Alert archive / Michigan / Tornado Warnings in 1991
Tornado Warning 4, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this tornado warning at Jul 7, 1991, 8:13 PM EDT for Calhoun County, Michigan. It was in force for 17 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
- Jul 7, 1991, 8:13 PM EDT (00:13 UTC)
- Expired
- Jul 7, 1991, 8:30 PM EDT
- In force
- 17 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Whole counties
County Calhoun County, MI
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 7, 8:15 PM EDT | Thunderstorm Wind 0 | Calhoun, 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 00:00Z, 0.2 hours before the alert went out and 140 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
- 1102 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 1632 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 4.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KLAN 080015 TORLAN MIC025-080030- BULLETIN - EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE LANSING MI 813 PM EDT SUN JUL 7 1991 THE NATIONAL WEATHER SERVICE IN LANSING HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 830 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTH CENTRAL MICHIGAN ...EASTERN CALHOUN COUNTY AT 750 PM EDT A POSSIBLE TORNADO WAS SIGHTED OVER THE CITY OF MARSHALL IN CALHOUN COUNTY. THE STORM WAS MOVING TO THE EAST AT 45 MPH AND WILL BE OUT OF CALHOUN COUNTY BY 830 PM EDT. IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A BASEMENT. GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE. IF NO BASEMENT IS AVAILABLE...SEEK SHELTER /IN AN INTERIOR ROOM SUCH AS A CLOSET ON THE LOWEST FLOOR. USE BLANKETS...PILLOWS... OR CUSHIONS TO COVER YOUR BODY. AVOID WINDOWS.
What forecasters said that day
The local office's own words before this tornado 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 7, 5:49 PM EDT, 2 hours 24 minutes before
MIZ013-004-016-015-003-010-009-002-072245- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAND RAPIDS MI 548 PM EDT THU JUL 4 1991 ...TORNADO WATCH IN EFFECT UNTIL 1100 PM EDT... ...STRONG THUNDERSTORMS APPROACHING THE EAST SHORE OF LAKE MICHIGAN... AT 543 PM EDT...WEATHER RADAR SHOWED A LINE OF STRONG THUNDERSTORMS APPROACHING THE EAST SHORE OF LAKE MICHIGAN. THE LINE WAS JUST OFFSHORE GRAND HAVEN...TO 15 MILES WEST OF ST. JOSEPH. THE LINE WAS MOVING TO THE EAST AT 50 MPH AND WILL REACH THE CITIES OF COOPERSVILLE AND PAW PAW BY 615 PM EDT. THESE STORMS HAVE A HISTORY OF PRODUCING VERY STRONG WINDS...HAIL...AND TORNADOES. PERSONS IN SOUTHWEST LOWER MICHIGAN SHOULD BE ON THE LOOKOUT FOR POSSIBLE SEVERE WEATHER. IF SEVERE WEATHER IS SIGHTED IN YOUR AREA... TAKE COVER IMMEDIATELY. AFTER THE WEATHER HAS PASSED...NOTIFY YOUR NEAREST LAW ENFORCEMENT AGENCY. MJK
Special weather statement, Jul 7, 6:26 PM EDT, 1 hour 47 minutes before
