Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 318, NWS Kansas City, MO

August 18, 2011Johnson County, Leavenworth County, Wyandotte County, Kansas; 4 counties in Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Aug 18, 2011, 10:57 PM CDT for Johnson County, Leavenworth County, Wyandotte County, Kansas; 4 counties in Missouri. It was in force for 33 min. 16 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 18, 2011, 10:57 PM CDT (03:57 UTC)
Expired: Aug 18, 2011, 11:30 PM CDT
In force: 33 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 1.5 in
Wind: 70.0 mph

Counties Johnson County, KS, Leavenworth County, KS, Wyandotte County, KS, Cass County, MO, Clay County, MO, Jackson County, MO, Platte County, MO

The radar

The Pleasant Hill radar (KEAX), 49 km from the middle of the area, began a volume at 03:59 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 was reported inside it

Time	Report	Where	Remark
Aug 18, 11:03 PM CDT	TSTM WND GST 60	Lake Waukomis, MO	BLEW GAS GRILL 30 FEET ACROSS DECK
Aug 18, 11:03 PM CDT	TSTM WND GST 60	Lake Waukomis, MO	BLEW GAS GRILL 30 FEET ACROSS DECK
Aug 18, 11:06 PM CDT	TSTM WND GST 65	2 Ne Tonganoxie, KS	THUNDERSTORM WIND GUSTS ESTIMATED UP TO 65 MPH. TREE LIMBS REPORTED DOWN.
Aug 18, 11:07 PM CDT	HAIL 1.5	2 Ene Liberty, MO
Aug 18, 11:12 PM CDT	TSTM WND GST 60	6 N Kansas City, MO
Aug 18, 11:12 PM CDT	TSTM WND GST 70	4 Wnw Gladstone, MO
Aug 18, 11:14 PM CDT	TSTM WND DMG	2 W Kansas City, MO	NUMEROUS TENTS, TABLES AND CHAIRS FOR UPCOMING AIRSHOW BLOWN OVER OR DOWN.
Aug 18, 11:23 PM CDT	TSTM WND GST 59	Olathe, KS	IXD ASOS MEASURED THUNDERSTORM WIND GUST AT 59 MPH.
Aug 18, 11:25 PM CDT	TSTM WND GST 70	3 W Independence, MO
Aug 18, 11:25 PM CDT	TSTM WND GST 70	3 W Independence, MO
Aug 18, 11:25 PM CDT	HAIL 1	W Glenaire, MO
Aug 18, 11:31 PM CDT	TSTM WND GST 65	Gladstone, MO	ESTIMATED 60-65 MPH...ALSO QUARTER SIZE HAIL
Aug 18, 11:32 PM CDT	TSTM WND GST 0	Olathe, KS	THUNDERSTORM WIND GUSTS ESTIMATED UP TO 60 MPH.
Aug 18, 11:32 PM CDT	TSTM WND GST 60	Olathe, KS	THUNDERSTORM WIND GUSTS ESTIMATED UP TO 60 MPH.
Aug 18, 11:33 PM CDT	TSTM WND GST 60	4 S Basehor, KS
Aug 18, 11:34 PM CDT	TSTM WND GST 68	Olathe, KS	IXD ASOS MEASURED THUNDERSTORM WIND GUST AT 68 MPH.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 11 storm reports to this severe thunderstorm warning; the first came 6 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 18, 8:09 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 4.0 hours before the alert went out and 85 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: 3749 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1481 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 17.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

712 
WUUS53 KEAX 190357
SVREAX
KSC091-103-209-MOC037-047-095-165-190430-
/O.NEW.KEAX.SV.W.0318.110819T0357Z-110819T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1057 PM CDT THU AUG 18 2011

THE NATIONAL WEATHER SERVICE IN PLEASANT HILL HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JOHNSON COUNTY IN EAST CENTRAL KANSAS...
  SOUTHERN LEAVENWORTH COUNTY IN NORTHEAST KANSAS...
  WYANDOTTE COUNTY IN NORTHEAST KANSAS...
  NORTHWESTERN CASS COUNTY IN WEST CENTRAL MISSOURI...
  CLAY COUNTY IN WEST CENTRAL MISSOURI...
  JACKSON COUNTY IN WEST CENTRAL MISSOURI...
  SOUTHEASTERN PLATTE COUNTY IN WEST CENTRAL MISSOURI...

