Alert archive / Michigan / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 27, NWS Gaylord, MI
NWS Gaylord, MI issued this severe thunderstorm warning at Jul 12, 1987, 4:15 PM EDT for Chippewa County, Michigan. It was in force for 45 min.
The area
The counties it named.
The facts
- Issued
- Jul 12, 1987, 4:15 PM EDT (20:15 UTC)
- Expired
- Jul 12, 1987, 5:00 PM EDT
- In force
- 45 min
- Issued by
- NWS Gaylord, MI
- Area
- Whole counties
County Chippewa County, MI
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Sault Ste Marie, MI (KSSM), launched 12:00Z, 8.3 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
- 44 J/kg
- Mixed-layer CIN
- -493 J/kg
- Mixed-layer LCL
- 1000 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 65 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 KSSM 122011 SVRSSM MIC033-122015- BULLETIN...IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING NATIONAL WEATHER SERVICE SAULT STE MARIE MI 415 PM EDT SUN JUL 12 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING EFFECTIVE UNTIL 500 PM EDT FOR PERSONS IN THE FOLLOWING COUNTIES OF NORTHERN MICHIGAN...EASTERN CHIPPEWA AND ADJACENT COASTAL WATERS OF NORTHERN LAKE MICHIGAN AND NORTHERN LAKE HURON INCLUDING THE STRAITS AREA AND THE ST MARY'S RIVER SYSTEM... AT 405 PM EDT WEATHER RADAR INDICATED SEVERAL HEAVY THUNDERSTORM CELLS ...ONE 25 MILES EAST NORTHEAST OF MACKINAW CITY OR 10 MILES SOUTHWEST OF DETOUR AND ANOTHER CELL JUST OVER BOIS BLANC ISLAND.. WHICH IS ABOUT 5 MILES SOUTHWEST OF MACKINAW ISLAND. ALL THESE CELLS ARE MOVING TO THE NORTHEAST AT 25 MPH. REMEMBER A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH...LARGE HAIL...DEADLY LIGHTNING...AND HEAVY RAINS THAT CAN QUICKLY FLOOD A LOW LYING AREA. IF THREATENING WEATHER APPROACHES...YOU SHOULD GO TO A SAFE PLACE IMMEDIATELY...AND YOU SHOULD ASK YOUR NEAREST LAW ENORCEMENT AGENCY TO RELAY YOUR SEVERE WEATHER REORTS TO THFE NATIONAL WEATHER SERVICE. BOATERS SHOULD GO TO A SAFE HARBOR IMMEDIATELY. MAS
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.
In the hours before
Special weather statement, Jul 12, 1:21 PM EDT, 2 hours 54 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ALPENA MI 115 PM EDT SUN JUL 12 1987 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT... A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MOST OF EASTERN UPPER MICHIGAN...PORTIONS OF NORTHERN AND WESTERN LOWER MICHIGAN...LAKE MICHIGAN AND A SMALL PART OF NORTHWEST LAKE HURON. THIS INCLUDES THE FOLLLOWING COUNTIES OF NORTHEAST LOWER MICHIGAN... PRESQUE-ISLE AND MONTMORENCY...AND THE ADJOINING COASTAL WATERS FROM MIDDLE ISLAND TO 20 MILES NORTHWEST OF HAMMOND BAY. ALTHOUGH NO SEVERE WEATHER HAS BEEN OBSERVED OR REPORTED...CONDITIONS ARE SUCH THAT SEVERE WEATHER COULD OCCUR. STAY TUNED TO YOUR LOCAL RADIO OR TV STATION...OR TO THE NOAA WEATHER RkADIO FOR THE LATEST DEVELOPMENTS OF THIS WATCH AREA. DS
Special weather statement, Jul 12, 2:43 PM EDT, 1 hour 32 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ALPENA MI 237 PM EDT SUN JUL 12 1987 ...TORNADO WATCH NUMBER 374 IS IN EFFECT UNTIL 1100 EDT TONIGHT... A TORNADO WATCH IS IN EFFECT FOR THE EAST END OF UPPER MICHIGAN AND ALL OF LOWER MICHIGAN INCLUDING THE COASTAL WATERS OF LAKE HURON AND LAKE MICHIGAN. SEVERE THUNDERSTORM WATCH NUMBER 372 IS NO LONGER IN EFFECT. ALTHOUGH NO SEVERE WEATHER HAS BEEN OBSERVED OR REPORTED OVER NORTHEAST LOWER MICHIGAN...CONDITIONS EXIST IN WHICH SEVERE WEATHER COULD OCCUR. STAY TUNED TO THE NOAA WEATHER RAIDO OR TO YOUR LOCAL COMMERCIAL TV OR RADIO STATION FOR THE LATEST DEVELOPMENTS CONCERNING THIS WATCH AREA.
