Alert archive / South Dakota / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 102, NWS Aberdeen, SD
NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 4, 2020, 4:30 AM CDT for 4 counties in South Dakota. It was in force for 45 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 4, 2020, 4:30 AM CDT (09:30 UTC)
- Expired
- Jul 4, 2020, 5:15 AM CDT
- In force
- 45 min
- Issued by
- NWS Aberdeen, SD
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Campbell County, SD, Corson County, SD, Dewey County, SD, Walworth County, SD
The radar
The Bismarck radar (KBIS), 140 km from the middle of the area, began a volume at 09:31 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 nearest sounding before it
Bismarck Municip, ND (KBIS), launched 00:00Z, 9.5 hours before the alert went out and 140 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
- 595 J/kg
- Mixed-layer CIN
- -221 J/kg
- Mixed-layer LCL
- 2139 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- -52 m²/s²
- 0-3 km storm-relative helicity
- 105 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -1.1
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 Aberdeen, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 4, 3:49 AM CDT, 41 minutes earlier.
Area forecast discussion, Jul 4, 3:49 AM CDT, 41 minutes before
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Hazardous Weather Outlook National Weather Service Aberdeen SD 442 AM CDT Fri Jul 3 2020 MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-040945- Traverse-Big Stone-Corson-Campbell-McPherson-Brown-Marshall-Roberts- Walworth-Edmunds-Day-Dewey-Potter-Faulk-Spink-Clark-Codington-Grant- Hamlin-Deuel-Stanley-Sully-Hughes-Hyde-Hand-Jones-Lyman-Buffalo- 442 AM CDT Fri Jul 3 2020 /342 AM MDT Fri Jul 3 2020/ This Hazardous Weather Outlook is for west central Minnesota, central South Dakota, north central South Dakota and northeast South Dakota. .DAY ONE...Today and tonight. Showers will be possible over northeastern South Dakota through the early morning hours. Locally strong and gusty winds of 50 to 60 mph are possible with showers. North central South Dakota will see showers and thunderstorms through the morning hours today. Severe storms are not expected. Additional thunderstorms will be possible tonight, mainly for locations north of Highway 212. Gusty winds and hail will be possible with some storms. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. Additional afternoon and nighttime thunderstorms are possible Saturday through early next week. Some storms on Saturday and Sunday could become strong to severe. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. SD
In the hours before
Special weather statement, Jul 3, 11:30 PM CDT, 5 hours before
Special Weather Statement
National Weather Service Aberdeen SD
1030 PM MDT Fri Jul 3 2020
SDZ003-040500-
Corson SD-
1030 PM MDT Fri Jul 3 2020
...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CORSON COUNTY UNTIL
1100 PM MDT...
At 1029 PM MDT, Doppler radar was tracking a strong thunderstorm over
Thunder Hawk, or 8 miles east of Lemmon, moving east at 25 mph.
Pea size hail and wind gusts up to 50 mph will be possible with this
storm.
Locations impacted include...
Keldron and Thunder Hawk.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4594 10200 4595 10187 4594 10174 4582 10175
4583 10200
TIME...MOT...LOC 0429Z 268DEG 20KT 4594 10198
SDLocal storm report, Jul 4, 3:59 AM CDT, 31 minutes before
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</html>The office that day
Everything else NWS Aberdeen, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 4:00 AM CDT | Special Weather Statement | ABR | Campbell | 45 min |
| Jul 4, 7:01 AM CDT | Severe Thunderstorm Warning | ABR | Campbell, Corson, Dewey, Walworth | 44 min |
| Jul 4, 7:51 AM CDT | Special Weather Statement | ABR | Campbell | 39 min |
| Jul 4, 6:05 PM CDT | Severe Thunderstorm Warning | ABR | Brown, Edmunds, McPherson | 40 min |
| Jul 4, 6:56 PM CDT | Special Weather Statement | ABR | McPherson | 49 min |
| Jul 4, 6:58 PM CDT | Special Weather Statement | ABR | Stanley | 47 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2020Every severe thunderstorm warning in 2020
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.