Alert archive / Missouri / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 256, NWS Kansas City, MO

August 12, 2010Clay County, Jackson County, Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Aug 12, 2010, 2:06 PM CDT for Clay County, Jackson County, Missouri. It was in force for 24 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
Aug 12, 2010, 2:06 PM CDT (19:06 UTC)
Expired
Aug 12, 2010, 2:30 PM CDT
In force
24 min
Issued by
NWS Kansas City, MO
Area
Storm-based polygon
Hail
0.75 in
Wind
70.0 mph

Counties Clay County, MO, Jackson County, MO

The radar

The Pleasant Hill radar (KEAX), 40 km from the middle of the area, began a volume at 19:07 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.

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 Kansas City, MO wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 12, 2:05 PM CDT, 1 minute earlier.

Area forecast discussion, Aug 12, 2:05 PM CDT, 1 minute before
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Hazardous weather outlook, Aug 12, 1:00 PM CDT, 1 hour 6 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
100 PM CDT THU AUG 12 2010

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-131100-
ATCHISON KS-MIAMI-LINN KS-DONIPHAN-LEAVENWORTH-WYANDOTTE-JOHNSON KS-
ATCHISON MO-NODAWAY-WORTH-GENTRY-HARRISON-MERCER-PUTNAM-SCHUYLER-
HOLT-ANDREW-DE KALB-DAVIESS-GRUNDY-SULLIVAN-ADAIR-BUCHANAN-CLINTON-
CALDWELL-LIVINGSTON-LINN MO-MACON-PLATTE-CLAY-RAY-CARROLL-CHARITON-
RANDOLPH-JACKSON-LAFAYETTE-SALINE-HOWARD-CASS-JOHNSON MO-PETTIS-
COOPER-BATES-HENRY-
100 PM CDT THU AUG 12 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST...NORTH CENTRAL AND
WEST CENTRAL MISSOURI...AS WELL AS EXTREME EASTERN KANSAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT

 VERY HOT AND HUMID CONDITIONS WILL CONTINUE THIS AFTERNOON...WITH
 TEMPERATURES CLIMBING INTO THE MIDDLE 90S ACROSS NORTHEAST
 MISSOURI...TO THE LOWER 100S ACROSS WEST CENTRAL MISSOURI AND EAST
 CENTRAL KANSAS. HEAT INDICES WILL BE AT THEIR GREATEST BETWEEN NOON
 AND 6 PM... AND GENERALLY WILL RANGE FROM 105 TO 115. AN EXCESSIVE
 HEAT WARNING REMAINS IN EFFECT THROUGH FRIDAY.

 IN ADDITION...WIDELY SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP
 AFTER 1 PM ALONG AND WEST OF A ST. JOSEPH TO WARRENSBURG LINE...
 INCLUDING THE KANSAS CITY METRO. CONDITIONS ARE ONCE AGAIN
 FAVORABLE FOR ISOLATED SEVERE WEATHER IN THE FORM OF DAMAGING
 DOWNBURST WINDS OF 60 TO 80 MPH. THUNDERSTORM CHANCES WILL DIMINISH
 QUICKLY AFTER SUNSET.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

 THE OPPRESSIVE HEAT AND HUMIDITY WILL LINGER THROUGH FRIDAY ACROSS
 THE ENTIRE OUTLOOK AREA. THE HEAT MAY LINGER GENERALLY SOUTH OF
 LINE FROM PAOLA KANSAS TO SEDALIA MISSOURI THROUGH SATURDAY.
 HIGH TEMPERATURES AGAIN WILL RANGE FROM THE MIDDLE 90S ACROSS
 NORTHEAST MISSOURI TO THE LOWER 100S ACROSS EAST CENTRAL KANSAS AND
 WEST CENTRAL MISSOURI. THESE HOT TEMPERATURES COMBINED WITH HIGH
 HUMIDITY WILL LEAD TO AFTERNOON HEAT INDICES GENERALLY RANGING FROM
 105 TO 115 DEGREES EACH AFTERNOON. ADDITIONALLY...OVERNIGHT LOWS
 WILL REMAIN VERY WARM THROUGH THIS STRETCH OF EXCESSIVE
 HEAT...WHICH WILL RESULT IN LITTLE NIGHTTIME RELIEF FROM THE HOT AND
 HUMID CONDITIONS.

