Alert archive / South Dakota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 176, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 27, 1999, 9:27 PM CDT for Lake County, Miner County, South Dakota. It was in force for 48 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 27, 1999, 9:27 PM CDT (02:27 UTC)
- Expired
- Jul 27, 1999, 10:15 PM CDT
- In force
- 48 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Lake County, SD, Miner County, SD
The radar
The Sioux Falls radar (KFSD), 71 km from the middle of the area, began a volume at 02:27 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 |
|---|---|---|---|
| Jul 27, 6:30 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 2.5 hours before the alert went out and 313 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
- 2389 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1083 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 71 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 9.3
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 27, 3:20 PM CDT, 6 hours 7 minutes earlier.
Area forecast discussion, Jul 27, 3:20 PM CDT, 6 hours 7 minutes before
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 320 PM CDT TUE JUL 27 1999 SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP/MOVE INTO THE WESTERN CWA THIS EVENING AND SPREAD INTO THE EASTERN CWA DURING THE NIGHT. SEVERE WEATHER IS A POTENTIAL IN ALL OF THE CWA...BUT THE AREA FROM HURON TO MARSHALL WILL HAVE A GREATER PROBABILITY AND LIES JUST SOUTH OF THE EXISTING TORNADO WATCH 561. H5 RIDGE BUILDING INTO THE REGION WILL RETURN HOT AND HUMID CONDITIONS TO THE CWA FOR WEDNESDAY AND THURSDAY. THE HEAT INDEX WILL START TO PUSH THE CRITICAL 105 MARK. FWC GUIDANCE WAS ON THE HIGH SIDE FOR THE NEXT COUPLE OF DAYS FOR MAX TEMPERATURES. THE EXTENDED FORECAST MAY BRING A CHANCE OF THUNDERSTORMS BY AS EARLY THURSDAY NIGHT. UPPER LEVEL TROUGH AND SURFACE FRONT MOVING INTO THE CWA FRIDAY AND FRIDAY NIGHT...AND COOLER AIR WILL SETTLE IN ACROSS THE REGION FOR SATURDAY AND hSUNDAY. FRIDAY AND SATURDAY WILL CONTINUE TO HAVE A CHANCE OF THUNDERSTORMS. .FSD...NONE UMLAND
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 8:29 PM CDT | Severe Thunderstorm Warning | FSD | Beadle | 51 min |
| Jul 27, 9:00 PM CDT | Severe Thunderstorm Warning | FSD | Kingsbury | 35 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; radar from the NEXRAD Level II archive.