Alert archive / Michigan / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 39, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Sep 6, 1990, 6:45 PM EDT for Macomb County, Oakland County, Michigan. It was in force for 30 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
- Sep 6, 1990, 6:45 PM EDT (22:45 UTC)
- Expired
- Sep 6, 1990, 7:15 PM EDT
- In force
- 30 min
- Issued by
- NWS Detroit, MI
- Area
- Whole counties
Counties Macomb County, MI, Oakland County, MI
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 6, 7:00 PM EDT | Thunderstorm Wind 52 | Macomb, 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, 10.8 hours before the alert went out and 24 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
- 1594 J/kg
- Mixed-layer CIN
- -56 J/kg
- Mixed-layer LCL
- 630 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 185 m²/s²
- 0-3 km storm-relative helicity
- 178 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.9
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDTW 062245
SVRDTW
MIC125-099-147-062330-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE DETROIT MI
645 PM EDT THU SEP 6 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
AND SPECIAL MARINE WARNING EFFECTIVE UNTIL 730 PM EDT FOR
PEOPLE IN THE FOLLOWING COUNTIES
IN THE SOUTHEAST PART OF LOWER MICHIGAN
OAKLAND...MACOMB...EXTREME SOUTHERN ST. CLAIR
...THIS WARNING ALSO INCLUDES THE ADJACENT COASTAL WATERS FOR THE
COUNTIES JUST MENTIONED
AT 628 PM EDT...WEATHER RADAR INDICATED SEVERE THUNDERSTORMS OVER
SOUTHERN OAKLAND AND MACOMB COUNTIES. THE OAKLAND COUNTY DISASTER
PREPAREDNESS OFFICE REPORTED MINOR INJURIES AND PROPERTY DAMAGE DUE
TO WINDS IN EXCESS OF 60 MILES AN HOUR IN ROCHESTER...25 MILES
NORTH OF DOWNTOWN DETROIT. MOVEMENT WAS EAST SOUTHEAST AT 30 MILES
AN HOUR.
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER...
SEVE=RE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING. REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.
ZALESKI/THIESWhat 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, Sep 6, 3:37 PM EDT, 3 hours 8 minutes before
MIZ001>050-062100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ANN ARBOR MI 335 PM EDT THU SEP 6 1990 ...TORNADO WATCH NUMBER 724 HAS BEEN ISSUED FOR MUCH OF CENTRAL AND SOUTHERN LOWER MICHIGAN UNTIL 1100 PM EDT... A TORNADO WATCH HAS BEEN ISSUED FOR MUCH OF CENTRAL AND SOUTHERN LOWER MICHIGAN UNTIL 1100 PM EDT. THUNDERSTORMS HAVE BEEN REDEVELOPING IN LOWER MICHIGAN THIS AFTERNOON ALONG A WARM FRONT THAT EXTENDED FROM JUST NORTH OF MUSKEGON TO PORT HURON. CONDITIONS ARE SUCH THAT SOME OF THESE THUNDERSTORMS MAY PRODUCE LARGE HAIL... DAMAGING WINDS... AND POSSIBLE TORNADOES OVER THE REMAINDER OF THIS AFTERNOON AND TONIGHT. INCLUDED IN THE TORNADO WATCH AREA ARE ALL COUNTIES IN MICHIGAN SOUTH OF A LINE FROM MANISTEE TO NEAR OSCODA. > PERSONS IN THE WATCH AREA SHOULD STAY TUNED TO NATIONAL WEATHER SERVICE RADIO... OR YOUR LOCAL RADIO OR TELEVISION STATION FOR FURTHER UPDATES AND STATEMENTS ON THIS POTENTIALLY DANGEROUS W EATHER SITUATION. WAGENMAKER
Special weather statement, Sep 6, 3:49 PM EDT, 2 hours 56 minutes before
