Alert archive / Michigan / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 39, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Jul 20, 1987, 7:45 PM EDT for Barry County, Ionia County, Michigan. It was in force for 30 min.
The area
The counties it named.
The facts
- Issued
- Jul 20, 1987, 7:45 PM EDT (23:45 UTC)
- Expired
- Jul 20, 1987, 8:15 PM EDT
- In force
- 30 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Whole counties
Counties Barry County, MI, Ionia 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
Detroit, MI (KFNT), launched 12:00Z, 11.8 hours before the alert went out and 144 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
- 3198 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 697 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 101 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 KGRR 202345 SVRGRR MIC067-005-015-210015- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING NATIONAL WEATHER SERVICE GRAND RAPIDS MI 745 PM EDT MON JUL 20 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING EFFECTIVE UNTIL 815 PM EDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF SOUTHWEST LOWER MICHIGAN...IONIA...ALLEGAN AND BARRY ...THIS WARNING ALSO INCLUDES THE ADJACENT COASTAL WATERS FOR THE COUNTIES JUST MENTIONED AT 740 PM EDT...A REPORT WAS RECEIVED OF TREES AND POWER LINES DOWN AND ALSO A REPORT OF A POSSIBLE FUNNEL CLOUD 6 MILES SOUTHWEST OF THE CITY OF ALLEGAN...30 MILES SOUTHWEST OF GRAND RAPIDS. THE LINE THUNDERSTORMS AND ASSOCIATED GUST FRONT WILL BE MOVING INTO NORTHERN BARRY AND SOUTHERN IONIA COUNTIES BY 855 PM EDT. THE THUNDERSTORMS ARE MOVING SOUTHEAST AT 40 MPH. SEVERE THUNDERSTORMS ARE EXTREMELY DANGEROUS. THEY HAVE BEEN KNOWN TO PRODUCE WIIND GUSTS OVER 175 MPH AND HAILSTONES UP TO 6 INCHES IN DIAMETER. TAKE COVER IMMEDIATELY WHEN A SEVERE THUNDERSTORM IS NEAR. CARLE
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 20, 4:33 PM EDT, 3 hours 12 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MUSKEGON MI 435 PM EDT MON JUL 20 1987 ...LINE OF STRONG THUNDERSTORMS MOVING INTO NORTHWEST LOWER MICHIGAN AND THE ADJOINING LAKE MICHIGAN WATERS... AT 430 PM EDT A LINE OF STRONG THUNDERSTORMS...A FEW CAPABLE OF PRODUCING SEVERE WEATHER...WAS MOVING ONSHORE OVER NORTHWEST LOWER MICHIGAN. THE STRONG STORMS WERE LOCATED ONSHORE OVER LEELANAU AND BENZIE COUNTIES AND MOVING ONSHORE OVER MANISTEE COUNTY IN NORTHWEST LOWER MICHIGAN. THE STORMS WERE MOVING FAIRLY FAST SOUTHEAST AT 40 MILES AN HOUR. BOATER/S IN THE VICINITY OF THESE STORMS SHOULD TAKE SAFE HARBOR IMMEDIATELY AS THE STORMS MOVE ONSHORE. SEVERE THUNDERSTORM WATCH NUMBER} 405 REMAINS IN EFFECT UNTIL 1000 PM EDT THIS EVENING FOR PERSON/S IN NORTHWEST LOWER MICHIGAN. }BOLEN
Special weather statement, Jul 20, 5:22 PM EDT, 2 hours 23 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LANSING, MI 521 PM EDT MON JUL 20 1987 ...SEVERE THUNDERSTORM WATCH UNTIL 1000 PM EDT FOR NORTHERN TWO THIRDS OF LOWER MICHIGAN...INCLUDING ISABELLA...GRATIOT...CLINTON COUNTIES... ...VERY STRONG THUNDERSTORMS MOVING TOWARD ISABELLA COUNTY... AT 520 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED A LINE OF VERY STRONG THUNDERSTORMS MOVING ACROSS NORTHERN LOWER MICHIGAN. THE LINE EXTENDED FROM 40 MILES NORTH OF HOUGHTON LAKE SOUTHWEST ACROSS LAKE MICHIGAN NORTH OF MILWAUKEE. AT THEIR PRESENT MOVEMENT...THESE STORMS WILL REACH ISABELLA COUNTY BETWEEN 600 AND 630 PM EDT. SOME OF THE THUNDERSTORMS IN THIS LINE HAVE BECOME SEVERE. TRAVERSE CITY RECORDED A WIND GUST TO 81 MPH WHEN THESE STORMS PASSED THROUGH. DAMAGING WINDS...LARGE HAIL...VERY HEAVY RAIN...FREQUENT AND DEADLY LIGHTNING ARE POSSIBLE WITH THESE STORMS. COKELY
