Alert archive / Illinois / Severe Thunderstorm Warnings in 2004
Severe Thunderstorm Warning 86, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at May 31, 2004, 6:00 PM CDT for Rock Island County, Illinois; Scott County, Iowa. It was in force for 30 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 31, 2004, 6:00 PM CDT (23:00 UTC)
- Expired
- May 31, 2004, 6:30 PM CDT
- In force
- 30 min
- Issued by
- NWS Quad Cities, IA
- Area
- Counties, with a storm outline in the text
Counties Scott County, IA, Rock Island County, IL
The radar
The Quad Cities radar (KDVN), 14 km from the middle of the area, began a volume at 23:01 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 31, 6:00 PM CDT | HAIL 0.75 | 4 Sw Davenport, IA | NEAR I280 AND 22. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 12:00Z, 11.0 hours before the alert went out and 219 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
- 1188 m above ground
- 0-6 km bulk shear
- 77 kt
- 0-1 km storm-relative helicity
- -23 m²/s²
- 0-3 km storm-relative helicity
- 15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS53 KDVN 312300
SVRDVN
IAC163-ILC161-312330-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
600 PM CDT MON MAY 31 2004
THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN SCOTT COUNTY IN EAST CENTRAL IOWA
CENTRAL ROCK ISLAND COUNTY IN NORTHWEST ILLINOIS
* UNTIL 630 PM CDT
* AT 556 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
BUFFALO...OR ABOUT OVER ROCK ISLAND...AND MOVING EAST AT 40 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
MILAN BY 605 PM CDT
MOLINE...RIVERDALE...COAL VALLEY AND BETTENDORF BY 610 PM CDT
SILVIS HEIGHTS...SILVIS...EAST MOLINE AND HAMPTON BY 615 PM CDT
THIS IS A DANGEROUS STORM. MOVE IMMEDIATELY INDOORS AND STAY AWAY
FROM WINDOWS.
LAT...LON 4154 9034 4146 9045 4137 9045 4143 9076
4160 9074 4161 9031
$$
DLFWhat 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 31, 3:17 PM CDT, 2 hours 43 minutes earlier.
Area forecast discussion, May 31, 3:17 PM CDT, 2 hours 43 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 317 PM CDT MON MAY 31 2004 .SYNOPSIS... UPPER LOW WAS LOCATED OVER SRN MN THIS MORNING WITH ANOTHER LOW OVER SRN SASKATCHEWAN POISED TO DROP SOUTH BY TUESDAY. COLD AIR ASSOCIATED WITH THE SYSTEM HAS CREATED A MODERATELY UNSTABLE ATMOSPHERE...WITH NUMEROUS TSRA POPPING UP SINCE NOON AS CONVECTIVE TEMPS AROUND 70 WERE REACHED. THE STORMS THAT DEVELOPED AROUND NOON OVER THE NW CWA OCCURRED JUST AHEAD OF A WEAK IMPULSE APPARENT ON THE WATER VAPOR IMAGERY MOVING THROUGH WRN IA. OTHER TSRA DEVELOPED ON THE COLD SIDE OF THE H3 JET FROM ERN NE THROUGH SRN IA AROUND MID AFTERNOON. WITH WBZS AROUND 7KFT...CELLS WERE HAVING NO TROUBLE SPITTING OUT SOME PEA SIZE HAIL AT TIMES. && .SHORT TERM (TONIGHT AND TUESDAY)... MAIN FORECAST CONCERN IN THE SHORT TERM WILL BE PCPN TRENDS AS COLD UPPER SYSTEM DIGS SOUTH TOWARD IA TONIGHT AND TUESDAY. SINCE SOLAR HEATING HAS PLAYED A LARGE PART IN THIS AFTERNOONS TSRA DEVELOPMENT...WOULD EXPECT CONVECTION TO DECREASE RAPIDLY AFTER 7 OR 8 PM WITH LOSS OF HEATING. MOST OF CWA SHOULD REMAIN DRY OVERNIGHT WITH THE EXCEPTION OF THE FAR NORTH. WE WILL MAINTAIN THE SLIGHT CHANCE WORDING IN THE NORTH WHERE PCPN SHIELD NEAR UPPER SYSTEM COULD MOVE IN BY LATE TONIGHT. FOR TUESDAY EXPECT A REPEAT OF TODAY WITH SHRA DEVELOPING BY LATE MORNING AS H5 COLD POOL MOVES THROUGH ENHANCING LAPSE RATES OVER THE AREA. THERE WILL BE MORE CLOUDS THAN TODAY WITH MODELS SHOWING INCREASING RH FROM NORTH TO SOUTH. HOWEVER...WITH JUST A LITTLE SUN...THE ATMOSPHERE COULD DESTABALIZE ENOUGH TO SUPPORT THUNDERSTORMS. ...DLF... .LONG TERM...