Alert archive / Iowa / Severe Thunderstorm Warnings in 2004
Severe Thunderstorm Warning 386, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 18, 2004, 5:03 PM CDT for Clarke County, Decatur County, Iowa. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 18, 2004, 5:03 PM CDT (22:03 UTC)
- Expired
- Aug 18, 2004, 5:45 PM CDT
- In force
- 42 min
- Issued by
- NWS Des Moines, IA
- Area
- Counties, with a storm outline in the text
Counties Clarke County, IA, Decatur County, IA
The radar
The Des Moines radar (KDMX), 94 km from the middle of the area, began a volume at 22:06 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 18, 4:50 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 10.1 hours before the alert went out and 287 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
- 3 J/kg
- Mixed-layer CIN
- -230 J/kg
- Mixed-layer LCL
- 1075 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 47 m²/s²
- 0-3 km storm-relative helicity
- 139 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 18, 3:15 PM CDT, 1 hour 48 minutes earlier.
Area forecast discussion, Aug 18, 3:15 PM CDT, 1 hour 48 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DES MOINES IA 315 PM CDT WED AUG 18 2004 .DISCUSSION... STG CDFNT ENTERING IA ATTM WL SWEEP ACRS STATET THIS EVE. RAIN COOLED COOL POOL OVR CNTRL IA WL DEMARK THE SVR POT ARAS. ONE AREA IS OVR THE FAR N AND NERN ZNS THAT HAD A CHC TO WRM UP. THE OTR OVR THE S ALNG SFC OUTFLOW BNDRY. RICH AIR TO THE S OF THE BNDRY WITH DPS IN THE LO 70S. BEST CHC WL BE THE SRN AREA. NSW FOR THU, BUT WL SEE A ROUND OF PCPN IN DEF ZN THU NGT INTO FRI MRNG. TROWL CLEARLY SHWS THE S HLF OF IA GETTING ON ON THIS. COOLER THAN NORM WX THRU FCST WITH WRMG TREND SETTING UP ERY NXT WK. CLDS WL BE A FACTOR AND FOR THAT REASON KEPT TEMPS A FEW DEG BLO NORM YET. ALSO KEPT PERIODIC PCPN CHCS IN AND XPCT MSTLY NOCTURNAL TSRA. && .DMX WATCHES/WARNINGS/ADVISORIES...NONE &&
Hazardous weather outlook, Aug 18, 3:57 PM CDT, 1 hour 6 minutes before
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</html>In the hours before
Special weather statement, Aug 18, 4:55 PM CDT, 8 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 455 PM CDT WED AUG 18 2004 IAZ083>086-092>097-190400- SEVERE THUNDERSTORM WATCH #760 REMAINS IN EFFECT UNTIL 1100 PM CDT FOR THE COUNTIES OF... APPANOOSE CLARKE DAVIS DECATUR LUCAS MONROE RINGGOLD TAYLOR WAPELLO WAYNE COGIL
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 5:39 PM CDT | Severe Thunderstorm Warning | DMX | Lucas | 51 min |
| Aug 18, 6:06 PM CDT | Severe Thunderstorm Warning | DMX | Monroe | 39 min |
| Aug 18, 6:14 PM CDT | Severe Thunderstorm Warning | DMX | Davis, Wapello | 46 min |
Nearby
Severe 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.