Alert archive / Minnesota / Tornado Warnings in 1999

Tornado Warning 36, NWS Grand Forks, ND

July 25, 1999Mahnomen County, Minnesota

NWS Grand Forks, ND issued this tornado warning at Jul 25, 1999, 1:52 PM CDT for Mahnomen County, Minnesota. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 25, 1999, 1:52 PM CDT (18:52 UTC)
Expired
Jul 25, 1999, 2:25 PM CDT
In force
33 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Mahnomen County, MN

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 25, 11:00 AM CDTTornado WatchSPC5 hr

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 6.9 hours before the alert went out and 233 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.

Skew-T log-pSkew-T log-p diagram, International Fa, MN at 12:00Z on 1999-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, International Fa, MN at 12:00Z on 1999-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2231 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
144 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KFAR 251853
TORFAR
MNC087-251925-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
152 PM CDT SUN JUL 25 1999

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN MAHNOMEN COUNTY IN NORTHWESTERN MINNESOTA

* UNTIL 225 PM CDT

* AT 145 PM CDT NATIONAL WEATHER SERVICE INDICATED A TORNADO 25 MILES
  NORTH OF DETROIT LAKES OR 14 MILES WEST OF NAYTAHWAUSH MOVING
  NORTHEAFST AT 30 MPH.

* THE TORNADO WILL BE NEAR...
  WAUBAN AT 155 PM CDT

THIS IS A DANGEROUS STORM.  IF YOU ARE IN THE PATH OF A TORNADO
ABANDON CAR AND MOBILE HOMES FOR A STURDY BUILDING.

TURNER/ANDERSON


&

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.

NWS Grand Forks, ND wrote its last area forecast discussion before this tornado warning went out at Jul 25, 10:25 AM CDT, 3 hours 27 minutes earlier.

Area forecast discussion, Jul 25, 10:25 AM CDT, 3 hours 27 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1025 AM CDT SUN JUL 25 1999

...FORECAST CHALLANGE SEVERE WEATHER THREAT...

ATM IS CAPPED ATTM.  PULSE TYPE TSTMS ARE OCCURRING ALG SFC CDFNT WHICH
IS MOVG INTO RRV LATE THIS MORNING.  ISOLD TSTM PRODUCED LARGE HAIL NR
GFK AT 15Z. CAPES NEAR 5000 J/KG ARE ANTICPATED THIS AFTN ACRS MUCH OF
THE ERN HALF OF THE CWFA BASED ON MODIFIED SOUNDINGS. BEST MSTR
CONVERGENGE AND INSTABILITY IS EXPECTED TO BE LOCATED ACRS SERN ND AND
WCNTRL MN FROM 21Z TO 01Z. BLV ONLY ISOLD SVR TSTMS TIL LATER THIS AFTN
WHEN CAP IS BROKEN.  MESO ETA FCST OF FNTL POSITION IS VERY GOOD BASED
ON 15Z OBS. WILL CONT USING ITS FNTL FCST THRU 03Z. CURRENT HAZARDOUS
WEATHER OUTLOOK STILL HAS EXPECTED LOCATION AND TIMING ON TARGET SO
WILL NOT UPDATE ATTM. MAY WAIT TIL 18Z TO PIN-POINT MORE A SPECIFIC
AREA.  ZONES ARE ALREADY UPDATED.  MENTIONED 100-105 HEAT INDEX FOR
DTL-FFM AREA IN SPS.  DO NOT ANTICIPATE AN ADVISORY ATTM.

.FGF...NONE.
 BELLES

In the hours before

Special weather statement, Jul 25, 8:36 AM CDT, 5 hours 16 minutes before
MNZ027-028-030>032-040-252035-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
836 AM CDT SUN JUL 25 1999

...EXPECT VERY WARM TEMPERATURES AND HUMIDITY TODAY...

