Alert archive / Iowa / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 109, NWS Sioux Falls, SD

July 13, 2006Woodbury County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 13, 2006, 3:02 PM CDT for Woodbury County, Iowa. It was in force for 13 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 13, 2006, 3:02 PM CDT (20:02 UTC)
Expired: Jul 13, 2006, 3:15 PM CDT
In force: 13 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

County Woodbury County, IA

The radar

The Omaha radar (KOAX), 122 km from the middle of the area, began a volume at 20:03 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 13, 12:21 PM CDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 8.0 hours before the alert went out and 122 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: 1747 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 968 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 168 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 Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 13, 3:00 PM CDT, 2 minutes earlier.

Area forecast discussion, Jul 13, 3:00 PM CDT, 2 minutes before

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST
IA...CORRECTED
NATIONAL WEATHER SERVICE SIOUX FALLS SD
300 PM CDT THU JUL 13 2006

.DISCUSSION...
COLD FRONT WORKING THROUGH THE CWA WITH THUNDERSTORMS AHEAD OF THE
SURFACE TROUGH...SOME OF THESE STORMS ARE SEVERE. THESE STORMS WILL
MOVE EAST INTO CENTRAL MN AND IA BY EARLY THIS EVENING. MORE
SURFACE BASED ACTIVITY MAY DEVELOP ALONG THE JAMES RIVER VALLEY THIS
AFTERNOON. ANY NEW STORM DEVELOPMENT SHOULD SEE VIGOROUS UPDRAFTS
WITH STEEP MID LEVEL LAPSE RATES BECOMING SEVERE WITH LARGE HAIL AND
DAMAGING WINDS.  HODOGRAPHS SUPPORTING LEFT MOVING SUPERCELLS...BUT
WITH DRY AIR IN THE LOW LEVELS STORMS MAY BECOME OUTFLOW DOMINANT
RELATIVELY QUICKLY WITH STRONG COLD POOLS. DRY AIR WILL FILTER INTO
WESTERN PORTIONS OF THE CWA BEHIND FRONT AND HAVE SIDED WITH COOLER
GUIDANCE VALUES IN THE WEST.

THROUGH THE REMAINDER OF THE FORECAST PERIOD...HOT AND DRY. WITH THE
DRIER AIR AND CLEAR SKIES...TEMPERATURES WILL REACH MAX MIXING
POTENTIAL TOMORROW UNDER LIGHT NW FLOW. TEMPERATURES WILL BE EVEN
WARMER THIS WEEKEND AS CENTER OF UPPER RIDGE WILL BE IN PLACE ACROSS
THE UPPER NORTHERN PLAINS. MAY NEED TO ISSUE A HEAT ADVISORY DURING
THE WEEKEND AS THE HEAT INDEX WILL LIKELY MAX OUT ON BOTH SAT AND
SUN BETWEEN 100 TO 110 DEGREES ACROSS MOST OF THE FA. A WEAK FRONTAL
BOUNDARY WILL DROP SOUTH OUT OF CANADA ON SUN NIGHT AND MAY BRING
A BRIEF COOL DOWN EARLY THIS WEEK...HOWEVER HIGH TEMPS WILL STILL
LIKELY REACH INTO THE 90S. UNFORTUNATELY WITH RIDGE IN PLACE THE
POTENTIAL FOR MUCH NEEDED RAIN WILL BE FEW AND FAR BETWEEN DURING
THE PERIOD.

VERY WARM TEMPERATURES...LOW RELATIVE HUMIDITIES...AND SW WINDS OF
15 TO 20 MPH WILL MAKE FOR EXTREME FIRE WEATHER DANGER INTO THE
JAMES RIVER VALLEY AND WESTWARD THIS WEEKEND...HOWEVER RED FLAG
CONDITIONS ARE NOT ANTICIPATED AT THIS TIME.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...SEVERE THUNDERSTORM WATCH FOR SE SD UNTIL 10 PM CDT.
MN...SEVERE THUNDERSTORM WATCH FOR SW MN UNTIL 10 PM CDT.
IA...SEVERE THUNDERSTORM WATCH FOR NW IA UNTIL 10 PM CDT.
NE...SEVERE THUNDERSTORM WATCH FOR EXTREME NE NEBRASKA UNTIL 10 PM
CDT.