Special weather statement, Jul 12, 3:03 PM EDT, 1 hour 12 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAULT STE MARIE MI 300 PM EDT SUN JUL 12 1987 ...TORNADO WATCH IN EFFECT UNTIL 1100 PM EDT... ...SEVERE THUNDERSTORM WARNING AND SPECIAL MARINE WARNING FOR MACKINAW COUNTY CANCELLED... THE SEVERE THUNDERSTORM WARNING IN EFFECT FOR EASTERN CHIPPEWA COUNTY HAS BEEN CANCELLED. HOWEVER A TORNADO WATCH IS IN EFFECT UNTIL 1100 PM EDT FOR MACKINAW..CHIPPEWA AND LUCE COUNTIES AS WELL OF ALL OF LOWER MICHIGAN. ONE HALF INCH HAIL AND WINDS GUSTING TO AROUND 40 MPH WAS REPORTED AT 215 PM EDT IN THE DAFTER AREA ...APPROXIMATELY 10 MILES SOUTH OF SAULT STE MARIE MICHIGAN. THE AREA OF THUNDERSTORMS HAS MOVED NORTHEAST INTO CANADA. RADAR DOES SHOW ANOTHER LINE OF THUNDERSTORMS JUST EAST OF MARQUETTE EXTENDING SOUTH. THESE STORMS ARE MOVING NORTHEAST AND SHOWING SIGNS OF INTENSIFING. MAS
Special weather statement, Jul 12, 3:11 PM EDT, 1 hour 4 minutes before
SPECIAL WEATHER STATEMENT...CORRECTION... NATIONAL WEATHER SERVICE SAULT STE MARIE MI 300 PM EDT SUN JUL 12 1987 ...TORNADO WATCH IN EFFECT UNTIL 1100 PM EDT... ...SEVERE THUNDERSTORM WARNING AND SPECIAL MARINE WARNING FOR CHIPPEWA COUNTY CANCELLED... THE SEVERE THUNDERSTORM WARNING IN EFFECT FOR EASTERN CHIPPEWA COUNTY HAS BEEN CANCELLED. HOWEVER A TORNADO WATCH IS IN EFFECT UNTIL 1100 PM EDT FOR MACKINAW..CHIPPEWA AND LUCE COUNTIES AS WELL OF ALL OF LOWER MICHIGAN. ONE HALF INCH HAIL AND WINDS GUSTING TO AROUND 40 MPH WAS REPORTED AT 215 PM EDT IN THE DAFTER AREA ...APPROXIMATELY 10 MILES SOUTH OF SAULT STE MARIE MICHIGAN. THE AREA OF THUNDERSTORMS HAS MOVED NORTHEAST INTO CANADA. RADAR DOES SHOW ANOTHER LINE OF THUNDERSTORMS JUST EAST OF MARQUETTE EXTENDING SOUTH. THESE STORMS ARE MOVING NORTHEAST AND SHOWING SIGNS OF INTENSIFING. MAS
The office that day
Everything else NWS Gaylord, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 2:15 PM EDT | Severe Thunderstorm Warning | APX | Chippewa | 45 min |
| Jul 12, 4:50 PM EDT | Tornado Warning | APX | Chippewa | 25 min |
| Jul 12, 5:12 PM EDT | Severe Thunderstorm Warning | APX | Alpena, Presque Isle | 63 min |
| Jul 12, 5:12 PM EDT | Severe Thunderstorm Warning | APX | Montmorency | 38 min |
| Jul 12, 5:15 PM EDT | Severe Thunderstorm Warning | APX | Chippewa | 45 min |
| Jul 12, 5:41 PM EDT | Severe Thunderstorm Warning | APX | Alpena, Presque Isle | 49 min |
Nearby
Severe Thunderstorm Warnings in Michigan, 1987Every severe thunderstorm warning in 1987
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.