Alert archive / Iowa / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 62, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at May 20, 1998, 11:45 AM CDT for Jefferson County, Van Buren County, Iowa. It was in force for 35 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- May 20, 1998, 11:45 AM CDT (16:45 UTC)
- Expired
- May 20, 1998, 12:20 PM CDT
- In force
- 35 min
- Issued by
- NWS Quad Cities, IA
- Area
- Whole counties
Counties Jefferson County, IA, Van Buren County, IA
The radar
The Quad Cities radar (KDVN), 140 km from the middle of the area, began a volume at 16:47 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 20, 12:08 PM CDT | Hail 1.5 | Utica, IA | |
| May 20, 12:08 PM CDT | Hail 1.5 | Utica, IA |
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 nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 4.8 hours before the alert went out and 146 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
- 2431 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 176 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
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 Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 20, 1:53 AM CDT, 9 hours 52 minutes earlier.
Area forecast discussion, May 20, 1:53 AM CDT, 9 hours 52 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 153 AM CDT WED MAY 20 1998 INSTABILITY IN VCNTY OF STATIONARY FNT FM NRN MO INTO CNTRL IL WARRANTS CHC POPS FOR SRN TWO ROWS OF COUNTIES TODAY. WK HI PRES NOSING IN FM DAKOTAS SHOULD KEEP RMNDR OF FA DRY. NO SHORTAGE OF MID AND HIGH LEVEL CLOUDINESS AS STEERING WNDS ADVECT CONVECTIVE DEBRIS EWRD. NE WNDS AT SFC TO SLOWLY CHIP AWAY AT LOW LEVEL MOISTURE THROUGHOUT DAY... PROVIDING RELIEF FM THE STICKY CONDITIONS OF LT... ESP NORTH OF I-80. CID 79/00 DBQ 78/00 MLI 83/10 BRL 81/30 TPH
In the hours before
Local storm report, May 20, 9:17 AM CDT, 2 hours 28 minutes before
PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 917 AM CDT WED MAY 20 1998 TIME(CDT) .....CITY LOCATION..... ST ...EVENT/REMARKS... DATE(CDT) ....COUNTY LOCATION.... 0845 AM KEOKUK IA 61 MPH WIND GUST 05/20/98 LEE REPORTED BY AWOS
Local storm report, May 20, 9:17 AM CDT, 2 hours 28 minutes before
PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 917 AM CDT WED MAY 20 1998 TIME(CDT) .....CITY LOCATION..... ST ...EVENT/REMARKS... DATE(CDT) ....COUNTY LOCATION.... 0845 AM KEOKUK IA 61 MPH WIND GUST 05/20/98 LEE REPORTED BY AWOS
Local storm report, May 20, 9:22 AM CDT, 2 hours 23 minutes before
PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 922 AM CDT WED MAY 20 1998 TIME(CDT) .....CITY LOCATION..... ST ...EVENT/REMARKS... DATE(CDT) ....COUNTY LOCATION.... 0845 AM KEOKUK IA 1.00 INCH HAIL 05/20/98 LEE
Local storm report, May 20, 9:22 AM CDT, 2 hours 23 minutes before
PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 922 AM CDT WED MAY 20 1998 TIME(CDT) .....CITY LOCATION..... ST ...EVENT/REMARKS... DATE(CDT) ....COUNTY LOCATION.... 0845 AM KEOKUK IA 1.00 INCH HAIL 05/20/98 LEE
Local storm report, May 20, 9:38 AM CDT, 2 hours 7 minutes before
PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 938 AM CDT WED MAY 20 1998 TIME(CDT) .....CITY LOCATION..... ST ...EVENT/REMARKS... DATE(CDT) ....COUNTY LOCATION.... 0855 AM WARSAW IL WIND DAMAGE 05/20/98 HANCOCK TREES DOWN
Local storm report, May 20, 9:38 AM CDT, 2 hours 7 minutes before
PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 938 AM CDT WED MAY 20 1998 TIME(CDT) .....CITY LOCATION..... ST ...EVENT/REMARKS... DATE(CDT) ....COUNTY LOCATION.... 0855 AM WARSAW IL WIND DAMAGE 05/20/98 HANCOCK TREES DOWN
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 8:50 AM CDT | Severe Thunderstorm Warning | DVN | Lee | 45 min |
| May 20, 11:51 AM CDT | Severe Thunderstorm Warning | DVN | Keokuk | 34 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1998Every severe thunderstorm warning in 1998
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; radar from the NEXRAD Level II archive.