Alert archive / Kansas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 323, NWS Springfield, MO

July 12, 2009Bourbon County, Kansas

NWS Springfield, MO issued this severe thunderstorm warning at Jul 12, 2009, 4:06 AM CDT for Bourbon County, Kansas. It was in force for 39 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 12, 2009, 4:06 AM CDT (09:06 UTC)
Expired: Jul 12, 2009, 4:45 AM CDT
In force: 39 min
Issued by: NWS Springfield, MO
Area: Storm-based polygon

County Bourbon County, KS

The radar

The Pleasant Hill radar (KEAX), 118 km from the middle of the area, began a volume at 09:08 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

Springfield, MO (KSGF), launched 00:00Z, 9.1 hours before the alert went out and 141 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: 1460 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 1555 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 9.0

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 Springfield, MO wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 12, 2:30 AM CDT, 1 hour 36 minutes earlier.

Area forecast discussion, Jul 12, 2:30 AM CDT, 1 hour 36 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPRINGFIELD MO
230 AM CDT SUN JUL 12 2009

.DISCUSSION...

A ROUND OF SEVERE THUNDERSTORMS IMPACTED THE EASTERN OZARKS
YESTERDAY EVENING.  THESE STORMS DEVELOPED WITHIN A MOIST AND
EXPLOSIVE ENVIRONMENT...MOST LIKELY TRIGGERED BY A SAGGING FRONTAL
SYSTEM THAT CAUSED DEW POINTS AND INSTABILITY TO POOL ALONG IT.
OTHER CONVECTION WAS SAMPLED BY REGIONAL RADARS ACROSS CENTRAL AND
EASTERN KANSAS IN THE FORM OF NARROW SHOWERS.  THIS ACTIVITY WAS
DEVELOPING IN RESPONSE TO ISENTROPIC PRESSURE ADVECTION NORTH OF THE
FRONTAL SYSTEM.

FOR TODAY...A MOIST AND UNSTABLE ENVIRONMENT WILL ONCE AGAIN BE
OBSERVED AS TEMPERATURES CLIMB INTO THE MID AND UPPER 90S OVER
SOUTHEAST KANSAS.  COOLER TEMPERATURES ARE EXPECTED ACROSS THE REST
OF SOUTHERN AND CENTRAL MISSOURI...AN AREA WHERE CLOUD COVER WILL BE
MORE FREQUENT.  SHOWERS AND THUNDERSTORMS WILL ALSO DEVELOP ACROSS
SOUTHERN MISSOURI AS SOME INDICATIONS SUGGEST THAT PULSE CONVECTION WILL
LIKELY DEVELOP.  PARTICULARLY SINCE THE FRONTAL SYSTEM WILL HANG
ACROSS THE CWA THROUGH THE AFTERNOON HOURS...THIS FEATURE WILL ONLY
HELP TRIGGER UPDRAFTS.  SEVERE THUNDERSTORMS WILL BE POSSIBLE WITH
LARGE HAIL AND DAMAGING DOWNBURST WINDS POSSIBLE.

MODELS SHOW THAT THE OZARKS WILL REMAIN POSITIONED UNDER THE
NORTHEAST PERIPHERY OF THE SUMMERTIME HIGH THAT IS CURRENTLY
CENTERED OVER WESTERN TEXAS.  THIS AREA IS FAVORABLE FOR PERIODS OF
SHOWERS AND THUNDERSTORMS THROUGH MONDAY AND TUESDAY.  EVENTUALLY A
SLIGHT PATTERN CHANGE WILL OCCUR IN WHICH THE SUMMER RIDGE BECOMES
MORE BROAD ACROSS THE SOUTHERN CONUS...CREATING MORE OF A WEAK ZONAL
REGIME ACROSS SOUTHERN MISSOURI.  A FRONTAL BOUNDARY WILL ALSO
BECOME POSITIONED ALONG THE NORTHERN EDGE OF THE SUMMER
RIDGE...WHICH WILL SET UP SOMEWHERE ACROSS CENTRAL OR SOUTHERN
MISSOURI.  THIS FEATURE WILL LIKELY BECOME A FOCUS FOR CONVECTION
HEADING INTO THE WEDNESDAY THROUGH FRIDAY TIME FRAME.

BY THE END OF THE WEEK...MEDIUM RANGE SOLUTIONS SUGGEST THAT A MORE
INTENSE UPPER LOW WILL DEVELOP ACROSS THE GREAT LAKES.  THIS FEATURE
WILL CAUSE THE UPPER PATTERN OVER THE NATIONS MID SECTION TO EVOLVE
TOWARD NORTHWEST FLOW.   THIS REGIME WILL LIKELY ALLOW A MUCH COOLER
AND DRIER CONTINENTAL AIRMASS INTO THE REGION...BUT NOT BEFORE
TRIGGERING AN EPISODE OF DEEP AND POTENTIALLY INTENSE CONVECTION.

CRAMER

&&

.AVIATION...

