Alert archive / Missouri / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 87, NWS Kansas City, MO

April 20, 2001Andrew County, DeKalb County, Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Apr 20, 2001, 11:44 PM CDT for Andrew County, DeKalb County, Missouri. It was in force for 46 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Apr 20, 2001, 11:44 PM CDT (04:44 UTC)
Expired: Apr 21, 2001, 12:30 AM CDT
In force: 46 min
Issued by: NWS Kansas City, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Andrew County, MO, DeKalb County, MO

The radar

The Pleasant Hill radar (KEAX), 129 km from the middle of the area, began a volume at 04:43 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
Apr 21, 12:25 AM CDT	Hail 0.75	Weatherby, MO

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 20, 8:15 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 4.7 hours before the alert went out and 143 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: 2129 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 1308 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 204 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 8.9

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KEAX 210445
SVRMCI
MOC003-063-210530-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1144 PM CDT FRI APR 20 2001

THE NATIONAL WEATHER SERVICE IN PLEASANT HILL HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN ANDREW COUNTY IN NORTHWEST MISSOURI
  NORTHERN DEKALB COUNTY IN NORTHWEST MISSOURI

* UNTIL 1230 AM CDT

* AT 1144 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES NORTHEAST OF COSBY...OR ABOUT 17 MILES
  NORTHEAST OF ST JOSEPH...MOVING EAST AT 55 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  AMITY AT 1150 PM CDT
  FAIRPORT AT 1155 PM CDT
  WEATHERBY AT MIDNIGHT CDT

THIS SEVERE THUNDERSTORM WILL LIKELY PRODUCE DIME SIZE HAIL...AND
WINDS IN EXCESS OF 60 MPH. FOR YOUR SAFETY...MOVE INDOORS AND STAY
AWAY FROM WINDOWS. REMEMBER...LIGHTNING IS A THREAT FROM ALL
THUNDERSTORMS. HEAVY RAI NS CAN CAUSE LOCALIZED FLOODING OF LOW LYING
AREAS.

LAT...LON 4004 9472 3982 9471 3985 9423 4003 9425

93

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 Apr 20, 2:50 PM CDT, 8 hours 54 minutes earlier.

Area forecast discussion, Apr 20, 2:50 PM CDT, 8 hours 54 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
250 PM CDT FRI APR 20 2001

NOTHING EASY WITH THIS FCST PKG THRU MON. FNTL BNDRY FM NE IA THRU
SW IA AND THEN ALG KS/NEB BDR WILL LIKELY BE ONE AREA TO FOCUS
INITIAL CNVTN...AS WELL AS SFC TROF EXTDG THRU CNTRL KS AND ERN TX
PNHDL. STG SHRTWV TRKG ACRS CO WILL AID RPD TSTM DVLPT LT THIS
AFTN/EVE. FTHR S MESO-ETA PICKED UP ON H7 VORT LOBE MOVG THRU OK.
ISOLD CNVTN SPROUTED UP OVR SE KS ON NOSE OF DEEPER MSTR AHD OF THIS
FEATURE. HWVR...AS NOTED ON 18Z SPECIAL SOUNDING TAKEN BY TOP THE
AMS IS CURRENTLY CAPPED...ALBIET MDTLY UNSTBL WITH VERY STEEP MID
LVL LAPSE RATES. VORT LOBE PROGD TO TRK INTO CNTRL MO WHERE APRNT
CNVTV FEEDBACK SHOWS UP SUGG CNVTN COULD INCR ACRS SRN CWA THIS EVE
AS LOBE MOVS THRU. FTHR N THINK BEST CHC FOR CNVTN WILL BE LT THIS
EVE AND WILL GO WITH HIEST POPS FAR NW WHERE INSTBY PROGD TO BE
GTST. WILL ALSO KEEP MENTION OF SVR THIS AREA. MIN TEMPS ABT SAME AS
THIS MRNG MOST AREAS.