&&

LIEBL/TEMEYER

Hazardous weather outlook, Jul 13, 11:23 AM CDT, 3 hours 39 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1123 AM CDT THU JUL 13 2006

SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-
IAZ001>003-012>014-020>022-031-032-NEZ013-014-141200-
AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA-
CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE-
DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON-
IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN-
LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN-
OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN-
SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON-
1123 AM CDT THU JUL 13 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA...
SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS...
A FEW THUNDERSTORMS WILL OCCUR WEST OF THE INTERSTATE 29 CORRIDOR
THROUGH THE EARLY AFTERNOON HOURS. THESE THUNDERSTORMS ARE NOT
EXPECTED TO BE SEVERE. SCATTERED THUNDERSTORMS WILL REDEVELOP
ALONG THE JAMES RIVER VALLEY THIS AFTERNOON AND THEN SPREAD EAST
THIS EVENING. SOME OF THESE STORMS WILL BECOME SEVERE WITH LARGE
HAIL AND STRONG STRAIGHT LINE WINDS THE MAIN THREAT.

FIRE DANGER...
THE GRASSLAND FIRE DANGER INDEX WILL REACH THE VERY HIGH CATEGORY
NEAR THE MISSOURI RIVER OF SOUTH CENTRAL SOUTH DAKOTA THIS
AFTERNOON.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

VERY HOT TEMPERATURES WILL GRADUALLY EXPAND ACROSS THE REGION
THROUGH THIS WEEKEND...WITH THE HOTTEST TEMPERATURES EXPECTED ON
SATURDAY AND SUNDAY. HIGH TEMPERATURES BOTH SATURDAY AND SUNDAY
WILL VARY FROM THE 90S EAST OF INTERSTATE 29 TO 100 TO 108
DEGREES WEST OF INTERSTATE 29. THESE HOT TEMPERATURES COMBINED
WITH THE RELATIVE HUMIDITY WILL PRODUCE HEAT INDICES OF 100 TO
110 DEGREES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 3 PM ALONG THE JAMES
RIVER VALLEY AND AFTER 5 PM EAST OF THE INTERSTATE 29 CORRIDOR.

&&

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT
WWW.CRH.NOAA.GOV/FSD. THIS INCLUDES THE GRAPHICAL HAZARDOUS
WEATHER OUTLOOK.

BT

In the hours before

Local storm report, Jul 13, 2:16 PM CDT, 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
216 PM CDT THU JUL 13 2006

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

0205 PM     HAIL             5 N SIOUX CITY          42.57N 96.39W
07/13/2006  M0.88 INCH       PLYMOUTH           IA   CO-OP OBSERVER

            COOP OBSERVER LOCATED 1NE OF JAMES. HEAVY RAINFALL AND
            NICKLE SIZE HAIL.

&&

DMORIN

Local storm report, Jul 13, 2:46 PM CDT, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
246 PM CDT THU JUL 13 2006

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

0243 PM     HAIL             ANTHON                  42.39N 95.87W
07/13/2006  E0.88 INCH       WOODBURY           IA   TRAINED SPOTTER

&&

BT

Local storm report, Jul 13, 2:59 PM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
259 PM CDT THU JUL 13 2006

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

0206 PM     HAIL             3 NE SIOUX CITY         42.53N 96.35W
07/13/2006  E0.75 INCH       WOODBURY           IA   PUBLIC

&&

DMORIN

Local storm report, Jul 13, 3:01 PM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
301 PM CDT THU JUL 13 2006

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

0250 PM     HAIL             5 NE SIBLEY             43.45N 95.67W
07/13/2006  E0.88 INCH       OSCEOLA            IA   CO-OP OBSERVER

&&

BT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 4:31 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	44 min
Jul 13, 4:43 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Douglas	31 min
Jul 13, 4:57 PM CDT	Severe Thunderstorm Warning	FSD	Kingsbury	33 min
Jul 13, 5:10 PM CDT	Tornado Warning	FSD	Kingsbury	35 min
Jul 13, 1:58 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Woodbury	32 min
Jul 13, 2:35 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	25 min
Jul 13, 2:48 PM CDT	Severe Thunderstorm Warning	FSD	Osceola	23 min
Jul 13, 2:57 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Ida	33 min
Jul 13, 5:08 PM CDT	Severe Thunderstorm Warning	FSD	Clay	16 min
Jul 13, 4:14 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	31 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2006 Every severe thunderstorm warning in 2006

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.