* UNTIL 1130 PM CDT

* AT 1054 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
  IN EXCESS OF 70 MPH...AND PING PONG BALL SIZE HAIL.  THESE STORMS
  WERE LOCATED ALONG A LINE EXTENDING FROM 6 MILES EAST OF TRIMBLE TO
  SMITHVILLE TO PARKVILLE TO WILLIAMSTOWN...AND MOVING SOUTHEAST AT
  50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RIVERSIDE...BONNER SPRINGS...EDWARDSVILLE...KEARNEY...GLADSTONE...
  KANSAS CITY KANSAS...LAKE QUIVIRA...NORTH KANSAS CITY...CLAYCOMO...
  LIBERTY...DE SOTO...KANSAS CITY...SHAWNEE...MERRIAM...WESTWOOD...
  MISSION...FAIRWAY...MISSION HILLS...PRAIRIE VILLAGE AND OVERLAND
  PARK.

AT 1023 PM...AMATEUR RADIO OPERATORS REPORTED QUARTER SIZE HAIL SOUTH
OF ST JOSEPH.
AT 1025 PM...LOCAL LAW ENFORCEMENT REPORTED QUARTER SIZE HAIL SOUTH
OF ST. JOSEPH.
AT 1031 PM...TRAINED WEATHER SPOTTERS REPORTED A 70 MPH WIND GUST 1
MILE EAST OF ST. JOSEPH.
AT 1044 PM...LOCAL EMERGENCY MANAGEMENT REPORTED A 50 MPH WIND GUST 4
MILES NORTH OF LEAVENWORTH.
AT 1047 PM...TRAINED WEATHER SPOTTERS REPORTED A 60 MPH WIND GUST IN
CAMERON.
AT 1050 PM...TRAINED WEATHER SPOTTERS REPORTED QUARTER SIZE HAIL IN
DEARBORN.
AT 1045 PM...TRAINED WEATHER SPOTTERS REPORTED PENNY SIZE HAIL IN
DEARBORN.

A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT FRIDAY MORNING
FOR NORTHWESTERN MISSOURI.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS HAVE A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

INTENSE SQUALL LINES CAN OCCASIONALLY PRODUCE BRIEF TORNADOES IN
ADDITION TO WIDESPREAD SIGNIFICANT WIND DAMAGE. ALTHOUGH NOT
IMMEDIATELY LIKELY...FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON
THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. THIS STORM HAS THE
POTENTIAL TO CAUSE SERIOUS INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

&&

LAT...LON 3912 9519 3920 9479 3941 9461 3946 9454
      3945 9444 3925 9421 3921 9421 3921 9417
      3918 9419 3916 9412 3912 9410 3879 9440
      3874 9506 3898 9506 3898 9508 3895 9508
      3898 9516 3896 9519
TIME...MOT...LOC 0357Z 324DEG 44KT 3943 9443 3933 9455
          3914 9472 3905 9522
WIND...HAIL 70MPH 1.50IN

$$

MJ

1 follow-up statement

048 
WWUS53 KEAX 190425
SVSEAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1125 PM CDT THU AUG 18 2011

KSC091-103-209-MOC037-047-095-165-190430-
/O.CON.KEAX.SV.W.0318.000000T0000Z-110819T0430Z/
LEAVENWORTH KS-JOHNSON KS-WYANDOTTE KS-CASS MO-CLAY MO-JACKSON MO-
PLATTE MO-
1125 PM CDT THU AUG 18 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR JOHNSON COUNTY
IN EAST CENTRAL KANSAS...AND WYANDOTTE AND SOUTHERN LEAVENWORTH
COUNTIES IN NORTHEAST KANSAS...AND SOUTHEASTERN PLATTE...JACKSON...
CLAY AND NORTHWESTERN CASS COUNTIES IN WEST CENTRAL MISSOURI UNTIL
1130 PM CDT...

AT 1124 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS 
IN EXCESS OF 80 MPH...AND PING PONG BALL SIZE HAIL.  THESE STORMS 
WERE LOCATED ALONG A LINE EXTENDING FROM EXCELSIOR SPRINGS TO 
COURTNEY TO RAYTOWN TO 5 MILES SOUTHEAST OF EUDORA...MOVING SOUTHEAST
AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  LEAWOOD...INDEPENDENCE...COURTNEY...OLATHE...GARDNER...GRANDVIEW...
  LEE'S SUMMIT...EDGERTON...BUCKNER...BLUE SPRINGS...BELTON...
  RAYMORE...GRAIN VALLEY...SIBLEY...LAKE TAPAWINGO...LEVASY...
  LACKMANS...UNITY VILLAGE...CLARE AND STANLEY.

