Alert archive / Indiana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 140, NWS Northern Indiana

September 7, 2001DeKalb County, Steuben County, Indiana; Branch County, Michigan

NWS Northern Indiana issued this severe thunderstorm warning at Sep 7, 2001, 5:38 PM EST for DeKalb County, Steuben County, Indiana; Branch County, Michigan. It was in force for 52 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: Sep 7, 2001, 5:38 PM EST (22:38 UTC)
Expired: Sep 7, 2001, 6:30 PM EST
In force: 52 min
Issued by: NWS Northern Indiana
Area: Whole counties

Counties DeKalb County, IN, Steuben County, IN, Branch County, MI

The radar

The Northern Indiana radar (KIWX), 65 km from the middle of the area, began a volume at 22:41 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

Detroit, MI (KDTX), launched 12:00Z, 10.6 hours before the alert went out and 177 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: 195 J/kg
Mixed-layer CIN: -99 J/kg
Mixed-layer LCL: 1009 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 165 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.

516 
WUUS53 KIWX 072240
SVRFWA
INC033-151-MIC023-072330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTHERN INDIANA
538 PM EST FRI SEP 7 2001

THE NATIONAL WEATHER SERVICE IN NORTHERN INDIANA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DE KALB COUNTY IN INDIANA
  STEUBEN COUNTY IN INDIANA
  BRANCH COUNTY IN MICHIGAN

* UNTIL 630 PM EST(730 PM EDT)



* AT 538 PM EST(638 PM EDT)...NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED A LINE OF SEVERE THUNDERSTORMS ALONG A LINE EXTENDING
  FROM 3 MILES WEST OF UNION CITY TO 5 MILES SOUTHWEST OF ALTONA...  
  MOVING EAST AT 20 MPH. WIND DAMAGE HAS BEEN REPORTED WITH THESE    
  STORMS.

* SOME LOCATIONS IN THE PATH OF THIS LINE OF SEVERE THUNDERSTORMS...
  UNION CITY
  AUBURN
  WATERLOO
  COLDWATER
  ANGOLA
  ST. JOE

SEEK SHELTER INSIDE A STURDY BUILDING AWAY FROM WINDOWS. SEVERE
STORMS CAN PRODUCE DAMAGING WINDS AND DESTRUCTIVE HAIL.

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

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 Sep 7, 3:05 PM EST, 2 hours 33 minutes earlier.

Area forecast discussion, Sep 7, 3:05 PM EST, 2 hours 33 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTHERN INDIANA
305 PM EST FRI SEP 7 2001

TSRA OCCRNG ATTM ALONG IL/IN BRDR AHD OF S/W IN S IL. MESOETA BRINGS
THIS S/W NNE THIS EVE AND WKNS IT OVRNGT. MORE TSRA FROM SE IN INTO
WC OH ALSO MOVG NNE. MODELS AGREE QUITE WELL ON DVLPG AND MOVG
ANOTHER S/W ACRS NW IL TNGT AND INCR NLLJ TO 40 TO 50 KT FRM SW TO NE
IL. WL HV SCT WRDNG ACRS CWA TNGT.

MODELS CONT TO SLOW DWN PROGRESS OF SFC FNT TO OUR W AS POSITIVELY
TILTED MID/UPR TROF DIGS INTO PLAINS. SHORT-TERM MODELS PUSH SFC FNT
ONLY AS FAR E AS IN...WEAKENING IT SIGNIFICANTLY...THRU SUN.

NO BIG SWINGS IN ZFP POPS FRM PD TO PD WITH AMTS REMAINING WARM AND
MOIST AND DIFFICULTY OF ACCURATELY TIMING SHRT WVS.

CURRENT AVN RUN SIG DIFF FRM 24 HRS AGO. AT THE SFC IT DVLPS LO PRES
OVR SW US SAT EVE AND MOVS IT NE ALONG MS VLY TROF/FNT REACHING IN
EARLY MON MRNG...AND THEN KEEPING IT OVR IN/OH THRU TUE NGT. AT 5H
TROF STAYS TO OUR W THRU SUN NGT AS IT DAMPENS OUT...AND CUT-OFF LO
BREAKS OFF AND MEANDERS ACRS IN TUE AND WASHES OUT OVR OH WED. MRF
ALSO BREAKS OFF THIS SML LO BUT ZIPS IT THRU THE LKS AND E OF HERE BY
12Z TUE. AVN BRINGS STRONG VORT THRU MON NGT...MRF DVLPS VORT TOO BUT
BRINGS IT THRU ON MON. CURRENT OUTER PDS OF ZFP ARE DRY. WITH GREAT
RUN-TO-RUN AND MODEL-TO-MODEL INCONSISTENCIES AM LOATHE TO MAKE
DRASTIC CHANGES TO FAR PDS OF FCST...SO WL LEAVE DRY BUT WL CHNG
FRM PC TO CLDY/MSTLY CLDY MON-TUE.

MOS TEMPS LUK GD TNGT W...THO PERHAPS A BIT COOL E. MAXES TMRW LOOK
GD E AND A BIT COOL W.

.IWX...NONE.

12

In the hours before

Local storm report, Sep 7, 5:15 PM EST, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
515 PM EST FRI SEP 07 2001

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

0510 PM    THREE RIVERS              MI   WIND DAMAGE
09/07/01   ST.JOSEPH                      ABOUT A DOZEN TREES
                                          BLOWN DOWN

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 6:22 PM EST	Severe Thunderstorm Warning	IWX	Hillsdale	48 min

Nearby

Severe Thunderstorm Warnings in Indiana, 2001 Severe Thunderstorm Warnings in Michigan, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.