VFR CONDITIONS ARE EXPECTED TO PERSIST INTO EARLY SUNDAY
AFTERNOON. THUNDERSTORM DEVELOPMENT WILL BE POSSIBLE ACROSS
EASTERN KANSAS LATE TONIGHT. THERE IS A SLIM CHANCE THAT SOME OF
THESE STORMS COULD MAKE IT INTO SOUTHWEST MISSOURI...BUT
CONFIDENCE IS TOO LOW TO INCLUDE IN TAFS AT THIS TIME. ADDITIONAL
THUNDERSTORM DEVELOPMENT IS EXPECTED SUNDAY AFTERNOON ACROSS
SOUTHWEST MISSOURI...BUT TIMING AND PLACEMENT REMAINS IN QUESTION.
THEREFORE WENT WITH A CB GROUP INTO SUNDAY EVENING. ONLY OTHER
IMPACT WILL BE LOW LEVEL WIND SHEAR LATE TONIGHT AND EARLY SUNDAY
MORNING.

SCHAUMANN

&&

.SGF WATCHES/WARNINGS/ADVISORIES...
MO...NONE.
KS...NONE.
&&

Hazardous weather outlook, Jul 12, 3:38 AM CDT, 28 minutes before

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In the hours before

Local storm report, Jul 11, 11:13 PM CDT, 4 hours 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPRINGFIELD MO
1113 PM CDT SAT JUL 11 2009

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

1111 PM     TSTM WND GST     WEST PLAINS             36.73N 91.85W
07/11/2009  E60.00 MPH       HOWELL             MO   LAW ENFORCEMENT

            ESTIMATED 50 TO 60 MPH WIND GUSTS.

&&

JSS

Local storm report, Jul 11, 11:51 PM CDT, 4 hours 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPRINGFIELD MO
1151 PM CDT SAT JUL 11 2009

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

1110 PM     TSTM WND DMG     WEST PLAINS             36.73N 91.85W
07/11/2009                   HOWELL             MO   LAW ENFORCEMENT

            WEST PLAINS POLICE AND FIRE HEADQUARTERS RELAYED TO THE
            NWS THAT A FEW AWNINGS HAD BEEN DAMAGED FROM THUNDERSTORM
            WIND GUSTS. ALSO...SIX POWER POLES WERE SNAPPED WITHIN
            THE CITY. QUARTER SIZE HAIL WAS ALSO OBSERVED.

&&

DCRAMER

Local storm report, Jul 12, 12:16 AM CDT, 3 hours 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPRINGFIELD MO
1216 AM CDT SUN JUL 12 2009

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

1214 AM     HAIL             WEST PLAINS             36.73N 91.85W
07/12/2009  E1.00 INCH       HOWELL             MO   LAW ENFORCEMENT

&&

DSA

Special weather statement, Jul 12, 1:23 AM CDT, 2 hours 43 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPRINGFIELD MO
123 AM CDT SUN JUL 12 2009

MOZ106-120700-
OREGON MO-
123 AM CDT SUN JUL 12 2009

...SIGNIFICANT WEATHER ALERT FOR SOUTHWESTERN OREGON COUNTY UNTIL 200
AM CDT...

AT 121 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR KOSHKONONG...OR 6 MILES WEST OF THAYER...
MOVING SOUTHEAST AT 25 MPH. NICKEL SIZE HAIL...AND WINDS AROUND 50
MPH ARE EXPECTED WITH THIS STORM.

THIS STORM WILL BE NEAR...
  THAYER BY 135 AM CDT.

LOCATIONS IMPACTED INCLUDE KOSHKONONG AND THAYER.

DSA

Special weather statement, Jul 12, 2:56 AM CDT, 1 hour 10 minutes before

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Local storm report, Jul 12, 3:59 AM CDT, 7 minutes before

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The office that day

Everything else NWS Springfield, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 11, 8:05 PM CDT	Severe Thunderstorm Warning	SGF	Texas	25 min
Jul 11, 8:23 PM CDT	Tornado Warning	SGF	Texas	22 min
Jul 11, 8:40 PM CDT	Tornado Warning	SGF	Howell, Shannon, Texas	35 min
Jul 11, 8:51 PM CDT	Severe Thunderstorm Warning	SGF	Texas, Wright	39 min
Jul 11, 8:58 PM CDT	Tornado Warning	SGF	Texas, Wright	26 min
Jul 11, 9:12 PM CDT	Tornado Warning	SGF	Howell, Oregon, Shannon	48 min
Jul 11, 9:26 PM CDT	Severe Thunderstorm Warning	SGF	Douglas, Howell, Texas, Wright	34 min
Jul 11, 9:56 PM CDT	Severe Thunderstorm Warning	SGF	Oregon	64 min
Jul 11, 10:22 PM CDT	Severe Thunderstorm Warning	SGF	Howell, Texas	38 min
Jul 11, 10:52 PM CDT	Flash Flood Warning	SGF	Oregon	6 hr
Jul 11, 11:00 PM CDT	Severe Thunderstorm Warning	SGF	Howell	75 min
Jul 11, 11:33 PM CDT	Tornado Warning	SGF	Howell	27 min
Jul 12, 12:13 AM CDT	Severe Thunderstorm Warning	SGF	Howell	51 min
Jul 12, 12:38 AM CDT	Severe Thunderstorm Warning	SGF	Oregon	28 min
Jul 12, 1:44 AM CDT	Flash Flood Warning	SGF	Howell	3 hr
Jul 12, 2:46 AM CDT	Flash Flood Warning	SGF	Ozark	3 hr
Jul 12, 4:56 AM CDT	Areal Flood Warning	SGF	Howell, Oregon, Ozark	5 hr

Nearby

Severe Thunderstorm Warnings in Kansas, 2009 Every severe thunderstorm warning in 2009

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.