TEMPERATURES IN THE LOWER 90S ALONG WITH HIGH HUMIDITY WILL RAISE
THE HEAT INDEX INTO THE LOWER 100S THIS AFTERNOON.  WITH THIS TYPE
OF EXTREME HEAT...CAUTION IS ADVISED.  CITIES AFFECTED BY THIS
EXTREME HEAT INCLUDE FERGUS FALLS...ELBOW LAKE...WADENA...AND
DETROIT LAKES.

AVOID HEAT STROKE.  DRINK PLENTY OF FLUIDS AND TAKE FREQUENT BREAKS
IF YOU ARE OUTDOORS.

 BELLES
Special weather statement, Jul 25, 9:42 AM CDT, 4 hours 10 minutes before
MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052-053-251510-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
942 AM CDT SUN JUL 25 1999

...SEVERE THUNDERSTORM WATCH CANCELLED...

SEVERE THUNDERSTORM WATCH NUMBER 535 FOR NORTHEAST NORTH DAKOTA AND
NORTHWEST MINNESOTA HAS BEEN CANCELLED. HOWEVER...THUNDERSTORMS ARE
STILL EXPECTED ACROSS THE REGION THROUGH THE DAY. PLEASE CONTINUE
TfO MONITOR YOUR LOCAL RADIO AND TELEVISION STATIONS OR NOAA WEATHER
RADIO FOR THE LATEST INFORMATION CONCERNING THUNDERSTORMS THAT MAY
MOVE INTO YOUR AREA.

KENNEDY
Local storm report, Jul 25, 10:29 AM CDT, 3 hours 23 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
1029 AM CDT SUN JUL 25 1999

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1000 AM    3SE INKSTER               ND   .75 INCH HAIL
07/25/99   GRAND FORKS
Special weather statement, Jul 25, 1:48 PM CDT, 4 minutes before
MNZ001-004-005-007-008-013-NDZ027-029-030-038-251945-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
148 PM CDT SUN JUL 25 1999

...THE TORNADO WATCH HAS BEEN CANCELLED FOR A PORTION OF
NORTHEASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA...

TORNADO WATCH 586 IS NO LONGER IN EFFECT FOR THE FOLLOWING COUNTIES
IN NORTH DAKOTA...

GRAND FORKS...TRAILL...BARNES...STEELE

AND IS NO LONGER IN EFFECT IN NORTHWEST MINNESOTA 8FOR...

PENNINGTON...KITTSON...MARSHALL...WESTERN POLK...ROSEAU

BELLES

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 25, 10:37 AM CDTSevere Thunderstorm WarningFGFMarshall33 min
Jul 25, 11:31 AM CDTSevere Thunderstorm WarningFGFMarshall29 min
Jul 25, 11:52 AM CDTSevere Thunderstorm WarningFGFRoseau33 min
Jul 25, 11:59 AM CDTSevere Thunderstorm WarningFGFMarshall36 min
Jul 25, 12:26 PM CDTSevere Thunderstorm WarningFGFPennington34 min
Jul 25, 12:32 PM CDTSevere Thunderstorm WarningFGFMarshall33 min
Jul 25, 12:44 PM CDTSevere Thunderstorm WarningFGFPolk36 min
Jul 25, 1:09 PM CDTTornado WarningFGFClay36 min
Jul 25, 1:18 PM CDTSevere Thunderstorm WarningFGFBecker, Mahnomen, Norman32 min
Jul 25, 1:59 PM CDTSevere Thunderstorm WarningFGFClay36 min
Jul 25, 2:11 PM CDTSevere Thunderstorm WarningFGFBecker34 min
Jul 25, 2:41 PM CDTTornado WarningFGFBecker34 min
Jul 25, 2:54 PM CDTSevere Thunderstorm WarningFGFBeltrami36 min
Jul 25, 3:11 PM CDTSevere Thunderstorm WarningFGFClearwater34 min

Nearby

Tornado Warnings in Minnesota, 1999Every tornado warning in 1999Tornadoes in 1999

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.