THIS WILL IMPACT THE FOLLOWING INTERSTATES...

  I-70 IN MISSOURI BETWEEN MILE MARKERS 0 AND 24.
  I-70 IN KANSAS BETWEEN MILE MARKERS 410 AND 423.
  I-35 IN MISSOURI BETWEEN MILE MARKERS 0 AND 27.
  I-35 IN KANSAS BETWEEN MILE MARKERS 203 AND 235.
  I-635 BETWEEN MILE MARKERS 0 AND 12.
  I-435 LOOP FROM MILE MARKERS 0 TO 22...35 TO 83.
  I-29 BETWEEN MILE MARKERS 0 AND 13.
  I-470 BETWEEN MILE MARKERS 0 AND 16.

AT 1054 PM...AMATEUR RADIO OPERATORS REPORTED A 60 MPH WIND GUST 7 
MILES NORTH OF PLATTSBURG.
AT 1055 PM...LOCAL EMERGENCY MANAGEMENT REPORTED A 50 MPH WIND GUST
IN LEAVENWORTH.
AT 1056 PM...LOCAL EMERGENCY MANAGEMENT REPORTED PENNY SIZE HAIL IN
LEAVENWORTH.
AT 1101 PM...TRAINED WEATHER SPOTTERS REPORTED HALF DOLLAR SIZE HAIL
1 MILE NORTHWEST OF RIDGELY.
AT 1104 PM...AMATEUR RADIO OPERATORS REPORTED A 55 MPH WIND GUST IN
CAMERON.
AT 1100 PM...AMATEUR RADIO OPERATORS REPORTED A 50 MPH WIND GUST IN
GRAYSON.
AT 1106 PM...TRAINED WEATHER SPOTTERS REPORTED A 65 MPH WIND GUST 2
MILES NORTHEAST OF TONGANOXIE.
AT 1103 PM...AIRPLANE PILOT A 60 MPH WIND GUST IN LAKE WAUKOMIS.
AT 1112 PM...AMATEUR RADIO OPERATORS REPORTED A 60 MPH WIND GUST 6
MILES NORTH OF KANSAS CITY.
AT 1112 PM...TRAINED WEATHER SPOTTERS REPORTED A 70 MPH WIND GUST IN
RIDGELY.
AT 1118 PM...AMATEUR RADIO OPERATORS REPORTED A 60 MPH WIND GUST IN
TRIMBLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS.

INTENSE SQUALL LINES CAN OCCASIONALLY PRODUCE BRIEF TORNADOES IN
ADDITION TO WIDESPREAD SIGNIFICANT WIND DAMAGE. ALTHOUGH NOT
IMMEDIATELY LIKELY...FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON
THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. THIS STORM HAS THE
POTENTIAL TO CAUSE SERIOUS INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

&&

LAT...LON 3912 9519 3920 9479 3941 9461 3946 9454
      3945 9444 3925 9421 3921 9421 3921 9417
      3918 9419 3916 9412 3912 9410 3879 9440
      3874 9506 3898 9506 3898 9508 3895 9508
      3898 9516 3896 9519
TIME...MOT...LOC 0425Z 324DEG 44KT 3930 9425 3918 9440
          3900 9446 3889 9501
WIND...HAIL 80MPH 1.50IN

$$

MJ

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 18, 3:38 PM CDT, 7 hours 19 minutes earlier.

Area forecast discussion, Aug 18, 3:38 PM CDT, 7 hours 19 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
338 PM CDT THU AUG 18 2011

.DISCUSSION...