MIZ026-031>034-036>039-042-062100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE FLINT MI 349 PM EDT THU SEP 6 1990 ...A TORNADO WATCH IS IN EFFECT FOR EAST CENTRAL MICHIGAN TIL 11 PM... THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WATCH FOR THE EAST CENTRAL MICHIGAN COUNTIES OF GENESEE...LAPEER...SHIAWASSEE...SAGINAW... TUSCOLA...SANILAC...HURON...BAY...MIDLAND AND ARENAC UNTIL 11 PM EDT THIS THURSDAY AFTERNOON AND EVENING. THIS WATCH GENERALLY INCLUDES ALL COUNTIES IN SOUTHERN LOWER MICHIGAN. AT 345 PM RADAR SHOWED THUNDERSTORMS DEVELOPING JUST WEST OF SAGINAW COUNTY...ABOUT 45 MILES NORTHWEST OF FLINT. THESE THUNDERSTORMS WILL PRODUCE STRONG GUSTY WINDS...VERY HEAVY RAIN...AND FREQUENT DANGEROUS LIGHTNING AS THEY MOVE EAST ACROSS THE SAGINAW AREA DURING THE NEXT HOUR. SOME SMALL HAIL IS ALSO POSSIBLE IN NORTHERN SAGINAW COUNTY. PERSONS THROUGHOUT EAST CENTRAL MICHIGAN SHOULD REMAIN ALERT FOR THE APPROACH OF THREATE-NING WEATHER CONDITIONS. LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. YORK
Special weather statement, Sep 6, 6:12 PM EDT, 33 minutes before
MIZ001>050-070000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ANN ARBOR MI 610 PM EDT THU SEP 6 1990 ...TORNADO WATCH NUMBER 724 REMAINS IN EFFECT FOR MUCH OF CENTRAL AND SOUTHERN LOWER MICHIGAN UNTIL 1100 PM EDT... AT 600 PM... NUMEROUS STRONG THUNDERSTORMS CONTINUED ACROSS PARTS OF SOUTHEAST LOWER MICHIGAN. THESE STORMS WERE MOVING EAST SOUTHEAST AT 35 MILES AN HOUR. OTHER STRONG THUNDERSTORMS WERE DEVELOPING ACROSS PARTS OF CENTRAL LOWER MICHIGAN AND CENTRAL WISCONSIN THIS EVENING. THESE STORMS ARE EXPECTED TO INCREASE IN INTENSITY AS THE EVENING PROGRESSES. THUS... TORNADO WATCH NUMBER 724 REMAINS IN EFFECT UNTIL 1100 EDT FOR ALL OF LOWER MICHIGAN SOUTH OF A LINE FROM MANISTEE TO NEAR OSCODA. SOME THUNDERSTORMS IN THE WATCH AREA WILL BE CAPABLE OF PRODUCING LARGE HAIL... DAMAGING WINDS... AND POSSIBLE TORNADOES. PERSONS IN THE WATCH AREA SHOULD STAY TUNED TO NATIONAL WEATHER SERVICE RADIO... OR YOUR LOCAL RADIO OR TELEVISION STATION FOR FURTHER UPDATES AND STATEMENTS ON THIS POTENTIALLY DANGEROUS WEATHER SITUATION. WAGENMAKER
The office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 6, 5:00 AM EDT | Severe Thunderstorm Warning | DTX | Crawford | 60 min |
| Sep 6, 3:20 PM EDT | Severe Thunderstorm Warning | DTX | Washtenaw | 55 min |
| Sep 6, 4:02 PM EDT | Severe Thunderstorm Warning | DTX | Saginaw | 58 min |
| Sep 6, 4:21 PM EDT | Severe Thunderstorm Warning | DTX | Genesee, Tuscola | 54 min |
| Sep 6, 4:35 PM EDT | Severe Thunderstorm Warning | DTX | Genesee | 40 min |
| Sep 6, 4:53 PM EDT | Severe Thunderstorm Warning | DTX | Lapeer | 67 min |
| Sep 6, 5:28 PM EDT | Severe Thunderstorm Warning | DTX | Macomb, Oakland, Saint Clair | 62 min |
| Sep 6, 5:43 PM EDT | Severe Thunderstorm Warning | DTX | Genesee | 32 min |
| Sep 6, 5:55 PM EDT | Severe Thunderstorm Warning | DTX | Washtenaw, Wayne | 65 min |
| Sep 6, 6:45 PM EDT | Severe Thunderstorm Warning | DTX | Saint Clair | 30 min |
Nearby
Severe Thunderstorm Warnings in Michigan, 1990Every severe thunderstorm warning in 1990
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.