Alert archive / Michigan / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 3, NWS Detroit, MI

April 9, 2001Lenawee County, Washtenaw County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Apr 9, 2001, 9:54 AM EDT for Lenawee County, Washtenaw County, Michigan. It was in force for 51 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 9, 2001, 9:54 AM EDT (13:54 UTC)
Expired: Apr 9, 2001, 10:45 AM EDT
In force: 51 min
Issued by: NWS Detroit, MI
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Lenawee County, MI, Washtenaw County, MI

What was reported inside it

Time	Report	Where	Remark
Apr 9, 10:05 AM EDT	Hail 1.25	Adrian, MI
Apr 9, 10:11 AM EDT	Hail 1.75	Manchester, 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 nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 1.9 hours before the alert went out and 98 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: 793 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 353 m²/s²
0-3 km storm-relative helicity: 455 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KDTX 091355
SVRDTX
MIC091-161-091445-

BULLETIN - EAS ACTIVATION/IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
954 AM EDT MON APR 9 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WASHTENAW COUNTY IN SOUTHEAST MICHIGAN
  LENAWEE COUNTY IN SOUTHEAST MICHIGAN

* UNTIL 1045 AM EDT

* AT 954 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER ROME CENTER...OR 7 MILES NORTHWEST OF     
  ADRIAN...MOVING EAST AT 50 MPH.  ANOTHER SEVERE THUNDERSTORM WAS 
  LOCATED JUST SOUTH OF BROOKLYN.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  TECUMSEH...HOLLOWAY...CLINTON AT 1005 AM EDT
  BRITTON AT 1010 AM EDT

THESE STORMS ARE CAPABLE OF PRODUCING HAIL UP TO ONE INCH IN 
DIAMETER. HAIL OF THIS SIZE MAY DAMAGE WINDOWS...ALUMINUM SIDING...OR
VEHICLES...IF ACCOMPANIED BY STRONG WIND GUSTS. STAY INSIDE AWAY FROM
WINDOWS UNTIL THE STORMS HAVE PASSED.

LAT...LON 4201 8430 4184 8424 4195 8379 4224 8410

BT DJF

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 Apr 9, 4:25 AM EDT, 5 hours 29 minutes earlier.

Area forecast discussion, Apr 9, 4:25 AM EDT, 5 hours 29 minutes before

SOUTHEAST MICHIGAN AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
425 AM EDT MON APR 9 2001

DUE TO SEVERE WEATHER IN THE CWA...THIS AFD WILL BE BRIEF...SORRY

INITIAL BAROCLINIC BOUNDARY IS MOVING SLOWLY NORTHEAST ACROSS THE
CWA.  MODELS TAKE MCS ACROSS THE CWA THIS MORNING.  FLASH FLOOD
GUIDANCE VALUES COMPARED TO QPF SHOULD KEEP THINGS IN LINE.
ALTHOUGH...STILL MENTIONED HEAVY RAINFALL IN ZONES.  WILL HAVE TO BE
WATCHED.

SHOULD GET A DECENT SUBSTANCE BEHIND DEPARTING MCS THIS AFTERNOON.
WITH NORTHEAST FLOW OFF LAKE HURON...EXPECT COOLER TEMPS COUNTIES
THERE.

THEN WAVE OVER THE PLAINS BEGINS TO PUSH EAST.  STILL NOT CERTAIN
ABOUT POPS TONIGHT BUT WHERE BETTER CONVERGENCE IS WILL BE NEAR THE
BORDER.  WITH TT/S ABOVE 50 AND THE POTENTIAL OF MORE ELEVATED
CONVECTION...STILL WILL LEAVE THE MENTION OF STORMS SOUTH AND NORTH
1/3 AND NEAR LAKE HURON JUST SHOWERS.

DRYING TAKES PLACE TUESDAY BEFORE WE MAY BE DOING THIS ALL OVER
AGAIN TUESDAY NIGHT AND WEDNESDAY AS NEXT SYSTEM IN THE PLAINS
DEVELOPS.

ZONES BY 445 AM (HOPEFULLY).

THANKS FOR THE COORD GRR AND APX

.DTX...NONE.

BGM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 3:17 AM EDT	Severe Thunderstorm Warning	DTX	Lenawee, Monroe	43 min
Apr 9, 8:41 AM EDT	Severe Thunderstorm Warning	DTX	Genesee	34 min
Apr 9, 10:17 AM EDT	Severe Thunderstorm Warning	DTX	Monroe	43 min
Apr 9, 10:34 AM EDT	Severe Thunderstorm Warning	DTX	Wayne	56 min
Apr 9, 10:42 AM EDT	Severe Thunderstorm Warning	DTX	Washtenaw	48 min
Apr 9, 11:03 AM EDT	Severe Thunderstorm Warning	DTX	Oakland	57 min
Apr 9, 11:19 AM EDT	Severe Thunderstorm Warning	DTX	Macomb	41 min

Nearby

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.