Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 63, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 20, 1987, 8:09 PM CDT for Ramsey County, Washington County, Minnesota. It was in force for 51 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 20, 1987, 8:09 PM CDT (01:09 UTC)
- Expired
- Jul 20, 1987, 9:00 PM CDT
- In force
- 51 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
Counties Ramsey County, MN, Washington County, MN
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 |
|---|---|---|---|
| Jul 20, 8:22 PM CDT | Hail 1.75 | Ramsey, MN |
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
Minneapolis, MN (KSTC), launched 00:00Z, 1.2 hours before the alert went out and 52 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
- 3871 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 860 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 4.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMSP 210109 SVRMSP MNC123-163-210200- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MINNEAPOLIS MN 809 PM CDT MON JUL 20 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 900 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF EAST CENTRAL MINNESOTA... NORTHEAST RAMSEY AND CENTRAL WASHINGTON AT..A SEVERE THUNDERSTORM PRODUCED 60 TO 70 MPH WINDS IN THE NEW BRIGHTON AREA OF NORTHERN RAMSEY COUNTY WHICH IS ABOUT 10 MILES NORTH OF ST PAUL. THIS SEVERE THUNDERSTORM WAS MOVING EAST 20 MILES AN HOUR AND WILL BE AFFECTING THE TOWNS OF WHITE BEAR LAKE AND STILLWATER. REMEMBER SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH..DESTRUCTIVE HAIL..DEADLY LIGHTNING AND VERY HEAVY RAIN. ALSO SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE WARNING..SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE TO A PLACE OF S|AFETY IF ONE IS SPOTTED. BRANCH
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, 2:16 PM CDT, 5 hours 53 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 215 PM CDT MON JUL 20 1987 ...SEVERE THUNDERSTORM WATCH NUMBER 404 CANCELED FOR EAST CENTRAL MINNESOTA... THE NATIONAL WEATHER SERVICE HAS CANCELED THE SEVERE THUNDERSTORM WATCH ISSUED EARLIER FOR EAST CENTRAL MINNESOTA WHICH INCLUDED THE TWIN CITIES METRO AREA. THE LINE OF THUNDERSTORMS HAD MOVED OUT OF MINNESOTA AND INTO WEST WISCONSIN. WITH A FRONTAL BOUNDARY STILL PRESENT OVER SOUTHERN MINNESOTA JUST SOUTH OF THE TWIN CITIES...THUNDERSTORMS COULD REDEVELOP LATER THIS AFTERNOON. PERSONS SHOULD REMAIN ALERT TO LATER FORECASTS AND STATEMENTS FROM THE NATIONAL WEATHER SERVICE DURING THE AFTERNOON. JHM
Special weather statement, Jul 20, 2:53 PM CDT, 5 hours 16 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 250 PM CDT MON JUL 20 1987 AT 235 PM CDT...INTENSE THUNDERSTORMS CONTINUED OVER WEST CENTRAL WISCONSIN FROM 35 MILES SOUTHEAST OF EAU CLAIRE NEAR FAIRCHILD TO 40 MILES SOUTHWEST OF EAU CLAIRE NEAR MONDOVI. VERY HEAVY RAINS..STRONG GUSTY WINDS AND DANGEROUS LIGHTNING CAN BE EXPECTED WITH THESE STORMS AS THEY MOVE SOUTH AT 45 MILES AN HOUR. THE STORMS SHOULD BE LOCATED ALONG A LINE FROM NEAR BLACK RIVER FALLS TO 25 MILES NORTH OF LA CROSSE BY 315 PM CDT. THESE STORMS WERE PART OF AN AREA OF SHOWERS AND THUNDERSTORMS THAT EXTENDED FROM 25 MILES EAST OF HAYWARD TO 25 MILES WEST OF WAUSAU TO# SOUTH OF EAU CLAIRE. STANDFIELD JHM
