Alert archive / South Dakota / Heat Advisories in 2011

Heat Advisory 2, NWS Aberdeen, SD

July 30, 201126 counties in South Dakota; Big Stone County, Traverse County, Minnesota

NWS Aberdeen, SD issued this heat advisory at Jul 30, 2011, 3:56 PM CDT for 26 counties in South Dakota; Big Stone County, Traverse County, Minnesota. It took effect at Jul 31, 2011, 12:00 PM CDT. It was in force for 34 hr.

The area

The counties it named.

The facts

Issued
Jul 30, 2011, 3:56 PM CDT (20:56 UTC)
In effect from
Jul 31, 2011, 12:00 PM CDT
Expired
Aug 1, 2011, 9:51 PM CDT
In force
34 hr
Issued by
NWS Aberdeen, SD
All 28 counties

Big Stone County, MN, Traverse County, MN, Brown County, SD, Buffalo County, SD, Campbell County, SD, Clark County, SD, Codington County, SD, Corson County, SD, Day County, SD, Deuel County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, Marshall County, SD, McPherson County, SD, Potter County, SD, Roberts County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 56 km from the middle of the area, began a volume at 20:58 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

Aberdeen, SD (KABR), launched 12:00Z, 8.9 hours before the alert went out and 34 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-pSkew-T log-p diagram, Aberdeen, SD at 12:00Z on 2011-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2567 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 12:00Z on 2011-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 130 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2567 J/kg
Mixed-layer CIN
-127 J/kg
Mixed-layer LCL
1142 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
130 m²/s²
0-3 km storm-relative helicity
197 m²/s²
Significant tornado parameter
0.8
Supercell composite
8.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Jul 30, 3:52 PM CDT, 4 minutes earlier.

Area forecast discussion, Jul 30, 3:52 PM CDT, 4 minutes before
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Hazardous weather outlook, Jul 30, 3:51 AM CDT, 12 hours 5 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ABERDEEN SD
351 AM CDT SAT JUL 30 2011

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-310900-
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-
351 AM CDT SAT JUL 30 2011 /251 AM MDT SAT JUL 30 2011/

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

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS ARE POSSIBLE LATE THIS AFTERNOON AND EVENING AS A
FRONTAL BOUNDARY DROPS INTO THE AREA. SEVERE STORMS ARE POSSIBLE
ACROSS EASTERN SOUTH DAKOTA AND WESTERN MINNESOTA WITH LARGE HAIL
AND STRONG WINDS.

HEAT INDEX VALUES WILL APPROACH 100 DEGREES THIS AFTERNOON ALONG
AND WEST OF THE JAMES VALLEY.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

ON AND OFF CHANCES FOR THUNDERSTORMS ARE IN THE FORECAST THROUGH
THE PERIOD.

HOT AND HUMID CONDITIONS ARE EXPECTED SUNDAY AND MONDAY WITH HEAT
INDICES SURPASSING 100 DEGREES ACROSS PORTIONS OF THE AREA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NECESSARY LATE THIS AFTERNOON AND
EVENING ACROSS NORTHEASTERN SOUTH DAKOTA AND WEST CENTRAL
MINNESOTA.

TMT

In the hours before

Local storm report, Jul 30, 10:47 AM CDT, 5 hours 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
1047 AM CDT SAT JUL 30 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1110 PM     TSTM WND GST     6 NNW TOLSTOY           45.29N 99.66W
07/29/2011  E60 MPH          EDMUNDS            SD   PUBLIC

            LUMBER MOVED AROUND. CONCRETE PLANTER KNOCKED OVER AND
            ROLLED AROUND. BRANCHES DOWN

1159 PM     TSTM WND GST     9 SE IPSWICH            45.35N 98.90W
07/29/2011  E60 MPH          EDMUNDS            SD   PUBLIC

            TREE BRANCHES DOWN. 3 INCH DIAMTER BRANCHES.

1220 AM     TSTM WND GST     6 SW MINA               45.38N 98.84W
07/30/2011  E60 MPH          EDMUNDS            SD   PUBLIC

&&

KGILLE
Special weather statement, Jul 30, 10:54 AM CDT, 5 hours 2 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
1054 AM CDT SAT JUL 30 2011

MNZ039-046-SDZ008-301630-
BIG STONE-ROBERTS-TRAVERSE-
1054 AM CDT SAT JUL 30 2011

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR NORTHEASTERN
ROBERTS...NORTHWESTERN BIG STONE AND TRAVERSE COUNTIES UNTIL 1130 AM
CDT...

AT 1048 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 9 MILES EAST OF HANKINSON...OR 20 MILES NORTHWEST
OF WHEATON...MOVING SOUTHEAST AT 30 MPH.

A FEW LOCATIONS IN THE ADVISORY INCLUDE VICTOR...ROSHOLT...WHITE
ROCK...TINTAH...WHEATON AND CHARLESVILLE.

PENNY TO NICKEL SIZE HAIL...AND WINDS AROUND 40 TO 50 MPH ARE
POSSIBLE WITH THIS STORM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

&&

MOHR
Local storm report, Jul 30, 11:43 AM CDT, 4 hours 13 minutes before
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Special weather statement, Jul 30, 1:08 PM CDT, 2 hours 48 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 29, 8:34 PM CDTSevere Thunderstorm WarningABRDewey15 min
Jul 29, 8:58 PM CDTSevere Thunderstorm WarningABRDewey47 min
Jul 29, 9:43 PM CDTSevere Thunderstorm WarningABRDewey47 min
Jul 29, 10:50 PM CDTSevere Thunderstorm WarningABREdmunds, Potter, Walworth25 min
Jul 29, 11:12 PM CDTSevere Thunderstorm WarningABREdmunds, Faulk, Potter48 min
Jul 29, 11:43 PM CDTSevere Thunderstorm WarningABREdmunds, Faulk, McPherson32 min
Jul 30, 12:15 AM CDTSevere Thunderstorm WarningABRBrown, Edmunds22 min
Jul 30, 11:06 AM CDTSevere Thunderstorm WarningABRRoberts39 min

Nearby

Heat Advisories in South Dakota, 2011Heat Advisories in Minnesota, 2011Every heat advisory in 2011

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.