CONVECTIVE INITIATION HAS TAKEN PLACE ACROSS PORTIONS OF EASTERN
NEBRASKA AND WESTERN IOWA THIS AFTERNOON AS AN UPPER LEVEL SHORT
WAVE TROUGH INTERACTS WITH THE WARM/MOIST AIR MASS CURRENTLY IN PLACE.
STRONG TO SEVERE WEATHER HAS BEEN EXPERIENCED WITH THESE STORMS THUS
FAR WITH UPWARD OF SOFTBALL SIZE HAIL BEING REPORTED ACROSS
NORTHEAST NEBRASKA. AN AXIS OF STRONG TO EXTREME INSTABILITY
CURRENTLY EXISTS ACROSS SOUTHEASTERN NEBRASKA AND NORTHEAST KANSAS
WITH MODERATE INSTABILITY EXTENDING INTO NORTHWESTERN MISSOURI.
CURRENT AND FORECAST SHEAR PARAMETERS CONTINUE TO SUPPORT THE IDEA
OF AN ORGANIZED MCS DEVELOPING THIS AFTERNOON AND EVENING AND MOVING
SOUTH TO SOUTHEAST INTO PORTIONS OF EASTERN KANSAS AND MISSOURI.
GIVEN AFOREMENTIONED PARAMETERS IN PLACE...EXPECT A SEVERE THREAT TO
PERSIST INTO THE EVENING HOURS WITH DAMAGING WINDS AND LARGE HAIL
THE PRIMARY THREATS. SHOULD A WELL DEVELOPED MCS ORGANIZE...AN
ENHANCED DAMAGING WIND THREAT WOULD CERTAINLY BE POSSIBLE. ROUGH
TIMING WOULD BRING THIS COMPLEX ACROSS THE IOWA/MISSOURI STATE LINE
NEAR 00Z AND ROUGHLY TO A KANSAS CITY TO CHILLICOTHE LINE BY 03Z.
LATEST PROGS INDICATE INGREDIENTS TO BE IN PLACE TO MAINTAIN THE
COMPLEX INTO CENTRAL PORTIONS OF MISSOURI AND KANSAS TONIGHT.
ALSO...ADDITIONAL THUNDERSTORMS MAY BE POSSIBLE BEHIND THE INITIAL
COMPLEX AS THE LLJ STRENGTHENS THIS EVENING AIDING ISENTROPIC
ASCENT AND MUCAPE VALUES. WILL THEREFORE MAINTAIN POPS TO ACCOUNT
FOR THIS UNCERTAINTY THROUGH THE OVERNIGHT HOURS.

WHILE THERE MAY BE ONGOING CONVECTIVE ACTIVITY FRIDAY
MORNING...PRECIP SHOULD PROGRESS OUT OF THE FORECAST AREA WITH THE
REMAINDER OF FRIDAY AFTERNOON FAIRLY QUIET. ATTENTION WILL THEN TURN
OUT WEST AS THE TAIL END OF THE FRONTAL BOUNDARY STALLS AS SFC LOW
PRESSURE DEVELOPS ALONG THE CENTRAL HIGH PLAINS. EXPECT CONVECTION
TO DEVELOP ALONG THIS BOUNDARY DURING THE EVENING AS THE LLJ
INCREASES ACROSS KANSAS. THIS ACTIVITY MAY EVENTUALLY MOVE INTO THE
FORECAST AREA DURING THE OVERNIGHT HOURS FRIDAY NIGHT INTO SATURDAY
MORNING. ADDITIONAL THUNDERSTORMS WILL BE POSSIBLE SATURDAY ALONG
AND AHEAD OF THE SYNOPTIC COLD FRONT THAT WILL SAG SOUTHWARD ACROSS
THE MIDWEST.

DEROCHE

MEDIUM RANGE (SUNDAY-THURSDAY)...

MODELS IN MODEST DISAGREEMENT THROUGHOUT THE MEDIUM RANGE SO WILL
RELY ON MORE OF AN ENSEMBLE BLEND.  THAT SAID...LARGEST DIFFERENCE
IN THE BEGINNING PORTIONS OF THE FORECAST HINGES ON THE AMPLITUDE OF
SYNOPTIC TROUGH DIGGING INTO THE NE CONUS ON SUNDAY.  FEEL THAT THIS
TROUGH SHOULD PUSH HIGH PRESSURE FAR ENOUGH TO THE SOUTH THAT POPS
COULD BE REMOVED SUNDAY INTO MONDAY.

HOWEVER...AS HEIGHTS BUILD OVER THE WESTERN HALF OF THE CONUS...SOME
SIGNALS APPEAR THAT LEFT OVER ENERGY OFF THE CALIFORNIA COAST WILL
BEGIN TO CUT UNDER THE RIDGE BY MONDAY PULLING MOISTURE AND CHANCES
FOR PRECIP BACK TOWARDS THE AREA. GFS AS USUAL MORE BULLISH IN THIS
REGARDS...WITH THE LOWER RESOLUTION ECMWF SLOWER. GEFS ENSEMBLES
SUPPORT THE IDEA THAT THE OPERATIONAL GFS IS TOO AGGRESSIVE.

