Alert archive / Michigan / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 111, NWS Detroit, MI

December 6, 1998Washtenaw County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Dec 6, 1998, 10:47 PM EST for Washtenaw County, Michigan. It was in force for 48 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Dec 6, 1998, 10:47 PM EST (03:47 UTC)
Expired: Dec 6, 1998, 11:35 PM EST
In force: 48 min
Issued by: NWS Detroit, MI
Area: Whole counties

County Washtenaw County, MI

What was reported inside it

Time	Report	Where	Remark
Dec 6, 11:08 PM EST	Thunderstorm Wind 52	Manchester, MI
Dec 6, 11:23 PM EST	Thunderstorm Wind 56	Ann Arbor, MI

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
Dec 6, 10:00 PM EST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 3.8 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-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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 631 m above ground
0-6 km bulk shear: 78 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Detroit, MI wrote its last area forecast discussion before this severe thunderstorm warning went out at Dec 6, 10:20 PM EST, 27 minutes earlier.

Area forecast discussion, Dec 6, 10:20 PM EST, 27 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MARQUETTE MI
1020 PM EST SUN DEC 6 1998

MAIN FCST CONCERNS LES POTENTIAL AND MIN TEMPS.

LOW PRES OVER SOUTHERN TIP OF LAKE MI WITH HIGH PRES CENTERED OVER
ND/MN BORDER.  MDLS INDICATE A LARGE AREA OF Q-VECTOR CONV BUT
OVERLAYING RH POINTS TO ALL SYNOPTIC SCALE PRECIP STAYING WELL SOUTH
AND EAST OF THE CWA OVERNIGHT. WILL REMOVE CHC -SN OVER SOUTH
CENTRAL ZONES.  SAT PICS SHOW AREA OF COOLING CLDS NORTH OF THE LOW
HAVING MOVED PASSED THE AREA. THUS CLDS OVERNIGHT SHOULD BE MOSTLY
LAKE GENERATED.  NEW ETA SHOWS AREA OF -12C TO -16C AT 850 TO BRUSH
ERN LAKE SUPERIOR. SFC TO 700 MB WINDS ALIGN FOR A FEW HRS FROM THE
NW LATE TNGHT.  SAT PICS ALSO SHOW CLD STREAMERS OFF OF LAKE NIPIGON
INDICATING THE AIRMASS IS COLD ENOUGH TO GENERATE SOME LES.  WILL
THUS EXPECT BEST THREAT OF SHSN OVER LUCE AND ALGER COUNTIES...WILL
BUMP POPS UP A LITTLE THEIR. TEMPS SLOW TO DROP THIS EVE AND NEW RUC
TEMPS ARE WARMER THEN OTHER MODEL TEMPS FCST.  CONSIDERING CLDS AND
STILL SOME BRISK WINDS I AM INCLINED TO UP MINS A LITTLE IN A COUPLE
OF THE ZONES BUT NOT AS MUCH AS THE RUC.  ALL IN ALL...NO MAJOR
CHANGES TO PREVIOUS PACKAGE.

LULOFS

In the hours before

Special weather statement, Dec 6, 10:20 PM EST, 27 minutes before

MIZ060>063-068>070-075-076-082-083-071200-

SEVERE WEATHER OUTLOOK FOR SOUTHEAST MICHIGAN
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1020 PM EST SUN DEC 6 1998

...SEVERE THUNDERSTORM WATCH IN EFFECT FOR SOUTHEAST MICHIGAN...

DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGERS IMMEDIATELY.
SPOTTER ACTIVATION MAY BE REQUIRED TONIGHT.

SCATTERED THUNDERSTORMS WILL OCCUR TONIGHT AND EARLY MONDAY MORNING
ACROSS SOUTHEAST LOWER MICHIGAN. SOME OF THESE THUNDERSTORMS MAY BE
SEVERE.

A LINE OF SHOWERS AND THUNDERSTORMS IS DEVELOPING ALONG AND AHEAD OF
A COLD FRONT STRETCHING FROM BAD AXE TO JACKSON. SOME OF THESE
STORMS MAY PRODUCE WINDS IN EXCESS OF 60 MPH.

THIS LINE IS MOVING EAST AT 40 MPH...AND WILL REACH FLINT BY 1045
PM...PONTIAC BY 11 PM...ANN ARBOR BY 11 PM...AND DETROIT BY 1115 PM.
THIS LINE IS NARROW AND THUNDERSTORM ACTIVITY SHOULD LAST FOR ONLY
ABOUT 30 MINUTES.

STAY TUNED TO THE NATIONAL WEATHER SERVICE FOR THE LATEST WEATHER
INFORMATION.

OKEEFE

Special weather statement, Dec 6, 10:20 PM EST, 27 minutes before

MIZ060>063-068>070-075-076-082-083-071200-

SEVERE WEATHER OUTLOOK FOR SOUTHEAST MICHIGAN
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1020 PM EST SUN DEC 6 1998

...SEVERE THUNDERSTORM WATCH IN EFFECT FOR SOUTHEAST MICHIGAN...

DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGERS IMMEDIATELY.
SPOTTER ACTIVATION MAY BE REQUIRED TONIGHT.

SCATTERED THUNDERSTORMS WILL OCCUR TONIGHT AND EARLY MONDAY MORNING
ACROSS SOUTHEAST LOWER MICHIGAN. SOME OF THESE THUNDERSTORMS MAY BE
SEVERE.

A LINE OF SHOWERS AND THUNDERSTORMS IS DEVELOPING ALONG AND AHEAD OF
A COLD FRONT STRETCHING FROM BAD AXE TO JACKSON. SOME OF THESE
STORMS MAY PRODUCE WINDS IN EXCESS OF 60 MPH.

THIS LINE IS MOVING EAST AT 40 MPH...AND WILL REACH FLINT BY 1045
PM...PONTIAC BY 11 PM...ANN ARBOR BY 11 PM...AND DETROIT BY 1115 PM.
THIS LINE IS NARROW AND THUNDERSTORM ACTIVITY SHOULD LAST FOR ONLY
ABOUT 30 MINUTES.

STAY TUNED TO THE NATIONAL WEATHER SERVICE FOR THE LATEST WEATHER
INFORMATION.

OKEEFE

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 6, 10:44 PM EST	Severe Thunderstorm Warning	DTX	Livingston	31 min
Dec 6, 10:55 PM EST	Severe Thunderstorm Warning	DTX	Lapeer	35 min
Dec 6, 10:59 PM EST	Severe Thunderstorm Warning	DTX	Lenawee	31 min
Dec 6, 11:05 PM EST	Severe Thunderstorm Warning	DTX	Oakland	40 min
Dec 6, 11:16 PM EST	Severe Thunderstorm Warning	DTX	Monroe	44 min
Dec 6, 11:19 PM EST	Severe Thunderstorm Warning	DTX	Wayne	41 min
Dec 6, 11:38 PM EST	Severe Thunderstorm Warning	DTX	Macomb	37 min
Dec 6, 11:42 PM EST	Severe Thunderstorm Warning	DTX	Saint Clair	33 min
Dec 6, 11:47 PM EST	Severe Thunderstorm Warning	DTX	Oakland	18 min
Dec 7, 12:11 AM EST	Severe Thunderstorm Warning	DTX	Saint Clair	19 min

Nearby

Severe Thunderstorm Warnings in Michigan, 1998 Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.