Alert archive / Michigan / Tornado Warnings in 1998

Tornado Warning 6, NWS Detroit, MI

July 21, 1998Washtenaw County, Michigan

NWS Detroit, MI issued this tornado warning at Jul 21, 1998, 7:24 AM EDT for Washtenaw County, Michigan. It was in force for 66 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
Jul 21, 1998, 7:24 AM EDT (11:24 UTC)
Expired
Jul 21, 1998, 8:30 AM EDT
In force
66 min
Issued by
NWS Detroit, MI
Area
Whole counties

County Washtenaw County, MI

The radar

The Detroit radar (KDTX), 58 km from the middle of the area, began a volume at 11:25 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 00:00Z, 11.4 hours before the alert went out and 62 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-pSkew-T log-p diagram, Detroit, MI at 00:00Z on 1998-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Detroit, MI at 00:00Z on 1998-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
4 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
2132 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
45 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.

963 
WFUS01 KDTX 211126 RRA
TORDTX
MIC161-211230-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
724 AM EDT TUE JUL 21 1998

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A

* TORNADO WARNING FOR...
  WASHTENAW COUNTY IN SOUTHEASTERN LOWER MICHIGAN

* UNTIL 830 AM EDT

* AT 722 AM EDT...  NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A DEVELOPING TORNADO 37 MILES WEST OF ANN ARBOR OR 23 MILES WEST
  OF CHELSEA MOVING EAST AT 40 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  CHELSEA                       BY 755 AM EDT
  MANCHESTER                    BY 755 AM EDT
  DEXTER                        BY 805 AM EDT
  ANN ARBOR                     BY 815 AM EDT


IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IN A HOME OR
BUSINESS IS AN INTERIOR ROOM ON THE LOWEST FLOOR POSSIBLE.  AVOID
WINDOWS.


STRUBLE

The office that day

Everything else NWS Detroit, MI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 21, 7:32 AM EDTSevere Thunderstorm WarningDTXLenawee58 min
Jul 21, 8:12 AM EDTSevere Thunderstorm WarningDTXMonroe33 min
Jul 21, 5:23 PM EDTSevere Thunderstorm WarningDTXLivingston37 min
Jul 21, 5:33 PM EDTSevere Thunderstorm WarningDTXWashtenaw57 min
Jul 21, 5:38 PM EDTSevere Thunderstorm WarningDTXLenawee57 min
Jul 21, 5:48 PM EDTSevere Thunderstorm WarningDTXOakland42 min
Jul 21, 5:56 PM EDTSevere Thunderstorm WarningDTXMonroe, Wayne64 min
Jul 21, 5:56 PM EDTSevere Thunderstorm WarningDTXMacomb64 min
Jul 21, 6:39 PM EDTSevere Thunderstorm WarningDTXSaint Clair31 min

Nearby

Tornado Warnings in Michigan, 1998Every tornado warning in 1998Tornadoes in 1998

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.