Alert archive / South Dakota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 107, NWS Aberdeen, SD

July 14, 20014 counties in South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 14, 2001, 7:30 PM 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 14, 2001, 7:30 PM CDT (00:30 UTC)
Expired: Jul 14, 2001, 8:15 PM CDT
In force: 45 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

Counties Brown County, SD, Edmunds County, SD, Faulk County, SD, Spink County, SD

The radar

The Aberdeen radar (KABR), 35 km from the middle of the area, began a volume at 00:32 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 14, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.5 hours before the alert went out and 225 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: 1873 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 996 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -33 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -1.0

Open this sounding in Storm Lab

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 Aberdeen, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 14, 4:25 PM CDT, 3 hours 5 minutes earlier.

Area forecast discussion, Jul 14, 4:25 PM CDT, 3 hours 5 minutes before

AREA FORECAST DISCUSSION FOR CENTRAL/NORTHCENTRAL AND NORTHEAST
SOUTH DAKOTA AND WEST CENTRAL MINNESOTA
NATIONAL WEATHER SERVICE ABERDEEN SD
425 PM CDT SAT JUL 14 2001

MAIN FCST CHALLENGE IS BOUNDARY THAT HAS SAGGED A BIT FURTHER SOUTH
AND EAST DURING DAY. DWPTS CONT TO POOL NICELY ALONG FEATURE...AND
APPROACHING 7H VORT SHOULD ENSURE THAT CONVECTION CURRENTLY FIRING
ACROSS WRN CWA WILL REMAIN THROUGH EVENING. BIG CONCERN IS HOW FAR
EAST TSRA WILL PUSH. LATEST RUC...AS WELL AS AVN AND 18Z MESO-ETA
SHOWS TROUGH/BOUNDARY RETREATING BACK TO THE WEST OVERNIGHT...AND
LOSING A BIT OF ITS IDENTITY. 18Z RUC SHOWS THAT NVA REMAINS OVER
ERN CWA THROUGH NIGHT. ALSO OF NOTE...WINDS ACROSS ERN CWA ARE MORE
SWRLY INSTEAD OF SOUTH OR SOUTHEASTERLY...SO REAL HIGH DWPT AIR NOT
BEING PUSHED INTO CURRENT LINE OF TSRA. 8H JET GETS GOING TONIGHT
THAT WILL HELP WITH FORCING...AND LACK OF CAP WILL ENSURE THAT
ANYTHING THAT GETS GOING SHOULD STAY. WITH HIGH DWPTS ACRSS
EAST...LOWS SHOULD STAY UP TONIGHT.

FOR SUNDAY...PROBLEM DEALS WITH TROUGH SLIDING THROUGH. EVEN THO THE
ETA APPEARED TO INIT THE LEAD VORT SLIDING THROUGH TONIGHT...IT
HANDLED POORLY THE STRONGER VORT EJECTING OUT OF 4 CORNERS
NOW...WITH THE AVN DOING MUCH BETTER. 7H AND 5H TROFS PUSH INTO CWA
DURING DAY...BUT OMEGA FIELDS NOT ALL THAT IMPRESSIVE. 7H TEMPS WARM
WITH PASSAGE OF VORT TONIGHT. AVN KEEPS BOUNDARY TO OUR WEST...WHILE
THE ETA PUSHES FEATURE THROUGH DURING DAY. AM MORE INCLINED TO
FOLLOW AVN SOLN WITH ITS BETTER INIT OF VORT MAX. SFC LOW FORMS ON
SRN END OF TROUGH LATE IN THE DAY AND BEGINS TO EJECT TO THE EAST.
TSRA MAY FIRE LATER IN THE EVENING AS TROFS APPROACH.

FOR MONDAY...RIDGE BEGINS TO BUILD BACK INTO REGION WITH LAYERS
WARMING NICELY. PLENTY OF MID AND HIGH LEVEL CLOUDS AROUND TO ENSURE
PCLOUDY/PSUNNY CONDS.

FOR EXTENDED...DECENT WARMUP IN STORE THROUGH FIRST PART OF
FORECAST...AS RIDGE REBOUNDS NICELY AND LAYERS WARM. NO WELL DEFINED
WAVE SLIDING THROUGH AND WARM FRONT REMAINS WELL TO OUR NORTH. RIDGE
BEGINS TO FLATTEN ON THURSDAY AS STRONG 5H WRN LOW BEGINS TO EJECT
OVER RIDGE. SFC LOW FORMS ACROSS THE WEST WITH COLD FRONT TRAILING
SOUTH AND WEST. AS LOW MOVES TO THE EAST...INVERTED TROF TAKES SHAPE
ACROSS CWA LATER ON THURSDAY AND CONTS INTO FRIDAY. TROF PUSHES EAST
OF CWA ON SATURDAY...BUT STILL APPEARS THAT OVERRUNNING STRATIFORM
TYPE PCPN WILL LINGER INTO SATURDAY.

.ABR...SVR TSTORM WATCH FOR KMBG AND KPIR TIL 02Z.
       SVR TSTORM WATCH FOR KABR AND KATY TIL 03Z.

HINTZ

In the hours before

Local storm report, Jul 14, 7:16 PM CDT, 14 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 15, 3:14 AM CDT	Flash Flood Warning	ABR	Corson	3 hr
Jul 15, 5:20 PM CDT	Flash Flood Warning	ABR	Corson	3 hr

Nearby

Severe Thunderstorm Warnings in South Dakota, 2001 Every severe thunderstorm warning in 2001

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.