Special weather statement, Jul 20, 5:56 PM EDT, 1 hour 49 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LANSING, MI 551 PM EDT MON JUL 20 1987 ...SEVERE THUNDERSTORM WATCH UNTIL 1000 PM EDT FOR NORTHERN TWO THIRDS OF LOWER MICHIGAN...INCLUDING ISABELLA...GRATIOT...CLINTON COUNTIES... ...VERY STRONG THUNDERSTORMS MOVING TOWARD ISABELLA COUNTY... AT 555 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED A LINE OF VERY STRONG THUNDERSTORMS MOVING ACROSS CENTRAL LOWER MICHIGAN. THE LINE EXTENDED FROM HOUGHTON LAKE TO 30 MILES NORTHWEST OF MT. PLEASANT TO MILWAUKEE...MOVING SOUTHEAST AT 40 MPH. WIND GUSTS TO 50 MPH WERE REPORTED JUST AHEAD OF THIS LINE. PERSONS IN NORTHWEST ISABELLA COUNTY CAN EXPECT THIS LINE OF STORMS BETWEEN 600 AND 615 PM. STRONG WINDS WILL APPRAOCH MT PLEASANT BETWEEN 615 AND 630 PM EDT. DAMAGING WINDS...LARGE HAIL...VERY HEAVY RAIN...FREQUENT AND DEADLY LIGHTNING ARE POSSIBLE WITH THESE STORMS. BE PREPARED TO SEEK SHELTER. COKELY
Special weather statement, Jul 20, 6:36 PM EDT, 1 hour 9 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAND RAPIDS MI 535 PM EDT MON JUL 20 1987 ...LINE OF SHOWERS AND THUNDERSTORMS MOVING TOWARD SOUTHWEST LOWER MICHIGAN... AT 525 PM EDT THE MONTCALM COUNTY SHERIFF WIND GUST OVER 40 MPH NEAR THE SIX LAKES AREA IN NORTHERN MONTCALM COUNTY AND SOUTHWEST OF HOWARD CITY IN WESTERN MONTCALM COUNTY. AT 530 PM EDT TREES AND POWER LINES WERE REPORTED DOWN IN AREAS OF KENT COUNTY. THE STRONG WINDS ARE BE2ING CAUSED BY A GUST FRONT MOVING AHEAD OF THE LINE OF SHOWERS AND THUNDERSTORMS. THE SHOWERS AND THUNDERSTORMS ARE MOVING SOUTHEAST AT 40 MPH. CARLE
Special weather statement, Jul 20, 6:49 PM EDT, 56 minutes before
SPECIAL WEATHER STATEMENTCORRECTED FOR TIME... NATIONAL WEATHER SERVICE GRAND RAPIDS MI 635 PM EDT MON JUL 20 1987 ...LINE OF SHOWERS AND THUNDERSTORMS MOVING TOWARD SOUTHWEST LOWER MICHIGAN... AT 625 PM EDT THE MONTCALM COUNTY SHERIFF REPORTED WIND GUSTS OVER 40 MPH NEAR THE SIX LAKES AREA IN NORTHERN MONTCALM COUNTY AND SOUTHWEST OF HOWARD CITY IN WESTERN MONTCALM COUNTY. AT 630 PM EDT TREES AND POWER LINES WERE REPORTED DOWN IN AREAS OF K@ENT COUNTY. THE STRONG WINDS ARE BEING CAUSED BY A GUST FRONT MOVING AHEAD OF THE LINE OF SHOWERS AND THUNDERSTORMS. THE SHOWERS AND THUNDERSTORMS ARE MOVING SOUTHEAST AT 40 MPH. CARLE
Special weather statement, Jul 20, 6:54 PM EDT, 51 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAND RAPIDS MI 655 PM EDT MON JUL 20 1987 ...LINE OF SHOWERS AND THUNDERSTORMS MOVING TOWARD SOUTHWEST LOWER MICHIGAN... AT 650 PM EDT NUMEROUS REPORTS OF TREES AND POWER LINES DOWN HAVE BEEN RECEIVED AT THE NATIONAL WEATHER SERVICE OFFICE. WIND GUSTS OF 45 TO 55 MPH HAVE ALSO BEEN REPORTED. THE STRONG WINDS ARE BEING CAUSED BY A GUST FRONT MOVING AHEAD OF THE LINE OF SHOWERS AND THUNDERSTORMS.I THE SHOWERS AND THUNDERSTORMS ARE MOVING SOUTHEAST AT 40 MPH. CARLE
The office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 6:40 PM EDT | Severe Thunderstorm Warning | GRR | Isabella | 50 min |
| Jul 20, 6:53 PM EDT | Severe Thunderstorm Warning | GRR | Clinton, Gratiot | 37 min |
| Jul 20, 7:23 PM EDT | Severe Thunderstorm Warning | GRR | Kent | 37 min |
| Jul 20, 7:33 PM EDT | Severe Thunderstorm Warning | GRR | Clinton | 27 min |
| Jul 20, 7:37 PM EDT | Severe Thunderstorm Warning | GRR | Eaton, Ingham | 68 min |
| Jul 20, 7:45 PM EDT | Severe Thunderstorm Warning | GRR | Allegan | 30 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.