Alert archive / Iowa / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 41, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at May 16, 1999, 8:36 PM CDT for Jasper County, Marshall County, Iowa. It was in force for 49 min. 1 report 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 16, 1999, 8:36 PM CDT (01:36 UTC)
- Expired
- May 16, 1999, 9:25 PM CDT
- In force
- 49 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Jasper County, IA, Marshall County, IA
The radar
The Des Moines radar (KDMX), 60 km from the middle of the area, began a volume at 01:37 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 16, 9:30 PM CDT | Thunderstorm Wind 56 | Marshalltown, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 16, 3:00 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 1.6 hours before the alert went out and 211 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
- 3009 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 1174 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 5.9
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 Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 16, 6:27 PM CDT, 2 hours 9 minutes earlier.
Area forecast discussion, May 16, 6:27 PM CDT, 2 hours 9 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DES MOINES IA 628PM CDT SUN MAY 16 1999 RAINFALL RATES GETTING OUT OF HAND SO ALTHOUGH ITS A LTL LATE HAVE DECIDED TO ISSUE FLASH FLOOD WATCH FOR THE ENTIRE CWA OVNGT. MAIN TSTM COMPLEX TWRD MO RVR HAS YET TO REACH FA AND WITH CONVECTION LINING UP INTO KS...SGFNT TRAINING MAY TAKE PLACE. .DSM...FLASH FLOOD WATCH TNGT ENTIRE DMX FA. SMALL
In the hours before
Local storm report, May 16, 3:10 PM CDT, 5 hours 26 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
310 PM CDT SUN MAY 16 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1145 AM WOOLSTOCK IA .75 INCH HAIL
05/16/99 WRIGHT
1201 PM POPEJOY IA .75 INCH HAIL
05/16/99 FRANKLIN
1203 PM ROWAN IA 1.25 INCH HAIL
05/16/99 WRIGHT
1212 PM HAMPTON IA 1 INCH HAIL
05/16/99 FRANKLIN
1221 PM 2 E DOWS IA .75 INCH HAIL
05/16/99 FRANKLIN
1221 PM 2 E DOWS IA .75 INCH HAIL
05/16/99 FRANKLIN
1221 PM 2 E DOWS IA .75 INCH HAIL
05/16/99 FRANKLIN
1221 PM 2 E DOWS IA .75 INCH HAIL
05/16/99 FRANKLIN
1223 PM 2 NE HANSELL IA 1.75 INCH HAIL
05/16/99 FRANKLIN
1230 PM 4 SE ALLISON IA 1 INCH HAIL
05/16/99 BUTLER
1248 PM 2 S BRISTOW IA .75 INCH HAIL
05/16/99 BUTLER
1251 PM 2 E PLAINFIELD IA 1.75 INCH HAIL
05/16/99 BREMER
1253 PM 5 SE HANSELL IA 1 INCH HAIL
05/16/99 FRANKLIN
0105 PM 7 E PLAINFIELD IA 1.75 INCH HAIL
05/16/99 BREMER
0121 PM 7 SW ALLISON IA .75 INCH HAIL
05/16/99 BUTLER
0130 PM PARKERSBURG IA .75 INCH HAIL
05/16/99 BUTLER
0150 PM 4 SW SUMNER IA 1 INCH HAIL
05/16/99 BREMER
0221 PM 5 N WATERLOO IA .75 INCH HAIL
05/16/99 BLACKHAWKLocal storm report, May 16, 3:10 PM CDT, 5 hours 26 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
310 PM CDT SUN MAY 16 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1145 AM WOOLSTOCK IA .75 INCH HAIL
