Alert archive / Indiana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 26, NWS Northern Indiana

April 23, 2001Cass County, Indiana

NWS Northern Indiana issued this severe thunderstorm warning at Apr 23, 2001, 2:46 PM EST for Cass County, Indiana. It was in force for 34 min. 2 reports 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 23, 2001, 2:46 PM EST (19:46 UTC)
Expired: Apr 23, 2001, 3:20 PM EST
In force: 34 min
Issued by: NWS Northern Indiana
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Cass County, IN

The radar

The Northern Indiana radar (KIWX), 93 km from the middle of the area, began a volume at 19:47 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 23, 3:06 PM EST	Thunderstorm Wind	Royal Center, IN	One large tree blown down across the road along 400N and US 35.
Apr 23, 3:08 PM EST	Thunderstorm Wind	Logansport, IN	Large tree blown down.

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 nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.8 hours before the alert went out and 194 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: 47 J/kg
Mixed-layer CIN: -272 J/kg
Mixed-layer LCL: 988 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 250 m²/s²
0-3 km storm-relative helicity: 297 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KIWX 231948
SVRFWA
INC017-232020-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTHERN INDIANA
246 PM EST MON APR 23 2001

THE NATIONAL WEATHER SERVICE IN NORTHERN INDIANA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CASS COUNTY IN INDIANA

* UNTIL 320 PM EST

* AT 246 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 10 MILES SOUTHWEST OF LOGANSPORT...MOVING
  NORTHEAST AT 50 MPH.

* SOME LOCATIONS IN THE PATH OF THIS SEVERE THUNDERSTORM ARE...
  LOGANSPORT
  ADAMSBORO
  TWELVE MILE

WINDS IN EXCESS OF 60 MPH ARE LIKELY WITH THIS SEVERE STORM
SEEK SHELTER IMMEDIATELY

THIS STORM BLEW DOWN POWER LINES IN CARROLL COUNTY.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN NORTHERN INDIANA.

LAT...LON 4070 8666 4056 8649 4062 8618 4089 8620
          4091 8641

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 Northern Indiana wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 23, 2:31 PM EST, 15 minutes earlier.

Area forecast discussion, Apr 23, 2:31 PM EST, 15 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTHERN INDIANA
231 PM EST MON APR 23 2001

FCST CHALLENGES ARE TSRA CHANCES AND SVR POTENTIAL FOR EARLY
TONIGHT...THEN CHC FOR SHOWERS ON WED.

88D NETWORK SHOWING SEVERAL LINES OF CONVECTION WORKING ACRS
RGN.  WRN MOST LINE OF CONVECTION WAS ALONG CDFNT...BISECTING IL.
EXTENSIVE AREA OF SC WAS BHND FNT.

ETA...NGM AND AVN IN GOOD AGREEMENT WITH BRINGING A SERIES OF WK
SHORTWAVES ACRS CWFA THRU F24...THOUGH AT F48...ETA A BIT FARTHER W
THAN AVN.  MORE SIGNIFICANTLY...AVN MUCH STRONGER WITH SHORTWAVE
DROPPING INTO BASE OF TROF AT F60 THAN ETA.  AT THE SFC...AVN
OFFERED A FASTER MOVEMENT WITH CDFNT THAN ETA AND NGM AND
VERIFIED BEST AT 18Z.  ETA AND NGM BOTH TRENDED FASTER WITH FNT...
ALSO GIVING CREDENCE TO FOLLOWING AVN SOLUTION.  WITH LOW LVL FORCING
ALONG CDFNT AND DIFLUENCE ALOFT UNDER RIGHT ENTRANCE RGN OF UPR
JET...SHOWERS AND TSRA WL WRK ACRS RGN TONIGHT.  BEST FORCING WL
EXIT ERN SXNS OF CWFA BY 03Z. JUST MARGINAL INSTABILITY...LI
VALUES OF MINUS 2 TO MINUS 4...BUT STRONG WND FIELD WITH VWP
INDICATING 55 KT WNDS AT 5K FT.  THUS...ISOLATED SVR STORMS STILL
POSSIBLE.  WL MONITOR DEVELOPMENT UP TO ZONE ISSUANCE BEFORE
DECIDING IF TO MENTION SVR IN ZONES.  WITH COLD AIR ALOFT AND
ABUNDANT LOW LVL MOISTURE...EXPECT CU/SC REDEVELOPMENT ON TUE.
LAKE EFFECT CLOUDS CAN ALSO BE EXPECTED GIVEN LMIC/85H TEMP
DIFFERENTIAL AROUND 10C.  WITH HI PRES RDG OVR RGN AND DRIER AIR
ADVECTING IN...WL GO WITH MOSTLY CLEAR SKIES TUE NIGHT.  WITH PVA
DUE TO SHORTWAVE DROPPING INTO RGN...WITH OPT FOR MOSTLY CLOUDY
WORDING WITH LOW CHC POPS FOR SHOWERS ON WED.  SKIES WL CLR WED
NIGHT AS RDG RETURNS.

NGM STARTING TO CATCH UP WITH BRINGING IN LOW LVL COLD AIR...BUT
STILL MAY BE A DEGREE OR TWO TOO WARM FOR TONIGHT.  WITH
CLOUDINESS...WL GO WITH COOLER MAV NUMBERS FOR TUE.  FWC AND AVN
NUMBERS IN EXCELLENT AGREEMENT FOR TUE NIGHT AND LOOK GOOD WITH
CLEARING SKIES AND LIGHT WND.  WL GO TOWARD COOLER MAV NUMBERS FOR
WED.

AS FOR EXTD...WL DROP MENTION OF SHOWERS ON SAT GIVEN ONLY WK
SHORTWAVE TOPPING RDG.

.IWX...NONE.

BARJENBRUCH

The office that day

Everything else NWS Northern Indiana issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 23, 2:59 PM EST	Severe Thunderstorm Warning	IWX	Fulton, Miami	21 min
Apr 23, 3:18 PM EST	Severe Thunderstorm Warning	IWX	Kosciusko	32 min

Nearby

Severe Thunderstorm Warnings in Indiana, 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.