Alert archive / Illinois / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 28, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Aug 19, 2002, 1:10 AM CDT for Ford County, Illinois. It was in force for 55 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
- Aug 19, 2002, 1:10 AM CDT (06:10 UTC)
- Expired
- Aug 19, 2002, 2:05 AM CDT
- In force
- 55 min
- Issued by
- NWS Chicago, IL
- Area
- Counties, with a storm outline in the text
County Ford County, IL
The radar
The Lincoln radar (KILX), 87 km from the middle of the area, began a volume at 06:12 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 6.2 hours before the alert went out and 45 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
- 523 J/kg
- Mixed-layer CIN
- -272 J/kg
- Mixed-layer LCL
- 743 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 172 m²/s²
- 0-3 km storm-relative helicity
- 282 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
133 WUUS53 KLOT 190610 SVRCHI ILC053-190705- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHICAGO IL 107 AM CDT MON AUG 19 2002 THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... FORD COUNTY IN EAST CENTRAL ILLINOIS * UNTIL 205 AM CDT * AT 105 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 17 MILES WEST OF GIBSON CITY...MOVING EAST AT 35 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... GIBSON CITY AROUND 130 AM CDT. THE SEVERE THUNDERSTORMS ARE CAPABLE OF PRODUCING HAIL UP TO THE SIZE OF QUARTERS. VERY HEAVY RAINFALL...WHICH MAY CAUSE LOCALIZED FLOODING. GET INDOORS AND STAY AWAY FROM WINDOWS. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE. LAT...LON 4060 8865 4046 8865 4042 8814 4060 8814 BRUMER NNNN
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 Chicago, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 18, 2:05 PM CDT, 11 hours 5 minutes earlier.
Area forecast discussion, Aug 18, 2:05 PM CDT, 11 hours 5 minutes before
AREA GRIDDED FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO IL 205 PM CDT SUN AUG 18 2002 VAPOR IMAGERY SUPPORTING A STRONG VORT CROSSING INTO WESTERN DAKOTAS FORECAST TO TRACK ACROSS WISCONSIN TONIGHT. THUS LATEST AVN/ETA RUNS HAVE ABOUT AS MUCH LIFT IN NORTHERN PART OF CWFA DURING THE NIGHT AS TO THE SOUTH. SO MOS BLEND YIELDING LIKELY POPS EVEN FAR NORTH IS ACCEPTABLE. MORE OF THIS LIFT WILL PROBABLY NEED TO GO INTO SATURATION WHICH MAY DELAY ONSET OF PRECIP A BIT. GOES SOUNDER DATA, WHERE NOT OBSCURED BY CLOUDS, STILL SHOWING BEST PWS APPROACHING 2 BOTTLED UP OVER SOUTHERN KANSAS. AS DISCUSSED EARLIER, HEAVY RAIN THREAT (TREAT?) SUCH AS IT IS, APPEARS CONFINED TO SOUTHERN COUNTIES. AND IN AMOUNTS EXPECTED TO FALL, IT SHOULD BE VERY WELCOME. LINGERING MORNING SHOWERS A THREAT OVER ALL BUT FAR NORTHWEST COUNTIES. ETA SLOWER TO DRY THINGS OUT BUT WILL GO WITH FASTER AVN/NGM SOLUTION THAT SHOULD YIELD ABUNDANT SUNSHINE BY AFTERNOON IN THE NORTHWEST HALF OF THE CWFA. ETA/AVN/NGM MOS BLEND GENERALLY USED FOR TEMPS. DELIGHTFUL DAY EXPECTED TUESDAY BEFORE RETURN SOUTHERLY FLOW BEGINS. TUESDAY NIGHT INTO WEDNESDAY PRIMARY FOCUS OF 850 JET IS NORTHWARD THROUGH THE PLAINS AND INTO UPPER MIDWEST. SUPPOSE SOME OF THIS DECAYING ACTIVITY COULD BLEED SOUTHEAST ALONG THICKNESS CONTOURS INTO OUR NORTHERN COUNTIES, BUT FOR NOW WILL STICK WITH GOING DRY FORECAST. LATEST AVN RUN IN AGREEMENT WITH EARLIER HPC GUIDANCE AND GOING FORECAST ON A SMALL THREAT OF PRECIP EARLY ON THURSDAY NORTHERN CWA. PERHAPS AIDED BY A BOUNDARY LEFTOVER FROM THE DAY BEFORE. OTHERWISE FOR DAYS 4-7 MADE SMALL, MOSTLY UPWARD CHANGES TO HPC TEMP GUIDANCE TO BLEND TOWARD PREVIOUS LOCAL FORECAST. PRECIP GUIDANCE ACCEPTED. .CHI...NONE KAPLAN
In the hours before
Local storm report, Aug 18, 7:40 PM CDT, 5 hours 30 minutes before
PRELIMINARY LOCAL STORM REPORT TEST TEST TEST TEST
NATIONAL WEATHER SERVICE CHICAGO IL
740 PM CDT SUN AUG 18 2002
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0740 PM TEST IN TEST
08/18/02 TEST TEST
TEST TEST TEST TEST TEST TESTThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 2:12 AM CDT | Flash Flood Warning | LOT | Ford, Iroquois | 4 hr |
| Aug 19, 6:12 AM CDT | Flash Flood Warning | LOT | Ford, Iroquois | 3 hr |
Nearby
Severe Thunderstorm Warnings in Illinois, 2002Every severe thunderstorm warning in 2002
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.