Alert archive / Michigan / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 21, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at May 13, 1991, 4:20 PM EDT for Lenawee County, Monroe County, Washtenaw County, Michigan. It was in force for 55 min. 1 report 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
- May 13, 1991, 4:20 PM EDT (20:20 UTC)
- Expired
- May 13, 1991, 5:15 PM EDT
- In force
- 55 min
- Issued by
- NWS Detroit, MI
- Area
- Whole counties
Counties Lenawee County, MI, Monroe County, MI, Washtenaw County, MI
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 13, 4:30 PM EDT | Thunderstorm Wind 52 | Washtenaw, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Detroit, MI (KFNT), launched 12:00Z, 8.3 hours before the alert went out and 83 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.
- Mixed-layer CAPE
- 282 J/kg
- Mixed-layer CIN
- -126 J/kg
- Mixed-layer LCL
- 1230 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDTW 132020
SVRDTW
MIC161-091-115-132115-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DETROIT MI
420 PM EDT MON MAY 13 1991
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 515 PM EDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN THE SOUTHEAST PART OF LOWER MICHIGAN
WASHTENAW...LENAWEE...MONROE
AT 415 PM EST...RADAR INDICATED SEVERE THUNDERSTORMS...55 MILES
WEST TO 40 MILES SOUTHWEST OF DOWNTOWN DETROIT. LENAWEE COUNTY
SHERIFFS DEPARTMENT REPORTED WINDS IN EXCESS OF 60 MILES AN HOUR
NEAR ADRIAN. MOVEMENT WAS EAST AT 25 MILES AN HOUR.
PERSONS IN THE CITIES OF MANCHESTER...ADRIAN AND DUNDEE SHOULD
TAKE COVER NOW.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS. HEAVY RAINS FLO"OD ROADWAYS QUICKLY...
AVOID DRIVING INTO AREAS WHERE WATER COVERS THE ROAD.
ZALESKIWhat 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.
In the hours before
Special weather statement, May 13, 11:28 AM EDT, 4 hours 52 minutes before
MIZALL-132200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ANN ARBOR MI 1130 AM EDT MON MAY 13 1991 ...SEVERE WEATHER POTENTIAL STATEMENT FOR MICHIGAN... AT 1100 AM...SCATTERED THUNDERSTORMS WERE NEAR ALPENA AND OVER NORTHERN LAKES MICHIGAN AND HURON THROUGH THE STRAITS AREA. THESE STORMS WERE MOVING SOUTHEAST. SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON OVER UPPER MICHIGAN. THERE IS A CHANCE THAT SOME OF THESE STORMS COULD PRODUCE SEVERE WEATHER THIS AFTERNOON AND EVENING. WIND GUSTS OVER 50 MPH ARE POSSIBLE AS WELL AS HAIL TO ONE INCH IN DIAMETER. SCATTERED THUNDERSTORMS ARE ALSO EXPECTED IN LOWER MICHIGAN LATE THIS AFTERNOON...BUT THEY ARE NOT EXPECTED TO BE SEVERE. THERE IS A CHANCE THAT SOME STORMS IN NORTH LOWER MICHIGAN COULD APPROACH SEVERE LEVELS TONIGHT. IN ADDITION...THUNDERSTORMS THAT OCCUR IN THE MOIST AIR OVER MICHIGAN THIS AFTERNOON AND TONIGHT MAY PRODUCE SOME LOCALLY HEAVY DOWNPOURS. IF FURTHER DEVELOPMENTS CONFIRM THIS SEVERE WEATHER OUTLOOK... WATCHES...WARNINGS...AND STATEMENTS WILL BE ISSUED AS NECESSARY. WH
Special weather statement, May 13, 3:49 PM EDT, 31 minutes before
MIZ019>035-131945- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DETROIT MI 345 PM EDT WED MAY 13 1991 ...INTENSE THUNDERSTORMS HAVE RAPIDLY DEVELOPED OVER SOUTHEAST LOWER MICHIGAN... AT 330 PM...AN AREA OF SCATTERED SHOWERS AND THUNDERSTORMS...120 MILES WIDE...PRODUCING VERY HEAVY RAIN...WAS OVER SOUTHWEST SOUTH CENTRAL AND SOUTHEAST LOWER MICHIGAN...AND PARTS OF EXTREME NORTHWEST OHIO. THE HEAVIEST SHOWERS AND THUNDERSTORMS EXTENDED FROM 20 MILES NORTHEAST OF JACKSON MICHIGAN SOUTHEAST TO TOLEDO OHIO. MOVEMET WAS TO THE EAST NORTHEAST AT 25 MILES AN HOUR. RPN
The office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 13, 5:08 PM EDT | Severe Thunderstorm Warning | DTX | Monroe, Wayne | 67 min |
Nearby
Severe Thunderstorm Warnings in Michigan, 1991Every severe thunderstorm warning in 1991
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.