Alert archive / South Dakota / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 169, NWS Aberdeen, SD

July 29, 2003Hamlin County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 29, 2003, 4:40 PM CDT for Hamlin County, South Dakota. It was in force for 50 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 29, 2003, 4:40 PM CDT (21:40 UTC)
Expired: Jul 29, 2003, 5:30 PM CDT
In force: 50 min
Issued by: NWS Aberdeen, SD
Area: Counties, with a storm outline in the text

County Hamlin County, SD

The radar

The Sioux Falls radar (KFSD), 126 km from the middle of the area, began a volume at 21:39 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 29, 1:40 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 9.7 hours before the alert went out and 99 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: 4 J/kg
Mixed-layer CIN: -422 J/kg
Mixed-layer LCL: 1942 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 29, 2:35 PM CDT, 2 hours 5 minutes earlier.

Area forecast discussion, Jul 29, 2:35 PM CDT, 2 hours 5 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ABERDEEN SD
235 PM CDT TUE JUL 29 2003

...SEVERE THUNDERSTORM WATCH UNTIL 7PM...

.SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT
COLD FRONT MOVING INTO CWA AND SAGGING SOUTHEAST AT ABOUT 20-30MPH.
CONVERGENCE BOUNDARY AHEAD OF FRONT GENERATING THUNDERSTORMS...SOME
HAVE BEEN SEVERE.  INSTABILITY WITH AMPLE LOW LEVEL MOISTURE AND
LIFT MECHANISMS HELPING TO FUEL CONVECTION THIS AFTERNOON.  18Z
SOUNDING SHOWS DOUBLED CAPE AND PW FROM 12Z.  LEADING INFLUENCE OF
COLD FRONT WAS IN VICINITY OF BALLOON TRAVEL DURING THE 18Z LAUNCH.

MODELS IN GOOD SHAPE FOR REMAINDER OF FORECAST PERIOD.  EXPECT UPPER
RIDGE TO REBUILD AND STABILIZE REGION LATE WEDNESDAY.  TEMPERATURES
AND PRECIP TO BE SEASONAL.  FEW CHANGES TO MAJORITY OF GRIDS.
ADJUSTED WX AND POP GRIDS TO REFLECT THUNDER POTENTIAL THIS EVENING
WITH SOME CARRY OVER WEDNESDAY DUE TO WRAP AROUND FLOW.  MCNULTY

.LONG TERM...SATURDAY THROUGH TUESDAY
GFS AND ECMWF MODELS BEGINNING TO SHOW BETTER AGREEMENT. THE PERIOD
STARTS OFF WITH AN UPPER TROUGH SLOWLY DRIFTING EASTWARD OVER THE
GREAT LAKES...AND A RIDGE BUILDING FROM THE SOUTHERN PLAINS
NORTHWARD OVER THE WESTERN HIGH PLAINS. THIS GENERAL PATTERN WILL
CONTINUE INTO EARLY NEXT WEEK...WITH THE RIDGE BUILDING FURTHER TO
THE NORTH THROUGH MONDAY. A SHORTWAVE ROTATING AROUND THE WEST SIDE
OF THE UPPER LOW WILL PUSH THE RIDGE BACK A BIT TO THE WEST ON
TUESDAY...WITH THE BEST ENERGY REMAINING JUST TO THE EAST OF THE
CWA. AT THE SURFACE...A VERY BROAD AND UNORGANIZED PATTERN SETS UP
WITH NO DEFINITE BOUNDARIES AROUND THROUGH THE PERIOD. THE BEST
CHANCE FOR PRECIPITATION WILL COME SUNDAY NIGHT...AND AGAIN MONDAY
NIGHT INTO TUESDAY WHEN THE UPPER LEVEL SHORTWAVES IN THE AREA WILL
LEND THE MOST SUPPORT. TEMPERATURES WILL REMAIN RIGHT AROUND NORMAL
WITH H85 TEMPS IN THE TEENS TO MID 20S.  PARKIN

.ABR...NONE.

Hazardous weather outlook, Jul 29, 3:18 PM CDT, 1 hour 22 minutes before

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-301030-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ABERDEEN SD
318 PM CDT TUE JUL 29 2003

.SEVERE THUNDERSTORM WATCH UNTIL 700 PM THIS EVENING...

.DAY ONE...TONIGHT...
A COLD FRONT CROSSING THE AREA THIS EVENING WILL GENERATE SEVERE
THUNDERSTORMS THIS EVENING UNTIL 700 PM.  SOME OF THESE STORMS WILL
PRODUCE LARGE HAIL AND DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TONIGHT.

In the hours before

Local storm report, Jul 29, 1:39 PM CDT, 3 hours 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN, SD
139 PM CDT TUE JUL 29 2003

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0130 PM    7 SW MILLER               SD   .75 INCH HAIL
07/29/03   HAND

AP

Local storm report, Jul 29, 1:52 PM CDT, 2 hours 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN, SD
152 PM CDT TUE JUL 29 2003

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0135 PM    1 S MILLER                SD   .75 INCH HAIL
07/29/03   HAND

0145 PM    3 N SAINT LAWRENCE        SD   1.00 INCH HAIL
07/29/03   HAND

AP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 2:35 PM CDT	Severe Thunderstorm Warning	ABR	Hughes, Stanley	40 min
Jul 29, 2:46 PM CDT	Severe Thunderstorm Warning	ABR	Codington	44 min
Jul 29, 2:50 PM CDT	Severe Thunderstorm Warning	ABR	Spink	40 min
Jul 29, 3:07 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hand, Spink	38 min
Jul 29, 3:10 PM CDT	Severe Thunderstorm Warning	ABR	Clark	50 min
Jul 29, 3:22 PM CDT	Tornado Warning	ABR	Spink	38 min
Jul 29, 4:00 PM CDT	Severe Thunderstorm Warning	ABR	Clark, Spink	45 min
Jul 29, 4:14 PM CDT	Severe Thunderstorm Warning	ABR	Codington, Grant	46 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2003 Every severe thunderstorm warning in 2003

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.