Alert archive / Illinois / Severe Thunderstorm Warnings in 1989
Severe Thunderstorm Warning 36, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 4, 1989, 9:05 PM CDT for Whiteside County, Illinois. It was in force for 15 min.
The area
The counties it named.
The facts
- Issued
- Aug 4, 1989, 9:05 PM CDT (02:05 UTC)
- Expired
- Aug 4, 1989, 9:20 PM CDT
- In force
- 15 min
- Issued by
- NWS Quad Cities, IA
- Area
- Whole counties
County Whiteside County, IL
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Peoria Regional, IL (KPIA), launched 00:00Z, 2.1 hours before the alert went out and 124 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
- 3854 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 1122 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 72 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.5
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.
In the hours before
Special weather statement, Aug 4, 8:43 PM CDT, 22 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DUBUQUE IA 843 PM CDT FRI AUG 4 1989 ...SEVERE THUNDERSTORM WATCH UNTIL 1100 PM CDT... AT 840 PM CDT WEATHER RADAR SHOWED THAT THE FIRST ROUND OF SEVERE THUNDERSTORMS HAD MOVED SOUTHEAST AND OUT OF THE TRI-STATE AREA. HOWEVER...ANOTHER AREA OF STRONG THUNDERSTORMS WAS MOVING TOWARD THE NORTHWEST PART OF THE TRI-STATE AREA AND WILL MOVE INTO NORTHERN GRANT AND NORTHERN CLAYTON COUNTIES BY 845 PM CDT. THESE STRONG THUNDERSTORMS ARE PRODUCING LARGE HAIL...DAMAGING WIND DANGEROUS LIGHTNING...AND VERY HEAVY RAIN. PERSONS IN NORTHERN GRANT AND CLAYTON COUNTIES SHOULD REMAIN ALERT FOR CHANGING WEATHER CONDITIONS AND SEEK INDOOR SHELTER IF SEVERE WEATHER APPROACHES. COUCH
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 7:03 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque | 57 min |
| Aug 4, 7:33 PM CDT | Severe Thunderstorm Warning | DVN | Jackson | 27 min |
| Aug 4, 9:10 PM CDT | Severe Thunderstorm Warning | DVN | Clayton | 65 min |
| Aug 4, 11:26 PM CDT | Severe Thunderstorm Warning | DVN | Delaware | 34 min |
| Aug 5, 11:07 AM CDT | Severe Thunderstorm Warning | DVN | Cedar, Louisa, Muscatine | 68 min |
| Aug 5, 11:09 AM CDT | Severe Thunderstorm Warning | DVN | Jones | 66 min |
| Aug 5, 11:43 AM CDT | Severe Thunderstorm Warning | DVN | Jackson | 32 min |
| Aug 5, 11:44 AM CDT | Severe Thunderstorm Warning | DVN | Clinton, Scott | 46 min |
| Aug 5, 11:44 AM CDT | Severe Thunderstorm Warning | DVN | Muscatine | 46 min |
| Aug 4, 10:45 PM CDT | Severe Thunderstorm Warning | DVN | Lafayette | 20 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 1989Every severe thunderstorm warning in 1989
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.