THIS SAID...WILL BUMP UP POPS FOR TUE/WED AS GEFS/NAEFS SUPPORT
INCREASED MID-LEVEL ENERGY ROTATING IN FROM THE PACIFIC NORTHWEST ON
RATHER BRISK NORTHWESTERLY FLOW PATTERN.  LINGERING MID-LEVEL ENERGY
SHOULD PRODUCE A HIGHER THAN CLIMATOLOGY CHANCE FOR PRECIP AS WELL
AS NEAR OR BELOW NORMAL TEMPS.

DUX

&&

.AVIATION...

VFR CONDITIONS EXPECTED ACROSS ALL TAF SITES THROUGH THIS AFTERNOON.
ATTENTION THEN TURNS TO AN ORGANIZED THUNDERSTORM COMPLEX EXPECTED TO
DEVELOP THIS AFTERNOON ACROSS SE SOUTH DAKOTA/NE NEBRASKA. THIS
COMPLEX IS EXPECTED TO MOVE SOUTHEAST THIS EVENING AND
TONIGHT...ROUGHLY ALONG THE MISSOURI RIVER. GUIDANCE STILL DIFFERING
ON TIMING AND HAVE KEPT PERSISTENCE AS A DECENT COMPROMISE. EXPECT
THE THUNDERSTORM ACTIVITY TO SLIDE SOUTH OF THE TERMINALS OVERNIGHT
WITH IMPROVING CONDITIONS BY THE MORNING HOURS.

DEROCHE

&&

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

WFO EAX

Hazardous weather outlook, Aug 18, 6:24 PM CDT, 4 hours 33 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
624 PM CDT THU AUG 18 2011

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-191145-
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-
624 PM CDT THU AUG 18 2011

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

.DAY ONE...TONIGHT

THUNDERSTORMS CURRENTLY DEVELOPING ACROSS EASTERN NEBRASKA AND
WESTERN IOWA WILL EVOLVE INTO A THUNDERSTORM COMPLEX THIS EARLY THIS
EVENING. THIS COMPLEX WILL MOVE THROUGH THE FORECAST AREA TONIGHT.
DAMAGING WINDS AND LARGE HAIL ARE THE PRIMARY THREATS. ISOLATED
TORNADOES ARE ALSO POSSIBLE THIS EVENING...MAINLY WEST OF A LINE FROM
PRINCETON TO ST JOSEPH. LOCALLY VERY HEAVY RAINFALL MAY CAUSE MINOR
RUNOFF PROBLEMS AND POSSIBLE FLOODING OF LOW-LYING AREAS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THUNDERSTORMS WILL EXIT NORTHEAST AND CENTRAL MISSOURI FRIDAY
MORNING WITH THE SEVERE WEATHER THREAT LOW AT THIS TIME.

THUNDERSTORMS ARE AGAIN POSSIBLE VERY LATE FRIDAY NIGHT INTO
SATURDAY AND AGAIN TUESDAY. THE SEVERE THREAT IS UNCERTAIN AT THIS
TIME...BUT IT APPEARS AT THIS TIME THAT THE STORMS MAY AT LEAST
PRODUCE SMALL HAIL AND STRONG WINDS AND LOCALLY HEAVY RAIN.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE TONIGHT. REPORTS OF HEAVY RAINFALL
ALSO WOULD BE APPRECIATED.

BEUSTERIEN

In the hours before

Local storm report, Aug 18, 10:45 PM CDT, 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1045 PM CDT THU AUG 18 2011

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

1044 PM     TSTM WND GST     4 N LEAVENWORTH         39.38N 94.92W
08/18/2011  E50 MPH          LEAVENWORTH        KS   EMERGENCY MNGR

&&

SF

Local storm report, Aug 18, 10:49 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1049 PM CDT THU AUG 18 2011

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

1047 PM     TSTM WND GST     CAMERON                 39.74N 94.24W
08/18/2011  E60 MPH          CLINTON            MO   TRAINED SPOTTER

            THUNDERSTORM WIND GUSTS ESTIMATED UP TO 60 MPH.

