Shelby	62 min
Jun 11, 2:54 PM CDT	Severe Thunderstorm Warning	ILX	Macon	36 min
Jun 11, 3:05 PM CDT	Severe Thunderstorm Warning	ILX	Christian	40 min
Jun 11, 3:19 PM CDT	Severe Thunderstorm Warning	ILX	Woodford	41 min
Jun 11, 3:26 PM CDT	Severe Thunderstorm Warning	ILX	Piatt	49 min
Jun 11, 3:31 PM CDT	Severe Thunderstorm Warning	ILX	McLean	44 min
Jun 11, 4:06 PM CDT	Severe Thunderstorm Warning	ILX	Woodford	24 min
Jun 11, 4:11 PM CDT	Severe Thunderstorm Warning	ILX	McLean	34 min
Jun 11, 4:30 PM CDT	Severe Thunderstorm Warning	ILX	Woodford	30 min
Jun 11, 4:49 PM CDT	Severe Thunderstorm Warning	ILX	Marshall	41 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1999 Every severe thunderstorm warning in 1999

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.