Alert archive / Missouri / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 6, NWS Quad Cities, IA

April 30, 2003Clark County, Missouri; Lee County, Iowa; Hancock County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 30, 2003, 1:28 PM CDT for Clark County, Missouri; Lee County, Iowa; Hancock County, Illinois. It was in force for 47 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: Apr 30, 2003, 1:28 PM CDT (18:28 UTC)
Expired: Apr 30, 2003, 2:15 PM CDT
In force: 47 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

Counties Lee County, IA, Hancock County, IL, Clark County, MO

The radar

The Quad Cities radar (KDVN), 147 km from the middle of the area, began a volume at 18:29 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 30, 1:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 6.5 hours before the alert went out and 151 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 849 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 478 m²/s²
0-3 km storm-relative helicity: 567 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

445 
WUUS53 KDVN 301828
SVRDVN
IAC111-ILC067-MOC045-301915-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
128 PM CDT WED APR 30 2003

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLARK COUNTY IN NORTHEAST MISSOURI
  LEE COUNTY IN SOUTHEAST IOWA
  HANCOCK COUNTY IN WEST CENTRAL ILLINOIS

* UNTIL 215 PM CDT

* AT 123 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL AND DAMAGING WINDS 3 MILES
  SOUTHEAST OF WAYLAND...OR 8 MILES SOUTHWEST OF KEOKUK...MOVING
  NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM IS EXPECTED TO BE NEAR...
   ALEXANDRIA BY 130 PM CDT.
   KEOKUK BY 135 PM CDT.
   HAMILTON BY 140 PM CDT.
   WESTERN ILLINOIS THRESHERS BY 145 PM CDT.

THIS SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING HAIL UP TO THE SIZE
OF GOLFBALLS OR 1.75 INCHES IN DIAMETER AND WINDS IN EXCESS OF 55
MPH. TAKE COVER IN A STURDY STRUCTURE UNTIL THE STORM PASSES.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 600 PM CDT
WEDNESDAY EVENING FOR SOUTHEASTERN IOWA AND NORTHWESTERN ILLINOIS.

LAT...LON 4042 9167 4025 9155 4026 9093 4064 9095
          4057 9136

$$

WOLF

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 Apr 30, 1:22 PM CDT, 6 minutes earlier.

Area forecast discussion, Apr 30, 1:22 PM CDT, 6 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
122 PM CDT WED APR 30 2003

WILL UPDATE ZONES FOR SVR TSTM WATCH NUMBER 187 FOR OUR ILLINOIS
COUNTIES. WILL SEND OUT UPDATE SHORTLY.

DVN...
IA...NONE.
IL...NONE.
MO...NONE.

50

Hazardous weather outlook, Apr 30, 5:20 AM CDT, 8 hours 8 minutes before

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-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
520 AM CDT WED APR 30 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN IOWA...
NORTHWEST AND WEST CENTRAL ILLINOIS...AND NORTHEAST MISSOURI.

.DAY ONE...TODAY AND TONIGHT

A STRONG...SPRING LOW PRESSURE SYSTEM LOCATED OVER KANSAS WILL MOVE INTO
MISSOURI TODAY.  SHOWERS AND THUNDERSTORMS WILL CONTINUE TO FIRE ALONG
AND NORTH OF A STATIONERY FRONT PARKED SOUTH OF I-80 TODAY.  BY LATE
AFTERNOON...STORMS ARE ALSO EXPECTED TO DEVELOP ALONG THE TRAILING COLD
FRONT. FAIRLY LOW FREEZING LEVELS MAY ALLOW FOR LARGE HAIL UP TO THE
SIZE OF QUARTERS ALONG THE STATIONERY FRONT...NEAR AND NORTH OF I-80.
ALONG AND SOUTH OF HIGHWAY 34...STORMS LATER TODAY INTO THIS EVENING MAY
PRODUCE HAIL THE SIZE OF GOLFBALLS AND POSSIBLY DAMAGING WINDS UP TO 60
MPH. ISOLATED TORNADOES MAY ALSO BE POSSIBLE IN THE WARM AIR SOUTH OF
HIGHWAY 34 IF SURFACE TEMPERATURES REACH INTO THE 80S.  IN ADDITION...
THE SLOW MOVEMENT OF THE LOW PRESSURE SYSTEM AND THE ASSOCIATED FRONTS
WILL BE FAVORABLE FOR EXTENDED PERIODS OF SHOWERS AND STORMS...PRODUCING
WIDESPREAD TOTAL STORM RAIN AMOUNTS OF AN INCH OR MORE...WITH SOME AREAS
RECEIVING UP TO 3 INCHES BY THURSDAY MORNING.  THE HEAVIEST RAIN AMOUNTS
MAY CAUSE SOME MINOR FLOODING IN LOW LYING AND FLOOD PRONE AREAS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

