Alert archive / South Dakota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 141, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 3, 1999, 12:43 AM CDT for Hanson County, South Dakota. 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 counties it named.
The facts
- Issued
- Jul 3, 1999, 12:43 AM CDT (05:43 UTC)
- Expired
- Jul 3, 1999, 1:30 AM CDT
- In force
- 47 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Hanson County, SD
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 2, 9:30 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 3, 12:00 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 5.7 hours before the alert went out and 145 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
- 235 J/kg
- Mixed-layer CIN
- -306 J/kg
- Mixed-layer LCL
- 766 m above ground
- 0-6 km bulk shear
- 70 kt
- 0-1 km storm-relative helicity
- 77 m²/s²
- 0-3 km storm-relative helicity
- 280 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 2, 9:50 PM CDT, 2 hours 53 minutes earlier.
Area forecast discussion, Jul 2, 9:50 PM CDT, 2 hours 53 minutes before
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 950 PM CDT FRI JUL 2 1999 TSTM DVLPMNT SEEMS TO BE GOING AS PLANNED BY AFTN FCSTR WITH ACTVTY TO DO A NUMBER ON FCST AREA NEAR AND AFTR MIDNGHT. FCST WELL WORDED WITH SVR AND HVY RAIN MENTN SO LATEST WATCH FOR WRN PART OF OUR SD AREA...HON TO MHE TO PKS...IS THE ONLY UPDATE NEEDED NOW. PLENTY OF RIPE AIR AVBL. EVRYBODY SEEMS TO BE EVENLY TARGETED NOW BUT WUDNT BE SURPRISED TO SEE NRN PART OF AREA A BIT FAVORED WITH TIME...AGN AS MENTND IN AFTN FCST. THIS MAY BE A PRETTY GOOD SOAKER AND NOT JUST UR AVERAGE JOE TYPE OF TSTM EVENT. .FSD...NONE WILLIAMS
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 2, 10:53 PM CDT | Severe Thunderstorm Warning | FSD | Gregory | 62 min |
| Jul 2, 11:21 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix | 59 min |
| Jul 2, 11:51 PM CDT | Severe Thunderstorm Warning | FSD | Douglas | 49 min |
| Jul 3, 12:20 AM CDT | Severe Thunderstorm Warning | FSD | Davison, Hutchinson | 60 min |
| Jul 3, 12:20 AM CDT | Severe Thunderstorm Warning | FSD | Aurora | 60 min |
| Jul 3, 12:38 AM CDT | Severe Thunderstorm Warning | FSD | Sanborn | 47 min |
| Jul 3, 1:08 AM CDT | Severe Thunderstorm Warning | FSD | Beadle, Kingsbury | 62 min |
| Jul 3, 1:37 AM CDT | Severe Thunderstorm Warning | FSD | Brookings, Moody | 48 min |
| Jul 3, 1:57 AM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Pipestone | 48 min |
| Jul 3, 2:19 AM CDT | Severe Thunderstorm Warning | FSD | Lyon, Murray | 46 min |
| Jul 3, 2:30 AM CDT | Severe Thunderstorm Warning | FSD | Nobles | 35 min |
| Jul 3, 2:45 AM CDT | Severe Thunderstorm Warning | FSD | Cottonwood | 65 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 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; the sounding from the Mesonet's radiosonde archive.