Alert archive / Michigan / Flash Flood Warnings in 1986

Flash Flood Warning 1, NWS Marquette, MI

July 18, 1986Alger County, Delta County, Marquette County, Michigan

NWS Marquette, MI issued this flash flood warning at Jul 18, 1986, 3:45 PM EDT for Alger County, Delta County, Marquette County, Michigan. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Jul 18, 1986, 3:45 PM EDT (19:45 UTC)
Expired
Jul 18, 1986, 10:00 PM EDT
In force
6 hr
Issued by
NWS Marquette, MI
Area
Whole counties

Counties Alger County, MI, Delta County, MI, Marquette 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

Sault Ste Marie, MI (KSSM), launched 12:00Z, 7.8 hours before the alert went out and 208 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, Sault Ste Marie, MI at 12:00Z on 1986-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 412 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Sault Ste Marie, MI at 12:00Z on 1986-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
412 J/kg
Mixed-layer CIN
-262 J/kg
Mixed-layer LCL
562 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
211 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this flash flood 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 18, 12:38 PM EDT, 3 hours 7 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MARQUETTE MI
1235 PM EDT FRI JUL 18 1986

AT 1229 PM EDT A 10 MILE WIDE LINE OF THUNDERSTORMS WAS FROM
JUST SOUTH OF PALMER TO EAST OF TRENARY TO WHITEFISH BAY IN UPPER
MICHIGAN.

THIS LINE OF THUNDERSTORMS WAS MOVING TO THE SOUTHEAST AT 40 MILES
AN HOUR AND WILL BE ACCOMPANIED BY GUSTY WINDS..HEAVY RAINS AND
POSSIBLE SMALL HAIL

PERSONS IN SOUTHERN MARQUETTE..SOUTHERN ALGER..NORTHERN DELTA..
AND THE SOUTH HALF OF SCHOOLCRAFT COUNTIES SHOULD BE ON THE ALERT FOR
THREATENING WEATHER AND PASS ANY SEVERE WEATHER REPORTS TO
THE NEAREST LAW ENFORCENMENT AGENCY.

BM

The office that day

Everything else NWS Marquette, MI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 18, 1:05 PM EDTSevere Thunderstorm WarningMQTAlger, Delta, Marquette55 min
Jul 18, 1:05 PM EDTSevere Thunderstorm WarningMQTSchoolcraft55 min
Jul 18, 2:05 PM EDTSevere Thunderstorm WarningMQTDelta, Marquette55 min
Jul 18, 2:59 PM EDTSevere Thunderstorm WarningMQTDelta, Marquette61 min
Jul 18, 4:04 PM EDTSevere Thunderstorm WarningMQTDelta, Menominee56 min
Jul 18, 4:59 PM EDTSevere Thunderstorm WarningMQTDickinson, Menominee61 min

Nearby

Flash Flood Warnings in Michigan, 1986Every flash flood warning in 1986

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.