MIZ011-012-018-020-022-023-025-040-041-080100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LANSING MI 625 PM EDT SUN JUL 7 1991 ...TORNADO WATCH IN EFFECT FOR SOUTH CENTRAL LOWER MICHIGAN UNTIL 1100 PM EDT... AT 600 PM EDT...WEATHER RADAR SHOWED STRONG THUNDERSTORMS EXTENDING ACROSS MUCH OF CENTRAL AND SOUTHERN LAKE MICHIGAN...JUST REACHING THE SHORE NEAR MUSKEGON. THE LINE OF STORMS WAS MOVING TO THE EAST AT 45 TO 50 MPH. AROUND SOUTH CENTRAL LOWER MICHIGAN...SKIES WERE MOSTLY SUNNY WITH TEMPERATURES IN THE UPPER 80S TO NEAR 90. THE WIND WAS FROM THE SOUTH- WEST AT 5 TO 15 MPH. SKIES WILL BECOME MOSTLY CLOUDY EARLY THIS EVENING ACROSS SOUTH CENTRAL LOWER MICHIGAN. THE FAST MOVING THUNDERSTORMS ALONG THE LAKESHORE WILL MOVE THROUGH THE AREA BETWEEN 730 AND 830 PM. TEMPERATURES WILL REMAIN IN THE UPPER 80S EARLY...AND THEN FALL INTO THE MID 70S AFTER THE STORMS MOVE THROUGH. WINDS WILL BE VARIABLE AT 5 TO 15 MPH AND THEN BECOME WEST. SOME OF THESE THUNDERSTORMS MAY BE SEVERE WITH STRONG WINDS... LARGE HAIL... AND HEAVY RAIN. TORNADOES ARE ALSO POSSIBLE WITH THESE STORMS IN SOUTH CENTRAL LOWER MICHIGAN. STAY TUNED TO NATIONAL WEATHER SERVICE WEATHER RADIO FOR TH]E LATEST STATEMENTS AND UPDATES ON THIS DANGEROUS WEATHER SITUATION. SHEETS
Special weather statement, Jul 7, 7:01 PM EDT, 1 hour 12 minutes before
MIZ011-012-018-020-022-023-025-040-041-080100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LANSING MI 800 PM EDT SUN JUL 7 1991 ...TORNADO WATCH IN EFFECT FOR SOUTH CENTRAL LOWER MICHIGAN UNTIL 1100 PM EDT... ...STRONG THUNDERSTORMS APPROACHING SOUTH CENTRAL LOWER MICHIGAN... AT 700 PM EDT WEATHER RADAR INDICATED STRONG THUNDERSTORMS WERE BEGINNING TO APPROACH SOUTH CENTRAL LOWER MICHIGAN. A LINE OF STORMS EXTENDED FROM NEAR GRAND RAPIDS SOUTHWEST TO GRAND HAVEN...WITH ANOTHER AREA IN BERRY COUNTY. THESE STORMS ARE MOVING TO THE EAST BETWEEN 45 AND 50 MPH WITH THE LEADING STORM ENTERING EATON COUNTY BY 720 PM EDT. PERSONS IN THE PATH OF THESE STORMS SHOULD BE ON THE LOOKOUT FOR STRONG GUSTY WINDS...POSSIBLE TORNADOES...FREQUENT DEADLY LIGHTNING AND HEAVY RAINS. . STAY TUNED TO NATIONAL WEATHER SERVICE RADIO FOR THE LATEST STATEMENTS AND UPDATES ON THE POTENTIALLY DANGEROUS WEATHER SITUATION. P.LEWIS
Special weather statement, Jul 7, 7:05 PM EDT, 1 hour 8 minutes before
MIZ011-012-018-020-022-023-025-040-041-080100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LANSING MI 700 PM EDT SUN JUL 7 1991 ...TORNADO WATCH IN EFFECT FOR SOUTH CENTRAL LOWER MICHIGAN UNTIL 1100 PM EDT... ...STRONG THUNDERSTORMS APPROACHING SOUTH CENTRAL LOWER MICHIGAN... AT 700 PM EDT WEATHER RADAR INDICATED STRONG THUNDERSTORMS WERE BEGINNING TO APPROACH SOUTH CENTRAL LOWER MICHIGAN. A LINE OF STORMS EXTENDED FROM NEAR GRAND RAPIDS SOUTHWEST TO GRAND HAVEN...WITH ANOTHER AREA IN BERRY COUNTY. THESE STORMS ARE MOVING TO THE EAST BETWEEN 45 AND 50 MPH WITH THE LEADING STORM ENTERING EATON COUNTY BY 720 PM EDT. PERSONS IN THE PATH OF THESE STORMS SHOULD BE ON THE LOOKOUT FOR STRONG GUSTY WINDS...POSSIBLE TORNADOES...FREQUENT DEADLY LIGHTNING AND HEAVY RAINS. . STAY TUNED TO NATIONAL WEATHER SERVICE RADIO FOR THE LATEST STATEMENTS AND UPDATES ON THE POTENTIALLY DANGEROUS WEATHER SITUATION. P.LEWIS ...CORRECTION TO TIME IN HEADER...
The office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 8:15 PM EDT | Severe Thunderstorm Warning | GRR | Jackson | 60 min |
| Jul 7, 8:21 PM EDT | Severe Thunderstorm Warning | GRR | Hillsdale | 69 min |
Nearby
Tornado Warnings in Michigan, 1991Every tornado warning in 1991Tornadoes 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.