Alert archive / Illinois / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 1, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Mar 8, 2000, 4:51 PM CST for Boone County, Winnebago County, Illinois. It was in force for 39 min. 1 report came from inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.
The facts
- Issued
- Mar 8, 2000, 4:51 PM CST (22:51 UTC)
- Expired
- Mar 8, 2000, 5:30 PM CST
- In force
- 39 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Boone County, IL, Winnebago County, IL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Mar 8, 5:10 PM CST | Hail 0.75 | Rockford, IL |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Mar 8, 2:30 PM CST | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 10.9 hours before the alert went out and 143 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1748 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 230 m²/s²
- 0-3 km storm-relative helicity
- 238 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KLOT 082255 SVRCHI ILC007-201-082330- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHICAGO IL 451 PM CST WED MAR 8 2000 THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHWEST BOONE COUNTY IN NORTH CENTRAL ILLINOIS EASTERN WINNEBAGO COUNTY IN NORTH CENTRAL ILLINOIS * UNTIL 530 PM CST * AT 451 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 11 MILES SOUTH OF WINNEBAGO...OR ABOUT 9 MILES NORTHEAST OF OREGON...MOVING NORTHEAST AT 50 MPH. * THE SEVERE THUNDERSTORM WILL BE 7 MILES SOUTHEAST OF WINNEBAGO AROUND 500 PM CST... NEAR ROCKFORD AROUND 505 PM CST... NEAR LOVES PARK AROUND 510 PM CST... NEAR ROCKTON AROUND 515 PM CST... NEAR SOUTH BELOIT AROUND 520 PM CST... THE SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING HAIL UP TO THE SIZE OF NICKELS... DAMAGING WINDS GREATER THAN 60 MILES AN HOUR... A LTORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. LAT...LON 4220 8929 4214 8901 4253 8875 4263 8902 ALLSOPP
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 Mar 8, 3:00 PM CST, 1 hour 51 minutes earlier.
Area forecast discussion, Mar 8, 3:00 PM CST, 1 hour 51 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO IL 3 PM CST WED MAR 8 2000 SHORT TERM CHALLENGE IS WITH SEVERE WEATHER POSSIBLITIES. LIMITED DEEP MOISTURE AND SURFACE CONVERGENCE...TOGETHER WITH ONLY WEAK DIVERGENCE ALOFT AS MAIN JET STREAK WELL TO THE SOUTH...MAY LEAD TO ONLY ISOLATED THUNDERSTORMS THIS AFTERNOON INTO EARLY EVENING. CIRCULATION AROUND DEEP LOW WILL DRAW DOWN SHARPLY COLDER AIR BY LATE THURSDAY AFTERNOON...WITH TEMPS LIKELY FALLING ALL DAY. CLOUDS WILL LIKELY LINGER THROUGH FRIDAY. SHALLOW MOISTURE DOES NOT EXTEND INTO ANY LAYER BELOW MINUS 10C...SO THINK LIGHT SNOW UNLIKELY. SNOW CHANCES SATURDAY APPEAR DIMINISHED WITH LATEST AVN RUN...AS SURFACE LOW TRACKS FARTHER SOUTH. .CHI...TORNADO WATCH ALL IL ZONES UNTIL 8 PM. BROWNING
In the hours before
Special weather statement, Mar 8, 11:00 AM CST, 5 hours 51 minutes before
ILZ003>006-008-010>014-019>023-032>033-039-INZ001>002-010>011-019- 091200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO IL 1100 AM CST/1200 PM EST WED MAR 8 2000 FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON IN NORTH CENTRAL ILLINOIS. AN APPROACHING COLD FRONT WILL TRIGGER WIDELY SCATTERED TO ISOLATED THUNDERSTORMS ACROSS NORTHERN ILLINOIS THIS AFTERNOON. NEAR RECORD WARMTH AHEAD OF THE FRONT WILL YIELD UNSTABLE CONDITIONS WHICH COULD TRIGGER ISOLATED SEVERE THUNDERSTORMS ACROSS NORTH CENTRAL ILLINOIS. HOWEVER...VERY LIMITED MOISTURE AND WEAK DYNAMICS...OR LIFT...WILL INHIBIT WIDESPREAD SEVERE WEATHER. BROWNING
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 8, 5:03 PM CST | Severe Thunderstorm Warning | LOT | Ogle, Winnebago | 57 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2000Every severe thunderstorm warning in 2000
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.