05/16/99 WRIGHT
1201 PM POPEJOY IA .75 INCH HAIL
05/16/99 FRANKLIN
1203 PM ROWAN IA 1.25 INCH HAIL
05/16/99 WRIGHT
1212 PM HAMPTON IA 1 INCH HAIL
05/16/99 FRANKLIN
1221 PM 2 E DOWS IA .75 INCH HAIL
05/16/99 FRANKLIN
1221 PM 2 E DOWS IA .75 INCH HAIL
05/16/99 FRANKLIN
1221 PM 2 E DOWS IA .75 INCH HAIL
05/16/99 FRANKLIN
1221 PM 2 E DOWS IA .75 INCH HAIL
05/16/99 FRANKLIN
1223 PM 2 NE HANSELL IA 1.75 INCH HAIL
05/16/99 FRANKLIN
1230 PM 4 SE ALLISON IA 1 INCH HAIL
05/16/99 BUTLER
1248 PM 2 S BRISTOW IA .75 INCH HAIL
05/16/99 BUTLER
1251 PM 2 E PLAINFIELD IA 1.75 INCH HAIL
05/16/99 BREMER
1253 PM 5 SE HANSELL IA 1 INCH HAIL
05/16/99 FRANKLIN
0105 PM 7 E PLAINFIELD IA 1.75 INCH HAIL
05/16/99 BREMER
0121 PM 7 SW ALLISON IA .75 INCH HAIL
05/16/99 BUTLER
0130 PM PARKERSBURG IA .75 INCH HAIL
05/16/99 BUTLER
0150 PM 4 SW SUMNER IA 1 INCH HAIL
05/16/99 BREMER
0221 PM 5 N WATERLOO IA .75 INCH HAIL
05/16/99 BLACKHAWKSpecial weather statement, May 16, 7:01 PM CDT, 1 hour 35 minutes before
IAZ057-058-070-071-170015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 701 PM CDT SUN MAY 16 1999 ...TORNADO WARNING UNTIL 725 PM FOR CASS AND AUDUBON COUNTIES... AT 7 PM RADAR INDICATED SEVERE THUNDERSTORMS EXTENDING ACROSS MOST OF CASS COUNTY INTO EASTERN AUDUBON COUNTY. LARGE HAIL HAS BEEN REPORTED WITH THESE STORMS. ALTHOUGH RADAR INDICATES THE ROTATION IN THESE STORMS HAS DECREASED... THESE STORMS MAY PRODUCE A TORNADO AT ANY TIME. JW
Special weather statement, May 16, 7:01 PM CDT, 1 hour 35 minutes before
IAZ057-058-070-071-170015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 701 PM CDT SUN MAY 16 1999 ...TORNADO WARNING UNTIL 725 PM FOR CASS AND AUDUBON COUNTIES... AT 7 PM RADAR INDICATED SEVERE THUNDERSTORMS EXTENDING ACROSS MOST OF CASS COUNTY INTO EASTERN AUDUBON COUNTY. LARGE HAIL HAS BEEN REPORTED WITH THESE STORMS. ALTHOUGH RADAR INDICATES THE ROTATION IN THESE STORMS HAS DECREASED... THESE STORMS MAY PRODUCE A TORNADO AT ANY TIME. JW
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 16, 7:35 PM CDT | Flash Flood Warning | DMX | Black Hawk | 115 min |
| May 16, 7:44 PM CDT | Tornado Warning | DMX | Boone, Dallas | 31 min |
| May 16, 7:52 PM CDT | Severe Thunderstorm Warning | DMX | Dallas, Madison, Polk, Warren | 48 min |
| May 16, 7:54 PM CDT | Flash Flood Warning | DMX | Bremer | 3 hr |
| May 16, 8:16 PM CDT | Flash Flood Warning | DMX | Cass | 3 hr |
| May 16, 8:17 PM CDT | Tornado Warning | DMX | Boone, Story | 33 min |
| May 16, 8:44 PM CDT | Tornado Warning | DMX | Hamilton, Story | 31 min |
| May 16, 9:00 PM CDT | Tornado Warning | DMX | Hardin | 50 min |
| May 16, 9:43 PM CDT | Flash Flood Warning | DMX | Black Hawk | 77 min |
| May 16, 10:02 PM CDT | Flash Flood Warning | DMX | Butler | 3 hr |
| May 17, 8:47 AM CDT | Flash Flood Warning | DMX | Black Hawk | 6 hr |
Nearby
Severe Thunderstorm Warnings in Iowa, 1999Every severe thunderstorm warning in 1999
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.