Special weather statement, Jul 20, 3:47 PM CDT, 4 hours 22 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 345 PM CDT MON JUL 20 1987 ....SEVERE THUNDERSTORM WATCH UNTIL 9 PM CDT FOR PARTS OF WEST CENTRAL WISCONSIN.... AT 330 PM CDT...STRONG THUNDERSTORMS CONTINUED OVER WEST CENTRAL WISCONSIN 35 MILES NORTHEAST OF LA CROSSE JUST NORTH AND WEST OF BLACK RIVER FALLS. THE STORMS WERE MOVING SOUTH AT 40 MILES AN HOUR AND SHOULD BE LOCATED JUST NORTHEAST OF LA CROSSE TO NORTH OF TOMAH BY 415 PM CDT. VERY HEAVY RAINS...STRONG GUSTY WINDS AND DANGEROUS LIGHTNING CAN BE EXPECTED WITH THE STORMS. ELSEWHERE..SHOWERS AND THUNDERSTORMS HAD DEVELOPED OVER WEST CENTRAL MINNESOTA FROM THE MINNESOTA/SOUTHI DAKOTA BORDER NEAR BIG STONE LAKE TO WEST OF ALEXANDRIA TO 35 MILES SOUTH OF DETROIT LAKES. MOVEMENT WAS NORTHEAST AT 45 MILES AN HOUR. STANDFIELD
Special weather statement, Jul 20, 6:21 PM CDT, 1 hour 48 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
615 PM CDT MON JUL 20 1987
..THUNDERSTORMS TO AFFECT THE LAKE MINNETONKA AREA..
A STRONG THUNDERSTORM HAS BEEN DEVELOPING RAPIDLY OVER WESTERN HENNEPIN
COUNTY IN THE MOUND AND INDEPENDENCE AREA. THIS THUNDERSTORM WAS SLOWLY
MOVING TO THE EAST SOUTHEAST AND IT WILL MOVE ACROSS PARTS OF LAKE
MINNETONKA THROUGH 700 PM.
SOME LIGHTNING..GUSTY WINDS AND HEAVY RAINS ARE POSSIBLE WITH THIS STORM.
PERSONS BOATING OR FISHING ON LAKE MINNETONKA SHOULD MAKE PLANS NOW TO
HEAD FOR SAFE HARBOR UNTIL THE THUNDERSTORMS PASS BY THE LAKE.
AT 615 PM CDT..OTHER THUNDERSTORMS WERE FORMING OVER SCOTT..WESTERN ANOKA
AND WRIGHT COUNTIES OF THE WESTERN METROPOLITAN AREA.
THEY WERE MOVING EAST AT ABOUT 20 MILES AN HOUR.
SWANBERGSpecial weather statement, Jul 20, 8:04 PM CDT, 5 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
800 PM CDT MON JUL 20 1987
..INTENSE THUNDERSTORMS ACROSS SOUTHERN AND CENTRAL MINNESOTA AND
NORTHWEST WISCONSIN..
AT 800 PM CDT..THE STRONGEST THUNDERSTORMS WERE OCCURRING IN AND AROUND
THE TWIN CITIES AREA WITH HAIL..HIGH WINDS AND VERY HEAVY RAINS.
SMALL HAIL..WINDS GUSTING TO 50 MPH AND TORRENTIAL RAINS CAN BE EXPECTED
ACROSS THE METROPOLITAN AREA rUNTIL AT LEAST 930 PM.
STREET FLOODING CAN ALSO BE EXPECTED.
SWANBERG
SWANBERGThe office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 7:06 PM CDT | Tornado Warning | MPX | Dakota | 24 min |
| Jul 20, 7:13 PM CDT | Tornado Warning | MPX | Anoka, Hennepin, Ramsey | 27 min |
| Jul 20, 7:14 PM CDT | Severe Thunderstorm Warning | MPX | Meeker | 61 min |
| Jul 20, 8:00 PM CDT | Severe Thunderstorm Warning | MPX | Lac qui Parle | 60 min |
| Jul 20, 9:34 PM CDT | Severe Thunderstorm Warning | MPX | Hennepin, Scott | 56 min |
| Jul 20, 9:45 PM CDT | Severe Thunderstorm Warning | MPX | Kandiyohi, Meeker | 60 min |
| Jul 20, 10:36 PM CDT | Severe Thunderstorm Warning | MPX | Carver, Hennepin | 54 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.