&&

GAMIS

Local storm report, Aug 18, 10:50 PM CDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1050 PM CDT THU AUG 18 2011

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

1050 PM     HAIL             DEARBORN                39.52N 94.77W
08/18/2011  E1.00 INCH       PLATTE             MO   TRAINED SPOTTER

&&

Local storm report, Aug 18, 10:52 PM CDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1052 PM CDT THU AUG 18 2011

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

1045 PM     HAIL             DEARBORN                39.52N 94.77W
08/18/2011  M0.75 INCH       PLATTE             MO   TRAINED SPOTTER

&&

GAMIS

Local storm report, Aug 18, 10:55 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1055 PM CDT THU AUG 18 2011

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

1054 PM     TSTM WND GST     7 N PLATTSBURG          39.67N 94.46W
08/18/2011  E60 MPH          CLINTON            MO   AMATEUR RADIO

&&

GAMIS

Local storm report, Aug 18, 10:56 PM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1056 PM CDT THU AUG 18 2011

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

1055 PM     TSTM WND GST     LEAVENWORTH             39.32N 94.92W
08/18/2011  E50 MPH          LEAVENWORTH        KS   EMERGENCY MNGR

            PEA-SIZED HAIL ALSO REPORTED

&&

SF

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 9:07 PM CDT	Severe Thunderstorm Warning	EAX	Doniphan	38 min
Aug 18, 9:32 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Doniphan	43 min
Aug 18, 10:15 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Doniphan	45 min
Aug 18, 10:33 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Leavenworth, Wyandotte	42 min
Aug 18, 11:13 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Leavenworth, Wyandotte	32 min
Aug 18, 11:20 PM CDT	Areal Flood Advisory	EAX	Atchison, Leavenworth, Wyandotte	6 hr
Aug 18, 11:30 PM CDT	Severe Thunderstorm Warning	EAX	Johnson, Leavenworth, Miami, Wyandotte	45 min
Aug 18, 11:53 PM CDT	Severe Thunderstorm Warning	EAX	Johnson, Miami	37 min
Aug 19, 12:09 AM CDT	Areal Flood Advisory	EAX	Johnson	6 hr
Aug 19, 12:19 AM CDT	Severe Thunderstorm Warning	EAX	Linn, Miami	56 min
Aug 19, 12:33 AM CDT	Severe Thunderstorm Warning	EAX	Miami	42 min
Aug 19, 12:42 AM CDT	Areal Flood Advisory	EAX	Miami	5 hr
Aug 19, 1:24 AM CDT	Severe Thunderstorm Warning	EAX	Linn	36 min
Aug 18, 7:01 PM CDT	Severe Thunderstorm Warning	EAX	Nodaway	29 min
Aug 18, 7:28 PM CDT	Severe Thunderstorm Warning	EAX	Andrew, Gentry, Nodaway	32 min
Aug 18, 7:31 PM CDT	Special Weather Statement	EAX	Harrison, Worth	29 min
Aug 18, 7:51 PM CDT	Severe Thunderstorm Warning	EAX	Andrew, Daviess, DeKalb, Gentry, Harrison, Nodaway	24 min
Aug 18, 8:14 PM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Clinton, Daviess, DeKalb, Gentry, Grundy and 3 more	46 min
Aug 18, 8:24 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Holt, Nodaway	51 min
Aug 18, 9:00 PM CDT	Special Weather Statement	EAX	Caldwell	30 min
Aug 18, 10:44 PM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Clay, Clinton, Daviess, DeKalb, Gentry and 1 more	46 min
Aug 18, 11:17 PM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Carroll, Clay, Clinton, Daviess, Jackson and 3 more	43 min
Aug 18, 11:57 PM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Carroll, Chariton, Clay, Jackson, Johnson and 4 more	48 min
Aug 19, 12:31 AM CDT	Severe Thunderstorm Warning	EAX	Carroll, Cooper, Howard, Johnson, Lafayette, Pettis and 2 more	59 min
Aug 19, 12:59 AM CDT	Severe Thunderstorm Warning	EAX	Henry, Pettis	46 min
Aug 19, 1:16 AM CDT	Special Weather Statement	EAX	Bates	44 min
Aug 19, 1:19 AM CDT	Severe Thunderstorm Warning	EAX	Cooper, Howard, Johnson, Pettis, Saline	26 min
Aug 19, 1:44 AM CDT	Severe Thunderstorm Warning	EAX	Cooper, Pettis	31 min
Aug 19, 8:46 AM CDT	River Flood Warning	EAX	Atchison, Holt	7 hr
Aug 19, 11:47 AM CDT	River Flood Warning	EAX	Cooper	22 hr

Nearby

Severe Thunderstorm Warnings in Missouri, 2011 Severe Thunderstorm Warnings in Kansas, 2011 Every severe thunderstorm warning in 2011

Sources

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