Alert archive / South Dakota / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 211, NWS Aberdeen, SD

July 31, 2008McPherson County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 31, 2008, 3:03 AM CDT for McPherson County, South Dakota. 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: Jul 31, 2008, 3:03 AM CDT (08:03 UTC)
Expired: Jul 31, 2008, 3:45 AM CDT
In force: 42 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon

County McPherson County, SD

The radar

The Aberdeen radar (KABR), 72 km from the middle of the area, began a volume at 08:04 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 31, 1:23 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 8.1 hours before the alert went out and 116 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1719 J/kg
Mixed-layer CIN: -151 J/kg
Mixed-layer LCL: 1514 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 10.9

Open this sounding in Storm Lab

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 30, 9:34 PM CDT, 5 hours 29 minutes earlier.

Area forecast discussion, Jul 30, 9:34 PM CDT, 5 hours 29 minutes before

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Hazardous weather outlook, Jul 30, 3:09 PM CDT, 11 hours 54 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ABERDEEN SD
309 PM CDT WED JUL 30 2008

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-312015-
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-
309 PM CDT WED JUL 30 2008 /209 PM MDT WED JUL 30 2008/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL
MINNESOTA...CENTRAL SOUTH DAKOTA...NORTH CENTRAL SOUTH DAKOTA AND
NORTHEAST SOUTH DAKOTA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

ISOLATED THUNDERSTORMS ARE POSSIBLE THIS EVENING ACROSS THE AREA.
SOME OF THESE STORMS COULD BE STRONG TO SEVERE WITH HAIL/HIGH
WINDS BEING THE MAIN THREAT...THOUGH AN ISOLATED TORNADO IS NOT
OUT OF THE QUESTION. THERE WILL BE A BETTER CHANCE FOR STORMS
ACROSS THE EASTERN FORECAST AREA LATE THIS EVENING AND INTO THE
MORNING HOURS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A FEW STORMS WILL PERSIST ACROSS EXTREME EASTERN SOUTH
DAKOTA AND WEST CENTRAL MINNESOTA ON THURSDAY...A FEW OF WHICH
COULD BECOME SEVERE.

CHANCES FOR THUNDERSTORMS RETURN TO THE FORECAST SATURDAY
NIGHT...THEN AGAIN SUNDAY NIGHT THROUGH MONDAY NIGHT. SEVERE
POTENTIAL IS UNCLEAR AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NECESSARY THIS AFTERNOON AND EVENING.

CONNELLY

In the hours before

Local storm report, Jul 30, 9:13 PM CDT, 5 hours 50 minutes before

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Local storm report, Jul 30, 9:37 PM CDT, 5 hours 26 minutes before

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Local storm report, Jul 31, 2:52 AM CDT, 11 minutes before

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The office that day

Everything else NWS Aberdeen, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 30, 7:11 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	64 min
Jul 30, 7:28 PM CDT	Severe Thunderstorm Warning	ABR	Corson	25 min
Jul 30, 7:30 PM CDT	Severe Thunderstorm Warning	ABR	Corson	45 min
Jul 30, 7:38 PM CDT	Areal Flood Advisory	ABR	Lyman	88 min
Jul 30, 7:50 PM CDT	Tornado Warning	ABR	Lyman	25 min
Jul 31, 1:49 AM CDT	Severe Thunderstorm Warning	ABR	Corson	56 min
Jul 31, 2:46 AM CDT	Severe Thunderstorm Warning	ABR	Campbell, Corson	22 min
Jul 31, 3:15 AM CDT	Severe Thunderstorm Warning	ABR	Corson	45 min
Jul 31, 3:37 AM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, McPherson, Marshall	38 min
Jul 31, 4:10 AM CDT	Severe Thunderstorm Warning	ABR	Marshall, Roberts	50 min
Jul 31, 4:13 AM CDT	Severe Thunderstorm Warning	ABR	Brown, Day, Marshall, Spink	51 min
Jul 31, 4:52 AM CDT	Severe Thunderstorm Warning	ABR	Clark, Codington, Day, Grant, Hamlin, Marshall and 2 more	53 min
Jul 31, 5:21 AM CDT	Severe Thunderstorm Warning	ABR	Codington, Deuel, Grant, Hamlin, Roberts	39 min
Jul 31, 6:00 AM CDT	Severe Thunderstorm Warning	ABR	Deuel, Grant, Roberts	30 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2008 Every severe thunderstorm warning in 2008

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.