Alert archive / Iowa / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 64, NWS Quad Cities, IA

May 14, 2003Linn County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at May 14, 2003, 6:02 PM CDT for Linn County, Iowa. It was in force for 43 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: May 14, 2003, 6:02 PM CDT (23:02 UTC)
Expired: May 14, 2003, 6:45 PM CDT
In force: 43 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County Linn County, IA

The radar

The Quad Cities radar (KDVN), 98 km from the middle of the area, began a volume at 23:06 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 nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.0 hours before the alert went out and 104 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: 5 J/kg
Mixed-layer CIN: -139 J/kg
Mixed-layer LCL: 987 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 154 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.

820 
WUUS53 KDVN 142302
SVRDVN
IAC113-142345-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
601 PM CDT WED MAY 14 2003

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LINN COUNTY IN EAST CENTRAL IOWA

* UNTIL 645 PM CDT

* AT 556 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL OVER TODDVILLE...OR 9 MILES
  NORTH OF CEDAR RAPIDS...MOVING SOUTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM IS EXPECTED TO BE NEAR...
   ROBINS BY 605 PM CDT.
   MARION BY 620 PM CDT.
   MARION AIRPORT BY 625 PM CDT.
   BERTRAM BY 635 PM CDT.

A SECOND SEVERE THUNDERSTORM IS ALSO LOCATED NEAR THE CEDAR RAPIDS 
AIRPORT.  IT IS MOVING SOUTHEAST AT 20 MPH.

THIS SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING HAIL UP TO 1 INCH IN
DIAMETER. TAKE COVER IN A STURDY STRUCTURE UNTIL THE STORM PASSES.

LAT...LON 4216 9165 4206 9182 4188 9182 4188 9142
          4203 9141

$$

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 May 14, 3:25 PM CDT, 2 hours 37 minutes earlier.

Area forecast discussion, May 14, 3:25 PM CDT, 2 hours 37 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
325 PM CDT WED MAY 14 2003

STACKED SYSTEM SPINNING OVER ERN SD EARLY THIS MORNING IS DROPPING
SOUTHEAST.  COMBINATION OF COOL POOL ENHANCING STEEP LAPSE RATES AND
LOW LEVEL CONVERGENCE  GENERATING SCATTERED NEAR SEVERE TO SEVERE
TSRA.  MAINLY LARGE HAIL REPORTS SO FAR.  NEXT LINE JUST WEST OF CWA
MAY HAVE SOME WIND CONCERNS WITH LAPS CAPES UP TO 1400 J/KG TO FEED
ON.  EXPECT SEVERE THREAT TO END MID TO LATE EVENING AS UPPER LOW
MOVES INTO SERN IA.

MODELS IN GOOD AGREEMENT THROUGH FRIDAY ROTATING UPPER LOW INTO THE
NORTHERN GREAT LAKES.  INVERTED TROF HANGS UP OVER IA THURSDAY.
WITH HIGH LOW LEVEL RH NEAR TROF...THERE WILL BE A THREAT OF SOME -RA
AT LEAST THROUGH 18Z.  STALLED SURFACE FRONT TO OUR SOUTH AND HIGH
PRESSUE RIDGE BUILDING THROUGH THE NORTHERN GREAT LAKES EAST TO
NORTHEAST FLOW WILL SETUP OVER CWA THURSDAY AFTERNOON INTO FRIDAY.
LOW LEVELS NEVER DRY OUT TO ANY EXTENT. SO WITH SOME CLOUDS AND COOL
NE FLOW...STILL AT OR BELOW COOLER MOS NUMBERS. MODELS BRING
SOUTHERN STREAM S/W OUT OF THE SW U.S. THURSDAY NIGHT AND FRIDAY.
LOW PRESSURE DEVELOPS ALONG STALLED SURFACE BOUNDARY AND MOVES INTO
NRN OK BY 00Z SAT.  GFS OMEGA SUGGEST THAT PCPN MAY MAKE IT AS FAR N
AS SOUTHERN CWA FRIDAY AFTERNOON.  HOWVER FORCING THAT FAR N IS WEAK
AND PCPN WILL BE FIGHTING NORTHEAST FLOW...SO WILL LEAVE FCST DRY.