(TUESDAY NIGHT THROUGH MONDAY) THIS PERIOD WILL BE DOMINATED BY THE SLOW MOVING UPPER LOW PRESSURE SYSTEM THROUGH EARLY THURSDAY...THEN FOCUS SHIFTS TO A MORE SEASONAL BUT ACTIVE ZONAL/SOUTHWEST FLOW REGIME TOWARD THE WEEKEND. WITH THE MAIN UPPER LOW IN THE AREA TUESDAY EVENING...SHOWERS AND A FEW THUNDERSTORMS WILL BE ABLE TO PERSIST INTO EARLY EVENING...BEFORE DISSIPATING TO ISOLATED SHOWERS AFTER DARK. WEDNESDAY...THE UPPER SYSTEM CONTINUES TO BE OVERHEAD...WITH VERY COLD AIR ALOFT. HOWEVER...BY THEN...COOL AIR WILL BE ENTRENCHED OVER THE CWA AND CLOUD COVER IS EXPECTED TO BE MORE WIDESPREAD. THIS WILL LIMIT INSTABILITY...THUS ONLY SHOWERS AND A VERY ISOLATED LIGHTNING STRIKE OR TWO SHOULD DEVELOP DURING THE DAY. IN ALL...THIS PRECIP WILL BE RATHER LIGHT IN GENERAL...BUT ISOLATED AMOUNTS AROUND A QUARTER INCH MAY OCCUR WEDNESDAY. TEMPS WILL BE COOL FOR HIGHS WEDNESDAY...WITH MID/UPPER 60S AREA WIDE. THURSDAY AND FRIDAY WILL SEE COOL HIGH PRESSURE AND MORE SEASONAL TEMPS. HIGHS BACK INTO THE MID 70S WITH LIGHTER WINDS WILL MAKE FOR A FEW REALLY PLEASANT DAYS. THE UNSETTLED WEATHER RETURNS SATURDAY AS THE UPPER FLOW BECOMES ZONAL...AND MOISTURE RETURNS. MCS POTENTIAL WILL BEGIN SATURDAY NIGHT...AND LINGER SEVERAL DAYS AS ANOTHER WEST TO EAST FRONT LINGERS THROUGH THE REGION. MOST 00Z MODELS AGREED WITH THIS SOLUTION. HAVE GONE BELOW CLIMO ON TEMPS GIVEN POTENTIAL FOR CLOUDS AND PRECIP SUN-MON. ...ERVIN... && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. &&
Hazardous weather outlook, May 31, 5:00 AM CDT, 13 hours before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 500 AM CDT MON MAY 31 2004 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-011000- BENTON IA-BUCHANAN IA-BUREAU IL-CARROLL IL-CEDAR IA-CLARK MO- CLINTON IA-DELAWARE IA-DES MOINES IA-DUBUQUE IA-HANCOCK IL- HENDERSON IL-HENRY IA-HENRY IL-IOWA IA-JACKSON IA-JEFFERSON IA- JO DAVIESS IL-JOHNSON IA-JONES IA-KEOKUK IA-LEE IA-LINN IA-LOUISA IA- MCDONOUGH IL-MERCER IL-MUSCATINE IA-PUTNAM IL-ROCK ISLAND IL- SCOTLAND MO-SCOTT IA-STEPHENSON IL-VAN BUREN IA-WARREN IL- WASHINGTON IA-WHITESIDE IL- 500 AM CDT MON MAY 31 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST IOWA... EAST CENTRAL IOWA...SOUTHEAST IOWA...NORTHWEST ILLINOIS...NORTH CENTRAL ILLINOIS...WEST CENTRAL ILLINOIS AND NORTHEAST MISSOURI. .DAY ONE...TODAY AND TONIGHT EARLY MORNING SHOWERS AND THUNDERSTORMS WILL END BY MID MORNING AS AN UPPER LEVEL DISTURBANCE EXITS THE AREA. THUNDERSTORMS ARE EXPECTED TO REDEVELOP THIS AFTERNOON AND EVENING AS ANOTHER UPPER LEVEL DISTURBANCE MOVES INTO THE AREA. DUE TO COLD AIR ALOFT... STORMS THAT DEVELOP THIS AFTERNOON AND EVENING WILL HAVE A HIGH PROBABILITY OF PRODUCING HAIL. SEVERE STORMS ARE POSSIBLE DUE TO STRONG WINDS ALOFT. THE MOST LIKELY TIME PERIOD IS FROM 2 PM TO 9 PM...WITH THE PRIMARY THREATS BEING HAIL AND DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH NEXT MONDAY AN UNSETTLED PERIOD OF WEATHER IS EXPECTED TUESDAY THROUGH WEDNESDAY NIGHT AS SEVERAL UPPER AIR DISTURBANCES ROTATE AROUND AN UPPER LOW. THIS WILL RESULT IN MAINLY AFTERNOON AND EVENING SHOWERS BUT THUNDERSTORMS COULD ALSO DEVELOP. ON WEDNESDAY THE UPPER LOW IS FORECAST TO MOVE ACROSS IOWA INTO ILLINOIS....ALLOWING SHOWERS AND POSSIBLY SOME THUNDERSTORMS TO DEVELOP. COLD AIR ASSOCIATED WITH THE UPPER LOW WILL PROVIDE A FAVORABLE ENVIRONMENT FOR THE DEVELOPMENT OF COLD AIR FUNNELS. THE MOST LIKELY TIME PERIOD FOR THIS WOULD BE DURING THE AFTERNOON AND EVENING HOURS. ANOTHER STORM SYSTEM IS CURRENT EXPECTED TO AFFECT THE REGION NEXT WEEKEND. THIS WILL BRING YET ANOTHER ROUND OF THUNDERSTORMS TO THE AREA. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING. 08
In the hours before
Local storm report, May 31, 5:25 PM CDT, 35 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
525 PM CDT MON MAY 31 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0520 PM HAIL AUGUSTA 40.75N 91.28W
05/31/2004 0.25 INCH LEE IA AMATEUR RADIO
HAIL COVERED GROUND. 40 MPH WIND GUST.
&&
14Local storm report, May 31, 5:27 PM CDT, 33 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
527 PM CDT MON MAY 31 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0520 PM HAIL 2 SW NEW WINDSOR 41.18N 90.48W
05/31/2004 0.25 INCH MERCER IL TRAINED SPOTTER
&&
14Local storm report, May 31, 5:29 PM CDT, 31 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
529 PM CDT MON MAY 31 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0501 PM HAIL JOY 41.20N 90.88W
05/31/2004 0.50 INCH MERCER IL TRAINED SPOTTER
HAIL ACCUMULATED ON THE GROUND
&&
ERVINLocal storm report, May 31, 5:30 PM CDT, 30 minutes before
PRELIMINARY LOCAL STORM REPORT ... CORRECTION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
530 PM CDT MON MAY 31 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0501 PM HAIL ALEDO 41.20N 90.75W
05/31/2004 0.50 INCH MERCER IL TRAINED SPOTTER
HAIL ACCUMULATED ON THE GROUND
&&
ERVINLocal storm report, May 31, 5:38 PM CDT, 22 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
538 PM CDT MON MAY 31 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0345 PM HAIL MUSCATINE 41.42N 91.07W
05/31/2004 0.75 INCH MUSCATINE IA TRAINED SPOTTER
0338 PM HAIL 2 N MUSCATINE MUNICIPAL 41.40N 91.15W
05/31/2004 0.75 INCH MUSCATINE IA TRAINED SPOTTER
&&
14Local storm report, May 31, 5:50 PM CDT, 10 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
550 PM CDT MON MAY 31 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0545 PM HAIL LOMAX 40.68N 91.08W
05/31/2004 0.50 INCH HENDERSON IL LAW ENFORCEMENT
&&
14The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 3:42 PM CDT | Severe Thunderstorm Warning | DVN | Rock Island | 48 min |
| May 31, 3:52 PM CDT | Severe Thunderstorm Warning | DVN | Whiteside | 28 min |
| May 31, 4:55 PM CDT | Severe Thunderstorm Warning | DVN | Mercer | 35 min |
| May 30, 7:16 PM CDT | Tornado Warning | DVN | Buchanan | 44 min |
| May 31, 4:04 AM CDT | Severe Thunderstorm Warning | DVN | Linn | 56 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2004Severe Thunderstorm Warnings in Iowa, 2004Every severe thunderstorm warning in 2004
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.