ANOTHER STORM SYSTEM WILL DEVELOP IN THE CENTRAL PLAINS LATE SUNDAY INTO
MONDAY.  SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP AS THIS
SYSTEM PASSES.  SOME OF THESE STORMS MAY REACH SEVERE LEVELS ALONG WITH
MODERATE TO LOCALLY HEAVY RAINFALL AMOUNTS.

EMERGENCY MANAGERS AND SPOTTERS SHOULD MONITOR CONDITIONS LATER TODAY
FOR FURTHER UPDATES ON STORM REDEVELOPMENT THIS AFTERNOON AND EVENING.

.SPOTTER INFORMATION STATEMENT...

STORM SPOTTER ACTIVATION IS PROBABLE THIS AFTERNOON AND EVENING...
ESPECIALLY ALONG AND SOUTH OF HIGHWAY 34.

&&

UPCOMING SPOTTER TRAINING CLASSES:

April 28, 2003:  Training - Keosauqua, IA - 7 pm

Severe weather and tornado spotter training will be conducted in
Keosauqua, Iowa (Van Buren County) at the Roberts Center at 7 pm.
This is a free 2 hour class. For additional information, contact Don
Pool at vbcoeng@netins.net

April 29, 2003:  Training - Keokuk, IA - 630 pm

Severe weather and tornado spotter training will  be conducted in
Keokuk, IA (Lee County) at the Holiday Inn Express at 630 pm.  This
will be a free 2 hour class.  For additional information, contact
Steve Cirinna at 319-372-4124.

MORE INFORMATION MAY BE OBTAINED AT THE FOLLOWING URL:
http://www.crh.noaa.gov/dvn

NICHOLS

In the hours before

Local storm report, Apr 30, 10:02 AM CDT, 3 hours 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1002 AM CDT WED APR 30 2003

TIME(CST)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0947 AM    ATKINS                    IA   50 MPH TSTM GUST
04/30/03   BENTON                         REPORTED BY EMERGENCY
                                          MANAGEMENT.

Local storm report, Apr 30, 10:20 AM CDT, 3 hours 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1020 AM CDT WED APR 30 2003

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0345 AM    4 SW ATKINS               IA   50 MPH TSTM GUST
04/30/03   BENTON                         LIGHT POLES DOWN - 1/2
                                          MILE SOUTH OF HIGHWAY
                                          30 ON STATE HIGHWAY
                                          201. LATE REPORT BY
                                          EMERGENCY MANAGEMENT.

1017 AM    CEDAR RAPIDS              IA   60 MPH TSTM GUST
04/30/03   LINN                           SEMI BLOWN OVER ON
                                          I-380 @ 10 AM, SECOND SEMI
                                          BLOWN OVER ON HWY 13 @ 1010 AM.
                                          REPORTED BY EMERGENCY
                                          MANAGEMENT.

Special weather statement, Apr 30, 10:37 AM CDT, 2 hours 51 minutes before

IAZ042-053-054-065>068-ILZ001-002-007-009-015-301700-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1037 AM CDT WED APR 30 2003

...STRONG TO SEVERE THUNDERSTORMS LIKELY OVER FAR EASTERN IOWA
INTO NORTHWEST ILLINOIS LATE THIS MORNING...