NO BIG CHANGES IN THE EXTENDED.  CWA IN BETWEEN STREAMS EARLY IN THE
PERIOD.  MODELS IN GOOD AGREEMENT SATURDAY MOVING SRN STREAM SYSTEM
ACROSS SOUTHERN MO/NRN AR KEEPING NORTHERN EDGE OF PCPN JUST TO OUR
SOUTH.   FAIRLY POTENT NRN STREAM TROUGH STILL PROGGED THROUGH
REGION BY MID WEEK. THERE ARE SOME MODEL DIFFERENCES WITH THIS
SYSTEM.  UKMET CLOSES AN H5 LOW OFF OVER SOUTHERN CANADA BY EARLY
MONDAY AND MOVES IT SLOWLY ACROSS CENTRAL CANADA THROUGH WEDNESDAY.
ECMWF AND GFS ARE IN BETTER AGREEMENT WITH OPEN WAVE DRIVING A COLD
FRONT THROUGH TUESDAY AND WILL CONTINUE CURRENT MENTION OF TSRA
TUESDAY.  WILL GO DRY FOR WEDNESDAY...BUT LOOKS WINDY WITH TIGHT
SURFACE PRESSURE GRADIENT OVER REGION AHEAD OF STRONG HIGH PRESSURE
OVER THE NORTHERN PLAINS.

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

DLF

Hazardous weather outlook, May 14, 5:00 AM CDT, 13 hours 2 minutes before

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-151000-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
500 AM CDT WED MAY 14 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 WEAK UPPER LEVEL DISTURBANCE WILL MOVE EAST OF THE AREA THIS
MORNING TAKING THE RAIN AND ISOLATED THUNDERSTORM THREAT WITH IT.

THIS AFTERNOON INTO THIS EVENING A STRONGER UPPER LEVEL DISTURBANCE
WILL MOVE THROUGH THE AREA. COLD AIR ALOFT WILL ALLOW THUNDERSTORMS
TO REDEVELOP BRINGING A THREAT OF HAIL. MOST OF THE HAIL SHOULD ONE
HALF INCH OR LESS...HOWEVER SOME OF THE STRONGER STORMS MAY PRODUCE
HAIL UP TO AN INCH. AFTER SUNSET THE THUNDERSTORMS WILL DISSIPATE
WITH SCATTERED SHOWERS EXPECTED OVERNIGHT.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED THROUGH THE WEEKEND. HOWEVER ANY
REPORTS OF HAIL THIS AFTERNOON AND EVENING WILL BE APPRECIATED.

&&

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

SF

In the hours before

Local storm report, May 14, 4:51 PM CDT, 1 hour 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
451 PM CDT WED MAY 14 2003

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

0445 PM    BRANDON                   IA   .25 INCH HAIL
05/14/03   BUCHANAN                       REPORTED BY EMERGENCY
                                          MANAGEMENT.

Local storm report, May 14, 4:57 PM CDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
457 PM CDT WED MAY 14 2003

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

0455 PM    KEYSTONE                  IA   .88 INCH HAIL
05/14/03   BENTON                         REPORTED BY EMERGENCY
                                          MANAGEMENT.

Local storm report, May 14, 5:18 PM CDT, 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
518 PM CDT WED MAY 14 2003

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

0517 PM    URBANA                    IA   .75 INCH HAIL
05/14/03   BENTON                         REPORTED BY EMERGENCY
                                          MANAGEMENT.

Local storm report, May 14, 5:44 PM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
544 PM CDT WED MAY 14 2003

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

0541 PM    INDEPENDENCE              IA   HEAVY RAIN
05/14/03   BUCHANAN                       REPORTED BY EMERGENCY
                                          MANAGEMENT.

Local storm report, May 14, 5:54 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
554 PM CDT WED MAY 14 2003

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

0552 PM    TODDVILLE                 IA   .5 INCH HAIL
05/14/03   LINN                           REPORTED BY EMERGENCY
                                          MANAGEMENT.

Local storm report, May 14, 6:00 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
600 PM CDT WED MAY 14 2003

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

0600 PM    GORIN                     MO   60 MPH TSTM GUST
05/14/03   SCOTLAND                       REPORTED BY STORM
                                          SPOTTER.

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 12:20 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Scott	25 min
May 14, 12:59 PM CDT	Severe Thunderstorm Warning	DVN	Muscatine, Scott	46 min
May 14, 2:29 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Scott	46 min
May 14, 4:08 PM CDT	Severe Thunderstorm Warning	DVN	Keokuk	37 min
May 14, 4:33 PM CDT	Severe Thunderstorm Warning	DVN	Washington	42 min
May 14, 4:57 PM CDT	Severe Thunderstorm Warning	DVN	Benton	48 min
May 14, 5:23 PM CDT	Severe Thunderstorm Warning	DVN	Linn	37 min
May 14, 5:43 PM CDT	Severe Thunderstorm Warning	DVN	Lee, Van Buren	47 min
May 14, 5:47 PM CDT	Flash Flood Warning	DVN	Buchanan	4 hr
May 14, 5:57 PM CDT	Severe Thunderstorm Warning	DVN	Johnson	48 min
May 14, 6:05 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines	55 min
May 14, 6:40 PM CDT	Severe Thunderstorm Warning	DVN	Cedar	50 min
May 14, 6:50 PM CDT	Severe Thunderstorm Warning	DVN	Johnson	25 min

Nearby

Severe Thunderstorm Warnings in Iowa, 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.