QUESTIONS FOR TMRW WILL BE WHERE WILL OUTFLOW BNDRY/WK FNT FM TNGTS
STORMS END UP. ETA A BIT FTHR N THAN PREVIOUS RUNS AND MORE IN LN
WITH AVN WHICH HAS CHGD LTL OVR PAST CPL OF RUNS. SO PLACING BNDRY
NR A MCI S OF IRK LN SEEMS RSNBL. THIS BNDRY WILL THEN ACT TO FOCUS
STG/PSBL SVR TSTM DVLPMT LT SAT AFTN/EVE. MODELS SHOW NO CAP SO
ACTVTY COULD FIRE BY MID AFTN...SO WILL MAINTAIN CHC POPS FOR AFTN
HRS MOST OF CWA. TEMPS COULD BE TRICKY DUE TO LOC OF BNDRY...RAIN
COOLED AIR AND CLDS. FOR NOW WILL GO COOLER N OF BNDRY AND ABT THE
SAME S OF BNDRY. SHUD BE ACTV NGT SAT AND HVY RAIN COULD BE A
PROBLEM.

MAIN UPR SHRTWV PROGD TO COME OUT LT SUN. WIL%L CONT CHC POPS ON SUN
AND ONCE AGAIN GO LIKELY SUN NGT AS UPR SYS APCHS. PCPN SHUD CONT
INTO MON AS UPR SYS SHEARS OUT N OF CWA AND KEEPS FNT FM BLOWING
THRU TILL TUE.

.EAX...
KS....NONE.
MO...NONE.

JULY

In the hours before

Local storm report, Apr 20, 7:04 PM CDT, 4 hours 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
704 PM CDT FRI APR 20 2001

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0651 PM    2 N BENDENA               KS   .75 INCH HAIL
04/20/01   DONIPHAN                       REPORTED BY EMERGENCY
                                          MANAGEMENT.

0655 PM    TROY                      KS   .88 INCH HAIL
04/20/01   DONIPHAN                       REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0655 PM    3 NW CUMMINGS             KS   .75 INCH HAIL
04/20/01   ATCHISON                       REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

Local storm report, Apr 20, 7:42 PM CDT, 4 hours 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
742 PM CDT FRI APR 20 2001

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0705 PM    3 SE NEW PT               MO   .75 INCH HAIL
04/20/01   HOLT                           REPORTED BY PUBLIC.

0734 PM    3 E MARYVILLE             MO   1.75 INCH HAIL
04/20/01   NODAWAY                        REPORTE|D BY PUBLIC.

Local storm report, Apr 20, 7:49 PM CDT, 3 hours 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
749 PM CDT FRI APR 20 2001

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0745 PM    6 W PARNELL               MO   2.75 INCH HAIL
04/20/01   NODAWAY                        REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

Local storm report, Apr 20, 8:12 PM CDT, 3 hours 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
812 PM CDT FRI APR 20 2001

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0718 PM    3 SW FILLMORE             MO   1 INCH HAIL
04/20/01   ANDREW                         REPORTED BY PUBLIC.
                                          60 MPH WIND GUST

Local storm report, Apr 20, 9:42 PM CDT, 2 hours 2 minutes before

ZCZC STLLSRMCI ALL

TTAA00 KMCI DDHHMM

PRELIMINARY LOCAL STORM REPORT

NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO

942 PM CDT FRI APR 20 2001

TIME(CDT)  .....CITY LOCATION..... STATE   ...EVENT/REMARKS...

           ....COUNTY LOCATION....

0752 PM    3 NE SHERIDAN             MO    1.75 INCH HAIL

04/20/01   WORTH

NNNN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 7:16 PM CDT	Severe Thunderstorm Warning	EAX	Buchanan	44 min
Apr 20, 7:26 PM CDT	Severe Thunderstorm Warning	EAX	Nodaway	49 min
Apr 20, 7:45 PM CDT	Severe Thunderstorm Warning	EAX	Worth	45 min
Apr 21, 12:12 AM CDT	Severe Thunderstorm Warning	EAX	Platte	48 min
Apr 21, 12:26 AM CDT	Severe Thunderstorm Warning	EAX	Clay, Clinton	49 min
Apr 21, 1:14 AM CDT	Severe Thunderstorm Warning	EAX	Clay, Clinton	46 min

Nearby

Severe Thunderstorm Warnings in Missouri, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.