A LINE OF SEVERE THUNDERSTORMS WITH A HISTORY OF PRODUCING WIND
GUSTS AS HIGH AS 60 MPH...PEA SIZE HAIL...AND HEAVY RAINFALL WILL
CONTINUE TO RACE EAST AROUND 45 MPH ACROSS EASTERN IOWA INTO
NORTHWEST ILLINOIS LATE THIS MORNING. THE LINE WILL REACH FROM GALENA
ILLINOIS TO MUSCATINE IOWA BY 1115 AM...THEN MOVE EAST INTO THE
QUAD CITIES AREA BEFORE NOON.

THESE STORMS BLEW OVER POWERLINES AND A COUPLE SEMI TRUCKS IN
EAST CENTRAL IOWA BETWEEN 930 AM AND 1030 AM.

STAY TUNED TO NOAA WEATHER RADIO OR YOUR FAVORITE TELEVISION OR
RADIO STATION FOR POSSIBLE WARNINGS AS THE LINE OF STORMS MARCHES
EAST. NOW IS THE TIME TO PLAN ON TAKING SHELTER IN A STURDY
BUILDING AWAY FROM WINDOWS IF THREATENING WEATHER APPROACHES OR
WARNINGS ARE ISSUED.

SHEETS

Local storm report, Apr 30, 10:51 AM CDT, 2 hours 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1051 AM CDT WED APR 30 2003

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1042 AM    2 N ANAMOSA               IA   45 MPH TSTM GUST
04/30/03   JONES                          STRONG THUNDERSTORM
                                          GUST BLEW PLASTIC
                                          FENCING ACROSS ROADWAY.
                                          REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

Local storm report, Apr 30, 11:00 AM CDT, 2 hours 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1100 AM CDT WED APR 30 2003

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0550 AM    MARION                    IA   .25 INCH HAIL
04/30/03   LINN                           EVENT DURATION 4
                                          MINUTES. REPORTED BY
                                          PUBLIC VIA E-MAIL.

Local storm report, Apr 30, 11:04 AM CDT, 2 hours 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1104 AM CDT WED APR 30 2003

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1056 AM    DYERSVILLE                IA   .25 INCH HAIL
04/30/03   DUBUQUE                        REPORTED BY EMERGENCY
                                          MANAGEMENT.

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 30, 9:49 AM CDT	Severe Thunderstorm Warning	DVN	Linn	26 min
Apr 30, 10:18 AM CDT	Severe Thunderstorm Warning	DVN	Jones	42 min
Apr 30, 1:09 PM CDT	Severe Thunderstorm Warning	DVN	Scott	36 min
Apr 30, 1:11 PM CDT	Severe Thunderstorm Warning	DVN	Scott	34 min
Apr 30, 5:02 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson	43 min
Apr 30, 5:09 PM CDT	Severe Thunderstorm Warning	DVN	Louisa, Washington	51 min
Apr 30, 5:27 PM CDT	Tornado Warning	DVN	Henry, Louisa	33 min
Apr 30, 5:46 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson	29 min
Apr 30, 5:56 PM CDT	Tornado Warning	DVN	Louisa	64 min
Apr 30, 6:01 PM CDT	Tornado Warning	DVN	Louisa	29 min
Apr 30, 6:10 PM CDT	Tornado Warning	DVN	Henry	35 min
Apr 30, 6:19 PM CDT	Tornado Warning	DVN	Des Moines	56 min
Apr 30, 6:31 PM CDT	Tornado Warning	DVN	Louisa	44 min
Apr 30, 3:46 AM CDT	Severe Thunderstorm Warning	DVN	Rock Island, Whiteside	44 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2003 Severe Thunderstorm Warnings in Iowa, 2003 Severe Thunderstorm Warnings in Illinois, 2003 Every severe thunderstorm warning in 2003

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.