Alert archive / Kansas / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 54, NWS Topeka, KS
NWS Topeka, KS issued this severe thunderstorm warning at Apr 20, 2001, 6:18 PM CDT for Jefferson County, Kansas. It was in force for 17 min. No storm report in the archive falls 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.
The facts
- Issued
- Apr 20, 2001, 6:18 PM CDT (23:18 UTC)
- Expired
- Apr 20, 2001, 6:35 PM CDT
- In force
- 17 min
- Issued by
- NWS Topeka, KS
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Jefferson County, KS
The radar
The Topeka radar (KTWX), 83 km from the middle of the area, began a volume at 23:20 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
Topeka, KS (KTOP), launched 12:00Z, 11.3 hours before the alert went out and 46 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.
- Mixed-layer CAPE
- 651 J/kg
- Mixed-layer CIN
- -494 J/kg
- Mixed-layer LCL
- 717 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 179 m²/s²
- 0-3 km storm-relative helicity
- 177 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS53 KTOP 202318 SVRTOP KSC087-202335- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TOPEKA KS 618 PM CDT FRI APR 20 2001 THE NATIONAL WEATHER SERVICE IN TOPEKA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTH CENTRAL JEFFERSON COUNTY IN NORTHEAST KANSAS * UNTIL 635 PM CDT * AT 615 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER VALLY FALLS ... OR 25 MILES NORTHEAST OF TOPEKA MOVING NORTHEAST AT 40 MPH. * SOME LOCATIONS AFFECTED... NORTONVILLE LARGE HAIL IS LIKELY WITH THIS SEVERE THUNDERSTORM. IF YOU ARE IN THE PATH OF THE STORM...MOVE INDOORS. STAY TUNED TO NOAA WEATHER RADIO OR LOCAL MEDIA OUTLETS FOR THE LATEST SEVERE WEATHER INFORMATION. LAT...LON 3940 9549 3929 9541 3941 9523 3941 9536
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 Topeka, KS wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 20, 3:00 PM CDT, 3 hours 18 minutes earlier.
Area forecast discussion, Apr 20, 3:00 PM CDT, 3 hours 18 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TOPEKA KS 3 PM CDT FRI APR 20 2001 THUNDERSTORM CHANCES ARE MAIN FORECAST CONCERN THROUGH THE WEEKEND. LATEST SATELLITE SHOWING EXTENSIVE MID AND HIGH CLOUDS CONTINUING ACROSS THE REGION...WHICH MAY THIN OUT LATER...BUT SHOULD PERSIST THROUGH MUCH OF THE NIGHT. WARM FRONT HAS LIFTED NORTH INTO SOUTHERN NEBRASKA WITH DRYLINE EXTENDING SOUTHWESTWARD THROUGH WESTCENTRAL KANSAS. INITIAL SHORTWAVE MOVING ACROSS THE AREA WILL BE REPLACED BY STRONGER SHORTWAVE NOW MOVING THROUGH THE CENTRAL ROCKIES. VERY STRONG CAP IN PLACE ALTHOUGH BETTER POTENTIAL FOR CAP BEING BROKE LATER IN THE NIGHT AS WAVE LIFTS OUT AND TEMPORARY BACKING FLOW ALLOWS DEEPER LOW LEVEL MOISTURE TO RETURN. SOME POTENTIAL FOR CONVECTION TO DEVELOP EARLIER AHEAD OF DRYLINE. WILL KEEP POPS GOING ALL AREAS WITH HIGHER POPS AND BETTER SEVERE POTENTIAL ACROSS THE NORTH AND NORTHCENTRAL. AS SFC LOW MOVES OFF TO THE NORTHEAST EXPECT FRONT TO MOVE INTO THE CWA FROM WEST OVERNIGHT BUT NOT MAKE IT MUCH FURTHER SOUTHEAST THAN THE EASTCENTRAL AREAS. WOULD EXPECT THE POSSIBILITY OF MORE CONVECTION TO REDEVELOP ALONG AND NORTH OF BOUNDARY IN THE AFTERNOON OVER SOUTHERN 2/3 OF THE CWA WITH A BETTER CHANCE INTO THE NIGHT AS NEXT SHORTWAVE EMERGES FROM THE HIGH PLAINS. WILL INCREASE POPS ACROSS THE CWA SATURDAY NIGHT TO AROUND 50 PERCENT. MAIN UPPER LOW WILL BEGIN TO APPROACH THE AREA SUNDAY INTO SUNDAY NIGHT. EXTENSIVE CLOUDS AND SOME PRECIP WILL LIKELY HELP TO LIMIT HIGHS TEMPS. WILL GO WITH COMPROMISE OF COOLER FWC SATURDAY AND WARMER MAV/FAN FOR SUNDAY. WILL ALSO GO WITH LIKELY POPS SUNDAY NIGHT AS MAING UPPER LEVEL PUSH ENTERS THE CWA FROM WEST TO EAST. .TOP...NONE. 63
Nearby
Severe Thunderstorm Warnings in Kansas, 2001Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.