 A POTENT LATE SUMMER COLD FRONT WILL MOVE INTO THE OUTLOOK AREA
 FRIDAY NIGHT INTO SATURDAY...BRINGING BETTER CHANCES OF
 THUNDERSTORMS TO THE REGION AND AN END TO THE OPPRESSIVE HEAT.

 STRONG TO SEVERE STORMS ARE POSSIBLE WITH THE FRONTAL BOUNDARY...
 WITH DAMAGING WINDS THE PRIMARY RISK FRIDAY EVENING INTO EARLY
 SATURDAY MORNING ACROSS THE ENTIRE OUTLOOK AREA. ADDITIONAL SEVERE
 WEATHER MAY BE POSSIBLE ACROSS CENTRAL MISSOURI ON SATURDAY.

.SPOTTER INFORMATION STATEMENT...

 SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EARLY THIS
 EVENING ACROSS FAR WESTERN MISSOURI AND ADJACENT EASTERN KANSAS.
 SPOTTERS MAY ALSO BE NEEDED FRIDAY EVENING INTO EARLY SATURDAY
 MORNING ACROSS THE ENTIRE OUTLOOK AREA...AND ACROSS CENTRAL
 MISSOURI ON SATURDAY.

BOOKBINDER

In the hours before

Local storm report, Aug 12, 10:42 AM CDT, 3 hours 24 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1042 AM CDT THU AUG 12 2010

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

0615 PM     DOWNBURST        3 E LEES SUMMIT         38.92N 94.33W
08/11/2010                   JACKSON            MO   NWS EMPLOYEE

            A SERIES OF WET MICROBURSTS IMPACTED SOUTHEAST PORTIONS
            OF LEES SUMMIT BETWEEN 615 AND 630 PM...WITH DAMAGE
            FOCUSED IN AN AREA BETWEEN HIGHWAY 50 AND LANSGFORD
            RD...EAST OF TODD GEORGE ROAD. SEVERAL DOZEN TREES WERE
            SNAPPED...CAUSING SECONDARY DAMAGE TO FENCES AND SEVERAL
            HOMES. DAMAGE WAS ALSO NOTED TO ROOF SHINGLES AND HOME
            SIDING. WIND SPEEDS ARE ESTIMATED TO HAVE REACHED BETWEEN
            70 AND 80 MPH.

&&

BOOKBINDER
Special weather statement, Aug 12, 1:35 PM CDT, 31 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
135 PM CDT THU AUG 12 2010

MOZ029-121900-
CLAY MO-
135 PM CDT THU AUG 12 2010

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL CLAY COUNTY UNTIL 200 PM
CDT...

AT 132 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR FERRELVIEW...OR 6 MILES NORTH OF
GLADSTONE...MOVING EAST AT 20 MPH.

WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  LIBERTY.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS... FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 3937 9441 3922 9441 3923 9461 3936 9461
TIME...MOT...LOC 1834Z 270DEG 16KT 3929 9457

CDB
Local storm report, Aug 12, 2:03 PM CDT, 3 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 11, 7:09 PM CDTSevere Thunderstorm WarningEAXCass, Jackson16 min
Aug 11, 8:07 PM CDTSpecial Weather StatementEAXLafayette38 min
Aug 11, 8:43 PM CDTSpecial Weather StatementEAXSaline47 min
Aug 11, 9:28 PM CDTSpecial Weather StatementEAXCooper62 min
Aug 11, 9:46 PM CDTSpecial Weather StatementEAXCooper44 min
Aug 12, 1:35 PM CDTSpecial Weather StatementEAXClay25 min
Aug 12, 1:56 PM CDTSevere Thunderstorm WarningEAXClay34 min
Aug 12, 2:31 PM CDTSevere Thunderstorm WarningEAXClay, Jackson, Ray29 min
Aug 11, 7:15 PM CDTSpecial Weather StatementEAXLinn45 min
Aug 11, 7:31 PM CDTFlash Flood WarningEAXLinn4 hr

Nearby

Severe Thunderstorm Warnings in Missouri, 2010Every severe thunderstorm warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.