Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 42, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 11, 1987, 7:19 AM CDT for Anoka County, Isanti County, Minnesota. It was in force for 56 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 11, 1987, 7:19 AM CDT (12:19 UTC)
- Expired
- Jul 11, 1987, 8:15 AM CDT
- In force
- 56 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
Counties Anoka County, MN, Isanti 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 11, 7:30 AM CDT | Thunderstorm Wind 0 | Isanti, 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 12:00Z, 0.3 hours before the alert went out and 68 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
- 2637 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 638 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMSP 111219 SVRMSP MNC053-003-059-141-111315- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MINNEAPOLIS MN 719 AM CDT SAT JUL 11 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 815 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF EAST CENTRAL MINNESOTA... NORTHERN HENNEPIN...ANOKA...SOUTHERN ISANTI AND SHERBURNE AT 710 AM CDT REPORTS NEAR BUFFALO IN WRIGHT COUNTY OF EAST CENTRAL MINNESOTA INDICATED STRONG WINDS CAUSING LOTS OF TREE DAMAGE AND WIDESPREAD POWER OUTAGES IN NORTHERN WRIGHT COUNTY. RADAR CONTINUED TO INDICATE SEVERE THUNDERSTORMS EXITING WRIGHT COUNTY AND ENTERING SHEREBURNE..NRN HENNEPIN AND ANOKA COUNTIES. LARGE HAIL VERY HEAVY RAINS CAUSING MINOR URBAN FLOODING AND WIND GUSTS IN EXCESS OF 55 MILES AN HOUR. CITIES IN THE PATH OF THESE THUNDERSTORMS ELK RIVER..ANOKA..BETHEL AND BROOKLYN PARK. MOVEMENTOF THESE SEVERE THUNDERSTORMS WAS TO THE EAST NORTHEAST AT 35 MILES AN HOUR. 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 SAFETY IF ONE IS SPOTTED. DOMBROWSKY
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 11, 1:27 AM CDT, 5 hours 52 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST. CLOUD MN 120 AM CDT SAT JULY 11 1987 ...THUNDERSTORMS WERE MOVING TOWARD MILLE LACS LAKE... AT 115 AM CDT RADAR SHOWED A LINE OF THUNDERSTORMS MOVING TOWARD MILLE LACS LAKE AT 30 MPH AND WILL BE AFFECTING THE LAKE AREA FROM 120 AM TO 300 AM. NO SEVERE WEATHER HAS BEEN REPORTED AT THIS TIME OR IS INDICATED ON RADAR. HOWEVER THESE THUNDERSTORMS MAY PRODUCE GUSTY WIND$S AND FREQUENT LIGHTNING STRIKES...BOATERS...FISHERPERSONS...AND OTHERS ENGAGED IN OUTDOOR ACTIVITIES IN THE AFFECTED AREA SHOULD TAKE NECESSARY PRECAUTIONS. NISTLER
Special weather statement, Jul 11, 1:37 AM CDT, 5 hours 42 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 130 AM CDT SAT JUL 11 1987 AT 130 AM...THUNDERSTORMS WITH VERY HEAVY RAIN WERE OCCURRING OVER SECTIONS OF CENTRAL...EAST CENTRAL...AND WEST CENTRAL MINNESOTA. THEY WERE LOCATED IN A 75 MILE WIDE AREA FROM GRAND RAPIDS TO ALEXANDRIA. THE STRONGEST THUNDERSTORMS WERE IN THE AITKIN...HILL CITY AREA OF CENTRAL MINNESOTA. THEY MAY PRODUCE HAIL...STRONG GUSTY WINDS...FREQUENT LIGHTNING AND VERY HEAVY RAINFALL. PERSONS ENGAGED IN OUTDOOR ACTIVITIES SUCH AS FISHING OR CAMPING SHOULD TAKE APPROPRIATE SAFTEY PRECAUTIONS. THUNDERSTORMS DEVELOPED RAPIDLY SINCE 1230 AM OVER THE SOUTHWEST SECTIONS OF THE GREAT,ER TWIN CITIES METROPOLITAN AREA OF EAST CENTRAL MINNESOTA. MOVEMENT WAS TO THE EAST AT 35 MILES AN HOUR. KRAFT
Special weather statement, Jul 11, 5:35 AM CDT, 1 hour 44 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 535 AM CDT SAT JUL 11 1987 ...SEVERE THUNDERSTORM WRNING FOR COTTONWOOD AND JACKSON COUNTIES OF SOUTHWEST MINNESOTA UNTIL 615 AM CDT THIS SATURDAY MORNING..... AT 515 AM VERY HEAVY THUNDERSTORMS WERE APPROACHING THE MINNESOTA RIVER BETWEEN GRANITE FALLS AND REDWOOD FALLS ALONG THE REDWOOD AND RENVILLE COUNTY LINE IN SOUTHWEST MINNESOTA. THESE THUNDERSTORMS WERE PRODUCING HEAVY RAINS..SMALL HAIL AND GUSTY WINDS TO 40 MPH. NO SEVERE WEATHER HAD AS YET BEEN REPORTED WITH THESE THUNDERSTORMS BUT TO THE SOUTH HEAVIER THUNDERSTORMS WERE MOVING OUT OF MURRAY AND NOBLES COUNTIES INTO COTTONWOOD AND JACKSON COUNTIES OF SOUTHWEST MINNESOTA. THESE THUNDER- STORMS WERE INDICATED AS SEVERE AND WARNINGS HAVE BEEN ISSUED FOR PORTIONS OF THESE COUNTIES UNTIL 615 AM CDT THIS SATURDAY MORNING FOR LARGE HAIL AND STRONG SURFACE WINDS. ADDITIONAL SHOWERS AND THUNDERSTORMS WERE ALSO INDICATED OVER PORTIONS OF CENTRAL MINNESOTA AND NORTHWEST WISCONSIN. SCATTERED LIGHT RAINSHOWRS WERE LOCATED BETWEEN PRINCETON AND LAKE MILLE LACS IN CENTRAL MINNESOTA AND SCATTERED HEAVY THUNDERSTORMS WERE LOCATED BET5WEEN SPOONER AND HAYWARD IN NORTHWEST WISCONSIN. MOVEMENT OF THESE SHOWER AND THUNDERSTORM AREAS WAS TO THE EAST NORTHEAST AT 25 TO 30 MILES AN HOUR. DOMBROWSKY
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 10:00 PM CDT | Severe Thunderstorm Warning | MPX | Todd | 60 min |
| Jul 10, 10:20 PM CDT | Tornado Warning | MPX | Todd | 25 min |
| Jul 11, 12:16 AM CDT | Severe Thunderstorm Warning | MPX | Carver, Scott, Sibley | 44 min |
| Jul 11, 3:20 AM CDT | Severe Thunderstorm Warning | MPX | Lac qui Parle, Yellow Medicine | 60 min |
| Jul 11, 4:20 AM CDT | Severe Thunderstorm Warning | MPX | Yellow Medicine | 60 min |
| Jul 11, 5:50 AM CDT | Severe Thunderstorm Warning | MPX | Kandiyohi | 60 min |
| Jul 11, 6:15 AM CDT | Severe Thunderstorm Warning | MPX | Meeker | 60 min |
| Jul 11, 6:45 AM CDT | Severe Thunderstorm Warning | MPX | Wright | 45 min |
| Jul 11, 7:11 AM CDT | Severe Thunderstorm Warning | MPX | Watonwan | 49 min |
| Jul 11, 7:19 AM CDT | Severe Thunderstorm Warning | MPX | Hennepin, Sherburne | 21 min |
| Jul 11, 7:42 AM CDT | Severe Thunderstorm Warning | MPX | Blue Earth | 48 min |
| Jul 11, 7:52 AM CDT | Severe Thunderstorm Warning | MPX | Washington | 28 min |
| Jul 11, 7:52 AM CDT | Severe Thunderstorm Warning | MPX | Chisago | 38 min |
| Jul 11, 4:47 PM CDT | Severe Thunderstorm Warning | MPX | Faribault, Freeborn | 53 min |
| Jul 11, 4:47 PM CDT | Severe Thunderstorm Warning | MPX | Martin | 53 min |
| Jul 11, 5:31 PM CDT | Severe Thunderstorm Warning | MPX | Dodge, Freeborn, Steele | 44 min |
| Jul 11, 5:48 PM CDT | Severe Thunderstorm Warning | MPX | Wabasha, Winona | 42 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.